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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_decoder.c

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

#include "block_decoder.h"
#include "filter_decoder.h"
#include "check.h"

typedef struct {
	enum {
		SEQ_CODE,
		SEQ_PADDING,
		SEQ_CHECK,
	} sequence;

/// The filters in the chain; initialized with lzma_raw_decoder_init().
	lzma_next_coder next;

/// Decoding options; we also write Compressed Size and Uncompressed
	/// Size back to this structure when the decoding has been finished.
	lzma_block *block;

/// Compressed Size calculated while decoding
	lzma_vli compressed_size;

/// Uncompressed Size calculated while decoding
	lzma_vli uncompressed_size;

/// Maximum allowed Compressed Size; this takes into account the
	/// size of the Block Header and Check fields when Compressed Size
	/// is unknown.
	lzma_vli compressed_limit;

/// Position when reading the Check field
	size_t check_pos;

/// Check of the uncompressed data
	lzma_check_state check;

/// True if the integrity check won't be calculated and verified.
	bool ignore_check;
} lzma_block_coder;

static inline bool
update_size(lzma_vli *size, lzma_vli add, lzma_vli limit)
{
	if (limit > LZMA_VLI_MAX)
		limit = LZMA_VLI_MAX;

if (limit < *size || limit - *size < add)
		return true;

*size += add;

return false;
}

static inline bool
is_size_valid(lzma_vli size, lzma_vli reference)
{
	return reference == LZMA_VLI_UNKNOWN || reference == size;
}

static lzma_ret
block_decode(void *coder_ptr, const 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)
{
	lzma_block_coder *coder = coder_ptr;

switch (coder->sequence) {
	case SEQ_CODE: {
		const size_t in_start = *in_pos;
		const size_t out_start = *out_pos;

const lzma_ret ret = coder->next.code(coder->next.coder,
				allocator, in, in_pos, in_size,
				out, out_pos, out_size, action);

const size_t in_used = *in_pos - in_start;
		const size_t out_used = *out_pos - out_start;

// NOTE: We compare to compressed_limit here, which prevents
		// the total size of the Block growing past LZMA_VLI_MAX.
		if (update_size(&coder->compressed_size, in_used,
					coder->compressed_limit)
				|| update_size(&coder->uncompressed_size,
					out_used,
					coder->block->uncompressed_size))
			return LZMA_DATA_ERROR;

if (!coder->ignore_check)
			lzma_check_update(&coder->check, coder->block->check,
					out + out_start, out_used);

if (ret != LZMA_STREAM_END)
			return ret;

// Compressed and Uncompressed Sizes are now at their final
		// values. Verify that they match the values given to us.
		if (!is_size_valid(coder->compressed_size,
					coder->block->compressed_size)
				|| !is_size_valid(coder->uncompressed_size,
					coder->block->uncompressed_size))
			return LZMA_DATA_ERROR;

// Copy the values into coder->block. The caller
		// may use this information to construct Index.
		coder->block->compressed_size = coder->compressed_size;
		coder->block->uncompressed_size = coder->uncompressed_size;

coder->sequence = SEQ_PADDING;
	}

// Fall through

case SEQ_PADDING:
		// Compressed Data is padded to a multiple of four bytes.
		while (coder->compressed_size & 3) {
			if (*in_pos >= in_size)
				return LZMA_OK;

// We use compressed_size here just get the Padding
			// right. The actual Compressed Size was stored to
			// coder->block already, and won't be modified by
			// us anymore.
			++coder->compressed_size;

if (in[(*in_pos)++] != 0x00)
				return LZMA_DATA_ERROR;
		}

if (coder->block->check == LZMA_CHECK_NONE)
			return LZMA_STREAM_END;

if (!coder->ignore_check)
			lzma_check_finish(&coder->check, coder->block->check);

coder->sequence = SEQ_CHECK;

// Fall through

case SEQ_CHECK: {
		const size_t check_size = lzma_check_size(coder->block->check);
		lzma_bufcpy(in, in_pos, in_size, coder->block->raw_check,
				&coder->check_pos, check_size);
		if (coder->check_pos < check_size)
			return LZMA_OK;

// Validate the Check only if we support it.
		// coder->check.buffer may be uninitialized
		// when the Check ID is not supported.
		if (!coder->ignore_check
				&& lzma_check_is_supported(coder->block->check)
				&& memcmp(coder->block->raw_check,
					coder->check.buffer.u8,
					check_size) != 0)
			return LZMA_DATA_ERROR;

return LZMA_STREAM_END;
	}
	}

return LZMA_PROG_ERROR;
}

static void
block_decoder_end(void *coder_ptr, const lzma_allocator *allocator)
{
	lzma_block_coder *coder = coder_ptr;
	lzma_next_end(&coder->next, allocator);
	lzma_free(coder, allocator);
	return;
}

extern lzma_ret
lzma_block_decoder_init(lzma_next_coder *next, const lzma_allocator *allocator,
		lzma_block *block)
{
	lzma_next_coder_init(&lzma_block_decoder_init, next, allocator);

// Validate the options. lzma_block_unpadded_size() does that for us
	// except for Uncompressed Size and filters. Filters are validated
	// by the raw decoder.
	if (lzma_block_unpadded_size(block) == 0
			|| !lzma_vli_is_valid(block->uncompressed_size))
		return LZMA_PROG_ERROR;

// Allocate *next->coder if needed.
	lzma_block_coder *coder = next->coder;
	if (coder == NULL) {
		coder = lzma_alloc(sizeof(lzma_block_coder), allocator);
		if (coder == NULL)
			return LZMA_MEM_ERROR;

next->coder = coder;
		next->code = &block_decode;
		next->end = &block_decoder_end;
		coder->next = LZMA_NEXT_CODER_INIT;
	}

// Basic initializations
	coder->sequence = SEQ_CODE;
	coder->block = block;
	coder->compressed_size = 0;
	coder->uncompressed_size = 0;

// If Compressed Size is not known, we calculate the maximum allowed
	// value so that encoded size of the Block (including Block Padding)
	// is still a valid VLI and a multiple of four.
	coder->compressed_limit
			= block->compressed_size == LZMA_VLI_UNKNOWN
				? (LZMA_VLI_MAX & ~LZMA_VLI_C(3))
					- block->header_size
					- lzma_check_size(block->check)
				: block->compressed_size;

// Initialize the check. It's caller's problem if the Check ID is not
	// supported, and the Block decoder cannot verify the Check field.
	// Caller can test lzma_check_is_supported(block->check).
	coder->check_pos = 0;
	lzma_check_init(&coder->check, block->check);

coder->ignore_check = block->version >= 1
			? block->ignore_check : false;

// Initialize the filter chain.
	return lzma_raw_decoder_init(&coder->next, allocator,
			block->filters);
}

extern LZMA_API(lzma_ret)
lzma_block_decoder(lzma_stream *strm, lzma_block *block)
{
	lzma_next_strm_init(lzma_block_decoder_init, strm, block);

strm->internal->supported_actions[LZMA_RUN] = true;
	strm->internal->supported_actions[LZMA_FINISH] = true;

return LZMA_OK;
}

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Editing: block_decoder.c

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