mirror of https://git.tukaani.org/xz.git
142 lines
3.6 KiB
C
142 lines
3.6 KiB
C
///////////////////////////////////////////////////////////////////////////////
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//
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/// \file sync_flush.c
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/// \brief Encode files using LZMA_SYNC_FLUSH
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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 <stdio.h>
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static lzma_stream strm = LZMA_STREAM_INIT;
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static FILE *file_in;
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static void
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encode(size_t size, lzma_action action)
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{
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static const size_t CHUNK = 64;
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uint8_t in[CHUNK];
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uint8_t out[CHUNK];
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lzma_ret ret;
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do {
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if (strm.avail_in == 0 && size > 0) {
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const size_t amount = MIN(size, CHUNK);
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strm.avail_in = fread(in, 1, amount, file_in);
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strm.next_in = in;
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size -= amount; // Intentionally not using avail_in.
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}
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strm.next_out = out;
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strm.avail_out = CHUNK;
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ret = lzma_code(&strm, size == 0 ? action : LZMA_RUN);
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if (ret != LZMA_OK && ret != LZMA_STREAM_END) {
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fprintf(stderr, "%s:%u: %s: ret == %d\n",
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__FILE__, __LINE__, __func__, ret);
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exit(1);
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}
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fwrite(out, 1, CHUNK - strm.avail_out, stdout);
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} while (size > 0 || strm.avail_out == 0);
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if ((action == LZMA_RUN && ret != LZMA_OK)
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|| (action != LZMA_RUN && ret != LZMA_STREAM_END)) {
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fprintf(stderr, "%s:%u: %s: ret == %d\n",
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__FILE__, __LINE__, __func__, ret);
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exit(1);
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}
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}
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int
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main(int argc, char **argv)
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{
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lzma_init_encoder();
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file_in = argc > 1 ? fopen(argv[1], "rb") : stdin;
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// Config
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lzma_options_lzma opt_lzma = {
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.dictionary_size = 1 << 16,
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.literal_context_bits = LZMA_LITERAL_CONTEXT_BITS_DEFAULT,
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.literal_pos_bits = LZMA_LITERAL_POS_BITS_DEFAULT,
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.pos_bits = LZMA_POS_BITS_DEFAULT,
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.preset_dictionary = NULL,
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.persistent = true,
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.mode = LZMA_MODE_NORMAL,
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.fast_bytes = 32,
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.match_finder = LZMA_MF_HC3,
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.match_finder_cycles = 0,
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};
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lzma_options_delta opt_delta = {
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.distance = 16
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};
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lzma_options_subblock opt_subblock = {
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.allow_subfilters = true,
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.alignment = 8, // LZMA_SUBBLOCK_ALIGNMENT_DEFAULT,
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.subblock_data_size = LZMA_SUBBLOCK_DATA_SIZE_DEFAULT,
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.rle = 1, // LZMA_SUBBLOCK_RLE_OFF,
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.subfilter_mode = LZMA_SUBFILTER_SET,
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};
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opt_subblock.subfilter_options.id = LZMA_FILTER_LZMA;
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opt_subblock.subfilter_options.options = &opt_lzma;
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opt_subblock.subfilter_options.id = LZMA_FILTER_DELTA;
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opt_subblock.subfilter_options.options = &opt_delta;
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lzma_filter filters[LZMA_BLOCK_FILTERS_MAX + 1];
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filters[0].id = LZMA_FILTER_LZMA2;
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filters[0].options = &opt_lzma;
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filters[1].id = LZMA_VLI_VALUE_UNKNOWN;
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// Init
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if (lzma_stream_encoder(&strm, filters, LZMA_CHECK_CRC32) != LZMA_OK) {
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fprintf(stderr, "init failed\n");
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exit(1);
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}
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// Encoding
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/*
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encode(0, LZMA_SYNC_FLUSH);
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encode(6, LZMA_SYNC_FLUSH);
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encode(0, LZMA_SYNC_FLUSH);
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encode(7, LZMA_SYNC_FLUSH);
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encode(0, LZMA_SYNC_FLUSH);
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encode(0, LZMA_FINISH);
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*/
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encode(53, LZMA_SYNC_FLUSH);
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// opt_lzma.literal_context_bits = 2;
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// opt_lzma.literal_pos_bits = 1;
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// opt_lzma.pos_bits = 0;
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encode(404, LZMA_FINISH);
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// Clean up
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lzma_end(&strm);
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return 0;
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// Prevent useless warnings so we don't need to have special CFLAGS
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// to disable -Werror.
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(void)opt_lzma;
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(void)opt_subblock;
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(void)opt_delta;
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}
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