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///////////////////////////////////////////////////////////////////////////////
//
/// \file sync_flush.c
/// \brief Encode files using LZMA_SYNC_FLUSH
//
// Copyright (C) 2008 Lasse Collin
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
///////////////////////////////////////////////////////////////////////////////
#include "sysdefs.h"
#include <stdio.h>
static lzma_stream strm = LZMA_STREAM_INIT;
static FILE *file_in;
static void
encode(size_t size, lzma_action action)
{
static const size_t CHUNK = 64;
uint8_t in[CHUNK];
uint8_t out[CHUNK];
lzma_ret ret;
do {
if (strm.avail_in == 0 && size > 0) {
const size_t amount = MIN(size, CHUNK);
strm.avail_in = fread(in, 1, amount, file_in);
strm.next_in = in;
size -= amount; // Intentionally not using avail_in.
}
strm.next_out = out;
strm.avail_out = CHUNK;
ret = lzma_code(&strm, size == 0 ? action : LZMA_RUN);
if (ret != LZMA_OK && ret != LZMA_STREAM_END) {
fprintf(stderr, "%s:%u: %s: ret == %d\n",
__FILE__, __LINE__, __func__, ret);
exit(1);
}
fwrite(out, 1, CHUNK - strm.avail_out, stdout);
} while (size > 0 || strm.avail_out == 0);
if ((action == LZMA_RUN && ret != LZMA_OK)
|| (action != LZMA_RUN && ret != LZMA_STREAM_END)) {
fprintf(stderr, "%s:%u: %s: ret == %d\n",
__FILE__, __LINE__, __func__, ret);
exit(1);
}
}
int
main(int argc, char **argv)
{
lzma_init_encoder();
file_in = argc > 1 ? fopen(argv[1], "rb") : stdin;
// Config
lzma_options_lzma opt_lzma = {
.dictionary_size = 1 << 16,
.literal_context_bits = LZMA_LITERAL_CONTEXT_BITS_DEFAULT,
.literal_pos_bits = LZMA_LITERAL_POS_BITS_DEFAULT,
.pos_bits = LZMA_POS_BITS_DEFAULT,
.preset_dictionary = NULL,
.mode = LZMA_MODE_BEST,
.fast_bytes = 32,
.match_finder = LZMA_MF_BT3,
.match_finder_cycles = 0,
};
lzma_options_delta opt_delta = {
.distance = 16
};
lzma_options_subblock opt_subblock = {
.allow_subfilters = true,
.alignment = 8, // LZMA_SUBBLOCK_ALIGNMENT_DEFAULT,
.subblock_data_size = LZMA_SUBBLOCK_DATA_SIZE_DEFAULT,
.rle = 1, // LZMA_SUBBLOCK_RLE_OFF,
.subfilter_mode = LZMA_SUBFILTER_SET,
};
opt_subblock.subfilter_options.id = LZMA_FILTER_LZMA;
opt_subblock.subfilter_options.options = &opt_lzma;
opt_subblock.subfilter_options.id = LZMA_FILTER_DELTA;
opt_subblock.subfilter_options.options = &opt_delta;
lzma_options_stream opt_stream = {
.check = LZMA_CHECK_NONE,
.has_crc32 = false,
.uncompressed_size = LZMA_VLI_VALUE_UNKNOWN,
.alignment = 0,
};
opt_stream.filters[0].id = LZMA_FILTER_SUBBLOCK;
opt_stream.filters[0].options = &opt_subblock;
opt_stream.filters[1].id = LZMA_VLI_VALUE_UNKNOWN;
// Init
if (lzma_stream_encoder_single(&strm, &opt_stream) != LZMA_OK) {
fprintf(stderr, "init failed\n");
exit(1);
}
// Encoding
encode(0, LZMA_SYNC_FLUSH);
encode(6, LZMA_SYNC_FLUSH);
encode(0, LZMA_SYNC_FLUSH);
encode(6, LZMA_SYNC_FLUSH);
encode(0, LZMA_SYNC_FLUSH);
encode(0, LZMA_FINISH);
// Clean up
lzma_end(&strm);
return 0;
// Prevent useless warnings so we don't need to have special CFLAGS
// to disable -Werror.
(void)opt_lzma;
(void)opt_subblock;
(void)opt_delta;
}
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