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///////////////////////////////////////////////////////////////////////////////
//
/// \file easy.c
/// \brief Easy Stream encoder initialization
//
// 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 "stream_encoder.h"
struct lzma_coder_s {
lzma_next_coder stream_encoder;
/// Options for LZMA2
lzma_options_lzma opt_lzma;
/// We need to keep the filters array available in case
/// LZMA_FULL_FLUSH is used.
lzma_filter filters[LZMA_FILTERS_MAX + 1];
};
static bool
easy_set_filters(lzma_coder *coder, uint32_t preset)
{
if (lzma_lzma_preset(&coder->opt_lzma, preset))
return true;
coder->filters[0].id = LZMA_FILTER_LZMA2;
coder->filters[0].options = &coder->opt_lzma;
coder->filters[1].id = LZMA_VLI_UNKNOWN;
return false;
}
static lzma_ret
easy_encode(lzma_coder *coder, lzma_allocator *allocator,
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)
{
return coder->stream_encoder.code(
coder->stream_encoder.coder, allocator,
in, in_pos, in_size, out, out_pos, out_size, action);
}
static void
easy_encoder_end(lzma_coder *coder, lzma_allocator *allocator)
{
lzma_next_end(&coder->stream_encoder, allocator);
lzma_free(coder, allocator);
return;
}
static lzma_ret
easy_encoder_init(lzma_next_coder *next, lzma_allocator *allocator,
uint32_t preset, lzma_check check)
{
lzma_next_coder_init(easy_encoder_init, next, allocator);
if (next->coder == NULL) {
next->coder = lzma_alloc(sizeof(lzma_coder), allocator);
if (next->coder == NULL)
return LZMA_MEM_ERROR;
next->code = &easy_encode;
next->end = &easy_encoder_end;
next->coder->stream_encoder = LZMA_NEXT_CODER_INIT;
}
if (easy_set_filters(next->coder, preset))
return LZMA_OPTIONS_ERROR;
return lzma_stream_encoder_init(&next->coder->stream_encoder,
allocator, next->coder->filters, check);
}
extern LZMA_API(lzma_ret)
lzma_easy_encoder(lzma_stream *strm, uint32_t preset, lzma_check check)
{
lzma_next_strm_init(easy_encoder_init, strm, preset, check);
strm->internal->supported_actions[LZMA_RUN] = true;
strm->internal->supported_actions[LZMA_SYNC_FLUSH] = true;
strm->internal->supported_actions[LZMA_FULL_FLUSH] = true;
strm->internal->supported_actions[LZMA_FINISH] = true;
return LZMA_OK;
}
extern LZMA_API(uint64_t)
lzma_easy_encoder_memusage(uint32_t preset)
{
lzma_coder coder;
if (easy_set_filters(&coder, preset))
return UINT32_MAX;
return lzma_raw_encoder_memusage(coder.filters);
}
extern LZMA_API(uint64_t)
lzma_easy_decoder_memusage(uint32_t preset)
{
lzma_coder coder;
if (easy_set_filters(&coder, preset))
return UINT32_MAX;
return lzma_raw_decoder_memusage(coder.filters);
}
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