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liblzma: Improve documentation for container.h

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Standardizing each function to always specify parameters and return
values. Also moved the parameters and return values to the end of each
function description.
This commit is contained in:
Jia Tan 2023-01-26 23:16:34 +08:00
parent c9c8bfae35
commit 14cd30806d
1 changed files with 93 additions and 53 deletions
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146
src/liblzma/api/lzma/container.h
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@ -294,6 +294,15 @@ extern LZMA_API(uint64_t) lzma_easy_decoder_memusage(uint32_t preset)
* This function is intended for those who just want to use the basic features * This function is intended for those who just want to use the basic features
* if liblzma (that is, most developers out there). * if liblzma (that is, most developers out there).
* *
* If initialization fails (return value is not LZMA_OK), all the memory
* allocated for *strm by liblzma is always freed. Thus, there is no need
* to call lzma_end() after failed initialization.
*
* 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 or flags that don't support LZMA_SYNC_FLUSH.
*
* \param strm Pointer to lzma_stream that is at least initialized * \param strm Pointer to lzma_stream that is at least initialized
* with LZMA_STREAM_INIT. * with LZMA_STREAM_INIT.
* \param preset Compression preset to use. A preset consist of level * \param preset Compression preset to use. A preset consist of level
@ -308,7 +317,8 @@ extern LZMA_API(uint64_t) lzma_easy_decoder_memusage(uint32_t preset)
* unsure. LZMA_CHECK_CRC32 is good too as long as the * unsure. LZMA_CHECK_CRC32 is good too as long as the
* uncompressed file is not many gigabytes. * uncompressed file is not many gigabytes.
* *
* \return - LZMA_OK: Initialization succeeded. Use lzma_code() to * \return Possible lzma_ret values:
* - LZMA_OK: Initialization succeeded. Use lzma_code() to
* encode your data. * encode your data.
* - LZMA_MEM_ERROR: Memory allocation failed. * - LZMA_MEM_ERROR: Memory allocation failed.
* - LZMA_OPTIONS_ERROR: The given compression preset is not * - LZMA_OPTIONS_ERROR: The given compression preset is not
@ -317,15 +327,6 @@ extern LZMA_API(uint64_t) lzma_easy_decoder_memusage(uint32_t preset)
* supported by this liblzma build. * supported by this liblzma build.
* - LZMA_PROG_ERROR: One or more of the parameters have values * - LZMA_PROG_ERROR: One or more of the parameters have values
* that will never be valid. For example, strm == NULL. * that will never be valid. For example, strm == NULL.
*
* If initialization fails (return value is not LZMA_OK), all the memory
* allocated for *strm by liblzma is always freed. Thus, there is no need
* to call lzma_end() after failed initialization.
*
* 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 or flags that don't support LZMA_SYNC_FLUSH.
*/ */
extern LZMA_API(lzma_ret) lzma_easy_encoder( extern LZMA_API(lzma_ret) lzma_easy_encoder(
lzma_stream *strm, uint32_t preset, lzma_check check) lzma_stream *strm, uint32_t preset, lzma_check check)
@ -346,13 +347,14 @@ extern LZMA_API(lzma_ret) lzma_easy_encoder(
* Set to NULL to use malloc() and free(). * Set to NULL to use malloc() and free().
* \param in Beginning of the input buffer * \param in Beginning of the input buffer
* \param in_size Size of the input buffer * \param in_size Size of the input buffer
* \param out Beginning of the output buffer * \param[out] out Beginning of the output buffer
* \param out_pos The next byte will be written to out[*out_pos]. * \param[out] out_pos The next byte will be written to out[*out_pos].
* *out_pos is updated only if encoding succeeds. * *out_pos is updated only if encoding succeeds.
* \param out_size Size of the out buffer; the first byte into * \param out_size Size of the out buffer; the first byte into
* which no data is written to is out[out_size]. * which no data is written to is out[out_size].
* *
* \return - LZMA_OK: Encoding was successful. * \return Possible lzma_ret values:
* - LZMA_OK: Encoding was successful.
* - LZMA_BUF_ERROR: Not enough output buffer space. * - LZMA_BUF_ERROR: Not enough output buffer space.
* - LZMA_UNSUPPORTED_CHECK * - LZMA_UNSUPPORTED_CHECK
* - LZMA_OPTIONS_ERROR * - LZMA_OPTIONS_ERROR
@ -370,14 +372,16 @@ extern LZMA_API(lzma_ret) lzma_easy_buffer_encode(
/** /**
* \brief Initialize .xz Stream encoder using a custom filter chain * \brief Initialize .xz Stream encoder using a custom filter chain
* *
* \param strm Pointer to properly prepared lzma_stream * \param strm Pointer to lzma_stream that is at least initialized
* with LZMA_STREAM_INIT.
