X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/rsbs2/blobdiff_plain/6fc57dcd5431aa5e19febfadb242de1e80f16c8f..2363a0d6a8cf44f7288e0795ff29e081ecf3a08f:/rsb-crc.c

diff --git a/rsb-crc.c b/rsb-crc.c
index 3fe5cbc..8c8fbbe 100644
--- a/rsb-crc.c
+++ b/rsb-crc.c
@@ -115,79 +115,24 @@ unsigned int rsb_crc(unsigned int r11_crc, unsigned char *r10_buf, unsigned int
  * 55ae0: DATA:   0x04c11db7
  */
 
-unsigned int rsb_crc2(unsigned char *r0_buf, unsigned int r1_buflen, unsigned int r2_magic, unsigned int *crc) {
-	int r8_ret = 1;
-	unsigned int r3 = 0xc0000000;
+unsigned int rsb_crc2(unsigned char *r0_buf, unsigned int r1_buflen, unsigned int r2_magic, unsigned int *crc_out) {
 	unsigned int r4_len;
-	unsigned int r5;
-	unsigned int r6;
-	unsigned int r7_poly;
-	unsigned int r9;
-	unsigned int carry;
+	unsigned int file_crc;
 
-#if 0
-	if (r0_buf <= r3)
-		return r8_ret;
-#endif
+	r4_len = *(unsigned int*)(r0_buf + 0x20);
 
-	r3 = ((unsigned int)r0_buf) + 0x20;
-	r4_len = *((unsigned int*)r3);
-	printf("CRC: length: %d\n", r4_len);
-
-	r8_ret = 2;
-
-	r3 += 4;
-	r5 = *((unsigned int*)r3);
-
-	if (r5 != r2_magic)
-		return r8_ret;
-	
-	r8_ret = 3;
-
-	if (r1_buflen >= r4_len) {
-		r5 = 0;
-	} else {
-		r5 = 1;
-	}
-
-	if (r5 != 0)
-		return r8_ret;
+	if (*((unsigned int*)(r0_buf + 0x24)) != r2_magic)
+		return 2; /* MAGIC does not match */
 	
-	r8_ret = 4;
-
-	r3 = (unsigned int)r0_buf;
-	r4_len += r3;
+	if (r1_buflen < r4_len)
+		return 3; /* image to small */
 	
-	r5 = ~0x0;
-
-	r7_poly = POLY;
-
-	while (r3 < r4_len) {
-		r9 = r3 & (~0x3);
-		r6 = *((unsigned int*)r9);
-		r9 = r3 & 0x3;
-		r9 = r9 << 0x3;
-		r6 = r6 >> r9;
-		r5 = r5 ^ (r6 << 24);
-		r6 = 0x8;
-
-		do {
-			carry = r5 & 0x80000000;
-			r5 = r5 << 1;
-			if (carry)
-				r5 = r5 ^ r7_poly;
-			r6--;
-		} while(r6);
-		r3++;
-	}
-
-	r5 = ~r5;
-	*crc = r5;
+	*crc_out = ~rsb_crc(~0x0, r0_buf, r4_len);
 
-	r3 = *((unsigned int*)r4_len);
+	file_crc = *((unsigned int*)(r0_buf + r4_len));
 
-	if (r3 == r5)
-		r8_ret = 0;
+	if (file_crc != *crc_out)
+		return 4;
 
-	return r8_ret;
+	return 0;
 }