| /////////////////////////////////////////////////////////////////////////////// |
| // |
| /// \file sync_flush.c |
| /// \brief Encode files using LZMA_SYNC_FLUSH |
| // |
| // Copyright (C) 2008 Lasse Collin |
| // |
| // This library is free software; you can redistribute it and/or |
| // modify it under the terms of the GNU Lesser General Public |
| // License as published by the Free Software Foundation; either |
| // version 2.1 of the License, or (at your option) any later version. |
| // |
| // This library is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| // Lesser General Public License for more details. |
| // |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| #include "sysdefs.h" |
| #include <stdio.h> |
| |
| |
| static lzma_stream strm = LZMA_STREAM_INIT; |
| static FILE *file_in; |
| |
| |
| static void |
| encode(size_t size, lzma_action action) |
| { |
| static const size_t CHUNK = 64; |
| uint8_t in[CHUNK]; |
| uint8_t out[CHUNK]; |
| lzma_ret ret; |
| |
| do { |
| if (strm.avail_in == 0 && size > 0) { |
| const size_t amount = 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) |
| { |
| lzma_init_encoder(); |
| |
| file_in = argc > 1 ? fopen(argv[1], "rb") : stdin; |
| |
| // Config |
| lzma_options_lzma opt_lzma = { |
| .dictionary_size = 1 << 16, |
| .literal_context_bits = LZMA_LITERAL_CONTEXT_BITS_DEFAULT, |
| .literal_pos_bits = LZMA_LITERAL_POS_BITS_DEFAULT, |
| .pos_bits = LZMA_POS_BITS_DEFAULT, |
| .preset_dictionary = NULL, |
| .persistent = true, |
| .mode = LZMA_MODE_NORMAL, |
| .fast_bytes = 32, |
| .match_finder = LZMA_MF_HC3, |
| .match_finder_cycles = 0, |
| }; |
| |
| lzma_options_delta opt_delta = { |
| .distance = 16 |
| }; |
| |
| lzma_options_subblock opt_subblock = { |
| .allow_subfilters = true, |
| .alignment = 8, // LZMA_SUBBLOCK_ALIGNMENT_DEFAULT, |
| .subblock_data_size = LZMA_SUBBLOCK_DATA_SIZE_DEFAULT, |
| .rle = 1, // LZMA_SUBBLOCK_RLE_OFF, |
| .subfilter_mode = LZMA_SUBFILTER_SET, |
| }; |
| opt_subblock.subfilter_options.id = LZMA_FILTER_LZMA; |
| opt_subblock.subfilter_options.options = &opt_lzma; |
| opt_subblock.subfilter_options.id = LZMA_FILTER_DELTA; |
| opt_subblock.subfilter_options.options = &opt_delta; |
| |
| lzma_filter filters[LZMA_BLOCK_FILTERS_MAX + 1]; |
| filters[0].id = LZMA_FILTER_LZMA2; |
| filters[0].options = &opt_lzma; |
| filters[1].id = LZMA_VLI_VALUE_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.literal_context_bits = 2; |
| // opt_lzma.literal_pos_bits = 1; |
| // opt_lzma.pos_bits = 0; |
| 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_subblock; |
| (void)opt_delta; |
| } |