* \param filters Array of filters. This must be terminated with * \param filters Array of filters. This must be terminated with
* filters[n].id = LZMA_VLI_UNKNOWN. See filter.h for * filters[n].id = LZMA_VLI_UNKNOWN. See filter.h for
* more information. * more information.
* \param check Type of the integrity check to calculate from * \param check Type of the integrity check to calculate from
* uncompressed data. * uncompressed data.
* *
* \return - LZMA_OK: Initialization was successful. * \return Possible lzma_ret values:
* - LZMA_OK: Initialization was successful.
* - LZMA_MEM_ERROR * - LZMA_MEM_ERROR
* - LZMA_UNSUPPORTED_CHECK * - LZMA_UNSUPPORTED_CHECK
* - LZMA_OPTIONS_ERROR * - LZMA_OPTIONS_ERROR
@ -417,10 +421,12 @@ extern LZMA_API(uint64_t) lzma_stream_encoder_mt_memusage(
* LZMA_FULL_BARRIER, and LZMA_FINISH. Support for LZMA_SYNC_FLUSH might be * LZMA_FULL_BARRIER, and LZMA_FINISH. Support for LZMA_SYNC_FLUSH might be
* added in the future. * added in the future.
* *
* \param strm Pointer to properly prepared lzma_stream * \param strm Pointer to lzma_stream that is at least initialized
* with LZMA_STREAM_INIT.
* \param options Pointer to multithreaded compression options * \param options Pointer to multithreaded compression options
* *
* \return - LZMA_OK * \return Possible lzma_ret values:
* - LZMA_OK
* - LZMA_MEM_ERROR * - LZMA_MEM_ERROR
* - LZMA_UNSUPPORTED_CHECK * - LZMA_UNSUPPORTED_CHECK
* - LZMA_OPTIONS_ERROR * - LZMA_OPTIONS_ERROR
@ -446,7 +452,12 @@ extern LZMA_API(lzma_ret) lzma_stream_encoder_mt(
* No kind of flushing is supported, because the file format doesn't make * No kind of flushing is supported, because the file format doesn't make
* it possible. * it possible.
* *
* \return - LZMA_OK * \param strm Pointer to lzma_stream that is at least initialized
* with LZMA_STREAM_INIT.
* \param options Pointer to encoder options
*
* \return Possible lzma_ret values:
* - LZMA_OK
* - LZMA_MEM_ERROR * - LZMA_MEM_ERROR
* - LZMA_OPTIONS_ERROR * - LZMA_OPTIONS_ERROR
* - LZMA_PROG_ERROR * - LZMA_PROG_ERROR
@ -477,6 +488,11 @@ extern LZMA_API(lzma_ret) lzma_alone_encoder(
* will) have larger maximum expansion when encoding * will) have larger maximum expansion when encoding
* uncompressible data. Currently there is no function to * uncompressible data. Currently there is no function to
* calculate the maximum expansion of multi-call encoding. * calculate the maximum expansion of multi-call encoding.
*
* \param uncompressed_size Size in bytes of the uncompressed
* input data
*
* \return Maximum number of bytes needed to store the compressed data.
*/ */
extern LZMA_API(size_t) lzma_stream_buffer_bound(size_t uncompressed_size) extern LZMA_API(size_t) lzma_stream_buffer_bound(size_t uncompressed_size)
lzma_nothrow; lzma_nothrow;
@ -494,13 +510,14 @@ extern LZMA_API(size_t) lzma_stream_buffer_bound(size_t uncompressed_size)
* Set to NULL to use malloc() and free(). * Set to NULL to use malloc() and free().
* \param in Beginning of the input buffer * \param in Beginning of the input buffer
* \param in_size Size of the input buffer * \param in_size Size of the input buffer
* \param out Beginning of the output buffer * \param[out] out Beginning of the output buffer
* \param out_pos The next byte will be written to out[*out_pos]. * \param[out] out_pos The next byte will be written to out[*out_pos].
* *out_pos is updated only if encoding succeeds. * *out_pos is updated only if encoding succeeds.
* \param out_size Size of the out buffer; the first byte into * \param out_size Size of the out buffer; the first byte into
* which no data is written to is out[out_size]. * which no data is written to is out[out_size].
