FindSOF
for (s = 0; (l - s > (int)fMinFrameSize) && ((i = FindSOF(b + s, l - fMinFrameSize - s, &which)) > -1); s++) {
int FindSOF(const uint8 *buf, size_t buflen, int *which=NULL);
while ((j = FindSOF(buf+i, bufsize-i, &which)) > -1) {