mirror of https://git.tukaani.org/xz.git
130 lines
3.0 KiB
C
130 lines
3.0 KiB
C
///////////////////////////////////////////////////////////////////////////////
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//
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/// \file known_sizes.c
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/// \brief Encodes .lzma Stream with sizes known in Block Header
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///
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/// The input file is encoded in RAM, and the known Compressed Size
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/// and/or Uncompressed Size values are stored in the Block Header.
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/// As of writing there's no such Stream encoder in liblzma.
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//
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// Author: Lasse Collin
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//
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// This file has been put into the public domain.
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// You can do whatever you want with this file.
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//
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///////////////////////////////////////////////////////////////////////////////
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#include "sysdefs.h"
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#include "lzma.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/unistd.h>
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#include <stdio.h>
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// Support file sizes up to 1 MiB. We use this for output space too, so files
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// close to 1 MiB had better compress at least a little or we have a buffer
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// overflow.
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#define BUFFER_SIZE (1U << 20)
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int
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main(void)
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{
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// Allocate the buffers.
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uint8_t *in = malloc(BUFFER_SIZE);
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uint8_t *out = malloc(BUFFER_SIZE);
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if (in == NULL || out == NULL)
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return 1;
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// Fill the input buffer.
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const size_t in_size = fread(in, 1, BUFFER_SIZE, stdin);
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// Filter setup
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lzma_options_lzma opt_lzma;
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if (lzma_lzma_preset(&opt_lzma, 1))
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return 1;
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lzma_filter filters[] = {
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{
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.id = LZMA_FILTER_LZMA2,
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.options = &opt_lzma
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},
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{
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.id = LZMA_VLI_UNKNOWN
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}
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};
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lzma_block block = {
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.check = LZMA_CHECK_CRC32,
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.compressed_size = BUFFER_SIZE, // Worst case reserve
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.uncompressed_size = in_size,
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.filters = filters,
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};
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lzma_stream strm = LZMA_STREAM_INIT;
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if (lzma_block_encoder(&strm, &block) != LZMA_OK)
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return 1;
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// Reserve space for Stream Header and Block Header. We need to
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// calculate the size of the Block Header first.
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if (lzma_block_header_size(&block) != LZMA_OK)
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return 1;
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size_t out_size = LZMA_STREAM_HEADER_SIZE + block.header_size;
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strm.next_in = in;
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strm.avail_in = in_size;
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strm.next_out = out + out_size;
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strm.avail_out = BUFFER_SIZE - out_size;
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if (lzma_code(&strm, LZMA_FINISH) != LZMA_STREAM_END)
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return 1;
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out_size += strm.total_out;
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if (lzma_block_header_encode(&block, out + LZMA_STREAM_HEADER_SIZE)
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!= LZMA_OK)
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return 1;
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lzma_index *idx = lzma_index_init(NULL);
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if (idx == NULL)
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return 1;
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if (lzma_index_append(idx, NULL, block.header_size + strm.total_out,
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strm.total_in) != LZMA_OK)
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return 1;
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if (lzma_index_encoder(&strm, idx) != LZMA_OK)
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return 1;
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if (lzma_code(&strm, LZMA_RUN) != LZMA_STREAM_END)
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return 1;
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out_size += strm.total_out;
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lzma_end(&strm);
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lzma_index_end(idx, NULL);
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// Encode the Stream Header and Stream Footer. backwards_size is
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// needed only for the Stream Footer.
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lzma_stream_flags sf = {
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.backward_size = strm.total_out,
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.check = block.check,
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};
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if (lzma_stream_header_encode(&sf, out) != LZMA_OK)
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return 1;
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if (lzma_stream_footer_encode(&sf, out + out_size) != LZMA_OK)
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return 1;
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out_size += LZMA_STREAM_HEADER_SIZE;
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// Write out the file.
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fwrite(out, 1, out_size, stdout);
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return 0;
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}
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