mirror of https://git.tukaani.org/xz.git
168 lines
3.9 KiB
C
168 lines
3.9 KiB
C
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///////////////////////////////////////////////////////////////////////////////
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//
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/// \file alone_decoder.c
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/// \brief Decoder for LZMA_Alone files
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//
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// Copyright (C) 2007 Lasse Collin
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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///////////////////////////////////////////////////////////////////////////////
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#include "common.h"
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#include "lzma_encoder.h"
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struct lzma_coder_s {
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lzma_next_coder next;
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enum {
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SEQ_PROPERTIES,
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SEQ_DICTIONARY_SIZE,
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SEQ_UNCOMPRESSED_SIZE,
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SEQ_CODE,
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} sequence;
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size_t pos;
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lzma_options_alone options;
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};
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static lzma_ret
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alone_encode(lzma_coder *coder,
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lzma_allocator *allocator lzma_attribute((unused)),
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const uint8_t *restrict in, size_t *restrict in_pos,
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size_t in_size, uint8_t *restrict out,
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size_t *restrict out_pos, size_t out_size,
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lzma_action action)
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{
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while (*out_pos < out_size)
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switch (coder->sequence) {
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case SEQ_PROPERTIES:
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if (lzma_lzma_encode_properties(
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&coder->options.lzma, out + *out_pos)) {
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return LZMA_PROG_ERROR;
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}
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coder->sequence = SEQ_DICTIONARY_SIZE;
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++*out_pos;
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break;
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case SEQ_DICTIONARY_SIZE:
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out[*out_pos] = coder->options.lzma.dictionary_size
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>> (coder->pos * 8);
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if (++coder->pos == 4) {
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coder->pos = 0;
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coder->sequence = SEQ_UNCOMPRESSED_SIZE;
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}
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++*out_pos;
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break;
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case SEQ_UNCOMPRESSED_SIZE:
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out[*out_pos] = coder->options.uncompressed_size
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>> (coder->pos * 8);
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if (++coder->pos == 8) {
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coder->pos = 0;
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coder->sequence = SEQ_CODE;
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}
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++*out_pos;
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break;
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case SEQ_CODE: {
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return coder->next.code(coder->next.coder,
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allocator, in, in_pos, in_size,
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out, out_pos, out_size, action);
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}
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default:
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return LZMA_PROG_ERROR;
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}
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return LZMA_OK;
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}
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static void
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alone_encoder_end(lzma_coder *coder, lzma_allocator *allocator)
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{
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lzma_next_coder_end(&coder->next, allocator);
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lzma_free(coder, allocator);
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return;
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}
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// At least for now, this is not used by any internal function.
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static lzma_ret
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alone_encoder_init(lzma_next_coder *next, lzma_allocator *allocator,
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const lzma_options_alone *options)
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{
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if (next->coder == NULL) {
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next->coder = lzma_alloc(sizeof(lzma_coder), allocator);
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if (next->coder == NULL)
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return LZMA_MEM_ERROR;
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next->code = &alone_encode;
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next->end = &alone_encoder_end;
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next->coder->next = LZMA_NEXT_CODER_INIT;
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}
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// Initialize the LZMA_Alone coder variables.
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next->coder->sequence = SEQ_PROPERTIES;
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next->coder->pos = 0;
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next->coder->options = *options;
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// Verify uncompressed_size since the other functions assume that
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// it is valid.
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if (!lzma_vli_is_valid(next->coder->options.uncompressed_size))
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return LZMA_PROG_ERROR;
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// Initialize the LZMA encoder.
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const lzma_filter_info filters[2] = {
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{
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.init = &lzma_lzma_encoder_init,
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.options = &next->coder->options.lzma,
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.uncompressed_size = next->coder->options
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.uncompressed_size,
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}, {
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.init = NULL,
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}
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};
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return lzma_next_filter_init(&next->coder->next, allocator, filters);
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}
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/*
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extern lzma_ret
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lzma_alone_encoder_init(lzma_next_coder *next, lzma_allocator *allocator,
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const lzma_options_alone *options)
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{
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lzma_next_coder_init(alone_encoder_init, next, allocator, options);
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}
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*/
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extern LZMA_API lzma_ret
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lzma_alone_encoder(lzma_stream *strm, const lzma_options_alone *options)
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{
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lzma_next_strm_init(strm, alone_encoder_init, options);
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strm->internal->supported_actions[LZMA_RUN] = true;
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strm->internal->supported_actions[LZMA_FINISH] = true;
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return LZMA_OK;
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}
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