[coreboot] lzma validity checker

[Carl-Daniel Hailfinger]

Untested. Needs lzmadecode.c from coreboot v3.

Regards,
Carl-Daniel


/* 

Coreboot interface to memory-saving variant of LZMA decoder

(C)opyright 2006 Carl-Daniel Hailfinger
Released under the GNU GPL v2 or later

Parts of this file are based on C/7zip/Compress/LZMA_C/LzmaTest.c from the LZMA
SDK 4.42, which is written and distributed to public domain by Igor Pavlov.

*/

#include "lzmadecode.c"

#define LZMA_SCRATCHPAD_SIZE 15980

int lzma_check(u8 *src)
{
	unsigned char properties[LZMA_PROPERTIES_SIZE];
	UInt32 outSize;
	SizeT inProcessed;
	SizeT outProcessed;
	int res;
	CLzmaDecoderState state;
	SizeT mallocneeds;
	unsigned char scratchpad[LZMA_SCRATCHPAD_SIZE];
	char *dst;

	memcpy(properties, src, LZMA_PROPERTIES_SIZE);
	outSize = *(UInt32 *)(src + LZMA_PROPERTIES_SIZE);
	dst = malloc(outSize);
	if (LzmaDecodeProperties(&state.Properties, properties, LZMA_PROPERTIES_SIZE) != LZMA_RESULT_OK) {
		printf("Incorrect stream properties\n");
		return -1;
	}
	mallocneeds = (LzmaGetNumProbs(&state.Properties) * sizeof(CProb));
	if (mallocneeds > LZMA_SCRATCHPAD_SIZE) {
		printf("Decoder scratchpad too small, have %i, need %i!\n",
				LZMA_SCRATCHPAD_SIZE, mallocneeds);
		return -1;
	}
	state.Probs = (CProb *)scratchpad;
	res = LzmaDecode(&state, src + LZMA_PROPERTIES_SIZE + 8, (SizeT)0xffffffff, &inProcessed,
		dst, outSize, &outProcessed);
	if (res != 0) {
		printf("Decoding error = %d\n", res);
		return -1;
	}
	return 0;
}


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