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📄 alone_decoder.c(5.53 KB)
📄 alone_decoder.h(601 B)
📄 alone_encoder.c(3.66 KB)
📄 auto_decoder.c(4.79 KB)
📄 block_buffer_decoder.c(2.31 KB)
📄 block_buffer_encoder.c(9.89 KB)
📄 block_buffer_encoder.h(763 B)
📄 block_decoder.c(6.82 KB)
📄 block_decoder.h(576 B)
📄 block_encoder.c(5.63 KB)
📄 block_encoder.h(1.85 KB)
📄 block_header_decoder.c(3.62 KB)
📄 block_header_encoder.c(3.27 KB)
📄 block_util.c(2.58 KB)
📄 common.c(10.4 KB)
📄 common.h(10.22 KB)
📄 easy_buffer_encoder.c(840 B)
📄 easy_decoder_memusage.c(668 B)
📄 easy_encoder.c(678 B)
📄 easy_encoder_memusage.c(654 B)
📄 easy_preset.c(727 B)
📄 easy_preset.h(921 B)
📄 filter_buffer_decoder.c(2.45 KB)
📄 filter_buffer_encoder.c(1.5 KB)
📄 filter_common.c(8.5 KB)
📄 filter_common.h(1.23 KB)
📄 filter_decoder.c(4.32 KB)
📄 filter_decoder.h(617 B)
📄 filter_encoder.c(7.17 KB)
📄 filter_encoder.h(732 B)
📄 filter_flags_decoder.c(1.16 KB)
📄 filter_flags_encoder.c(1.37 KB)
📄 hardware_cputhreads.c(526 B)
📄 hardware_physmem.c(683 B)
📄 index.c(34.61 KB)
📄 index.h(1.93 KB)
📄 index_decoder.c(8.4 KB)
📄 index_encoder.c(5.72 KB)
📄 index_encoder.h(584 B)
📄 index_hash.c(8.77 KB)
📄 memcmplen.h(4.71 KB)
📄 outqueue.c(4.48 KB)
📄 outqueue.h(4.88 KB)
📄 stream_buffer_decoder.c(2.72 KB)
📄 stream_buffer_encoder.c(3.96 KB)
📄 stream_decoder.c(12.7 KB)
📄 stream_decoder.h(599 B)
📄 stream_encoder.c(9.63 KB)
📄 stream_encoder_mt.c(29.64 KB)
📄 stream_flags_common.c(1.29 KB)
📄 stream_flags_common.h(883 B)
📄 stream_flags_decoder.c(2.23 KB)
📄 stream_flags_encoder.c(2.01 KB)
📄 vli_decoder.c(2.5 KB)
📄 vli_encoder.c(1.89 KB)
📄 vli_size.c(630 B)

Editing: block_header_decoder.c

///////////////////////////////////////////////////////////////////////////////
//
/// \file       block_header_decoder.c
/// \brief      Decodes Block Header from .xz files
//
//  Author:     Lasse Collin
//
//  This file has been put into the public domain.
//  You can do whatever you want with this file.
//
///////////////////////////////////////////////////////////////////////////////

#include "common.h"
#include "check.h"

static void
free_properties(lzma_block *block, const lzma_allocator *allocator)
{
	// Free allocated filter options. The last array member is not
	// touched after the initialization in the beginning of
	// lzma_block_header_decode(), so we don't need to touch that here.
	for (size_t i = 0; i < LZMA_FILTERS_MAX; ++i) {
		lzma_free(block->filters[i].options, allocator);
		block->filters[i].id = LZMA_VLI_UNKNOWN;
		block->filters[i].options = NULL;
	}

return;
}

extern LZMA_API(lzma_ret)
lzma_block_header_decode(lzma_block *block,
		const lzma_allocator *allocator, const uint8_t *in)
{
	// NOTE: We consider the header to be corrupt not only when the
	// CRC32 doesn't match, but also when variable-length integers
	// are invalid or over 63 bits, or if the header is too small
	// to contain the claimed information.

// Initialize the filter options array. This way the caller can
	// safely free() the options even if an error occurs in this function.
	for (size_t i = 0; i <= LZMA_FILTERS_MAX; ++i) {
		block->filters[i].id = LZMA_VLI_UNKNOWN;
		block->filters[i].options = NULL;
	}

// Versions 0 and 1 are supported. If a newer version was specified,
	// we need to downgrade it.
	if (block->version > 1)
		block->version = 1;

// This isn't a Block Header option, but since the decompressor will
	// read it if version >= 1, it's better to initialize it here than
	// to expect the caller to do it since in almost all cases this
	// should be false.
	block->ignore_check = false;

// Validate Block Header Size and Check type. The caller must have
	// already set these, so it is a programming error if this test fails.
	if (lzma_block_header_size_decode(in[0]) != block->header_size
			|| (unsigned int)(block->check) > LZMA_CHECK_ID_MAX)
		return LZMA_PROG_ERROR;

// Exclude the CRC32 field.
	const size_t in_size = block->header_size - 4;

// Verify CRC32
	if (lzma_crc32(in, in_size, 0) != read32le(in + in_size))
		return LZMA_DATA_ERROR;

// Check for unsupported flags.
	if (in[1] & 0x3C)
		return LZMA_OPTIONS_ERROR;

// Start after the Block Header Size and Block Flags fields.
	size_t in_pos = 2;

// Compressed Size
	if (in[1] & 0x40) {
		return_if_error(lzma_vli_decode(&block->compressed_size,
				NULL, in, &in_pos, in_size));

// Validate Compressed Size. This checks that it isn't zero
		// and that the total size of the Block is a valid VLI.
		if (lzma_block_unpadded_size(block) == 0)
			return LZMA_DATA_ERROR;
	} else {
		block->compressed_size = LZMA_VLI_UNKNOWN;
	}

// Uncompressed Size
	if (in[1] & 0x80)
		return_if_error(lzma_vli_decode(&block->uncompressed_size,
				NULL, in, &in_pos, in_size));
	else
		block->uncompressed_size = LZMA_VLI_UNKNOWN;

// Filter Flags
	const size_t filter_count = (in[1] & 3U) + 1;
	for (size_t i = 0; i < filter_count; ++i) {
		const lzma_ret ret = lzma_filter_flags_decode(
				&block->filters[i], allocator,
				in, &in_pos, in_size);
		if (ret != LZMA_OK) {
			free_properties(block, allocator);
			return ret;
		}
	}

// Padding
	while (in_pos < in_size) {
		if (in[in_pos++] != 0x00) {
			free_properties(block, allocator);

// Possibly some new field present so use
			// LZMA_OPTIONS_ERROR instead of LZMA_DATA_ERROR.
			return LZMA_OPTIONS_ERROR;
		}
	}

return LZMA_OK;
}

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Editing: block_header_decoder.c

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