* *
* \return - LZMA_OK: Encoding was successful. * \return Possible lzma_ret values:
* - LZMA_OK: Encoding was successful.
* - LZMA_BUF_ERROR: Not enough output buffer space. * - LZMA_BUF_ERROR: Not enough output buffer space.
* - LZMA_UNSUPPORTED_CHECK * - LZMA_UNSUPPORTED_CHECK
* - LZMA_OPTIONS_ERROR * - LZMA_OPTIONS_ERROR
@ -556,7 +573,12 @@ extern LZMA_API(lzma_ret) lzma_stream_buffer_encode(
* uses too where many small streams are needed. XZ Embedded includes a * uses too where many small streams are needed. XZ Embedded includes a
* decoder for this format. * decoder for this format.
* *
* \return - LZMA_STREAM_END: All good. Check the amounts of input used * \param strm Pointer to lzma_stream that is at least initialized
* with LZMA_STREAM_INIT.
* \param options Pointer to encoder options
*
* \return Possible lzma_ret values:
* - LZMA_STREAM_END: All good. Check the amounts of input used
* and output produced. Store the amount of input used * and output produced. Store the amount of input used
* (uncompressed size) as it needs to be known to decompress * (uncompressed size) as it needs to be known to decompress
* the data. * the data.
@ -673,7 +695,8 @@ extern LZMA_API(lzma_ret) lzma_microlzma_encoder(
/** /**
* \brief Initialize .xz Stream decoder * \brief Initialize .xz Stream decoder
* *
* \param strm Pointer to properly prepared lzma_stream * \param strm Pointer to lzma_stream that is at least initialized
* with LZMA_STREAM_INIT.
* \param memlimit Memory usage limit as bytes. Use UINT64_MAX * \param memlimit Memory usage limit as bytes. Use UINT64_MAX
* to effectively disable the limiter. liblzma * to effectively disable the limiter. liblzma
* 5.2.3 and earlier don't allow 0 here and return * 5.2.3 and earlier don't allow 0 here and return
@ -684,7 +707,8 @@ extern LZMA_API(lzma_ret) lzma_microlzma_encoder(
* LZMA_TELL_ANY_CHECK, LZMA_IGNORE_CHECK, * LZMA_TELL_ANY_CHECK, LZMA_IGNORE_CHECK,
* LZMA_CONCATENATED, LZMA_FAIL_FAST * LZMA_CONCATENATED, LZMA_FAIL_FAST
* *
* \return - LZMA_OK: Initialization was successful. * \return Possible lzma_ret values:
* - LZMA_OK: Initialization was successful.
* - LZMA_MEM_ERROR: Cannot allocate memory. * - LZMA_MEM_ERROR: Cannot allocate memory.
* - LZMA_OPTIONS_ERROR: Unsupported flags * - LZMA_OPTIONS_ERROR: Unsupported flags
* - LZMA_PROG_ERROR * - LZMA_PROG_ERROR
@ -697,9 +721,6 @@ extern LZMA_API(lzma_ret) lzma_stream_decoder(
/** /**
* \brief Initialize multithreaded .xz Stream decoder * \brief Initialize multithreaded .xz Stream decoder
* *
* \param strm Pointer to properly prepared lzma_stream
* \param options Pointer to multithreaded compression options
*
* The decoder can decode multiple Blocks in parallel. This requires that each * The decoder can decode multiple Blocks in parallel. This requires that each
* Block Header contains the Compressed Size and Uncompressed size fields * Block Header contains the Compressed Size and Uncompressed size fields
* which are added by the multi-threaded encoder, see lzma_stream_encoder_mt(). * which are added by the multi-threaded encoder, see lzma_stream_encoder_mt().
@ -713,7 +734,12 @@ extern LZMA_API(lzma_ret) lzma_stream_decoder(
* This function behaves like lzma_stream_decoder() when options->threads == 1 * This function behaves like lzma_stream_decoder() when options->threads == 1
* and options->memlimit_threading <= 1. * and options->memlimit_threading <= 1.
* *
* \return - LZMA_OK: Initialization was successful. * \param strm Pointer to lzma_stream that is at least initialized
* with LZMA_STREAM_INIT.
* \param options Pointer to multithreaded compression options
*
* \return Possible lzma_ret values:
* - LZMA_OK: Initialization was successful.
* - LZMA_MEM_ERROR: Cannot allocate memory. * - LZMA_MEM_ERROR: Cannot allocate memory.
* - LZMA_MEMLIMIT_ERROR: Memory usage limit was reached. * - LZMA_MEMLIMIT_ERROR: Memory usage limit was reached.
