File Manager

003 File Manager

Current Path: /usr/src/contrib/xz/src/liblzma/common

usr / src / contrib / xz / src / liblzma / common /

📁 ..
📄 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_encoder.c

///////////////////////////////////////////////////////////////////////////////
//
/// \file       block_encoder.c
/// \brief      Encodes .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_encoder.h"
#include "filter_encoder.h"
#include "check.h"

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

/// Encoding options; we also write Unpadded Size, Compressed Size,
	/// and Uncompressed Size back to this structure when the encoding
	/// has been finished.
	lzma_block *block;

enum {
		SEQ_CODE,
		SEQ_PADDING,
		SEQ_CHECK,
	} sequence;

/// Compressed Size calculated while encoding
	lzma_vli compressed_size;

/// Uncompressed Size calculated while encoding
	lzma_vli uncompressed_size;

/// Position in the Check field
	size_t pos;

/// Check of the uncompressed data
	lzma_check_state check;
} lzma_block_coder;

static lzma_ret
block_encode(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;

// Check that our amount of input stays in proper limits.
	if (LZMA_VLI_MAX - coder->uncompressed_size < in_size - *in_pos)
		return LZMA_DATA_ERROR;

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;

if (COMPRESSED_SIZE_MAX - coder->compressed_size < out_used)
			return LZMA_DATA_ERROR;

coder->compressed_size += out_used;

// No need to check for overflow because we have already
		// checked it at the beginning of this function.
		coder->uncompressed_size += in_used;

lzma_check_update(&coder->check, coder->block->check,
				in + in_start, in_used);

if (ret != LZMA_STREAM_END || action == LZMA_SYNC_FLUSH)
			return ret;

assert(*in_pos == in_size);
		assert(action == LZMA_FINISH);

// 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:
		// Pad Compressed Data to a multiple of four bytes. We can
		// use coder->compressed_size for this since we don't need
		// it for anything else anymore.
		while (coder->compressed_size & 3) {
			if (*out_pos >= out_size)
				return LZMA_OK;

out[*out_pos] = 0x00;
			++*out_pos;
			++coder->compressed_size;
		}

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

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(coder->check.buffer.u8, &coder->pos, check_size,
				out, out_pos, out_size);
		if (coder->pos < check_size)
			return LZMA_OK;

memcpy(coder->block->raw_check, coder->check.buffer.u8,
				check_size);
		return LZMA_STREAM_END;
	}
	}

return LZMA_PROG_ERROR;
}

static void
block_encoder_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;
}

static lzma_ret
block_encoder_update(void *coder_ptr, const lzma_allocator *allocator,
		const lzma_filter *filters lzma_attribute((__unused__)),
		const lzma_filter *reversed_filters)
{
	lzma_block_coder *coder = coder_ptr;

if (coder->sequence != SEQ_CODE)
		return LZMA_PROG_ERROR;

return lzma_next_filter_update(
			&coder->next, allocator, reversed_filters);
}

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

if (block == NULL)
		return LZMA_PROG_ERROR;

// The contents of the structure may depend on the version so
	// check the version first.
	if (block->version > 1)
		return LZMA_OPTIONS_ERROR;

// If the Check ID is not supported, we cannot calculate the check and
	// thus not create a proper Block.
	if ((unsigned int)(block->check) > LZMA_CHECK_ID_MAX)
		return LZMA_PROG_ERROR;

if (!lzma_check_is_supported(block->check))
		return LZMA_UNSUPPORTED_CHECK;

// Allocate and initialize *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_encode;
		next->end = &block_encoder_end;
		next->update = &block_encoder_update;
		coder->next = LZMA_NEXT_CODER_INIT;
	}

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

// Initialize the check
	lzma_check_init(&coder->check, block->check);

// Initialize the requested filters.
	return lzma_raw_encoder_init(&coder->next, allocator, block->filters);
}

extern LZMA_API(lzma_ret)
lzma_block_encoder(lzma_stream *strm, lzma_block *block)
{
	lzma_next_strm_init(lzma_block_encoder_init, strm, block);

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

return LZMA_OK;
}

003 File Manager

Editing: block_encoder.c

Upload File

Create Folder