[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;
}