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Bunch of liblzma API cleanups and fixes.

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This commit is contained in:
Lasse Collin 2008-12-15 19:39:13 +02:00
parent 17781c2c20
commit 671a5adf1e
27 changed files with 870 additions and 433 deletions
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64
src/liblzma/api/lzma.h
View file

@ -30,7 +30,8 @@
* liblzma API headers need some standard types and macros. To allow
* including lzma.h without requiring the application to include other
* headers first, lzma.h includes the required standard headers unless
* they already seem to be included.
* they already seem to be included already or if LZMA_MANUAL_HEADERS
* has been defined.
*
* Here's what types and macros are needed and from which headers:
* - stddef.h: size_t, NULL
@ -42,10 +43,12 @@
*
* The hacks below aren't perfect, specifically they assume that inttypes.h
* exists and that it typedefs at least uint8_t, uint32_t, and uint64_t,
* and that unsigned int is 32-bit. If your application already takes care
* of setting up all the types properly (for example by using gnulib's
* stdint.h or inttypes.h), feel free to define LZMA_MANUAL_HEADERS before
* including lzma.h.
* and that, in case of incomplete inttypes.h, unsigned int is 32-bit.
* If the application already takes care of setting up all the types and
* macros properly (for example by using gnulib's stdint.h or inttypes.h),
* we try to detect that the macros are already defined and don't include
* inttypes.h here again. However, you may define LZMA_MANUAL_HEADERS to
* force this file to never include any system headers.
*
* Some could argue that liblzma API should provide all the required types,
* for example lzma_uint64, LZMA_UINT64_C(n), and LZMA_UINT64_MAX. This was
@ -53,22 +56,33 @@
* types and macros in the standard headers.
*
* Note that liblzma API still has lzma_bool, because using stdbool.h would
* break C89 and C++ programs on many systems.
* break C89 and C++ programs on many systems. sizeof(bool) in C99 isn't
* necessarily the same as sizeof(bool) in C++.
*/
/* stddef.h even in C++ so that we get size_t in global namespace. */
#include <stddef.h>
#ifndef LZMA_MANUAL_HEADERS
/*
* I suppose this works portably also in C++. Note that in C++,
* we need to get size_t into the global namespace.
*/
#include <stddef.h>
#if !defined(UINT32_C) || !defined(UINT64_C) \
/*
* Skip inttypes.h if we already have all the required macros. If we
* have the macros, we assume that we have the matching typedefs too.
*/
# if !defined(UINT32_C) || !defined(UINT64_C) \
|| !defined(UINT32_MAX) || !defined(UINT64_MAX)
# ifdef __cplusplus
/*
* C99 sections 7.18.2 and 7.18.4 specify that in C++
* implementations define the limit and constant macros only
* if specifically requested. Note that if you want the
* format macros too, you need to define __STDC_FORMAT_MACROS
* before including lzma.h, since re-including inttypes.h
* with __STDC_FORMAT_MACROS defined doesn't necessarily work.
* implementations define the limit and constant
* macros only if specifically requested. Note that
* if you want the format macros (PRIu64 etc.) too,
* you need to define __STDC_FORMAT_MACROS before
* including lzma.h, since re-including inttypes.h
* with __STDC_FORMAT_MACROS defined doesn't
* necessarily work.
*/
# ifndef __STDC_LIMIT_MACROS
# define __STDC_LIMIT_MACROS 1
@ -81,11 +95,12 @@
# include <inttypes.h>
/*
* Some old systems have only the typedefs in inttypes.h, and lack
* all the macros. For those systems, we need a few more hacks.
* We assume that unsigned int is 32-bit and unsigned long is either
* 32-bit or 64-bit. If these hacks aren't enough, the application
* has to use setup the types manually before including lzma.h.
* Some old systems have only the typedefs in inttypes.h, and
* lack all the macros. For those systems, we need a few more
* hacks. We assume that unsigned int is 32-bit and unsigned
* long is either 32-bit or 64-bit. If these hacks aren't
* enough, the application has to setup the types manually
* before including lzma.h.
*/
# ifndef UINT32_C
# define UINT32_C(n) n # U
@ -93,11 +108,7 @@
# ifndef UINT64_C
/* Get ULONG_MAX. */
# ifndef __cplusplus
# include <limits.h>
# else
# include <climits>
# endif
# if ULONG_MAX == 4294967295UL
# define UINT64_C(n) n ## ULL
# else
@ -112,7 +123,8 @@
# ifndef UINT64_MAX
# define UINT64_MAX (UINT64_C(18446744073709551615))
# endif
#endif
# endif
#endif /* ifdef LZMA_MANUAL_HEADERS */
/******************
@ -152,8 +164,6 @@
# define lzma_restrict
# endif
# endif
# define lzma_attr_warn_unused_result
#endif
@ -204,10 +214,10 @@ extern "C" {
/* Advanced features */
#include "lzma/alignment.h" /* FIXME */
#include "lzma/stream_flags.h"
#include "lzma/block.h"
#include "lzma/index.h"
#include "lzma/index_hash.h"
#include "lzma/stream_flags.h"
/*
* All subheaders included. Undefine LZMA_H_INTERNAL to prevent applications

