debug/sync_flush.c

   1 ///////////////////////////////////////////////////////////////////////////////
   2 //
   3 /// \file       sync_flush.c
   4 /// \brief      Encode files using LZMA_SYNC_FLUSH
   5 //
   6 //  Copyright (C) 2008 Lasse Collin
   7 //
   8 //  This library is free software; you can redistribute it and/or
   9 //  modify it under the terms of the GNU Lesser General Public
  10 //  License as published by the Free Software Foundation; either
  11 //  version 2.1 of the License, or (at your option) any later version.
  12 //
  13 //  This library is distributed in the hope that it will be useful,
  14 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16 //  Lesser General Public License for more details.
  17 //
  18 ///////////////////////////////////////////////////////////////////////////////
  19
  20 #include "sysdefs.h"
  21 #include <stdio.h>
  22
  23
  24 static lzma_stream strm = LZMA_STREAM_INIT;
  25 static FILE *file_in;
  26
  27
  28 static void
  29 encode(size_t size, lzma_action action)
  30 {
  31         static const size_t CHUNK = 64;
  32         uint8_t in[CHUNK];
  33         uint8_t out[CHUNK];
  34         lzma_ret ret;
  35
  36         do {
  37                 if (strm.avail_in == 0 && size > 0) {
  38                         const size_t amount = MIN(size, CHUNK);
  39                         strm.avail_in = fread(in, 1, amount, file_in);
  40                         strm.next_in = in;
  41                         size -= amount; // Intentionally not using avail_in.
  42                 }
  43
  44                 strm.next_out = out;
  45                 strm.avail_out = CHUNK;
  46
  47                 ret = lzma_code(&strm, size == 0 ? action : LZMA_RUN);
  48
  49                 if (ret != LZMA_OK && ret != LZMA_STREAM_END) {
  50                         fprintf(stderr, "%s:%u: %s: ret == %d\n",
  51                                         __FILE__, __LINE__, __func__, ret);
  52                         exit(1);
  53                 }
  54
  55                 fwrite(out, 1, CHUNK - strm.avail_out, stdout);
  56
  57         } while (size > 0 || strm.avail_out == 0);
  58
  59         if ((action == LZMA_RUN && ret != LZMA_OK)
  60                         || (action != LZMA_RUN && ret != LZMA_STREAM_END)) {
  61                 fprintf(stderr, "%s:%u: %s: ret == %d\n",
  62                                 __FILE__, __LINE__, __func__, ret);
  63                 exit(1);
  64         }
  65 }
  66
  67
  68 int
  69 main(int argc, char **argv)
  70 {
  71         lzma_init_encoder();
  72
  73         file_in = argc > 1 ? fopen(argv[1], "rb") : stdin;
  74
  75         // Config
  76         lzma_options_lzma opt_lzma = {
  77                 .dictionary_size = 1 << 16,
  78                 .literal_context_bits = LZMA_LITERAL_CONTEXT_BITS_DEFAULT,
  79                 .literal_pos_bits = LZMA_LITERAL_POS_BITS_DEFAULT,
  80                 .pos_bits = LZMA_POS_BITS_DEFAULT,
  81                 .preset_dictionary = NULL,
  82                 .mode = LZMA_MODE_BEST,
  83                 .fast_bytes = 32,
  84                 .match_finder = LZMA_MF_BT3,
  85                 .match_finder_cycles = 0,
  86         };
  87
  88         lzma_options_delta opt_delta = {
  89                 .distance = 16
  90         };
  91
  92         lzma_options_subblock opt_subblock = {
  93                 .allow_subfilters = true,
  94                 .alignment = 8, // LZMA_SUBBLOCK_ALIGNMENT_DEFAULT,
  95                 .subblock_data_size = LZMA_SUBBLOCK_DATA_SIZE_DEFAULT,
  96                 .rle = 1, // LZMA_SUBBLOCK_RLE_OFF,
  97                 .subfilter_mode = LZMA_SUBFILTER_SET,
  98         };
  99         opt_subblock.subfilter_options.id = LZMA_FILTER_LZMA;
 100         opt_subblock.subfilter_options.options = &opt_lzma;
 101         opt_subblock.subfilter_options.id = LZMA_FILTER_DELTA;
 102         opt_subblock.subfilter_options.options = &opt_delta;
 103
 104         lzma_options_stream opt_stream = {
 105                 .check = LZMA_CHECK_NONE,
 106                 .has_crc32 = false,
 107                 .uncompressed_size = LZMA_VLI_VALUE_UNKNOWN,
 108                 .alignment = 0,
 109         };
 110         opt_stream.filters[0].id = LZMA_FILTER_SUBBLOCK;
 111         opt_stream.filters[0].options = &opt_subblock;
 112         opt_stream.filters[1].id = LZMA_VLI_VALUE_UNKNOWN;
 113
 114         // Init
 115         if (lzma_stream_encoder_single(&strm, &opt_stream) != LZMA_OK) {
 116                 fprintf(stderr, "init failed\n");
 117                 exit(1);
 118         }
 119
 120         // Encoding
 121         encode(0, LZMA_SYNC_FLUSH);
 122         encode(6, LZMA_SYNC_FLUSH);
 123         encode(0, LZMA_SYNC_FLUSH);
 124         encode(6, LZMA_SYNC_FLUSH);
 125         encode(0, LZMA_SYNC_FLUSH);
 126         encode(0, LZMA_FINISH);
 127
 128         // Clean up
 129         lzma_end(&strm);
 130
 131         return 0;
 132
 133         // Prevent useless warnings so we don't need to have special CFLAGS
 134         // to disable -Werror.
 135         (void)opt_lzma;
 136         (void)opt_subblock;
 137         (void)opt_delta;
 138 }