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74 lines
2.3 KiB
C
74 lines
2.3 KiB
C
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///////////////////////////////////////////////////////////////////////////////
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//
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/// \file block_header.c
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/// \brief Utility functions to handle lzma_options_block
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//
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// Copyright (C) 2008 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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extern LZMA_API lzma_ret
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lzma_block_total_size_set(lzma_options_block *options, lzma_vli total_size)
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{
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// Validate.
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if (options->header_size < LZMA_BLOCK_HEADER_SIZE_MIN
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|| options->header_size > LZMA_BLOCK_HEADER_SIZE_MAX
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|| (options->header_size & 3)
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|| (unsigned)(options->check) > LZMA_CHECK_ID_MAX
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|| (total_size & 3))
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return LZMA_PROG_ERROR;
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const uint32_t container_size = options->header_size
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+ lzma_check_sizes[options->check];
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// Validate that Compressed Size will be greater than zero.
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if (container_size <= total_size)
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return LZMA_DATA_ERROR;
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options->compressed_size = total_size - container_size;
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return LZMA_OK;
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}
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extern LZMA_API lzma_vli
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lzma_block_total_size_get(const lzma_options_block *options)
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{
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// Validate the values that we are interested in.
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if (options->header_size < LZMA_BLOCK_HEADER_SIZE_MIN
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|| options->header_size > LZMA_BLOCK_HEADER_SIZE_MAX
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|| (options->header_size & 3)
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|| (unsigned)(options->check) > LZMA_CHECK_ID_MAX)
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return 0;
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// If Compressed Size is unknown, return that we cannot know
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// Total Size either.
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if (options->compressed_size == LZMA_VLI_VALUE_UNKNOWN)
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return LZMA_VLI_VALUE_UNKNOWN;
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const lzma_vli total_size = options->compressed_size
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+ options->header_size
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+ lzma_check_sizes[options->check];
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// Validate the calculated Total Size.
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if (options->compressed_size > LZMA_VLI_VALUE_MAX
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|| (options->compressed_size & 3)
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|| total_size > LZMA_VLI_VALUE_MAX)
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return 0;
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return total_size;
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}
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