174
src/liblzma/api/lzma/base.h
View file

@ -95,23 +95,23 @@ typedef enum {
/**<
* \brief Cannot calculate the integrity check
*
* The usage of this return value is slightly different in
* encoders and decoders.
* The usage of this return value is different in encoders
* and decoders.
*
* Encoders can return this value only from the initialization
* function. If initialization fails with this value, the
* encoding cannot be done, because there's no way to produce
* output with the correct integrity check.
*
* Decoders can return this value only from the lzma_code
* function and only if the LZMA_TELL_UNSUPPORTED_CHECK flag
* was used when initializing the decoder. The decoding can
* still be continued normally even if the check type is
* unsupported, but naturally the check will not be validated,
* and possible errors may go undetected.
* Decoders can return this value only from lzma_code() and
* only if the LZMA_TELL_UNSUPPORTED_CHECK flag was used when
* initializing the decoder. The decoding can still be
* continued normally even if the check type is unsupported,
* but naturally the check will not be validated, and possible
* errors may go undetected.
*
* With decoder, it is possible to call lzma_get_check()
* immediatelly after lzma_code has returned
* immediatelly after lzma_code() has returned
* LZMA_UNSUPPORTED_CHECK. This way it is possible to find
* out what the unsupported Check ID was.
*/
@ -136,8 +136,9 @@ typedef enum {
* Memory allocation failed, or the size of the allocation
* would be greater than SIZE_MAX.
*
* Due to lazy coding, the coding cannot be continued even
* if more memory were made available after LZMA_MEM_ERROR.
* Due to internal implementation reasons, the coding cannot
* be continued even if more memory were made available after
* LZMA_MEM_ERROR.
*/
LZMA_MEMLIMIT_ERROR = 6,
@ -146,19 +147,18 @@ typedef enum {
*
* Decoder would need more memory than allowed by the
* specified memory usage limit. To continue decoding,
* the memory usage limit has to be increased. See functions
* lzma_memlimit_get() and lzma_memlimit_set().
* the memory usage limit has to be increased with
* lzma_memlimit().
*/
LZMA_FORMAT_ERROR = 7,
/**<
* \brief Unknown file format
* \brief File format not recognized
*
* The decoder did not recognize the input as supported file
* format. This error can occur, for example, when trying to
* decode LZMA_Alone format file with lzma_stream_decoder,
* because lzma_stream_decoder accepts only the new .lzma
* format.
* decode .lzma format file with lzma_stream_decoder,
* because lzma_stream_decoder accepts only the .xz format.
*/
LZMA_OPTIONS_ERROR = 8,
@ -185,7 +185,7 @@ typedef enum {
* format would be exceeded. These limits are huge, thus
* getting this error from an encoder is mostly theoretical.
* For example, the maximum compressed and uncompressed
* size of a Stream created with lzma_stream_encoder is
* size of a .xz Stream created with lzma_stream_encoder is
* 2^63 - 1 bytes (one byte less than 8 EiB).
*
* Decoders return this error if the input data is corrupt.
@ -209,7 +209,7 @@ typedef enum {
* Typically the first call to lzma_code() that can do no
* progress returns LZMA_OK instead of LZMA_BUF_ERROR. Only
* the second consecutive call doing no progress will return
* LZMA_BUF_ERROR. This is by design.
* LZMA_BUF_ERROR. This is intentional.
*
* With zlib, Z_BUF_ERROR may be returned even if the
* application is doing nothing wrong. The above hack
@ -263,10 +263,7 @@ typedef enum {
* lzma_code() call.
*
* Decoder: Decode as much input as possible and produce as
* much output as possible. This action provides best
* throughput, but may introduce latency, because the
* decoder may decode more data into its internal buffers
* than that fits into next_out.
* much output as possible.
*/
LZMA_SYNC_FLUSH = 1,
@ -297,30 +294,22 @@ typedef enum {
/**<
* \brief Make all the input available at output
*
* This is like LZMA_SYNC_FLUSH except that this resets the
* internal encoder state.
*
*
*
* Finishes encoding of the current Data Block. All the input
* data going to the current Data Block must have been given
* Finish encoding of the current Block. All the input
* data going to the current Block must have been given
* to the encoder (the last bytes can still be pending in
* next_in). Call lzma_code() with LZMA_FULL_FLUSH until
* it returns LZMA_STREAM_END. Then continue normally with
* LZMA_RUN or finish the Stream with LZMA_FINISH.
*
* This action is supported only by Stream encoder and easy
* encoder (which uses Stream encoder). If there is no
* unfinished Block, no empty Block is created.
* This action is currently supported only by Stream encoder
* and easy encoder (which uses Stream encoder). If there is
* no unfinished Block, no empty Block is created.
*/
LZMA_FINISH = 3
/**<
* \brief Finish the coding operation
*
*
*
*
* Finishes the coding operation. All the input data must
* have been given to the encoder (the last bytes can still
* be pending in next_in). Call lzma_code() with LZMA_FINISH
@ -341,8 +330,8 @@ typedef enum {
* \brief Custom functions for memory handling
*
* A pointer to lzma_allocator may be passed via lzma_stream structure
* to liblzma, and some advanced function take pointer lzma_allocator as
* a separate function argument. The library will use the functions
* to liblzma, and some advanced functions take a pointer to lzma_allocator
* as a separate function argument. The library will use the functions
* specified in lzma_allocator for memory handling instead of the default
* malloc() and free().
*
@ -354,31 +343,32 @@ typedef enum {
*/
typedef struct {
/**
* \brief Pointer to custom memory allocation function
* \brief Pointer to a custom memory allocation function
*
* If you don't want a custom allocator, but still want
* custom free(), set this to NULL and liblzma will use
* the standard malloc().
*
* \param opaque lzma_allocator.opaque (see below)
* \param nmemb Number of elements like in calloc().
* liblzma will always set nmemb to 1.
* This argument exists only for
* \param nmemb Number of elements like in calloc(). liblzma
* will always set nmemb to 1, so it is safe to
* ignore nmemb in a custom allocator if you like.
* The nmemb argument exists only for
* compatibility with zlib and libbzip2.
* \param size Size of an element in bytes.
* liblzma never sets this to zero.
*
* \return Pointer to the beginning of a memory block of
* size nmemb * size, or NULL if allocation fails
* `size' bytes, or NULL if allocation fails
* for some reason. When allocation fails, functions
* of liblzma return LZMA_MEM_ERROR.
*
* For performance reasons, the allocator should not waste time
* zeroing the allocated buffers. This is not only about speed, but
* also memory usage, since the operating system kernel doesn't
* necessarily allocate the requested memory until it is actually
* used. With small input files liblzma may actually need only a
* fraction of the memory that it requested for allocation.
* necessarily allocate the requested memory in physical memory until
* it is actually used. With small input files liblzma may actually
* need only a fraction of the memory that it requested for allocation.
*
* \note LZMA_MEM_ERROR is also used when the size of the
* allocation would be greater than SIZE_MAX. Thus,
@ -389,7 +379,7 @@ typedef struct {
void *(*alloc)(void *opaque, size_t nmemb, size_t size);
/**
* \brief Pointer to custom memory freeing function
* \brief Pointer to a custom memory freeing function
*
* If you don't want a custom freeing function, but still
* want a custom allocator, set this to NULL and liblzma
@ -432,17 +422,22 @@ typedef struct lzma_internal_s lzma_internal;
* - defining custom memory hander functions; and
* - holding a pointer to coder-specific internal data structures.
*
* The typical usage
* Typical usage:
*
* - After allocating lzma_stream (on stack or with malloc()), it must be
* initialized to LZMA_STREAM_INIT (see LZMA_STREAM_INIT for details).
*
* - Initialize a coder to the lzma_stream, for example by using
* lzma_easy_encoder() or lzma_auto_decoder(). In contrast to zlib,
* strm->next_in and strm->next_out are ignored by all initialization
* functions, thus it is safe to not initialize them yet. The
* initialization functions always set strm->total_in and strm->total_out
* to zero.
* lzma_easy_encoder() or lzma_auto_decoder(). Some notes:
* - In contrast to zlib, strm->next_in and strm->next_out are
* ignored by all initialization functions, thus it is safe
* to not initialize them yet.
* - The initialization functions always set strm->total_in and
* strm->total_out to zero.
* - If the initialization function fails, no memory is left allocated
* that would require freeing with lzma_end() even if some memory was
* associated with the lzma_stream structure when the initialization
* function was called.
*
* - Use lzma_code() to do the actual work.
*
@ -451,11 +446,12 @@ typedef struct lzma_internal_s lzma_internal;
* function without calling lzma_end() first. Old allocations are
* automatically freed.
*
* - Finally, use lzma_end() to free the allocated memory.
* - Finally, use lzma_end() to free the allocated memory. lzma_end() never
* frees the lzma_stream structure itself.
*
* Application may modify values of total_in and total_out as it wants.
* Application may modify the values of total_in and total_out as it wants.
* They are updated by liblzma to match the amount of data read and
* written, but liblzma doesn't use the values internally.
* written, but aren't used for anything else.
*/
typedef struct {
const uint8_t *next_in; /**< Pointer to the next input byte. */
@ -475,7 +471,7 @@ typedef struct {
/** Internal state is not visible to applications. */
lzma_internal *internal;
/**
/*
* Reserved space to allow possible future extensions without
* breaking the ABI. Excluding the initialization of this structure,
* you should not touch these, because the names of these variables
@ -510,11 +506,12 @@ typedef struct {
* *strm = tmp;
*/
#define LZMA_STREAM_INIT \
{ NULL, 0, 0, NULL, 0, 0, NULL, NULL, NULL, NULL, 0, 0, 0, 0 }
{ NULL, 0, 0, NULL, 0, 0, NULL, NULL, \
NULL, NULL, 0, 0, LZMA_RESERVED_ENUM, LZMA_RESERVED_ENUM }
/**
* \brief Encodes or decodes data
* \brief Encode or decode data
*
* Once the lzma_stream has been successfully initialized (e.g. with
* lzma_stream_encoder()), the actual encoding or decoding is done
@ -531,13 +528,68 @@ extern lzma_ret lzma_code(lzma_stream *strm, lzma_action action)
/**
* \brief Frees memory allocated for the coder data structures
* \brief Free memory allocated for the coder data structures
*
* \param strm Pointer to lzma_stream that is at least initialized
* with LZMA_STREAM_INIT.
*
* After lzma_end(strm), strm->internal is guaranteed to be NULL. No other
* members of the lzma_stream structure are touched.
*
* \note zlib indicates an error if application end()s unfinished
* stream. liblzma doesn't do this, and assumes that
* stream structure. liblzma doesn't do this, and assumes that
* application knows what it is doing.
*/
extern void lzma_end(lzma_stream *strm);
/**
* \brief Get the memory usage of decoder filter chain
*
* This function is currently supported only when *strm has been initialized
* with a function that takes a memlimit argument. With other functions, you
* should use e.g. lzma_raw_encoder_memusage() or lzma_raw_decoder_memusage()
* to estimate the memory requirements.
*
* This function is useful e.g. after LZMA_MEMLIMIT_ERROR to find out how big
* the memory usage limit should have been to decode the input. Note that
* this may give misleading information if decoding .xz Streams that have
* multiple Blocks, because each Block can have different memory requirements.
*
* \return Rough estimate of how much memory is currently allocated
* for the filter decoders. If no filter chain is currently
* allocated, some non-zero value is still returned, which is
* less than or equal to what any filter chain would indicate
* as its memory requirement.
*
* If this function isn't supported by *strm or some other error
* occurs, zero is returned.
*/
extern uint64_t lzma_memusage(const lzma_stream *strm);
/**
* \brief Get the current memory usage limit
*
* This function is supported only when *strm has been initialized with
* a function that takes a memlimit argument.
*
* \return On success, the current memory usage limit is returned
* (always non-zero). On error, zero is returned.
*/
extern uint64_t lzma_memlimit_get(const lzma_stream *strm);
/**
* \brief Set the memory usage limit
*
* This function is supported only when *strm has been initialized with
* a function that takes a memlimit argument.
*
* \return - LZMA_OK: New memory usage limit successfully set.
* - LZMA_MEMLIMIT_ERROR: The new limit is too small.
* The limit was not changed.
* - LZMA_PROG_ERROR: Invalid arguments, e.g. *strm doesn't
* support memory usage limit or memlimit was zero.
*/
extern lzma_ret lzma_memlimit_set(lzma_stream *strm, uint64_t memlimit);

