cleanup extract_lz_file

[rsbs2] / rsb-crc.c

diff --git a/rsb-crc.c b/rsb-crc.c
index 3fe5cbc2ed4ca53473eaee16e3e5698bee110c6b..8c8fbbeddbb7eeee8d296dca92d64fa210681fb7 100644 (file)
--- 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;
 }