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///////////////////////////////////////////////////////////////////////////////
//
/// \file subblock_decoder_helper.c
/// \brief Helper filter for the Subblock decoder
///
/// This filter is used to indicate End of Input for subfilters needing it.
//
// 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 "subblock_decoder_helper.h"
struct lzma_coder_s {
const lzma_options_subblock_helper *options;
};
static lzma_ret
helper_decode(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 lzma_attribute((unused)))
{
// If end_was_reached is true, we cannot have any input.
assert(!coder->options->end_was_reached || *in_pos == in_size);
// We can safely copy as much as possible, because we are never
// given more data than a single Subblock Data field.
bufcpy(in, in_pos, in_size, out, out_pos, out_size);
// Return LZMA_STREAM_END when instructed so by the Subblock decoder.
return coder->options->end_was_reached ? LZMA_STREAM_END : LZMA_OK;
}
static void
helper_end(lzma_coder *coder, lzma_allocator *allocator)
{
lzma_free(coder, allocator);
return;
}
extern lzma_ret
lzma_subblock_decoder_helper_init(lzma_next_coder *next,
lzma_allocator *allocator, const lzma_filter_info *filters)
{
// This is always the last filter in the chain.
assert(filters[1].init == NULL);
// We never know uncompressed size.
assert(filters[0].uncompressed_size == LZMA_VLI_VALUE_UNKNOWN);
if (next->coder == NULL) {
next->coder = lzma_alloc(sizeof(lzma_coder), allocator);
if (next->coder == NULL)
return LZMA_MEM_ERROR;
next->code = &helper_decode;
next->end = &helper_end;
}
next->coder->options = filters[0].options;
return LZMA_OK;
}
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