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3b34851de1
broken. API has changed a lot and it will still change a little more here and there. The command line tool doesn't have all the required changes to reflect the API changes, so it's easy to get "internal error" or trigger assertions.
135 lines
3.5 KiB
C
135 lines
3.5 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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// Copyright (C) 2008 Lasse Collin
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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///////////////////////////////////////////////////////////////////////////////
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#include "sysdefs.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_filter filters[] = {
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{
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.id = LZMA_FILTER_LZMA2,
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.options = (void *)(&lzma_preset_lzma[0])
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},
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{
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.id = LZMA_VLI_VALUE_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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// FIXME Insane paranoia in liblzma.
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if (lzma_block_header_size(&block) != LZMA_OK)
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return 1;
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// We don't actually know the compressed size, so don't tell it to
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// Block encoder.
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block.compressed_size = LZMA_VLI_VALUE_UNKNOWN;
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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.
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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, 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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