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Use binary search and temporary buffer for Intel bruteforcing

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RichardG867
2022-04-19 16:01:38 -03:00
parent 69005babc0
commit 0276ebf7a7
1 changed files with 26 additions and 13 deletions
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39
bios_extract/src/bios_extract.c
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@@ -283,6 +283,7 @@ int main(int argc, char *argv[])
}
/* Bruteforce Intel AMI Color fork LH5. */
unsigned char *tempbuf = NULL;
Offset2 = 1;
for (Offset1 = 0; Offset1 < (FileLength - 10); Offset1 += 0x1000) {
BIOSOffset = Offset1;
@@ -304,24 +305,36 @@ retry: if (((fd = LH5Decode(BIOSImage + BIOSOffset, FileLength - BIOSOffset, Int
Offset2 = 0; /* main body found, all good */
}
save: Buffer = MMapOutputFile((char *) IntelAMI, len);
if (!Buffer)
return 1;
save: tempbuf = realloc(tempbuf, len);
memset(tempbuf, 0, len);
i = len;
while (((fd = LH5Decode(BIOSImage + BIOSOffset, FileLength - BIOSOffset, Buffer, i)) == -1) &&
(i > 16))
i--;
if (fd > 0) {
printf("0x%05X (%6d bytes) -> %s\t(%d bytes)\n",
BIOSOffset, fd, IntelAMI, len);
SetRemainder(BIOSOffset, fd, FALSE);
int j = len / 2;
while (1) {
fd = LH5Decode(BIOSImage + BIOSOffset, FileLength - BIOSOffset, tempbuf, i);
if (fd == -1)
i -= j;
else if ((i == len) || (j == 1))
break;
else
i += j;
j /= 2;
if (j < 1)
j = 1;
}
munmap(Buffer, len);
if ((fd > 0) && (i > 0)) {
printf("0x%05X (%6d bytes) -> %s\t(%d bytes)\n",
BIOSOffset, fd, IntelAMI, i);
SetRemainder(BIOSOffset, fd, FALSE);
/* There may be compressed data after the main body. (Advanced/EV VBIOS) */
if (fd > 0) {
Buffer = MMapOutputFile((char *) IntelAMI, i);
if (!Buffer)
return 1;
memcpy(Buffer, tempbuf, i);
munmap(Buffer, i);
/* There may be compressed data after the main body. (Advanced/EV VBIOS) */
if (fd & 1) /* padded to even byte */
fd++;
BIOSOffset += fd;