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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: auto_decoder.c

///////////////////////////////////////////////////////////////////////////////
//
/// \file       auto_decoder.c
/// \brief      Autodetect between .xz Stream and .lzma (LZMA_Alone) formats
//
//  Author:     Lasse Collin
//
//  This file has been put into the public domain.
//  You can do whatever you want with this file.
//
///////////////////////////////////////////////////////////////////////////////

#include "stream_decoder.h"
#include "alone_decoder.h"

typedef struct {
	/// Stream decoder or LZMA_Alone decoder
	lzma_next_coder next;

uint64_t memlimit;
	uint32_t flags;

enum {
		SEQ_INIT,
		SEQ_CODE,
		SEQ_FINISH,
	} sequence;
} lzma_auto_coder;

static lzma_ret
auto_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_auto_coder *coder = coder_ptr;

switch (coder->sequence) {
	case SEQ_INIT:
		if (*in_pos >= in_size)
			return LZMA_OK;

// Update the sequence now, because we want to continue from
		// SEQ_CODE even if we return some LZMA_*_CHECK.
		coder->sequence = SEQ_CODE;

// Detect the file format. For now this is simple, since if
		// it doesn't start with 0xFD (the first magic byte of the
		// new format), it has to be LZMA_Alone, or something that
		// we don't support at all.
		if (in[*in_pos] == 0xFD) {
			return_if_error(lzma_stream_decoder_init(
					&coder->next, allocator,
					coder->memlimit, coder->flags));
		} else {
			return_if_error(lzma_alone_decoder_init(&coder->next,
					allocator, coder->memlimit, true));

// If the application wants to know about missing
			// integrity check or about the check in general, we
			// need to handle it here, because LZMA_Alone decoder
			// doesn't accept any flags.
			if (coder->flags & LZMA_TELL_NO_CHECK)
				return LZMA_NO_CHECK;

if (coder->flags & LZMA_TELL_ANY_CHECK)
				return LZMA_GET_CHECK;
		}

// Fall through

case SEQ_CODE: {
		const lzma_ret ret = coder->next.code(
				coder->next.coder, allocator,
				in, in_pos, in_size,
				out, out_pos, out_size, action);
		if (ret != LZMA_STREAM_END
				|| (coder->flags & LZMA_CONCATENATED) == 0)
			return ret;

coder->sequence = SEQ_FINISH;
	}

// Fall through

case SEQ_FINISH:
		// When LZMA_DECODE_CONCATENATED was used and we were decoding
		// LZMA_Alone file, we need to check check that there is no
		// trailing garbage and wait for LZMA_FINISH.
		if (*in_pos < in_size)
			return LZMA_DATA_ERROR;

return action == LZMA_FINISH ? LZMA_STREAM_END : LZMA_OK;

default:
		assert(0);
		return LZMA_PROG_ERROR;
	}
}

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

static lzma_check
auto_decoder_get_check(const void *coder_ptr)
{
	const lzma_auto_coder *coder = coder_ptr;

// It is LZMA_Alone if get_check is NULL.
	return coder->next.get_check == NULL ? LZMA_CHECK_NONE
			: coder->next.get_check(coder->next.coder);
}

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

lzma_ret ret;

if (coder->next.memconfig != NULL) {
		ret = coder->next.memconfig(coder->next.coder,
				memusage, old_memlimit, new_memlimit);
		assert(*old_memlimit == coder->memlimit);
	} else {
		// No coder is configured yet. Use the base value as
		// the current memory usage.
		*memusage = LZMA_MEMUSAGE_BASE;
		*old_memlimit = coder->memlimit;

ret = LZMA_OK;
		if (new_memlimit != 0 && new_memlimit < *memusage)
			ret = LZMA_MEMLIMIT_ERROR;
	}

if (ret == LZMA_OK && new_memlimit != 0)
		coder->memlimit = new_memlimit;

return ret;
}

static lzma_ret
auto_decoder_init(lzma_next_coder *next, const lzma_allocator *allocator,
		uint64_t memlimit, uint32_t flags)
{
	lzma_next_coder_init(&auto_decoder_init, next, allocator);

if (flags & ~LZMA_SUPPORTED_FLAGS)
		return LZMA_OPTIONS_ERROR;

lzma_auto_coder *coder = next->coder;
	if (coder == NULL) {
		coder = lzma_alloc(sizeof(lzma_auto_coder), allocator);
		if (coder == NULL)
			return LZMA_MEM_ERROR;

next->coder = coder;
		next->code = &auto_decode;
		next->end = &auto_decoder_end;
		next->get_check = &auto_decoder_get_check;
		next->memconfig = &auto_decoder_memconfig;
		coder->next = LZMA_NEXT_CODER_INIT;
	}

coder->memlimit = my_max(1, memlimit);
	coder->flags = flags;
	coder->sequence = SEQ_INIT;

return LZMA_OK;
}

extern LZMA_API(lzma_ret)
lzma_auto_decoder(lzma_stream *strm, uint64_t memlimit, uint32_t flags)
{
	lzma_next_strm_init(auto_decoder_init, strm, memlimit, flags);

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

return LZMA_OK;
}

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Editing: auto_decoder.c

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