4 * Piotr Fusik, 18.11.2001
9 int uncompress (char* dest, unsigned* destLen,
10 const char* source, unsigned sourceLen)
15 /* source[0]: Compression method and flags
16 bits 0 to 3: Compression method (must be Z_DEFLATED)
17 bits 4 to 7: Compression info (must be <= 7)
19 bits 0 to 4: Check bits
20 bit 5: Preset dictionary (not supported, sorry)
21 bits 6 to 7: Compression level
23 if ((source[0] & 0x8f) != Z_DEFLATED || source[1] & 0x20)
25 if ((((unsigned) source[0] << 8) | (unsigned char) source[1]) % 31)
27 *destLen = len = inflatemem(dest, source + 2);
28 ptr = (unsigned char*) source + sourceLen - 4;
29 csum = adler32(adler32(0L, Z_NULL, 0), dest, len);
30 if ((unsigned char) csum != ptr[3]
31 || (unsigned char) (csum >> 8) != ptr[2]
32 || (unsigned char) (csum >> 16) != ptr[1]
33 || (unsigned char) (csum >> 24) != ptr[0])