211
src/liblzma/api/lzma/block.h
View file

@ -22,10 +22,10 @@
/**
* \brief Options for the Block Header encoder and decoder
* \brief Options for the Block and Block Header encoders and decoders
*
* Different things use different parts of this structure. Some read
* some members, other functions write, and some do both. Only the
* Different Block handling functions use different parts of this structure.
* Some read some members, other functions write, and some do both. Only the
* members listed for reading need to be initialized when the specified
* functions are called. The members marked for writing will be assigned
* new values at some point either by calling the given function or by
@ -33,11 +33,16 @@
*/
typedef struct {
/**
* \brief Size of the Block Header
* \brief Size of the Block Header field
*
* This is always a multiple of four.
*
* Read by:
* - lzma_block_header_encode()
* - lzma_block_header_decode()
* - lzma_block_compressed_size()
* - lzma_block_unpadded_size()
* - lzma_block_total_size()
* - lzma_block_decoder()
*
* Written by:
@ -50,12 +55,15 @@ typedef struct {
/**
* \brief Type of integrity Check
*
* The type of the integrity Check is not stored into the Block
* Header, thus its value must be provided also when decoding.
* The Check ID is not stored into the Block Header, thus its value
* must be provided also when decoding.
*
* Read by:
* - lzma_block_header_encode()
* - lzma_block_header_decode()
* - lzma_block_compressed_size()
* - lzma_block_unpadded_size()
* - lzma_block_total_size()
* - lzma_block_encoder()
* - lzma_block_decoder()
*/
@ -64,19 +72,50 @@ typedef struct {
/**
* \brief Size of the Compressed Data in bytes
*
* Usually you don't know this value when encoding in streamed mode.
* In non-streamed mode you can reserve space for this field when
* encoding the Block Header the first time, and then re-encode the
* Block Header and copy it over the original one after the encoding
* of the Block has been finished.
* Encoding: If this is not LZMA_VLI_UNKNOWN, Block Header encoder
* will store this value to the Block Header. Block encoder doesn't
* care about this value, but will set it once the encoding has been
* finished.
*
* Decoding: If this is not LZMA_VLI_UNKNOWN, Block decoder will
* verify that the size of the Compressed Data field matches
* compressed_size.
*
* Usually you don't know this value when encoding in streamed mode,
* and thus cannot write this field into the Block Header.
*
* In non-streamed mode you can reserve space for this field before
* encoding the actual Block. After encoding the data, finish the
* Block by encoding the Block Header. Steps in detail:
*
* - Set compressed_size to some big enough value. If you don't know
* better, use LZMA_VLI_MAX, but remember that bigger values take
* more space in Block Header.
*
* - Call lzma_block_header_size() to see how much space you need to
* reserve for the Block Header.
*
* - Encode the Block using lzma_block_encoder() and lzma_code().
* It sets compressed_size to the correct value.
*
* - Use lzma_block_header_encode() to encode the Block Header.
* Because space was reserved in the first step, you don't need
* to call lzma_block_header_size() anymore, because due to
* reserving, header_size has to be big enough. If it is "too big",
* lzma_block_header_encode() will add enough Header Padding to
* make Block Header to match the size specified by header_size.
*
* Read by:
* - lzma_block_header_size()
* - lzma_block_header_encode()
* - lzma_block_compressed_size()
* - lzma_block_unpadded_size()
* - lzma_block_total_size()
* - lzma_block_decoder()
*
* Written by:
* - lzma_block_header_decode()
* - lzma_block_compressed_size()
* - lzma_block_encoder()
* - lzma_block_decoder()
*/
@ -85,18 +124,11 @@ typedef struct {
/**
* \brief Uncompressed Size in bytes
*
* Encoder: If this value is not LZMA_VLI_UNKNOWN, it is stored
* to the Uncompressed Size field in the Block Header. The real
* uncompressed size of the data being compressed must match
* the Uncompressed Size or LZMA_OPTIONS_ERROR is returned.
* This is handled very similarly to compressed_size above.
*
* If Uncompressed Size is unknown, End of Payload Marker must
* be used. If uncompressed_size == LZMA_VLI_UNKNOWN and
* has_eopm == 0, LZMA_OPTIONS_ERROR will be returned.
*
* Decoder: If this value is not LZMA_VLI_UNKNOWN, it is
* compared to the real Uncompressed Size. If they do not match,
* LZMA_OPTIONS_ERROR is returned.
* Unlike compressed_size, uncompressed_size is needed by fewer
* functions. This is because uncompressed_size isn't needed to
* validate that Block stays within proper limits.
*
* Read by:
* - lzma_block_header_size()
@ -140,7 +172,7 @@ typedef struct {
/**
* \brief Decodes the Block Header Size field
* \brief Decode the Block Header Size field
*
* To decode Block Header using lzma_block_header_decode(), the size of the
* Block Header has to be known and stored into lzma_block.header_size.
@ -154,100 +186,130 @@ typedef struct {
/**
* \brief Calculates the size of Block Header
* \brief Calculate Block Header Size
*
* Calculate the minimum size needed for the Block Header field using the
* settings specified in the lzma_block structure. Note that it is OK to
* increase the calculated header_size value as long as it is a multiple of
* four and doesn't exceed LZMA_BLOCK_HEADER_SIZE_MAX. Increasing header_size
* just means that lzma_block_header_encode() will add Header Padding.
*
* \return - LZMA_OK: Size calculated successfully and stored to
* options->header_size.
* block->header_size.
* - LZMA_OPTIONS_ERROR: Unsupported filters or filter options.
* - LZMA_PROG_ERROR: Invalid options
* - LZMA_PROG_ERROR: Invalid values like compressed_size == 0.
*
* \note This doesn't check that all the options are valid i.e. this
* may return LZMA_OK even if lzma_block_header_encode() or
* lzma_block_encoder() would fail.
* lzma_block_encoder() would fail. If you want to validate the
* filter chain, consider using lzma_memlimit_encoder() which as
* a side-effect validates the filter chain.
*/
extern lzma_ret lzma_block_header_size(lzma_block *options)
extern lzma_ret lzma_block_header_size(lzma_block *block)
lzma_attr_warn_unused_result;
/**
* \brief Encodes Block Header
* \brief Encode Block Header
*
* Encoding of the Block options is done with a single call instead of
* first initializing and then doing the actual work with lzma_code().
* The caller must have calculated the size of the Block Header already with
* lzma_block_header_size(). If larger value than the one calculated by
* lzma_block_header_size() is used, the Block Header will be padded to the
* specified size.
*
* \param out Beginning of the output buffer. This must be
* at least options->header_size bytes.
* \param options Block options to be encoded.
* at least block->header_size bytes.
* \param block Block options to be encoded.
*
* \return - LZMA_OK: Encoding was successful. options->header_size
* \return - LZMA_OK: Encoding was successful. block->header_size
* bytes were written to output buffer.
* - LZMA_OPTIONS_ERROR: Invalid or unsupported options.
* - LZMA_PROG_ERROR
* - LZMA_PROG_ERROR: Invalid arguments, for example
* block->header_size is invalid or block->filters is NULL.
*/
extern lzma_ret lzma_block_header_encode(
const lzma_block *options, uint8_t *out)
extern lzma_ret lzma_block_header_encode(const lzma_block *block, uint8_t *out)
lzma_attr_warn_unused_result;
/**
* \brief Decodes Block Header
* \brief Decode Block Header
*
* Decoding of the Block options is done with a single call instead of
* first initializing and then doing the actual work with lzma_code().
* The size of the Block Header must have already been decoded with
* lzma_block_header_size_decode() macro and stored to block->header_size.
* block->filters must have been allocated, but not necessarily initialized.
* Possible existing filter options are _not_ freed.
*
* \param options Destination for block options
* \param block Destination for block options with header_size
* properly initialized.
* \param allocator lzma_allocator for custom allocator functions.
* Set to NULL to use malloc().
* Set to NULL to use malloc() (and also free()
* if an error occurs).
* \param in Beginning of the input buffer. This must be
* at least options->header_size bytes.
* at least block->header_size bytes.
*
* \return - LZMA_OK: Decoding was successful. options->header_size
* bytes were written to output buffer.
* - LZMA_OPTIONS_ERROR: Invalid or unsupported options.
* - LZMA_PROG_ERROR
* \return - LZMA_OK: Decoding was successful. block->header_size
* bytes were read from the input buffer.
* - LZMA_OPTIONS_ERROR: The Block Header specifies some
* unsupported options such as unsupported filters.
* - LZMA_DATA_ERROR: Block Header is corrupt, for example,
* the CRC32 doesn't match.
* - LZMA_PROG_ERROR: Invalid arguments, for example
* block->header_size is invalid or block->filters is NULL.
*/
extern lzma_ret lzma_block_header_decode(lzma_block *options,
extern lzma_ret lzma_block_header_decode(lzma_block *block,
lzma_allocator *allocator, const uint8_t *in)
lzma_attr_warn_unused_result;
/**
* \brief Sets Compressed Size according to Unpadded Size
* \brief Validate and set Compressed Size according to Unpadded Size
*
* Block Header stores Compressed Size, but Index has Unpadded Size. If the
* application has already parsed the Index and is now decoding Blocks,
* it can calculate Compressed Size from Unpadded Size. This function does
* exactly that with error checking, so application doesn't need to check,
* for example, if the value in Index is too small to contain even the
* Block Header. Note that you need to call this function _after_ decoding
* the Block Header field.
* exactly that with error checking:
*
* \return - LZMA_OK: options->compressed_size was set successfully.
* - Compressed Size calculated from Unpadded Size must be positive integer,
* that is, Unpadded Size must be big enough that after Block Header and
* Check fields there's still at least one byte for Compressed Size.
*
* - If Compressed Size was present in Block Header, the new value
* calculated from Unpadded Size is compared against the value
* from Block Header.
*
* \note This function must be called _after_ decoding the Block Header
* field so that it can properly validate Compressed Size if it
* was present in Block Header.
*
* \return - LZMA_OK: block->compressed_size was set successfully.
* - LZMA_DATA_ERROR: unpadded_size is too small compared to
* options->header_size and lzma_check_sizes[options->check].
* block->header_size and lzma_check_size(block->check).
* - LZMA_PROG_ERROR: Some values are invalid. For example,
* options->header_size must be a multiple of four, and
* options->header_size between 8 and 1024 inclusive.
* block->header_size must be a multiple of four and
* between 8 and 1024 inclusive.
*/
extern lzma_ret lzma_block_compressed_size(
lzma_block *options, lzma_vli unpadded_size)
lzma_block *block, lzma_vli unpadded_size)
lzma_attr_warn_unused_result;
/**
* \brief Calculates Unpadded Size
* \brief Calculate Unpadded Size
*
* This function can be useful after decoding a Block to get Unpadded Size
* that is stored in Index.
* The Index field stores Unpadded Size and Uncompressed Size. The latter
* can be taken directly from the lzma_block structure after coding a Block,
* but Unpadded Size needs to be calculated from Block Header Size,
* Compressed Size, and size of the Check field. This is where this function
* is needed.
*
* \return Unpadded Size on success, or zero on error.
*/
extern lzma_vli lzma_block_unpadded_size(const lzma_block *options)
extern lzma_vli lzma_block_unpadded_size(const lzma_block *block)
lzma_attr_pure;
/**
* \brief Calculates the total encoded size of a Block
* \brief Calculate the total encoded size of a Block
*
* This is equivalent to lzma_block_unpadded_size() except that the returned
* value includes the size of the Block Padding field.
@ -255,39 +317,40 @@ extern lzma_vli lzma_block_unpadded_size(const lzma_block *options)
* \return On success, total encoded size of the Block. On error,
* zero is returned.
*/
extern lzma_vli lzma_block_total_size(const lzma_block *options)
extern lzma_vli lzma_block_total_size(const lzma_block *block)
lzma_attr_pure;
/**
* \brief Initializes .lzma Block encoder
* \brief Initialize .xz Block encoder
*
* This function is required for multi-thread encoding. It may also be
* useful when implementing custom file formats.
* Valid actions for lzma_code() are LZMA_RUN, LZMA_SYNC_FLUSH (only if the
* filter chain supports it), and LZMA_FINISH.
*
* \return - LZMA_OK: All good, continue with lzma_code().
* - LZMA_MEM_ERROR
* - LZMA_OPTIONS_ERROR
* - LZMA_UNSUPPORTED_CHECK: options->check specfies a Check
* - LZMA_UNSUPPORTED_CHECK: block->check specfies a Check ID
* that is not supported by this buid of liblzma. Initializing
* the encoder failed.
* - LZMA_PROG_ERROR
*
* lzma_code() can return FIXME
*/
extern lzma_ret lzma_block_encoder(lzma_stream *strm, lzma_block *options)
extern lzma_ret lzma_block_encoder(lzma_stream *strm, lzma_block *block)
lzma_attr_warn_unused_result;
/**
* \brief Initializes decoder for .lzma Block
* \brief Initialize .xz Block decoder
*
* Valid actions for lzma_code() are LZMA_RUN and LZMA_FINISH. Using
* LZMA_FINISH is not required. It is supported only for convenience.
*
* \return - LZMA_OK: All good, continue with lzma_code().
* - LZMA_UNSUPPORTED_CHECK: Initialization was successful, but
* the given Check type is not supported, thus Check will be
* the given Check ID is not supported, thus Check will be
* ignored.
* - LZMA_PROG_ERROR
* - LZMA_MEM_ERROR
*/
extern lzma_ret lzma_block_decoder(lzma_stream *strm, lzma_block *options)
extern lzma_ret lzma_block_decoder(lzma_stream *strm, lzma_block *block)
lzma_attr_warn_unused_result;

28
src/liblzma/api/lzma/check.h
View file

@ -22,11 +22,11 @@
/**
* \brief Type of the Check
* \brief Type of the integrity check (Check ID)
*
* The .lzma format supports multiple types of Checks that are calculated
* from the uncompressed data (unless it is empty; then it's calculated
* from Block Header).
* The .xz format supports multiple types of checks that are calculated
* from the uncompressed data. They very in both speed and ability to
* detect errors.
*/
typedef enum {
LZMA_CHECK_NONE = 0,
@ -62,11 +62,11 @@ typedef enum {
/**
* \brief Maximum valid Check ID
*
* The .lzma file format specification specifies eight Check IDs (0-15). Some
* The .xz file format specification specifies 16 Check IDs (0-15). Some
* of them are only reserved i.e. no actual Check algorithm has been assigned.
* Still liblzma accepts any of these eight IDs for future compatibility
* when decoding files. If a valid but unsupported Check ID is detected,
* liblzma indicates a warning with LZMA_UNSUPPORTED_CHECK.
* Still liblzma accepts any of these IDs for future compatibility when
* decoding files. If a valid but unsupported Check ID is detected, liblzma
* indicates a warning with LZMA_UNSUPPORTED_CHECK.
*
* FIXME bad desc
*/
@ -85,18 +85,20 @@ typedef enum {
* Returns true if the given Check ID is supported by this liblzma build.
* Otherwise false is returned. It is safe to call this with a value that
* is not in the range [0, 15]; in that case the return value is always false.
*
* You can assume that LZMA_CHECK_NONE and LZMA_CHECK_CRC32 are always
* supported (even if liblzma is built with limited features).
*/
extern lzma_bool lzma_check_is_supported(lzma_check check)
lzma_attr_const;
/**
* \brief Get the size of the Check field with given Check ID
* \brief Get the size of the Check field with the given Check ID
*
* Although not all Check IDs have a check algorithm associated, the size of
* every Check is already frozen. This function returns the size (in bytes) of
* the Check field with the specified Check ID. The values are taken from the
* section 2.1.1.2 of the .lzma file format specification:
* the Check field with the specified Check ID. The values are:
* { 0, 4, 4, 4, 8, 8, 8, 16, 16, 16, 32, 32, 32, 64, 64, 64 }
*
* If the argument is not in the range [0, 15], UINT32_MAX is returned.
@ -134,8 +136,8 @@ extern uint64_t lzma_crc64(const uint8_t *buf, size_t size, uint64_t crc)
/*
* SHA256 functions are currently not exported to public API.
* Contact the author if you think it should be.
* SHA-256 functions are currently not exported to public API.
* Contact Lasse Collin if you think it should be.
*/

