1 ///////////////////////////////////////////////////////////////////////////////
4 /// \brief Encode files using LZMA_SYNC_FLUSH
6 // Copyright (C) 2008 Lasse Collin
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.
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.
18 ///////////////////////////////////////////////////////////////////////////////
24 static lzma_stream strm = LZMA_STREAM_INIT;
29 encode(size_t size, lzma_action action)
31 static const size_t CHUNK = 64;
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);
41 size -= amount; // Intentionally not using avail_in.
45 strm.avail_out = CHUNK;
47 ret = lzma_code(&strm, size == 0 ? action : LZMA_RUN);
49 if (ret != LZMA_OK && ret != LZMA_STREAM_END) {
50 fprintf(stderr, "%s:%u: %s: ret == %d\n",
51 __FILE__, __LINE__, __func__, ret);
55 fwrite(out, 1, CHUNK - strm.avail_out, stdout);
57 } while (size > 0 || strm.avail_out == 0);
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);
69 main(int argc, char **argv)
71 file_in = argc > 1 ? fopen(argv[1], "rb") : stdin;
74 lzma_options_lzma opt_lzma = {
75 .dict_size = 1U << 16,
76 .lc = LZMA_LC_DEFAULT,
77 .lp = LZMA_LP_DEFAULT,
78 .pb = LZMA_PB_DEFAULT,
81 .mode = LZMA_MODE_NORMAL,
87 lzma_options_delta opt_delta = {
91 lzma_options_subblock opt_subblock = {
92 .allow_subfilters = true,
93 .alignment = 8, // LZMA_SUBBLOCK_ALIGNMENT_DEFAULT,
94 .subblock_data_size = LZMA_SUBBLOCK_DATA_SIZE_DEFAULT,
95 .rle = 1, // LZMA_SUBBLOCK_RLE_OFF,
96 .subfilter_mode = LZMA_SUBFILTER_SET,
98 opt_subblock.subfilter_options.id = LZMA_FILTER_LZMA1;
99 opt_subblock.subfilter_options.options = &opt_lzma;
100 opt_subblock.subfilter_options.id = LZMA_FILTER_DELTA;
101 opt_subblock.subfilter_options.options = &opt_delta;
103 lzma_filter filters[LZMA_FILTERS_MAX + 1];
104 filters[0].id = LZMA_FILTER_LZMA2;
105 filters[0].options = &opt_lzma;
106 filters[1].id = LZMA_VLI_UNKNOWN;
109 if (lzma_stream_encoder(&strm, filters, LZMA_CHECK_CRC32) != LZMA_OK) {
110 fprintf(stderr, "init failed\n");
116 encode(0, LZMA_SYNC_FLUSH);
117 encode(6, LZMA_SYNC_FLUSH);
118 encode(0, LZMA_SYNC_FLUSH);
119 encode(7, LZMA_SYNC_FLUSH);
120 encode(0, LZMA_SYNC_FLUSH);
121 encode(0, LZMA_FINISH);
123 encode(53, LZMA_SYNC_FLUSH);
124 // opt_lzma.literal_context_bits = 2;
125 // opt_lzma.literal_pos_bits = 1;
126 // opt_lzma.pos_bits = 0;
127 encode(404, LZMA_FINISH);
134 // Prevent useless warnings so we don't need to have special CFLAGS
135 // to disable -Werror.