* - LZMA_OPTIONS_ERROR: Unsupported flags. * - LZMA_OPTIONS_ERROR: Unsupported flags.
@ -740,7 +766,8 @@ extern LZMA_API(lzma_ret) lzma_stream_decoder_mt(
* as it doesn't support any decoder flags. It will return LZMA_STREAM_END * as it doesn't support any decoder flags. It will return LZMA_STREAM_END
* after one .lzma stream.) * after one .lzma stream.)
* *
* \param strm Pointer to properly prepared lzma_stream * \param strm Pointer to lzma_stream that is at least initialized
* with LZMA_STREAM_INIT.
* \param memlimit Memory usage limit as bytes. Use UINT64_MAX * \param memlimit Memory usage limit as bytes. Use UINT64_MAX
* to effectively disable the limiter. liblzma * to effectively disable the limiter. liblzma
* 5.2.3 and earlier don't allow 0 here and return * 5.2.3 and earlier don't allow 0 here and return
@ -751,7 +778,8 @@ extern LZMA_API(lzma_ret) lzma_stream_decoder_mt(
* LZMA_TELL_ANY_CHECK, LZMA_IGNORE_CHECK, * LZMA_TELL_ANY_CHECK, LZMA_IGNORE_CHECK,
* LZMA_CONCATENATED, LZMA_FAIL_FAST * LZMA_CONCATENATED, LZMA_FAIL_FAST
* *
* \return - LZMA_OK: Initialization was successful. * \return Possible lzma_ret values:
* - LZMA_OK: Initialization was successful.
* - LZMA_MEM_ERROR: Cannot allocate memory. * - LZMA_MEM_ERROR: Cannot allocate memory.
* - LZMA_OPTIONS_ERROR: Unsupported flags * - LZMA_OPTIONS_ERROR: Unsupported flags
* - LZMA_PROG_ERROR * - LZMA_PROG_ERROR
@ -764,18 +792,20 @@ extern LZMA_API(lzma_ret) lzma_auto_decoder(
/** /**
* \brief Initialize .lzma decoder (legacy file format) * \brief Initialize .lzma decoder (legacy file format)
* *
* \param strm Pointer to properly prepared lzma_stream * Valid `action' arguments to lzma_code() are LZMA_RUN and LZMA_FINISH.
* There is no need to use LZMA_FINISH, but it's allowed because it may
* simplify certain types of applications.
*
* \param strm Pointer to lzma_stream that is at least initialized
* with LZMA_STREAM_INIT.
* \param memlimit Memory usage limit as bytes. Use UINT64_MAX * \param memlimit Memory usage limit as bytes. Use UINT64_MAX
* to effectively disable the limiter. liblzma * to effectively disable the limiter. liblzma
* 5.2.3 and earlier don't allow 0 here and return * 5.2.3 and earlier don't allow 0 here and return
* LZMA_PROG_ERROR; later versions treat 0 as if 1 * LZMA_PROG_ERROR; later versions treat 0 as if 1
* had been specified. * had been specified.
* *
* Valid `action' arguments to lzma_code() are LZMA_RUN and LZMA_FINISH. * \return Possible lzma_ret values:
* There is no need to use LZMA_FINISH, but it's allowed because it may * - LZMA_OK
* simplify certain types of applications.
*
* \return - LZMA_OK
* - LZMA_MEM_ERROR * - LZMA_MEM_ERROR
* - LZMA_PROG_ERROR * - LZMA_PROG_ERROR
*/ */
@ -787,18 +817,6 @@ extern LZMA_API(lzma_ret) lzma_alone_decoder(
/** /**
* \brief Initialize .lz (lzip) decoder (a foreign file format) * \brief Initialize .lz (lzip) decoder (a foreign file format)
* *
* \param strm Pointer to properly prepared lzma_stream
* \param memlimit Memory usage limit as bytes. Use UINT64_MAX
* to effectively disable the limiter.
* \param flags Bitwise-or of flags, or zero for no flags.
* All decoder flags listed above are supported
* although only LZMA_CONCATENATED and (in very rare
* cases) LZMA_IGNORE_CHECK are actually useful.
* LZMA_TELL_NO_CHECK, LZMA_TELL_UNSUPPORTED_CHECK,
* and LZMA_FAIL_FAST do nothing. LZMA_TELL_ANY_CHECK
* is supported for consistency only as CRC32 is
* always used in the .lz format.