161
src/liblzma/api/lzma/container.h
View file

@ -26,90 +26,78 @@
************/
/**
* \brief Compression level names for lzma_easy_* functions
* \brief Default compression level for easy encoder
*
* At the moment, all the compression levels support LZMA_SYNC_FLUSH.
* In future there may be levels that don't support LZMA_SYNC_FLUSH.
* However, the LZMA_SYNC_FLUSH support won't be removed from the
* existing compression levels.
*
* \note If liblzma is built without encoder support, or with some
* filters disabled, some of the compression levels may be
* unsupported. In that case, the initialization functions
* will return LZMA_OPTIONS_ERROR.
* It's not straightforward to recommend a default level, because in some
* cases keeping the resource usage relatively low is more important that
* getting the maximum compression ratio.
*/
typedef enum {
LZMA_EASY_COPY = 0,
/**<
* No compression; the data is just wrapped into .lzma
* container.
#define LZMA_EASY_LEVEL_DEFAULT 6
/*
* Flags for easy encoder
*
* Currently only one flag is defined.
*/
LZMA_EASY_LZMA2_1 = 1,
/**<
* LZMA2 filter with fast compression (fast in terms of LZMA2).
* If you are interested in the exact options used, see
* lzma_lzma_preset(1). Note that the exact options may
* change between liblzma versions.
/**
* Use significantly slower compression to get marginally better compression
* ratio. This doesn't affect the memory requirements of the encoder or
* decoder. This flag is useful when you don't mind wasting time to get as
* small result as possible.
*
* At the moment, the command line tool uses these settings
* when `lzma -1' is used. In future, the command line tool
* may default to some more complex way to determine the
* settings used e.g. the type of files being compressed.
*
* LZMA_EASY_LZMA2_2 is equivalent to lzma_lzma_preset(2)
* and so on.
* FIXME: Not implemented yet.
*/
LZMA_EASY_LZMA2_2 = 2,
LZMA_EASY_LZMA2_3 = 3,
LZMA_EASY_LZMA2_4 = 4,
LZMA_EASY_LZMA2_5 = 5,
LZMA_EASY_LZMA2_6 = 6,
LZMA_EASY_LZMA2_7 = 7,
LZMA_EASY_LZMA2_8 = 8,
LZMA_EASY_LZMA2_9 = 9,
} lzma_easy_level;
#define LZMA_EASY_EXTREME UINT32_C(0x01)
/**
* \brief Default compression level
* \brief Calculate rough memory usage of easy encoder
*
* Data Blocks contain the actual compressed data. It's not straightforward
* to recommend a default level, because in some cases keeping the resource
* usage relatively low is more important that getting the maximum
* compression ratio.
* This function is a wrapper for lzma_raw_encoder_memusage().
*
* \param level Compression level
* \param flags Easy encoder flags (usually zero). This parameter is
* needed, because in future some flags may affect the
* memory requirements.
*/
#define LZMA_EASY_DEFAULT LZMA_EASY_LZMA2_7
/**
* \brief Calculates rough memory requirements of a compression level
*
* This function is a wrapper for lzma_memory_usage(), which is declared
* in filter.h.
*
* \return Approximate memory usage of the encoder with the given
* compression level in mebibytes (value * 1024 * 1024 bytes).
* On error (e.g. compression level is not supported),
* UINT32_MAX is returned.
*/
extern uint64_t lzma_easy_memory_usage(lzma_easy_level level)
extern uint64_t lzma_easy_encoder_memusage(uint32_t level, uint32_t flags)
lzma_attr_pure;
/**
* \brief Initializes .lzma Stream encoder
* \brief Calculate rough memory usage FIXME
*
* This function is a wrapper for lzma_raw_decoder_memusage().
*
* \param level Compression level
* \param flags Easy encoder flags (usually zero). This parameter is
* needed, because in future some flags may affect the
* memory requirements.
*/
extern uint64_t lzma_easy_decoder_memusage(uint32_t level, uint32_t flags)
lzma_attr_pure;
/**
* \brief Initialize .xz Stream encoder using a preset number
*
* This function is intended for those who just want to use the basic features
* if liblzma (that is, most developers out there). Lots of assumptions are
* made, which are correct or at least good enough for most situations.
* if liblzma (that is, most developers out there).
*
* \param strm Pointer to lzma_stream that is at least initialized
* with LZMA_STREAM_INIT.
* \param level Compression level to use. This selects a set of
* compression settings from a list of compression
* presets.
* presets. Currently levels from 1 to 9 are defined,
* which match the options -1 .. -9 of the xz command
* line tool.
* \param flags Flags that can finetune the compression preset.
* In most cases, no flags are wanted, and this
* parameter is zero.
* \param check Integrity check type to use. See check.h for available
* checks. If you are unsure, use LZMA_CHECK_CRC32.
*
* \return - LZMA_OK: Initialization succeeded. Use lzma_code() to
* encode your data.
@ -117,18 +105,23 @@ extern uint64_t lzma_easy_memory_usage(lzma_easy_level level)
* previously allocated for *strm is now freed.
* - LZMA_OPTIONS_ERROR: The given compression level is not
* supported by this build of liblzma.
* - LZMA_UNSUPPORTED_CHECK: The given check type is not
* supported by this liblzma build.
* - LZMA_PROG_ERROR: One or more of the parameters have values
* that will never be valid. For example, strm == NULL.
*
* If initialization succeeds, use lzma_code() to do the actual encoding.
* Valid values for `action' (the second argument of lzma_code()) are
* LZMA_RUN, LZMA_SYNC_FLUSH, LZMA_FULL_FLUSH, and LZMA_FINISH. In future,
* there may be compression levels that don't support LZMA_SYNC_FLUSH.
* there may be compression levels or flags that don't support LZMA_SYNC_FLUSH.
*/
extern lzma_ret lzma_easy_encoder(lzma_stream *strm, lzma_easy_level level)
extern lzma_ret lzma_easy_encoder(lzma_stream *strm,
uint32_t level, uint32_t flags, lzma_check check)
lzma_attr_warn_unused_result;
/**
* \brief Initializes .lzma Stream encoder
* \brief Initialize .xz Stream encoder using a custom filter chain
*
* \param strm Pointer to properly prepared lzma_stream
* \param filters Array of filters. This must be terminated with
@ -150,19 +143,25 @@ extern lzma_ret lzma_stream_encoder(lzma_stream *strm,
/**
* \brief Initializes LZMA_Alone (deprecated file format) encoder
* \brief Initialize .lzma encoder (legacy file format)
*
* LZMA_Alone files have the suffix .lzma like the .lzma Stream files.
* LZMA_Alone format supports only one filter, the LZMA filter. There is
* no support for integrity checks like CRC32.
* The .lzma format is sometimes called the LZMA_Alone format, which is the
* reason for the name of this function. The .lzma format supports only the
* LZMA1 filter. There is no support for integrity checks like CRC32.
*
* Use this format if and only if you need to create files readable by
* legacy LZMA tools such as LZMA Utils 4.32.x.
* Use this function if and only if you need to create files readable by
* legacy LZMA tools such as LZMA Utils 4.32.x. Moving to the .xz format
* is strongly recommended.
*
* LZMA_Alone encoder doesn't support LZMA_SYNC_FLUSH or LZMA_FULL_FLUSH.
* FIXME: Dictionary size limit?
*
* The valid action values for lzma_code() are LZMA_RUN and LZMA_FINISH.
* No kind of flushing is supported, because the file format doesn't make
* it possible.
*
* \return - LZMA_OK
* - LZMA_MEM_ERROR
* - LZMA_OPTIONS_ERROR // FIXME
* - LZMA_PROG_ERROR
*/
extern lzma_ret lzma_alone_encoder(
@ -177,7 +176,7 @@ extern lzma_ret lzma_alone_encoder(
/**
* This flag makes lzma_code() return LZMA_NO_CHECK if the input stream
* being decoded has no integrity check. Note that when used with
* lzma_auto_decoder(), all LZMA_Alone files will trigger LZMA_NO_CHECK
* lzma_auto_decoder(), all .lzma files will trigger LZMA_NO_CHECK
* if LZMA_TELL_NO_CHECK is used.
*/
#define LZMA_TELL_NO_CHECK UINT32_C(0x01)
@ -203,8 +202,8 @@ extern lzma_ret lzma_alone_encoder(
/**
* This flag enables decoding of concatenated files with file formats that
* allow concatenating compressed files as is. From the formats currently
* supported by liblzma, only the new .lzma format allows concatenated files.
* Concatenated files are not allowed with the LZMA_Alone format.
* supported by liblzma, only the .xz format allows concatenated files.
* Concatenated files are not allowed with the legacy .lzma format.
*
* This flag also affects the usage of the `action' argument for lzma_code().
* When LZMA_CONCATENATED is used, lzma_code() won't return LZMA_STREAM_END
@ -218,7 +217,7 @@ extern lzma_ret lzma_alone_encoder(
/**
* \brief Initializes decoder for .lzma Stream
* \brief Initialize .xz Stream decoder
*
* \param strm Pointer to properly prepared lzma_stream
* \param memlimit Rough memory usage limit as bytes
@ -233,13 +232,13 @@ extern lzma_ret lzma_stream_decoder(
/**
* \brief Decode .lzma Streams and LZMA_Alone files with autodetection
* \brief Decode .xz Streams and .lzma files with autodetection
*
* Autodetects between the .lzma Stream and LZMA_Alone formats, and
* This decoder autodetects between the .xz and .lzma file formats, and
* calls lzma_stream_decoder() or lzma_alone_decoder() once the type
* of the file has been detected.
* of the input file has been detected.
*
* \param strm Pointer to propertily prepared lzma_stream
* \param strm Pointer to properly prepared lzma_stream
* \param memlimit Rough memory usage limit as bytes
* \param flags Bitwise-or of flags, or zero for no flags.
*
@ -253,7 +252,7 @@ extern lzma_ret lzma_auto_decoder(
/**
* \brief Initializes decoder for LZMA_Alone file
* \brief Initializes decoder for .lzma file
*
* Valid `action' arguments to lzma_code() are LZMA_RUN and LZMA_FINISH.
* There is no need to use LZMA_FINISH, but allowing it may simplify

12
src/liblzma/api/lzma/delta.h
View file

@ -64,12 +64,12 @@ typedef struct {
# define LZMA_DELTA_DIST_MIN 1
# define LZMA_DELTA_DIST_MAX 256
/**
* \brief Reserved space for possible future extensions
*
* You should not touch these, because the names of these variables
* may change. These are and will never be used when type is
* LZMA_DELTA_TYPE_BYTE, so it is safe to leave these uninitialized.
/*
* Reserved space to allow possible future extensions without
* breaking the ABI. You should not touch these, because the names
* of these variables may change. These are and will never be used
* when type is LZMA_DELTA_TYPE_BYTE, so it is safe to leave these
* uninitialized.
*/
uint32_t reserved_int1;
uint32_t reserved_int2;

