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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: alone_decoder.c

///////////////////////////////////////////////////////////////////////////////
//
/// \file       alone_decoder.c
/// \brief      Decoder for LZMA_Alone files
//
//  Author:     Lasse Collin
//
//  This file has been put into the public domain.
//  You can do whatever you want with this file.
//
///////////////////////////////////////////////////////////////////////////////

#include "alone_decoder.h"
#include "lzma_decoder.h"
#include "lz_decoder.h"

typedef struct {
	lzma_next_coder next;

enum {
		SEQ_PROPERTIES,
		SEQ_DICTIONARY_SIZE,
		SEQ_UNCOMPRESSED_SIZE,
		SEQ_CODER_INIT,
		SEQ_CODE,
	} sequence;

/// If true, reject files that are unlikely to be .lzma files.
	/// If false, more non-.lzma files get accepted and will give
	/// LZMA_DATA_ERROR either immediately or after a few output bytes.
	bool picky;

/// Position in the header fields
	size_t pos;

/// Uncompressed size decoded from the header
	lzma_vli uncompressed_size;

/// Memory usage limit
	uint64_t memlimit;

/// Amount of memory actually needed (only an estimate)
	uint64_t memusage;

/// Options decoded from the header needed to initialize
	/// the LZMA decoder
	lzma_options_lzma options;
} lzma_alone_coder;

static lzma_ret
alone_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_alone_coder *coder = coder_ptr;

while (*out_pos < out_size
			&& (coder->sequence == SEQ_CODE || *in_pos < in_size))
	switch (coder->sequence) {
	case SEQ_PROPERTIES:
		if (lzma_lzma_lclppb_decode(&coder->options, in[*in_pos]))
			return LZMA_FORMAT_ERROR;

coder->sequence = SEQ_DICTIONARY_SIZE;
		++*in_pos;
		break;

case SEQ_DICTIONARY_SIZE:
		coder->options.dict_size
				|= (size_t)(in[*in_pos]) << (coder->pos * 8);

if (++coder->pos == 4) {
			if (coder->picky && coder->options.dict_size
					!= UINT32_MAX) {
				// A hack to ditch tons of false positives:
				// We allow only dictionary sizes that are
				// 2^n or 2^n + 2^(n-1). LZMA_Alone created
				// only files with 2^n, but accepts any
				// dictionary size.
				uint32_t d = coder->options.dict_size - 1;
				d |= d >> 2;
				d |= d >> 3;
				d |= d >> 4;
				d |= d >> 8;
				d |= d >> 16;
				++d;

if (d != coder->options.dict_size)
					return LZMA_FORMAT_ERROR;
			}

coder->pos = 0;
			coder->sequence = SEQ_UNCOMPRESSED_SIZE;
		}

++*in_pos;
		break;

case SEQ_UNCOMPRESSED_SIZE:
		coder->uncompressed_size
				|= (lzma_vli)(in[*in_pos]) << (coder->pos * 8);
		++*in_pos;
		if (++coder->pos < 8)
			break;

// Another hack to ditch false positives: Assume that
		// if the uncompressed size is known, it must be less
		// than 256 GiB.
		if (coder->picky
				&& coder->uncompressed_size != LZMA_VLI_UNKNOWN
				&& coder->uncompressed_size
					>= (LZMA_VLI_C(1) << 38))
			return LZMA_FORMAT_ERROR;

// Calculate the memory usage so that it is ready
		// for SEQ_CODER_INIT.
		coder->memusage = lzma_lzma_decoder_memusage(&coder->options)
				+ LZMA_MEMUSAGE_BASE;

coder->pos = 0;
		coder->sequence = SEQ_CODER_INIT;

// Fall through

case SEQ_CODER_INIT: {
		if (coder->memusage > coder->memlimit)
			return LZMA_MEMLIMIT_ERROR;

lzma_filter_info filters[2] = {
			{
				.init = &lzma_lzma_decoder_init,
				.options = &coder->options,
			}, {
				.init = NULL,
			}
		};

const lzma_ret ret = lzma_next_filter_init(&coder->next,
				allocator, filters);
		if (ret != LZMA_OK)
			return ret;

// Use a hack to set the uncompressed size.
		lzma_lz_decoder_uncompressed(coder->next.coder,
				coder->uncompressed_size);

coder->sequence = SEQ_CODE;
		break;
	}

case SEQ_CODE: {
		return coder->next.code(coder->next.coder,
				allocator, in, in_pos, in_size,
				out, out_pos, out_size, action);
	}

default:
		return LZMA_PROG_ERROR;
	}

return LZMA_OK;
}

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

static lzma_ret
alone_decoder_memconfig(void *coder_ptr, uint64_t *memusage,
		uint64_t *old_memlimit, uint64_t new_memlimit)
{
	lzma_alone_coder *coder = coder_ptr;

*memusage = coder->memusage;
	*old_memlimit = coder->memlimit;

if (new_memlimit != 0) {
		if (new_memlimit < coder->memusage)
			return LZMA_MEMLIMIT_ERROR;

coder->memlimit = new_memlimit;
	}

return LZMA_OK;
}

extern lzma_ret
lzma_alone_decoder_init(lzma_next_coder *next, const lzma_allocator *allocator,
		uint64_t memlimit, bool picky)
{
	lzma_next_coder_init(&lzma_alone_decoder_init, next, allocator);

lzma_alone_coder *coder = next->coder;

if (coder == NULL) {
		coder = lzma_alloc(sizeof(lzma_alone_coder), allocator);
		if (coder == NULL)
			return LZMA_MEM_ERROR;

next->coder = coder;
		next->code = &alone_decode;
		next->end = &alone_decoder_end;
		next->memconfig = &alone_decoder_memconfig;
		coder->next = LZMA_NEXT_CODER_INIT;
	}

coder->sequence = SEQ_PROPERTIES;
	coder->picky = picky;
	coder->pos = 0;
	coder->options.dict_size = 0;
	coder->options.preset_dict = NULL;
	coder->options.preset_dict_size = 0;
	coder->uncompressed_size = 0;
	coder->memlimit = my_max(1, memlimit);
	coder->memusage = LZMA_MEMUSAGE_BASE;

return LZMA_OK;
}

extern LZMA_API(lzma_ret)
lzma_alone_decoder(lzma_stream *strm, uint64_t memlimit)
{
	lzma_next_strm_init(lzma_alone_decoder_init, strm, memlimit, false);

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

return LZMA_OK;
}

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Editing: alone_decoder.c

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