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///////////////////////////////////////////////////////////////////////////////
//
/// \file full_flush.c
/// \brief Encode files using LZMA_FULL_FLUSH
//
// Author: Lasse Collin
//
// This file has been put into the public domain.
// You can do whatever you want with this file.
//
///////////////////////////////////////////////////////////////////////////////
#include "sysdefs.h"
#include "lzma.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)
{
file_in = argc > 1 ? fopen(argv[1], "rb") : stdin;
// Config
lzma_options_lzma opt_lzma;
if (lzma_lzma_preset(&opt_lzma, 1)) {
fprintf(stderr, "preset failed\n");
exit(1);
}
lzma_filter filters[LZMA_FILTERS_MAX + 1];
filters[0].id = LZMA_FILTER_LZMA2;
filters[0].options = &opt_lzma;
filters[1].id = LZMA_VLI_UNKNOWN;
// Init
if (lzma_stream_encoder(&strm, filters, LZMA_CHECK_CRC32) != LZMA_OK) {
fprintf(stderr, "init failed\n");
exit(1);
}
// if (lzma_easy_encoder(&strm, 1)) {
// fprintf(stderr, "init failed\n");
// exit(1);
// }
// Encoding
encode(0, LZMA_FULL_FLUSH);
encode(6, LZMA_FULL_FLUSH);
encode(0, LZMA_FULL_FLUSH);
encode(7, LZMA_FULL_FLUSH);
encode(0, LZMA_FULL_FLUSH);
encode(0, LZMA_FINISH);
// Clean up
lzma_end(&strm);
return 0;
}
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