27
src/liblzma/api/lzma/filter.h
View file

@ -21,11 +21,28 @@
#endif
/**
* \brief Maximum number of filters in a chain
*
* A filter chain can have 1-4 filters, of which three are allowed to change
* the size of the data. Usually only one or two filters are needed.
*/
#define LZMA_FILTERS_MAX 4
/**
* \brief Filter options
*
* This structure is used to pass Filter ID and a pointer filter's options
* to liblzma.
* to liblzma. An array of lzma_filter structures is used to define a filter
* chain.
*
* A filter chain is indicated with an array of lzma_filter structures.
* The array is terminated with .id = LZMA_VLI_UNKNOWN. Thus, the filter array
* must have LZMA_FILTERS_MAX + 1 elements (that is, five) to be able to hold
* any arbitrary filter chain. This is important when using
* lzma_block_header_decode() from block.h, because too small array would
* make liblzma write past the end of the filters array.
*/
typedef struct {
/**
@ -54,14 +71,6 @@ typedef struct {
} lzma_filter;
/**
* \brief Maximum number of filters in a chain
*
* FIXME desc
*/
#define LZMA_FILTERS_MAX 4
/**
* \brief Test if the given Filter ID is supported for encoding
*

97
src/liblzma/api/lzma/index.h
View file

@ -1,6 +1,6 @@
/**
* \file lzma/index.h
* \brief Handling of Index lists
* \brief Handling of .xz Index lists
*
* \author Copyright (C) 1999-2006 Igor Pavlov
* \author Copyright (C) 2007 Lasse Collin
@ -68,6 +68,25 @@ typedef struct {
} lzma_index_record;
/**
* \brief Calculate memory usage for Index with given number of Records
*
* On disk, the size of the Index field depends on both the number of Records
* stored and how big values the Records store (due to variable-length integer
* encoding). When the Index is kept in lzma_index structure, the memory usage
* depends only on the number of Records stored in the Index. The size in RAM
* is almost always a lot bigger than in encoded form on disk.
*
* This function calculates an approximate amount of memory needed hold the
* given number of Records in lzma_index structure. This value may vary
* between liblzma versions if the internal implementation is modified.
*
* If you want to know how much memory an existing lzma_index structure is
* using, use lzma_index_memusage(lzma_index_count(i)).
*/
extern uint64_t lzma_index_memusage(lzma_vli record_count);
/**
* \brief Allocate and initialize a new lzma_index structure
*
@ -76,7 +95,7 @@ typedef struct {
*
* If i is non-NULL, it is reinitialized and the same pointer returned.
* In this case, return value cannot be NULL or a different pointer than
* the i given as argument.
* the i that was given as an argument.
*/
extern lzma_index *lzma_index_init(lzma_index *i, lzma_allocator *allocator)
lzma_attr_warn_unused_result;
@ -84,6 +103,8 @@ extern lzma_index *lzma_index_init(lzma_index *i, lzma_allocator *allocator)
/**
* \brief Deallocate the Index
*
* If i is NULL, this does nothing.
*/
extern void lzma_index_end(lzma_index *i, lzma_allocator *allocator);
@ -91,14 +112,20 @@ extern void lzma_index_end(lzma_index *i, lzma_allocator *allocator);
/**
* \brief Add a new Record to an Index
*
* \param index Pointer to a lzma_index structure
* \param unpadded_size Unpadded Size of a Block
* \param uncompressed_size Uncompressed Size of a Block, or
* LZMA_VLI_UNKNOWN to indicate padding.
* \param i Pointer to a lzma_index structure
* \param allocator Pointer to lzma_allocator, or NULL to
* use malloc()
* \param unpadded_size Unpadded Size of a Block. This can be
* calculated with lzma_block_unpadded_size()
* after encoding or decoding the Block.
* \param uncompressed_size Uncompressed Size of a Block. This can be
* taken directly from lzma_block structure
* after encoding or decoding the Block.
*
* Appending a new Record does not affect the read position.
*
* \return - LZMA_OK
* - LZMA_MEM_ERROR
* - LZMA_DATA_ERROR: Compressed or uncompressed size of the
* Stream or size of the Index field would grow too big.
* - LZMA_PROG_ERROR
@ -117,7 +144,7 @@ extern lzma_vli lzma_index_count(const lzma_index *i) lzma_attr_pure;
/**
* \brief Get the size of the Index field as bytes
*
* This is needed to verify the Index Size field from the Stream Footer.
* This is needed to verify the Backward Size field in the Stream Footer.
*/
extern lzma_vli lzma_index_size(const lzma_index *i) lzma_attr_pure;
@ -145,7 +172,8 @@ extern lzma_vli lzma_index_stream_size(const lzma_index *i) lzma_attr_pure;
*
* When no Indexes have been combined with lzma_index_cat(), this function is
* identical to lzma_index_stream_size(). If multiple Indexes have been
* combined, this includes also the possible Stream Padding fields.
* combined, this includes also the headers of each separate Stream and the
* possible Stream Padding fields.
*/
extern lzma_vli lzma_index_file_size(const lzma_index *i) lzma_attr_pure;
@ -181,7 +209,8 @@ extern void lzma_index_rewind(lzma_index *i);
*
* \param i Pointer to lzma_index structure
* \param record Pointer to a structure to hold the search results
* \param target Uncompressed target offset
* \param target Uncompressed target offset which the caller would
* like to locate from the Stream
*
* If the target is smaller than the uncompressed size of the Stream (can be
* checked with lzma_index_uncompressed_size()):
@ -204,13 +233,15 @@ extern lzma_bool lzma_index_locate(
*
*
*
* \param dest Destination Index after which src is appended Source
* \param src Index. The memory allocated for this is either moved
* to be part of *dest or freed iff the function call
* succeeds, and src will be an invalid pointer.
* \param dest Destination Index after which src is appended
* \param src Source Index. The memory allocated for this is
* either moved to be part of *dest or freed if and
* only if the function call succeeds, and src will
* be an invalid pointer.
* \param allocator Custom memory allocator; can be NULL to use
* malloc() and free().
* \param padding Size of the Stream Padding field between Streams.
* This must be a multiple of four.
*
* \return - LZMA_OK: Indexes concatenated successfully.
* - LZMA_DATA_ERROR: *dest would grow too big.
@ -226,6 +257,8 @@ extern lzma_ret lzma_index_cat(lzma_index *lzma_restrict dest,
/**
* \brief Duplicates an Index list
*
* Makes an identical copy of the Index. Also the read position is copied.
*
* \return A copy of the Index, or NULL if memory allocation failed.
*/
extern lzma_index *lzma_index_dup(
@ -235,6 +268,8 @@ extern lzma_index *lzma_index_dup(
/**
* \brief Compares if two Index lists are identical
*
* \return True if *a and *b are equal, false otherwise.
*/
extern lzma_bool lzma_index_equal(const lzma_index *a, const lzma_index *b)
lzma_attr_pure;
@ -242,6 +277,17 @@ extern lzma_bool lzma_index_equal(const lzma_index *a, const lzma_index *b)
/**
* \brief Initializes Index encoder
*
* \param strm Pointer to properly prepared lzma_stream
* \param i Pointer to lzma_index which should be encoded.
* The read position will be at the end of the Index
* after lzma_code() has returned LZMA_STREAM_END.
*
* The only valid action value for lzma_code() is LZMA_RUN.
*
* \return - LZMA_OK: Initialization succeeded, continue with lzma_code().
* - LZMA_MEM_ERROR
* - LZMA_PROG_ERROR
*/
extern lzma_ret lzma_index_encoder(lzma_stream *strm, lzma_index *i)
lzma_attr_warn_unused_result;
@ -249,6 +295,29 @@ extern lzma_ret lzma_index_encoder(lzma_stream *strm, lzma_index *i)
/**
* \brief Initializes Index decoder
*
* \param strm Pointer to properly prepared lzma_stream
* \param i Pointer to a pointer that will be made to point
* to the final decoded Index once lzma_code() has
* returned LZMA_STREAM_END. That is,
* lzma_index_decoder() takes care of allocating
* a new lzma_index structure.
* \param memlimit How much memory the resulting Index is allowed
* to require.
*
* The only valid action value for lzma_code() is LZMA_RUN.
*
* \return - LZMA_OK: Initialization succeeded, continue with lzma_code().
* - LZMA_MEM_ERROR
* - LZMA_MEMLIMIT_ERROR
* - LZMA_PROG_ERROR
*
* \note The memory usage limit is checked early in the decoding
* (within the first dozen input bytes or so). The actual memory
* is allocated later in smaller pieces. If the memory usage
* limit is modified after decoding a part of the Index already,
* the new limit may be ignored.
*/
extern lzma_ret lzma_index_decoder(lzma_stream *strm, lzma_index **i)
extern lzma_ret lzma_index_decoder(
lzma_stream *strm, lzma_index **i, uint64_t memlimit)
lzma_attr_warn_unused_result;

26
src/liblzma/api/lzma/index_hash.h
View file

@ -39,7 +39,7 @@ typedef struct lzma_index_hash_s lzma_index_hash;
*
* If index_hash is non-NULL, it is reinitialized and the same pointer
* returned. In this case, return value cannot be NULL or a different
* pointer than the index_hash given as argument.
* pointer than the index_hash that was given as an argument.
*/
extern lzma_index_hash *lzma_index_hash_init(
lzma_index_hash *index_hash, lzma_allocator *allocator)
@ -47,7 +47,7 @@ extern lzma_index_hash *lzma_index_hash_init(
/**
* \brief Deallocate the Index hash
* \brief Deallocate lzma_index_hash structure
*/
extern void lzma_index_hash_end(
lzma_index_hash *index_hash, lzma_allocator *allocator);
@ -72,17 +72,29 @@ extern lzma_ret lzma_index_hash_append(lzma_index_hash *index_hash,
/**
* \brief Decode the Index field
* \brief Decode and validate the Index field
*
* After telling the sizes of all Blocks with lzma_index_hash_append(),
* the actual Index field is decoded with this function. Specifically,
* once decoding of the Index field has been started, no more Records
* can be added using lzma_index_hash_append().
*
* This function doesn't use lzma_stream structure to pass the input data.
* Instead, the input buffer is specified using three arguments. This is
* because it matches better the internal APIs of liblzma.
*
* \param index_hash Pointer to a lzma_index_hash structure
* \param in Pointer to the beginning of the input buffer
* \param in_pos in[*in_pos] is the next byte to process
* \param in_size in[in_size] is the first byte not to process
*
* \return - LZMA_OK: So far good, but more input is needed.
* - LZMA_STREAM_END: Index decoded successfully and it matches
* the Records given with lzma_index_hash_append().
* - LZMA_DATA_ERROR: Index is corrupt or doesn't match the
* information given with lzma_index_hash_append().
* - LZMA_BUF_ERROR: Cannot progress because *in_pos >= in_size.
* - LZMA_PROG_ERROR
*
* \note Once decoding of the Index field has been started, no more
* Records can be added using lzma_index_hash_append().
*/
extern lzma_ret lzma_index_hash_decode(lzma_index_hash *index_hash,
const uint8_t *in, size_t *in_pos, size_t in_size)
@ -92,7 +104,7 @@ extern lzma_ret lzma_index_hash_decode(lzma_index_hash *index_hash,
/**
* \brief Get the size of the Index field as bytes
*
* This is needed to verify the Index Size field from the Stream Footer.
* This is needed to verify the Backward Size field in the Stream Footer.
*/
extern lzma_vli lzma_index_hash_size(const lzma_index_hash *index_hash)
lzma_attr_pure;

