| /////////////////////////////////////////////////////////////////////////////// |
| // |
| /// \file alone_decoder.c |
| /// \brief Decoder for LZMA_Alone files |
| // |
| // Copyright (C) 2007 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 "common.h" |
| #include "lzma_encoder.h" |
| |
| |
| struct lzma_coder_s { |
| lzma_next_coder next; |
| |
| enum { |
| SEQ_PROPERTIES, |
| SEQ_DICTIONARY_SIZE, |
| SEQ_UNCOMPRESSED_SIZE, |
| SEQ_CODE, |
| } sequence; |
| |
| size_t pos; |
| |
| lzma_options_alone options; |
| }; |
| |
| |
| static lzma_ret |
| alone_encode(lzma_coder *coder, |
| lzma_allocator *allocator lzma_attribute((unused)), |
| const uint8_t *restrict in, size_t *restrict in_pos, |
| size_t in_size, uint8_t *restrict out, |
| size_t *restrict out_pos, size_t out_size, |
| lzma_action action) |
| { |
| while (*out_pos < out_size) |
| switch (coder->sequence) { |
| case SEQ_PROPERTIES: |
| if (lzma_lzma_encode_properties( |
| &coder->options.lzma, out + *out_pos)) { |
| return LZMA_PROG_ERROR; |
| } |
| |
| coder->sequence = SEQ_DICTIONARY_SIZE; |
| ++*out_pos; |
| break; |
| |
| case SEQ_DICTIONARY_SIZE: |
| out[*out_pos] = coder->options.lzma.dictionary_size |
| >> (coder->pos * 8); |
| |
| if (++coder->pos == 4) { |
| coder->pos = 0; |
| coder->sequence = SEQ_UNCOMPRESSED_SIZE; |
| } |
| |
| ++*out_pos; |
| break; |
| |
| case SEQ_UNCOMPRESSED_SIZE: |
| out[*out_pos] = coder->options.uncompressed_size |
| >> (coder->pos * 8); |
| |
| if (++coder->pos == 8) { |
| coder->pos = 0; |
| coder->sequence = SEQ_CODE; |
| } |
| |
| ++*out_pos; |
| break; |
| |
| case SEQ_CODE: { |
| return coder->next.code(coder->next.coder, |
| allocator, in, in_pos, in_size, |
| out, out_pos, out_size, action); |
| } |
| |
| default: |
| return LZMA_PROG_ERROR; |
| } |
| |
| return LZMA_OK; |
| } |
| |
| |
| static void |
| alone_encoder_end(lzma_coder *coder, lzma_allocator *allocator) |
| { |
| lzma_next_coder_end(&coder->next, allocator); |
| lzma_free(coder, allocator); |
| return; |
| } |
| |
| |
| // At least for now, this is not used by any internal function. |
| static lzma_ret |
| alone_encoder_init(lzma_next_coder *next, lzma_allocator *allocator, |
| const lzma_options_alone *options) |
| { |
| if (next->coder == NULL) { |
| next->coder = lzma_alloc(sizeof(lzma_coder), allocator); |
| if (next->coder == NULL) |
| return LZMA_MEM_ERROR; |
| |
| next->code = &alone_encode; |
| next->end = &alone_encoder_end; |
| next->coder->next = LZMA_NEXT_CODER_INIT; |
| } |
| |
| // Initialize the LZMA_Alone coder variables. |
| next->coder->sequence = SEQ_PROPERTIES; |
| next->coder->pos = 0; |
| next->coder->options = *options; |
| |
| // Verify uncompressed_size since the other functions assume that |
| // it is valid. |
| if (!lzma_vli_is_valid(next->coder->options.uncompressed_size)) |
| return LZMA_PROG_ERROR; |
| |
| // Initialize the LZMA encoder. |
| const lzma_filter_info filters[2] = { |
| { |
| .init = &lzma_lzma_encoder_init, |
| .options = &next->coder->options.lzma, |
| .uncompressed_size = next->coder->options |
| .uncompressed_size, |
| }, { |
| .init = NULL, |
| } |
| }; |
| |
| return lzma_next_filter_init(&next->coder->next, allocator, filters); |
| } |
| |
| |
| /* |
| extern lzma_ret |
| lzma_alone_encoder_init(lzma_next_coder *next, lzma_allocator *allocator, |
| const lzma_options_alone *options) |
| { |
| lzma_next_coder_init(alone_encoder_init, next, allocator, options); |
| } |
| */ |
| |
| |
| extern LZMA_API lzma_ret |
| lzma_alone_encoder(lzma_stream *strm, const lzma_options_alone *options) |
| { |
| lzma_next_strm_init(strm, alone_encoder_init, options); |
| |
| strm->internal->supported_actions[LZMA_RUN] = true; |
| strm->internal->supported_actions[LZMA_FINISH] = true; |
| |
| return LZMA_OK; |
| } |