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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;
/// We need to keep the filters array available in case
/// LZMA_FULL_FLUSH is used.
lzma_options_filter filters[5];
};
static bool
easy_set_filters(lzma_options_filter *filters, uint32_t level)
{
bool error = false;
if (level == 0) {
// TODO FIXME Use Subblock or LZMA2 with no compression.
error = true;
#ifdef HAVE_FILTER_LZMA
} else if (level <= 9) {
filters[0].id = LZMA_FILTER_LZMA;
filters[0].options = (void *)(&lzma_preset_lzma[level - 1]);
filters[1].id = LZMA_VLI_VALUE_UNKNOWN;
#endif
} else {
error = true;
}
return error;
}
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_coder_end(&coder->stream_encoder, allocator);
lzma_free(coder, allocator);
return;
}
static lzma_ret
easy_encoder_init(lzma_next_coder *next, lzma_allocator *allocator,
lzma_easy_level level)
{
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->filters, level))
return LZMA_HEADER_ERROR;
return lzma_stream_encoder_init(&next->coder->stream_encoder,
allocator, next->coder->filters, LZMA_CHECK_CRC32);
}
extern LZMA_API lzma_ret
lzma_easy_encoder(lzma_stream *strm, lzma_easy_level level)
{
lzma_next_strm_init(strm, easy_encoder_init, level);
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 uint32_t
lzma_easy_memory_usage(lzma_easy_level level)
{
lzma_options_filter filters[5];
if (easy_set_filters(filters, level))
return UINT32_MAX;
return lzma_memory_usage(filters, true);
}
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