2
src/liblzma/api/lzma/init.h
View file

@ -44,7 +44,7 @@
* functions, you may use other initialization functions, which initialize
* only a subset of liblzma's internal static variables. Using those
* functions have the following advantages:
* - When linking statically against liblzma, less useless functions will
* - When linking statically against liblzma, fewer useless functions will
* get linked into the binary. E.g. if you need only the decoder functions,
* using lzma_init_decoder() avoids linking bunch of encoder related code.
* - There is less things to initialize, making the initialization

12
src/liblzma/api/lzma/lzma.h
View file

@ -370,12 +370,12 @@ typedef struct {
*/
uint32_t depth;
/**
* \brief Reserved space for possible future extensions
*
* You should not touch these, because the names of these variables
* may change. These are and will never be used with the currently
* supported options, so it is safe to leave these uninitialized.
/*
* Reserved space to allow possible future extensions without
* breaking the ABI. You should not touch these, because the names
* of these variables may change. These are and will never be used
* with the currently supported options, so it is safe to leave these
* uninitialized.
*/
uint32_t reserved_int1;
uint32_t reserved_int2;

4
src/liblzma/api/lzma/simple.h
View file

@ -86,8 +86,8 @@ typedef struct {
* of the cross-section branch/call/jump instructions will use the
* same absolute addresses as in the first section.
*
* When the pointer to options is NULL, the default value is used.
* The default value is zero.
* When the pointer to options is NULL, the default value (zero)
* is used.
*/
uint32_t start_offset;

46
src/liblzma/api/lzma/stream_flags.h
View file

@ -1,6 +1,6 @@
/**
* \file lzma/stream_flags.h
* \brief .lzma Stream Header and Stream Footer encoder and decoder
* \brief .xz Stream Header and Stream Footer encoder and decoder
*
* \author Copyright (C) 1999-2006 Igor Pavlov
* \author Copyright (C) 2007 Lasse Collin
@ -25,7 +25,7 @@
* \brief Size of Stream Header and Stream Footer
*
* Stream Header and Stream Footer have the same size and they are not
* going to change even if a newer version of the .lzma file format is
* going to change even if a newer version of the .xz file format is
* developed in future.
*/
#define LZMA_STREAM_HEADER_SIZE 12
@ -55,8 +55,10 @@ typedef struct {
uint32_t version;
/**
* \brief Backward Size
*
* Backward Size must be a multiple of four bytes. In this Stream
* format version Backward Size is the size of the Index field.
* format version, Backward Size is the size of the Index field.
*
* Backward Size isn't actually part of the Stream Flags field, but
* it is convenient to include in this structure anyway. Backward
@ -73,11 +75,14 @@ typedef struct {
# define LZMA_BACKWARD_SIZE_MAX (LZMA_VLI_C(1) << 34)
/**
* Type of the Check calculated from uncompressed data
* \brief Check ID
*
* This indicates the type of the integrity check calculated from
* uncompressed data.
*/
lzma_check check;
/**
/*
* Reserved space to allow possible future extensions without
* breaking the ABI. You should not touch these, because the
* names of these variables may change.
@ -111,11 +116,11 @@ typedef struct {
/**
* \brief Encode Stream Header
*
* \param options Stream Header options to be encoded.
* options->backward_size is ignored and doesn't
* need to be initialized.
* \param out Beginning of the output buffer of
* LZMA_STREAM_HEADER_SIZE bytes.
* \param options Stream Header options to be encoded.
* options->index_size is ignored and doesn't
* need to be initialized.
*
* \return - LZMA_OK: Encoding was successful.
* - LZMA_OPTIONS_ERROR: options->version is not supported by
@ -130,9 +135,9 @@ extern lzma_ret lzma_stream_header_encode(
/**
* \brief Encode Stream Footer
*
* \param options Stream Footer options to be encoded.
* \param out Beginning of the output buffer of
* LZMA_STREAM_HEADER_SIZE bytes.
* \param options Stream Footer options to be encoded.
*
* \return - LZMA_OK: Encoding was successful.
* - LZMA_OPTIONS_ERROR: options->version is not supported by
@ -151,7 +156,7 @@ extern lzma_ret lzma_stream_footer_encode(
* \param in Beginning of the input buffer of
* LZMA_STREAM_HEADER_SIZE bytes.
*
* options->index_size is always set to LZMA_VLI_UNKNOWN. This is to
* options->backward_size is always set to LZMA_VLI_UNKNOWN. This is to
* help comparing Stream Flags from Stream Header and Stream Footer with
* lzma_stream_flags_compare().
*
@ -162,6 +167,17 @@ extern lzma_ret lzma_stream_footer_encode(
* is corrupt.
* - LZMA_OPTIONS_ERROR: Unsupported options are present
* in the header.
*
* \note When decoding .xz files that contain multiple Streams, it may
* make sense to print "file format not recognized" only if
* decoding of the Stream Header of the _first_ Stream gives
* LZMA_FORMAT_ERROR. If non-first Stream Header gives
* LZMA_FORMAT_ERROR, the message used for LZMA_DATA_ERROR is
* probably more appropriate.
*
* For example, Stream decoder in liblzma uses LZMA_DATA_ERROR if
* LZMA_FORMAT_ERROR is returned by lzma_stream_header_decode()
* when decoding non-first Stream.
*/
extern lzma_ret lzma_stream_header_decode(
lzma_stream_flags *options, const uint8_t *in)
@ -178,17 +194,17 @@ extern lzma_ret lzma_stream_header_decode(
* \return - LZMA_OK: Decoding was successful.
* - LZMA_FORMAT_ERROR: Magic bytes don't match, thus the given
* buffer cannot be Stream Footer.
* - LZMA_DATA_ERROR: CRC32 doesn't match, thus the footer
* - LZMA_DATA_ERROR: CRC32 doesn't match, thus the Stream Footer
* is corrupt.
* - LZMA_OPTIONS_ERROR: Unsupported options are present
* in the footer.
* in Stream Footer.
*
* \note If Stream Header was already decoded successfully, but
* decoding Stream Footer returns LZMA_FORMAT_ERROR, the
* application should probably report some other error message
* than "unsupported file format", since the file more likely is
* corrupt (possibly truncated). Stream decoder in liblzma uses
* LZMA_DATA_ERROR in this situation.
* than "file format not recognized", since the file more likely
* is corrupt (possibly truncated). Stream decoder in liblzma
* uses LZMA_DATA_ERROR in this situation.
*/
extern lzma_ret lzma_stream_footer_decode(
lzma_stream_flags *options, const uint8_t *in)

6
src/liblzma/api/lzma/version.h
View file

@ -30,10 +30,10 @@
* - zzz = revision
* - s indicates stability: 0 = alpha, 1 = beta, 2 = stable
*
* See the README file for details about the version numbering.
* See the README file for details about the version numbering. FIXME
*
* \note The version number of LZMA Utils (and thus liblzma)
* has nothing to with the version number of LZMA SDK.
* \note The version number of liblzma has nothing to with
* the version number of Igor Pavlov's LZMA SDK.
*/
#define LZMA_VERSION UINT32_C(49990060)

17
src/liblzma/api/lzma/vli.h
View file

@ -48,8 +48,7 @@
*
* This will always be unsigned integer. Valid VLI values are in the range
* [0, LZMA_VLI_MAX]. Unknown value is indicated with LZMA_VLI_UNKNOWN,
* which is the maximum value of the underlaying integer type (this feature
* is useful in several situations).
* which is the maximum value of the underlaying integer type.
*
* In future, even if lzma_vli is typdefined to something else than uint64_t,
* it is guaranteed that 2 * LZMA_VLI_MAX will not overflow lzma_vli.
@ -74,9 +73,9 @@ typedef uint64_t lzma_vli;
/**
* \brief Encodes variable-length integer
*
* In the .lzma format, most integers are encoded in variable-length
* representation. This saves space when smaller values are more likely
* than bigger values.
* In the .xz format, most integers are encoded in a variable-length
* representation, which is sometimes called little endian base-128 encoding.
* This saves space when smaller values are more likely than bigger values.
*
* The encoding scheme encodes seven bits to every byte, using minimum
* number of bytes required to represent the given value. Encodings that use
@ -118,8 +117,7 @@ typedef uint64_t lzma_vli;
* - LZMA_BUF_ERROR: No output space was provided.
* - LZMA_PROG_ERROR: Arguments are not sane.
*/
extern lzma_ret lzma_vli_encode(
lzma_vli vli, size_t *lzma_restrict vli_pos,
extern lzma_ret lzma_vli_encode(lzma_vli vli, size_t *lzma_restrict vli_pos,
uint8_t *lzma_restrict out, size_t *lzma_restrict out_pos,
size_t out_size);
@ -165,10 +163,9 @@ extern lzma_ret lzma_vli_decode(lzma_vli *lzma_restrict vli,
/**
* \brief Gets the number of bytes required to encode vli
* \brief Get the number of bytes required to encode a VLI
*
* \return Number of bytes on success (1-9). If vli isn't valid,
* zero is returned.
*/
extern uint32_t lzma_vli_size(lzma_vli vli)
lzma_attr_pure;
extern uint32_t lzma_vli_size(lzma_vli vli) lzma_attr_pure;

47
src/liblzma/common/alone_decoder.c
View file

@ -42,6 +42,9 @@ struct lzma_coder_s {
/// Memory usage limit
uint64_t memlimit;
/// Amount of memory actually needed (only an estimate)
uint64_t memusage;
/// Options decoded from the header needed to initialize
/// the LZMA decoder
lzma_options_lzma options;
@ -117,21 +120,16 @@ alone_decode(lzma_coder *coder,
}
++*in_pos;
break;
// Calculate the memory usage so that it is ready
// for SEQ_CODER_INIT.
coder->memusage = lzma_lzma_decoder_memusage(&coder->options)
+ LZMA_MEMUSAGE_BASE;
// Fall through
case SEQ_CODER_INIT: {
// FIXME It is unfair that this doesn't add a fixed amount
// like lzma_memusage_common() does.
const uint64_t memusage
= lzma_lzma_decoder_memusage(&coder->options);
// Use LZMA_PROG_ERROR since LZMA_Alone decoder cannot be
// built without LZMA support.
// FIXME TODO Make the above comment true.
if (memusage == UINT64_MAX)
return LZMA_PROG_ERROR;
if (memusage > coder->memlimit)
if (coder->memusage > coder->memlimit)
return LZMA_MEMLIMIT_ERROR;
lzma_filter_info filters[2] = {
@ -153,10 +151,9 @@ alone_decode(lzma_coder *coder,
coder->uncompressed_size);
coder->sequence = SEQ_CODE;
break;
}
// Fall through
case SEQ_CODE: {
return coder->next.code(coder->next.coder,
allocator, in, in_pos, in_size,
@ -180,12 +177,30 @@ alone_decoder_end(lzma_coder *coder, lzma_allocator *allocator)
}
static lzma_ret
alone_decoder_memconfig(lzma_coder *coder, uint64_t *memusage,
uint64_t *old_memlimit, uint64_t new_memlimit)
{
if (new_memlimit != 0 && new_memlimit < coder->memusage)
return LZMA_MEMLIMIT_ERROR;
*memusage = coder->memusage;
*old_memlimit = coder->memlimit;
coder->memlimit = new_memlimit;
return LZMA_OK;
}
extern lzma_ret
lzma_alone_decoder_init(lzma_next_coder *next, lzma_allocator *allocator,
uint64_t memlimit)
{
lzma_next_coder_init(lzma_alone_decoder_init, next, allocator);
if (memlimit == 0)
return LZMA_PROG_ERROR;
if (next->coder == NULL) {
next->coder = lzma_alloc(sizeof(lzma_coder), allocator);
if (next->coder == NULL)
@ -193,6 +208,7 @@ lzma_alone_decoder_init(lzma_next_coder *next, lzma_allocator *allocator,
next->code = &alone_decode;
next->end = &alone_decoder_end;
next->memconfig = &alone_decoder_memconfig;
next->coder->next = LZMA_NEXT_CODER_INIT;
}
@ -201,6 +217,7 @@ lzma_alone_decoder_init(lzma_next_coder *next, lzma_allocator *allocator,
next->coder->options.dict_size = 0;
next->coder->uncompressed_size = 0;
next->coder->memlimit = memlimit;
next->coder->memusage = LZMA_MEMUSAGE_BASE;
return LZMA_OK;
}

