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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_encoder.c

///////////////////////////////////////////////////////////////////////////////
//
/// \file       block_header_encoder.c
/// \brief      Encodes Block Header for .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"

extern LZMA_API(lzma_ret)
lzma_block_header_size(lzma_block *block)
{
	if (block->version > 1)
		return LZMA_OPTIONS_ERROR;

// Block Header Size + Block Flags + CRC32.
	uint32_t size = 1 + 1 + 4;

// Compressed Size
	if (block->compressed_size != LZMA_VLI_UNKNOWN) {
		const uint32_t add = lzma_vli_size(block->compressed_size);
		if (add == 0 || block->compressed_size == 0)
			return LZMA_PROG_ERROR;

size += add;
	}

// Uncompressed Size
	if (block->uncompressed_size != LZMA_VLI_UNKNOWN) {
		const uint32_t add = lzma_vli_size(block->uncompressed_size);
		if (add == 0)
			return LZMA_PROG_ERROR;

size += add;
	}

// List of Filter Flags
	if (block->filters == NULL || block->filters[0].id == LZMA_VLI_UNKNOWN)
		return LZMA_PROG_ERROR;

for (size_t i = 0; block->filters[i].id != LZMA_VLI_UNKNOWN; ++i) {
		// Don't allow too many filters.
		if (i == LZMA_FILTERS_MAX)
			return LZMA_PROG_ERROR;

uint32_t add;
		return_if_error(lzma_filter_flags_size(&add,
				block->filters + i));

size += add;
	}

// Pad to a multiple of four bytes.
	block->header_size = (size + 3) & ~UINT32_C(3);

// NOTE: We don't verify that the encoded size of the Block stays
	// within limits. This is because it is possible that we are called
	// with exaggerated Compressed Size (e.g. LZMA_VLI_MAX) to reserve
	// space for Block Header, and later called again with lower,
	// real values.

return LZMA_OK;
}

extern LZMA_API(lzma_ret)
lzma_block_header_encode(const lzma_block *block, uint8_t *out)
{
	// Validate everything but filters.
	if (lzma_block_unpadded_size(block) == 0
			|| !lzma_vli_is_valid(block->uncompressed_size))
		return LZMA_PROG_ERROR;

// Indicate the size of the buffer _excluding_ the CRC32 field.
	const size_t out_size = block->header_size - 4;

// Store the Block Header Size.
	out[0] = out_size / 4;

// We write Block Flags in pieces.
	out[1] = 0x00;
	size_t out_pos = 2;

// Compressed Size
	if (block->compressed_size != LZMA_VLI_UNKNOWN) {
		return_if_error(lzma_vli_encode(block->compressed_size, NULL,
				out, &out_pos, out_size));

out[1] |= 0x40;
	}

// Uncompressed Size
	if (block->uncompressed_size != LZMA_VLI_UNKNOWN) {
		return_if_error(lzma_vli_encode(block->uncompressed_size, NULL,
				out, &out_pos, out_size));

out[1] |= 0x80;
	}

// Filter Flags
	if (block->filters == NULL || block->filters[0].id == LZMA_VLI_UNKNOWN)
		return LZMA_PROG_ERROR;

size_t filter_count = 0;
	do {
		// There can be a maximum of four filters.
		if (filter_count == LZMA_FILTERS_MAX)
			return LZMA_PROG_ERROR;

return_if_error(lzma_filter_flags_encode(
				block->filters + filter_count,
				out, &out_pos, out_size));

} while (block->filters[++filter_count].id != LZMA_VLI_UNKNOWN);

out[1] |= filter_count - 1;

// Padding
	memzero(out + out_pos, out_size - out_pos);

// CRC32
	write32le(out + out_size, lzma_crc32(out, out_size, 0));

return LZMA_OK;
}

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Editing: block_header_encoder.c

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