*
* This decoder supports the .lz format version 0 and the unextended .lz * This decoder supports the .lz format version 0 and the unextended .lz
* format version 1: * format version 1:
* *
@ -832,7 +850,21 @@ extern LZMA_API(lzma_ret) lzma_alone_decoder(
* one should ensure that none of the first four bytes of trailing data are * one should ensure that none of the first four bytes of trailing data are
* equal to the magic bytes because lzip >= 1.20 requires it by default. * equal to the magic bytes because lzip >= 1.20 requires it by default.
* *
* \return - LZMA_OK: Initialization was successful. * \param strm Pointer to lzma_stream that is at least initialized
* with LZMA_STREAM_INIT.
* \param memlimit Memory usage limit as bytes. Use UINT64_MAX
* to effectively disable the limiter.
* \param flags Bitwise-or of flags, or zero for no flags.
* All decoder flags listed above are supported
* although only LZMA_CONCATENATED and (in very rare
* cases) LZMA_IGNORE_CHECK are actually useful.
* LZMA_TELL_NO_CHECK, LZMA_TELL_UNSUPPORTED_CHECK,
* and LZMA_FAIL_FAST do nothing. LZMA_TELL_ANY_CHECK
* is supported for consistency only as CRC32 is
* always used in the .lz format.
*
* \return Possible lzma_ret values:
* - LZMA_OK: Initialization was successful.
* - LZMA_MEM_ERROR: Cannot allocate memory. * - LZMA_MEM_ERROR: Cannot allocate memory.
* - LZMA_OPTIONS_ERROR: Unsupported flags * - LZMA_OPTIONS_ERROR: Unsupported flags
* - LZMA_PROG_ERROR * - LZMA_PROG_ERROR
@ -861,13 +893,14 @@ extern LZMA_API(lzma_ret) lzma_lzip_decoder(
* *in_pos is updated only if decoding succeeds. * *in_pos is updated only if decoding succeeds.
* \param in_size Size of the input buffer; the first byte that * \param in_size Size of the input buffer; the first byte that
* won't be read is in[in_size]. * won't be read is in[in_size].
* \param out Beginning of the output buffer * \param[out] out Beginning of the output buffer
* \param out_pos The next byte will be written to out[*out_pos]. * \param[out] out_pos The next byte will be written to out[*out_pos].
* *out_pos is updated only if decoding succeeds. * *out_pos is updated only if decoding succeeds.
* \param out_size Size of the out buffer; the first byte into * \param out_size Size of the out buffer; the first byte into
* which no data is written to is out[out_size]. * which no data is written to is out[out_size].
* *
* \return - LZMA_OK: Decoding was successful. * \return Possible lzma_ret values:
* - LZMA_OK: Decoding was successful.
* - LZMA_FORMAT_ERROR * - LZMA_FORMAT_ERROR
* - LZMA_OPTIONS_ERROR * - LZMA_OPTIONS_ERROR
* - LZMA_DATA_ERROR * - LZMA_DATA_ERROR
@ -897,7 +930,8 @@ extern LZMA_API(lzma_ret) lzma_stream_buffer_decode(
* The lzma_code() usage with this decoder is completely normal. The * The lzma_code() usage with this decoder is completely normal. The
* special behavior of lzma_code() applies to lzma_microlzma_encoder() only. * special behavior of lzma_code() applies to lzma_microlzma_encoder() only.
* *
* \param strm Pointer to properly prepared lzma_stream * \param strm Pointer to lzma_stream that is at least initialized
* with LZMA_STREAM_INIT.
* \param comp_size Compressed size of the MicroLZMA stream. * \param comp_size Compressed size of the MicroLZMA stream.
* The caller must somehow know this exactly. * The caller must somehow know this exactly.
* \param uncomp_size Uncompressed size of the MicroLZMA stream. * \param uncomp_size Uncompressed size of the MicroLZMA stream.
@ -922,6 +956,12 @@ extern LZMA_API(lzma_ret) lzma_stream_buffer_decode(
* the implementation in XZ Embedded it doesn't * the implementation in XZ Embedded it doesn't
* affect the memory usage if one specifies bigger * affect the memory usage if one specifies bigger
* dictionary than actually required.) * dictionary than actually required.)
*
* \return Possible lzma_ret values:
* - LZMA_OK
* - LZMA_MEM_ERROR
* - LZMA_OPTIONS_ERROR
* - LZMA_PROG_ERROR
*/ */
extern LZMA_API(lzma_ret) lzma_microlzma_decoder( extern LZMA_API(lzma_ret) lzma_microlzma_decoder(
lzma_stream *strm, uint64_t comp_size, lzma_stream *strm, uint64_t comp_size,