sync_flush.c

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//
//
//  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>
 
#define CHUNK 64
 
 
static lzma_stream strm = LZMA_STREAM_INIT;
static FILE *file_in;
 
 
static void
encode(size_t size, lzma_action action)
{
    uint8_t in[CHUNK];
    uint8_t out[CHUNK];
    lzma_ret ret;
 
    do {
        if (strm.avail_in == 0 && size > 0) {
            const size_t amount = my_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 = {
        .dict_size = 1U << 16,
        .lc = LZMA_LC_DEFAULT,
        .lp = LZMA_LP_DEFAULT,
        .pb = LZMA_PB_DEFAULT,
        .preset_dict = NULL,
        .mode = LZMA_MODE_NORMAL,
        .nice_len = 32,
        .mf = LZMA_MF_HC3,
        .depth = 0,
    };
 
    lzma_options_delta opt_delta = {
        .dist = 16
    };
 
    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);
    }
 
    // Encoding
    encode(0, LZMA_SYNC_FLUSH);
    encode(6, LZMA_SYNC_FLUSH);
    encode(0, LZMA_SYNC_FLUSH);
    encode(7, LZMA_SYNC_FLUSH);
    encode(0, LZMA_SYNC_FLUSH);
    encode(0, LZMA_FINISH);
 
/*
    encode(53, LZMA_SYNC_FLUSH);
    opt_lzma.lc = 2;
    opt_lzma.lp = 1;
    opt_lzma.pb = 0;
    if (lzma_filters_update(&strm, filters) != LZMA_OK) {
        fprintf(stderr, "update failed\n");
        exit(1);
    }
    encode(404, 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_delta;
}