debug/sync_flush.c

   1 ///////////////////////////////////////////////////////////////////////////////
   2 //
   3 /// \file       sync_flush.c
   4 /// \brief      Encode files using LZMA_SYNC_FLUSH
   5 //
   6 //  Author:     Lasse Collin
   7 //
   8 //  This file has been put into the public domain.
   9 //  You can do whatever you want with this file.
  10 //
  11 ///////////////////////////////////////////////////////////////////////////////
  12
  13 #include "sysdefs.h"
  14 #include "lzma.h"
  15 #include <stdio.h>
  16
  17
  18 static lzma_stream strm = LZMA_STREAM_INIT;
  19 static FILE *file_in;
  20
  21
  22 static void
  23 encode(size_t size, lzma_action action)
  24 {
  25         static const size_t CHUNK = 64;
  26         uint8_t in[CHUNK];
  27         uint8_t out[CHUNK];
  28         lzma_ret ret;
  29
  30         do {
  31                 if (strm.avail_in == 0 && size > 0) {
  32                         const size_t amount = MIN(size, CHUNK);
  33                         strm.avail_in = fread(in, 1, amount, file_in);
  34                         strm.next_in = in;
  35                         size -= amount; // Intentionally not using avail_in.
  36                 }
  37
  38                 strm.next_out = out;
  39                 strm.avail_out = CHUNK;
  40
  41                 ret = lzma_code(&strm, size == 0 ? action : LZMA_RUN);
  42
  43                 if (ret != LZMA_OK && ret != LZMA_STREAM_END) {
  44                         fprintf(stderr, "%s:%u: %s: ret == %d\n",
  45                                         __FILE__, __LINE__, __func__, ret);
  46                         exit(1);
  47                 }
  48
  49                 fwrite(out, 1, CHUNK - strm.avail_out, stdout);
  50
  51         } while (size > 0 || strm.avail_out == 0);
  52
  53         if ((action == LZMA_RUN && ret != LZMA_OK)
  54                         || (action != LZMA_RUN && ret != LZMA_STREAM_END)) {
  55                 fprintf(stderr, "%s:%u: %s: ret == %d\n",
  56                                 __FILE__, __LINE__, __func__, ret);
  57                 exit(1);
  58         }
  59 }
  60
  61
  62 int
  63 main(int argc, char **argv)
  64 {
  65         file_in = argc > 1 ? fopen(argv[1], "rb") : stdin;
  66
  67         // Config
  68         lzma_options_lzma opt_lzma = {
  69                 .dict_size = 1U << 16,
  70                 .lc = LZMA_LC_DEFAULT,
  71                 .lp = LZMA_LP_DEFAULT,
  72                 .pb = LZMA_PB_DEFAULT,
  73                 .preset_dict = NULL,
  74                 .persistent = true,
  75                 .mode = LZMA_MODE_NORMAL,
  76                 .nice_len = 32,
  77                 .mf = LZMA_MF_HC3,
  78                 .depth = 0,
  79         };
  80
  81         lzma_options_delta opt_delta = {
  82                 .dist = 16
  83         };
  84
  85         lzma_options_subblock opt_subblock = {
  86                 .allow_subfilters = true,
  87                 .alignment = 8, // LZMA_SUBBLOCK_ALIGNMENT_DEFAULT,
  88                 .subblock_data_size = LZMA_SUBBLOCK_DATA_SIZE_DEFAULT,
  89                 .rle = 1, // LZMA_SUBBLOCK_RLE_OFF,
  90                 .subfilter_mode = LZMA_SUBFILTER_SET,
  91         };
  92         opt_subblock.subfilter_options.id = LZMA_FILTER_LZMA1;
  93         opt_subblock.subfilter_options.options = &opt_lzma;
  94         opt_subblock.subfilter_options.id = LZMA_FILTER_DELTA;
  95         opt_subblock.subfilter_options.options = &opt_delta;
  96
  97         lzma_filter filters[LZMA_FILTERS_MAX + 1];
  98         filters[0].id = LZMA_FILTER_LZMA2;
  99         filters[0].options = &opt_lzma;
 100         filters[1].id = LZMA_VLI_UNKNOWN;
 101
 102         // Init
 103         if (lzma_stream_encoder(&strm, filters, LZMA_CHECK_CRC32) != LZMA_OK) {
 104                 fprintf(stderr, "init failed\n");
 105                 exit(1);
 106         }
 107
 108         // Encoding
 109
 110         encode(0, LZMA_SYNC_FLUSH);
 111         encode(6, LZMA_SYNC_FLUSH);
 112         encode(0, LZMA_SYNC_FLUSH);
 113         encode(7, LZMA_SYNC_FLUSH);
 114         encode(0, LZMA_SYNC_FLUSH);
 115         encode(0, LZMA_FINISH);
 116 /*
 117         encode(53, LZMA_SYNC_FLUSH);
 118 //      opt_lzma.literal_context_bits = 2;
 119 //      opt_lzma.literal_pos_bits = 1;
 120 //      opt_lzma.pos_bits = 0;
 121         encode(404, LZMA_FINISH);
 122 */
 123         // Clean up
 124         lzma_end(&strm);
 125
 126         return 0;
 127
 128         // Prevent useless warnings so we don't need to have special CFLAGS
 129         // to disable -Werror.
 130         (void)opt_lzma;
 131         (void)opt_subblock;
 132         (void)opt_delta;
 133 }