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Annotation of uae/src/crc32.c, revision 1.1.1.1

1.1       root        1: 
                      2: #include "sysconfig.h"
                      3: #include "sysdeps.h"
                      4: 
                      5: static unsigned long crc_table[256];
                      6: static void make_crc_table()
                      7: {
                      8:     unsigned long c;
                      9:     int n, k;
                     10:     for (n = 0; n < 256; n++)
                     11:     {
                     12:        c = (unsigned long)n;
                     13:        for (k = 0; k < 8; k++) c = (c >> 1) ^ (c & 1 ? 0xedb88320 : 0);
                     14:            crc_table[n] = c;
                     15:     }
                     16: }
                     17: uae_u32 get_crc32 (uae_u8 *buf, int len)
                     18: {
                     19:     uae_u32 crc;
                     20:     if (!crc_table[1])
                     21:        make_crc_table();
                     22:     crc = 0xffffffff;
                     23:     while (len-- > 0) {
                     24:        crc = crc_table[(crc ^ (*buf++)) & 0xff] ^ (crc >> 8);
                     25:     }
                     26:     return crc ^ 0xffffffff;
                     27: }

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