29
src/liblzma/common/auto_decoder.c
View file

@ -124,12 +124,40 @@ auto_decoder_get_check(const lzma_coder *coder)
}
static lzma_ret
auto_decoder_memconfig(lzma_coder *coder, uint64_t *memusage,
uint64_t *old_memlimit, uint64_t new_memlimit)
{
lzma_ret ret;
if (coder->next.memconfig != NULL) {
ret = coder->next.memconfig(coder->next.coder,
memusage, old_memlimit, new_memlimit);
assert(*old_memlimit == coder->memlimit);
} else {
// No coder is configured yet. Use the base value as
// the current memory usage.
*memusage = LZMA_MEMUSAGE_BASE;
*old_memlimit = coder->memlimit;
ret = LZMA_OK;
}
if (ret == LZMA_OK && new_memlimit != 0)
coder->memlimit = new_memlimit;
return ret;
}
static lzma_ret
auto_decoder_init(lzma_next_coder *next, lzma_allocator *allocator,
uint64_t memlimit, uint32_t flags)
{
lzma_next_coder_init(auto_decoder_init, next, allocator);
if (memlimit == 0)
return LZMA_PROG_ERROR;
if (flags & ~LZMA_SUPPORTED_FLAGS)
return LZMA_OPTIONS_ERROR;
@ -141,6 +169,7 @@ auto_decoder_init(lzma_next_coder *next, lzma_allocator *allocator,
next->code = &auto_decode;
next->end = &auto_decoder_end;
next->get_check = &auto_decoder_get_check;
next->memconfig = &auto_decoder_memconfig;
next->coder->next = LZMA_NEXT_CODER_INIT;
}

52
src/liblzma/common/block_util.c
View file

@ -22,31 +22,35 @@
extern LZMA_API lzma_ret
lzma_block_compressed_size(lzma_block *options, lzma_vli total_size)
lzma_block_compressed_size(lzma_block *block, lzma_vli total_size)
{
// Validate.
if (options->header_size < LZMA_BLOCK_HEADER_SIZE_MIN
|| options->header_size > LZMA_BLOCK_HEADER_SIZE_MAX
|| (options->header_size & 3)
|| (unsigned)(options->check) > LZMA_CHECK_ID_MAX
|| (total_size & 3))
// Validate everything but Uncompressed Size and filters.
if (lzma_block_unpadded_size(block) == 0)
return LZMA_PROG_ERROR;
const uint32_t container_size = options->header_size
+ lzma_check_size(options->check);
const uint32_t container_size = block->header_size
+ lzma_check_size(block->check);
// Validate that Compressed Size will be greater than zero.
if (container_size <= total_size)
return LZMA_DATA_ERROR;
options->compressed_size = total_size - container_size;
// Calculate what Compressed Size is supposed to be.
// If Compressed Size was present in Block Header,
// compare that the new value matches it.
const lzma_vli compressed_size = total_size - container_size;
if (block->compressed_size != LZMA_VLI_UNKNOWN
&& block->compressed_size != compressed_size)
return LZMA_DATA_ERROR;
block->compressed_size = compressed_size;
return LZMA_OK;
}
extern LZMA_API lzma_vli
lzma_block_unpadded_size(const lzma_block *options)
lzma_block_unpadded_size(const lzma_block *block)
{
// Validate the values that we are interested in i.e. all but
// Uncompressed Size and the filters.
@ -54,23 +58,23 @@ lzma_block_unpadded_size(const lzma_block *options)
// NOTE: This function is used for validation too, so it is
// essential that these checks are always done even if
// Compressed Size is unknown.
if (options->header_size < LZMA_BLOCK_HEADER_SIZE_MIN
|| options->header_size > LZMA_BLOCK_HEADER_SIZE_MAX
|| (options->header_size & 3)
|| !lzma_vli_is_valid(options->compressed_size)
|| options->compressed_size == 0
|| (unsigned int)(options->check) > LZMA_CHECK_ID_MAX)
if (block->header_size < LZMA_BLOCK_HEADER_SIZE_MIN
|| block->header_size > LZMA_BLOCK_HEADER_SIZE_MAX
|| (block->header_size & 3)
|| !lzma_vli_is_valid(block->compressed_size)
|| block->compressed_size == 0
|| (unsigned int)(block->check) > LZMA_CHECK_ID_MAX)
return 0;
// If Compressed Size is unknown, return that we cannot know
// size of the Block either.
if (options->compressed_size == LZMA_VLI_UNKNOWN)
if (block->compressed_size == LZMA_VLI_UNKNOWN)
return LZMA_VLI_UNKNOWN;
// Calculate Unpadded Size and validate it.
const lzma_vli unpadded_size = options->compressed_size
+ options->header_size
+ lzma_check_size(options->check);
const lzma_vli unpadded_size = block->compressed_size
+ block->header_size
+ lzma_check_size(block->check);
assert(unpadded_size >= UNPADDED_SIZE_MIN);
if (unpadded_size > UNPADDED_SIZE_MAX)
@ -81,11 +85,11 @@ lzma_block_unpadded_size(const lzma_block *options)
extern LZMA_API lzma_vli
lzma_block_total_size(const lzma_block *options)
lzma_block_total_size(const lzma_block *block)
{
lzma_vli unpadded_size = lzma_block_unpadded_size(options);
lzma_vli unpadded_size = lzma_block_unpadded_size(block);
if (unpadded_size != 0 && unpadded_size != LZMA_VLI_UNKNOWN)
if (unpadded_size != LZMA_VLI_UNKNOWN)
unpadded_size = vli_ceil4(unpadded_size);
return unpadded_size;

58
src/liblzma/common/common.c
View file

@ -301,5 +301,63 @@ lzma_end(lzma_stream *strm)
extern LZMA_API lzma_check
lzma_get_check(const lzma_stream *strm)
{
// Return LZMA_CHECK_NONE if we cannot know the check type.
// It's a bug in the application if this happens.
if (strm->internal->next.get_check == NULL)
return LZMA_CHECK_NONE;
return strm->internal->next.get_check(strm->internal->next.coder);
}
extern LZMA_API uint64_t
lzma_memusage(const lzma_stream *strm)
{
uint64_t memusage;
uint64_t old_memlimit;
if (strm == NULL || strm->internal == NULL
|| strm->internal->next.memconfig == NULL
|| strm->internal->next.memconfig(
strm->internal->next.coder,
&memusage, &old_memlimit, 0) != LZMA_OK)
return 0;
return memusage;
}
extern LZMA_API uint64_t
lzma_memlimit_get(const lzma_stream *strm)
{
uint64_t old_memlimit;
uint64_t memusage;
if (strm == NULL || strm->internal == NULL
|| strm->internal->next.memconfig == NULL
|| strm->internal->next.memconfig(
strm->internal->next.coder,
&memusage, &old_memlimit, 0) != LZMA_OK)
return 0;
return old_memlimit;
}
extern LZMA_API lzma_ret
lzma_memlimit_set(lzma_stream *strm, uint64_t new_memlimit)
{
// Dummy variables to simplify memconfig functions
uint64_t old_memlimit;
uint64_t memusage;
if (strm == NULL || strm->internal == NULL
|| strm->internal->next.memconfig == NULL)
return LZMA_PROG_ERROR;
if (new_memlimit != 0 && new_memlimit < LZMA_MEMUSAGE_BASE)
return LZMA_MEMLIMIT_ERROR;
return strm->internal->next.memconfig(strm->internal->next.coder,
&memusage, &old_memlimit, new_memlimit);
}

9
src/liblzma/common/common.h
View file

@ -46,6 +46,12 @@
#define LZMA_BUFFER_SIZE 4096
/// Starting value for memory usage estimates. Instead of calculating size
/// of _every_ structure and taking into accont malloc() overhead etc. we
/// add a base size to all memory usage estimates. It's not very accurate
/// but should be easily good enough.
#define LZMA_MEMUSAGE_BASE (UINT64_C(1) << 15)
/// Start of internal Filter ID space. These IDs must never be used
/// in Streams.
#define LZMA_FILTER_RESERVED_START (LZMA_VLI_C(1) << 62)
@ -134,7 +140,8 @@ struct lzma_next_coder_s {
/// Pointer to function to get and/or change the memory usage limit.
/// If memlimit == 0, the limit is not changed.
uint64_t (*memconfig)(lzma_coder *coder, uint64_t memlimit);
lzma_ret (*memconfig)(lzma_coder *coder, uint64_t *memusage,
uint64_t *old_memlimit, uint64_t new_memlimit);
};

33
src/liblzma/common/easy.c
View file

@ -33,8 +33,11 @@ struct lzma_coder_s {
static bool
easy_set_filters(lzma_coder *coder, uint32_t level)
easy_set_filters(lzma_coder *coder, uint32_t level, uint32_t flags)
{
// FIXME
(void)flags;
bool error = false;
if (level == 0) {
@ -43,7 +46,7 @@ easy_set_filters(lzma_coder *coder, uint32_t level)
#ifdef HAVE_ENCODER_LZMA2
} else if (level <= 9) {
error = lzma_lzma_preset(&coder->opt_lzma, level - 1);
error = lzma_lzma_preset(&coder->opt_lzma, level);
coder->filters[0].id = LZMA_FILTER_LZMA2;
coder->filters[0].options = &coder->opt_lzma;
coder->filters[1].id = LZMA_VLI_UNKNOWN;
@ -80,7 +83,7 @@ easy_encoder_end(lzma_coder *coder, lzma_allocator *allocator)
static lzma_ret
easy_encoder_init(lzma_next_coder *next, lzma_allocator *allocator,
lzma_easy_level level)
uint32_t level, uint32_t flags, lzma_check check)
{
lzma_next_coder_init(easy_encoder_init, next, allocator);
@ -95,18 +98,19 @@ easy_encoder_init(lzma_next_coder *next, lzma_allocator *allocator,
next->coder->stream_encoder = LZMA_NEXT_CODER_INIT;
}
if (easy_set_filters(next->coder, level))
if (easy_set_filters(next->coder, level, flags))
return LZMA_OPTIONS_ERROR;
return lzma_stream_encoder_init(&next->coder->stream_encoder,
allocator, next->coder->filters, LZMA_CHECK_CRC32);
allocator, next->coder->filters, check);
}
extern LZMA_API lzma_ret
lzma_easy_encoder(lzma_stream *strm, lzma_easy_level level)
lzma_easy_encoder(lzma_stream *strm,
uint32_t level, uint32_t flags, lzma_check check)
{
lzma_next_strm_init(easy_encoder_init, strm, level);
lzma_next_strm_init(easy_encoder_init, strm, level, flags, check);
strm->internal->supported_actions[LZMA_RUN] = true;
strm->internal->supported_actions[LZMA_SYNC_FLUSH] = true;
@ -118,11 +122,22 @@ lzma_easy_encoder(lzma_stream *strm, lzma_easy_level level)
extern LZMA_API uint64_t
lzma_easy_memory_usage(lzma_easy_level level)
lzma_easy_encoder_memusage(uint32_t level, uint32_t flags)
{
lzma_coder coder;
if (easy_set_filters(&coder, level))
if (easy_set_filters(&coder, level, flags))
return UINT32_MAX;
return lzma_memusage_encoder(coder.filters);
}
extern LZMA_API uint64_t
lzma_easy_decoder_memusage(uint32_t level, uint32_t flags)
{
lzma_coder coder;
if (easy_set_filters(&coder, level, flags))
return UINT32_MAX;
return lzma_memusage_decoder(coder.filters);
}

