mirror of
https://git.tukaani.org/xz.git
synced 2024-04-04 12:36:23 +02:00
689e0228ba
Translations and doc/xz-file-format.txt and doc/lzma-file-format.txt were not touched. COPYING.0BSD was added.
126 lines
2.9 KiB
C
126 lines
2.9 KiB
C
///////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
/// \file known_sizes.c
|
|
/// \brief Encodes .lzma Stream with sizes known in Block Header
|
|
///
|
|
/// The input file is encoded in RAM, and the known Compressed Size
|
|
/// and/or Uncompressed Size values are stored in the Block Header.
|
|
/// As of writing there's no such Stream encoder in liblzma.
|
|
//
|
|
// Author: Lasse Collin
|
|
//
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
|
|
#include "sysdefs.h"
|
|
#include "lzma.h"
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/unistd.h>
|
|
#include <stdio.h>
|
|
|
|
|
|
// Support file sizes up to 1 MiB. We use this for output space too, so files
|
|
// close to 1 MiB had better compress at least a little or we have a buffer
|
|
// overflow.
|
|
#define BUFFER_SIZE (1U << 20)
|
|
|
|
|
|
int
|
|
main(void)
|
|
{
|
|
// Allocate the buffers.
|
|
uint8_t *in = malloc(BUFFER_SIZE);
|
|
uint8_t *out = malloc(BUFFER_SIZE);
|
|
if (in == NULL || out == NULL)
|
|
return 1;
|
|
|
|
// Fill the input buffer.
|
|
const size_t in_size = fread(in, 1, BUFFER_SIZE, stdin);
|
|
|
|
// Filter setup
|
|
lzma_options_lzma opt_lzma;
|
|
if (lzma_lzma_preset(&opt_lzma, 1))
|
|
return 1;
|
|
|
|
lzma_filter filters[] = {
|
|
{
|
|
.id = LZMA_FILTER_LZMA2,
|
|
.options = &opt_lzma
|
|
},
|
|
{
|
|
.id = LZMA_VLI_UNKNOWN
|
|
}
|
|
};
|
|
|
|
lzma_block block = {
|
|
.check = LZMA_CHECK_CRC32,
|
|
.compressed_size = BUFFER_SIZE, // Worst case reserve
|
|
.uncompressed_size = in_size,
|
|
.filters = filters,
|
|
};
|
|
|
|
lzma_stream strm = LZMA_STREAM_INIT;
|
|
if (lzma_block_encoder(&strm, &block) != LZMA_OK)
|
|
return 1;
|
|
|
|
// Reserve space for Stream Header and Block Header. We need to
|
|
// calculate the size of the Block Header first.
|
|
if (lzma_block_header_size(&block) != LZMA_OK)
|
|
return 1;
|
|
|
|
size_t out_size = LZMA_STREAM_HEADER_SIZE + block.header_size;
|
|
|
|
strm.next_in = in;
|
|
strm.avail_in = in_size;
|
|
strm.next_out = out + out_size;
|
|
strm.avail_out = BUFFER_SIZE - out_size;
|
|
|
|
if (lzma_code(&strm, LZMA_FINISH) != LZMA_STREAM_END)
|
|
return 1;
|
|
|
|
out_size += strm.total_out;
|
|
|
|
if (lzma_block_header_encode(&block, out + LZMA_STREAM_HEADER_SIZE)
|
|
!= LZMA_OK)
|
|
return 1;
|
|
|
|
lzma_index *idx = lzma_index_init(NULL);
|
|
if (idx == NULL)
|
|
return 1;
|
|
|
|
if (lzma_index_append(idx, NULL, block.header_size + strm.total_out,
|
|
strm.total_in) != LZMA_OK)
|
|
return 1;
|
|
|
|
if (lzma_index_encoder(&strm, idx) != LZMA_OK)
|
|
return 1;
|
|
|
|
if (lzma_code(&strm, LZMA_RUN) != LZMA_STREAM_END)
|
|
return 1;
|
|
|
|
out_size += strm.total_out;
|
|
|
|
lzma_end(&strm);
|
|
|
|
lzma_index_end(idx, NULL);
|
|
|
|
// Encode the Stream Header and Stream Footer. backwards_size is
|
|
// needed only for the Stream Footer.
|
|
lzma_stream_flags sf = {
|
|
.backward_size = strm.total_out,
|
|
.check = block.check,
|
|
};
|
|
|
|
if (lzma_stream_header_encode(&sf, out) != LZMA_OK)
|
|
return 1;
|
|
|
|
if (lzma_stream_footer_encode(&sf, out + out_size) != LZMA_OK)
|
|
return 1;
|
|
|
|
out_size += LZMA_STREAM_HEADER_SIZE;
|
|
|
|
// Write out the file.
|
|
fwrite(out, 1, out_size, stdout);
|
|
|
|
return 0;
|
|
}
|