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///////////////////////////////////////////////////////////////////////////////
//
/// \file block_header.c
/// \brief Utility functions to handle lzma_block
//
// 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 "common.h"
#include "index.h"
extern LZMA_API lzma_ret
lzma_block_compressed_size(lzma_block *options, lzma_vli total_size)
{
// Validate.
if (options->header_size < LZMA_BLOCK_HEADER_SIZE_MIN
|| options->header_size > LZMA_BLOCK_HEADER_SIZE_MAX
|| (options->header_size & 3)
|| (unsigned)(options->check) > LZMA_CHECK_ID_MAX
|| (total_size & 3))
return LZMA_PROG_ERROR;
const uint32_t container_size = options->header_size
+ lzma_check_size(options->check);
// Validate that Compressed Size will be greater than zero.
if (container_size <= total_size)
return LZMA_DATA_ERROR;
options->compressed_size = total_size - container_size;
return LZMA_OK;
}
extern LZMA_API lzma_vli
lzma_block_unpadded_size(const lzma_block *options)
{
// Validate the values that we are interested in i.e. all but
// Uncompressed Size and the filters.
//
// NOTE: This function is used for validation too, so it is
// essential that these checks are always done even if
// Compressed Size is unknown.
if (options->header_size < LZMA_BLOCK_HEADER_SIZE_MIN
|| options->header_size > LZMA_BLOCK_HEADER_SIZE_MAX
|| (options->header_size & 3)
|| !lzma_vli_is_valid(options->compressed_size)
|| options->compressed_size == 0
|| (unsigned int)(options->check) > LZMA_CHECK_ID_MAX)
return 0;
// If Compressed Size is unknown, return that we cannot know
// size of the Block either.
if (options->compressed_size == LZMA_VLI_UNKNOWN)
return LZMA_VLI_UNKNOWN;
// Calculate Unpadded Size and validate it.
const lzma_vli unpadded_size = options->compressed_size
+ options->header_size
+ lzma_check_size(options->check);
assert(unpadded_size >= UNPADDED_SIZE_MIN);
if (unpadded_size > UNPADDED_SIZE_MAX)
return 0;
return unpadded_size;
}
extern LZMA_API lzma_vli
lzma_block_total_size(const lzma_block *options)
{
lzma_vli unpadded_size = lzma_block_unpadded_size(options);
if (unpadded_size != 0 && unpadded_size != LZMA_VLI_UNKNOWN)
unpadded_size = vli_ceil4(unpadded_size);
return unpadded_size;
}
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