2
src/liblzma/common/filter_common.c
View file

@ -264,5 +264,5 @@ lzma_memusage_coder(lzma_filter_find coder_find,
// Add some fixed amount of extra. It's to compensate memory usage
// of Stream, Block etc. coders, malloc() overhead, stack etc.
return total + (1U << 15);
return total + LZMA_MEMUSAGE_BASE;
}

11
src/liblzma/common/index.c
View file

@ -114,6 +114,17 @@ struct lzma_index_s {
};
extern LZMA_API lzma_vli
lzma_index_memusage(lzma_vli count)
{
if (count > LZMA_VLI_MAX)
return UINT64_MAX;
return sizeof(lzma_index) + (count + INDEX_GROUP_SIZE - 1)
/ INDEX_GROUP_SIZE * sizeof(lzma_index_group);
}
static void
free_index_list(lzma_index *i, lzma_allocator *allocator)
{

46
src/liblzma/common/index_decoder.c
View file

@ -25,6 +25,7 @@ struct lzma_coder_s {
enum {
SEQ_INDICATOR,
SEQ_COUNT,
SEQ_MEMUSAGE,
SEQ_UNPADDED,
SEQ_UNCOMPRESSED,
SEQ_PADDING_INIT,
@ -32,6 +33,9 @@ struct lzma_coder_s {
SEQ_CRC32,
} sequence;
/// Memory usage limit
uint64_t memlimit;
/// Target Index
lzma_index *index;
@ -82,18 +86,27 @@ index_decode(lzma_coder *coder, lzma_allocator *allocator,
coder->sequence = SEQ_COUNT;
break;
case SEQ_COUNT: {
case SEQ_COUNT:
ret = lzma_vli_decode(&coder->count, &coder->pos,
in, in_pos, in_size);
if (ret != LZMA_STREAM_END)
goto out;
ret = LZMA_OK;
coder->pos = 0;
coder->sequence = SEQ_MEMUSAGE;
// Fall through
case SEQ_MEMUSAGE:
if (lzma_index_memusage(coder->count) > coder->memlimit) {
ret = LZMA_MEMLIMIT_ERROR;
goto out;
}
ret = LZMA_OK;
coder->sequence = coder->count == 0
? SEQ_PADDING_INIT : SEQ_UNPADDED;
break;
}
case SEQ_UNPADDED:
case SEQ_UNCOMPRESSED: {
@ -196,13 +209,29 @@ index_decoder_end(lzma_coder *coder, lzma_allocator *allocator)
}
static lzma_ret
index_decoder_memconfig(lzma_coder *coder, uint64_t *memusage,
uint64_t *old_memlimit, uint64_t new_memlimit)
{
*memusage = lzma_index_memusage(coder->count);
if (new_memlimit != 0 && new_memlimit < *memusage)
return LZMA_MEMLIMIT_ERROR;
*old_memlimit = coder->memlimit;
coder->memlimit = new_memlimit;
return LZMA_OK;
}
static lzma_ret
index_decoder_init(lzma_next_coder *next, lzma_allocator *allocator,
lzma_index **i)
lzma_index **i, uint64_t memlimit)
{
lzma_next_coder_init(index_decoder_init, next, allocator);
if (i == NULL)
if (i == NULL || memlimit == 0)
return LZMA_PROG_ERROR;
if (next->coder == NULL) {
@ -212,6 +241,7 @@ index_decoder_init(lzma_next_coder *next, lzma_allocator *allocator,
next->code = &index_decode;
next->end = &index_decoder_end;
next->memconfig = &index_decoder_memconfig;
next->coder->index = NULL;
} else {
lzma_index_end(next->coder->index, allocator);
@ -224,7 +254,9 @@ index_decoder_init(lzma_next_coder *next, lzma_allocator *allocator,
// Initialize the rest.
next->coder->sequence = SEQ_INDICATOR;
next->coder->memlimit = memlimit;
next->coder->index = *i;
next->coder->count = 0; // Needs to be initialized due to _memconfig().
next->coder->pos = 0;
next->coder->crc32 = 0;
@ -233,9 +265,9 @@ index_decoder_init(lzma_next_coder *next, lzma_allocator *allocator,
extern LZMA_API lzma_ret
lzma_index_decoder(lzma_stream *strm, lzma_index **i)
lzma_index_decoder(lzma_stream *strm, lzma_index **i, uint64_t memlimit)
{
lzma_next_strm_init(index_decoder_init, strm, i);
lzma_next_strm_init(index_decoder_init, strm, i, memlimit);
strm->internal->supported_actions[LZMA_RUN] = true;

39
src/liblzma/common/stream_decoder.c
View file

@ -50,6 +50,9 @@ struct lzma_coder_s {
/// Memory usage limit
uint64_t memlimit;
/// Amount of memory actually needed (only an estimate)
uint64_t memusage;
/// If true, LZMA_NO_CHECK is returned if the Stream has
/// no integrity check.
bool tell_no_check;
@ -204,14 +207,24 @@ stream_decode(lzma_coder *coder, lzma_allocator *allocator,
if (memusage == UINT64_MAX) {
// One or more unknown Filter IDs.
ret = LZMA_OPTIONS_ERROR;
} else if (memusage > coder->memlimit) {
} else {
// Now we can set coder->memusage since we know that
// the filter chain is valid. We don't want
// lzma_memusage() to return UINT64_MAX in case of
// invalid filter chain.
coder->memusage = memusage;
if (memusage > coder->memlimit) {
// The chain would need too much memory.
ret = LZMA_MEMLIMIT_ERROR;
} else {
// Memory usage is OK. Initialize the Block decoder.
// Memory usage is OK.
// Initialize the Block decoder.
ret = lzma_block_decoder_init(
&coder->block_decoder,
allocator, &coder->block_options);
allocator,
&coder->block_options);
}
}
// Free the allocated filter options since they are needed
@ -374,12 +387,30 @@ stream_decoder_get_check(const lzma_coder *coder)
}
static lzma_ret
stream_decoder_memconfig(lzma_coder *coder, uint64_t *memusage,
uint64_t *old_memlimit, uint64_t new_memlimit)
{
if (new_memlimit != 0 && new_memlimit < coder->memusage)
return LZMA_MEMLIMIT_ERROR;
*memusage = coder->memusage;
*old_memlimit = coder->memlimit;
coder->memlimit = new_memlimit;
return LZMA_OK;
}
extern lzma_ret
lzma_stream_decoder_init(lzma_next_coder *next, lzma_allocator *allocator,
uint64_t memlimit, uint32_t flags)
{
lzma_next_coder_init(lzma_stream_decoder_init, next, allocator);
if (memlimit == 0)
return LZMA_PROG_ERROR;
if (flags & ~LZMA_SUPPORTED_FLAGS)
return LZMA_OPTIONS_ERROR;
@ -391,12 +422,14 @@ lzma_stream_decoder_init(lzma_next_coder *next, lzma_allocator *allocator,
next->code = &stream_decode;
next->end = &stream_decoder_end;
next->get_check = &stream_decoder_get_check;
next->memconfig = &stream_decoder_memconfig;
next->coder->block_decoder = LZMA_NEXT_CODER_INIT;
next->coder->index_hash = NULL;
}
next->coder->memlimit = memlimit;
next->coder->memusage = LZMA_MEMUSAGE_BASE;
next->coder->tell_no_check = (flags & LZMA_TELL_NO_CHECK) != 0;
next->coder->tell_unsupported_check
= (flags & LZMA_TELL_UNSUPPORTED_CHECK) != 0;

6
src/liblzma/lzma/lzma2_encoder.c
View file

@ -369,11 +369,11 @@ lzma_lzma2_encoder_init(lzma_next_coder *next, lzma_allocator *allocator,
extern uint64_t
lzma_lzma2_encoder_memusage(const void *options)
{
const uint64_t lzma_memusage = lzma_lzma_encoder_memusage(options);
if (lzma_memusage == UINT64_MAX)
const uint64_t lzma_mem = lzma_lzma_encoder_memusage(options);
if (lzma_mem == UINT64_MAX)
return UINT64_MAX;
return sizeof(lzma_coder) + lzma_memusage;
return sizeof(lzma_coder) + lzma_mem;
}

10
tests/test_index.c
View file

@ -19,6 +19,8 @@
#include "tests.h"
#define MEMLIMIT (LZMA_VLI_C(1) << 20)
static lzma_index *
create_empty(void)
@ -170,7 +172,7 @@ test_code(lzma_index *i)
// Decode
lzma_index *d;
expect(lzma_index_decoder(&strm, &d) == LZMA_OK);
expect(lzma_index_decoder(&strm, &d, MEMLIMIT) == LZMA_OK);
succeed(decoder_loop(&strm, buf, index_size));
expect(lzma_index_equal(i, d));
@ -464,19 +466,19 @@ test_corrupt(void)
// Wrong Index Indicator
buf[0] ^= 1;
expect(lzma_index_decoder(&strm, &i) == LZMA_OK);
expect(lzma_index_decoder(&strm, &i, MEMLIMIT) == LZMA_OK);
succeed(decoder_loop_ret(&strm, buf, 1, LZMA_DATA_ERROR));
buf[0] ^= 1;
// Wrong Number of Records and thus CRC32 fails.
--buf[1];
expect(lzma_index_decoder(&strm, &i) == LZMA_OK);
expect(lzma_index_decoder(&strm, &i, MEMLIMIT) == LZMA_OK);
succeed(decoder_loop_ret(&strm, buf, 10, LZMA_DATA_ERROR));
++buf[1];
// Padding not NULs
buf[15] ^= 1;
expect(lzma_index_decoder(&strm, &i) == LZMA_OK);
expect(lzma_index_decoder(&strm, &i, MEMLIMIT) == LZMA_OK);
succeed(decoder_loop_ret(&strm, buf, 16, LZMA_DATA_ERROR));
lzma_end(&strm);