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 #define CHUNK 64
  18
  19
  20 static lzma_stream strm = LZMA_STREAM_INIT;
  21 static FILE *file_in;
  22
  23
  24 static void
  25 encode(size_t size, lzma_action action)
  26 {
  27         uint8_t in[CHUNK];
  28         uint8_t out[CHUNK];
  29         lzma_ret ret;
  30
  31         do {
  32                 if (strm.avail_in == 0 && size > 0) {
  33                         const size_t amount = my_min(size, CHUNK);
  34                         strm.avail_in = fread(in, 1, amount, file_in);
  35                         strm.next_in = in;
  36                         size -= amount; // Intentionally not using avail_in.
  37                 }
  38
  39                 strm.next_out = out;
  40                 strm.avail_out = CHUNK;
  41
  42                 ret = lzma_code(&strm, size == 0 ? action : LZMA_RUN);
  43
  44                 if (ret != LZMA_OK && ret != LZMA_STREAM_END) {
  45                         fprintf(stderr, "%s:%u: %s: ret == %d\n",
  46                                         __FILE__, __LINE__, __func__, ret);
  47                         exit(1);
  48                 }
  49
  50                 fwrite(out, 1, CHUNK - strm.avail_out, stdout);
  51
  52         } while (size > 0 || strm.avail_out == 0);
  53
  54         if ((action == LZMA_RUN && ret != LZMA_OK)
  55                         || (action != LZMA_RUN && ret != LZMA_STREAM_END)) {
  56                 fprintf(stderr, "%s:%u: %s: ret == %d\n",
  57                                 __FILE__, __LINE__, __func__, ret);
  58                 exit(1);
  59         }
  60 }
  61
  62
  63 int
  64 main(int argc, char **argv)
  65 {
  66         file_in = argc > 1 ? fopen(argv[1], "rb") : stdin;
  67
  68         // Config
  69         lzma_options_lzma opt_lzma = {
  70                 .dict_size = 1U << 16,
  71                 .lc = LZMA_LC_DEFAULT,
  72                 .lp = LZMA_LP_DEFAULT,
  73                 .pb = LZMA_PB_DEFAULT,
  74                 .preset_dict = NULL,
  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_filter filters[LZMA_FILTERS_MAX + 1];
  86         filters[0].id = LZMA_FILTER_LZMA2;
  87         filters[0].options = &opt_lzma;
  88         filters[1].id = LZMA_VLI_UNKNOWN;
  89
  90         // Init
  91         if (lzma_stream_encoder(&strm, filters, LZMA_CHECK_CRC32) != LZMA_OK) {
  92                 fprintf(stderr, "init failed\n");
  93                 exit(1);
  94         }
  95
  96         // Encoding
  97         encode(0, LZMA_SYNC_FLUSH);
  98         encode(6, LZMA_SYNC_FLUSH);
  99         encode(0, LZMA_SYNC_FLUSH);
 100         encode(7, LZMA_SYNC_FLUSH);
 101         encode(0, LZMA_SYNC_FLUSH);
 102         encode(0, LZMA_FINISH);
 103
 104 /*
 105         encode(53, LZMA_SYNC_FLUSH);
 106         opt_lzma.lc = 2;
 107         opt_lzma.lp = 1;
 108         opt_lzma.pb = 0;
 109         if (lzma_filters_update(&strm, filters) != LZMA_OK) {
 110                 fprintf(stderr, "update failed\n");
 111                 exit(1);
 112         }
 113         encode(404, LZMA_FINISH);
 114 */
 115
 116         // Clean up
 117         lzma_end(&strm);
 118
 119         return 0;
 120
 121         // Prevent useless warnings so we don't need to have special CFLAGS
 122         // to disable -Werror.
 123         (void)opt_lzma;
 124         (void)opt_delta;
 125 }