// helper method for partial checksums. From the zlib.h header:
//
// Combine two Adler-32 checksums into one. For two sequences of bytes, seq1
// and seq2 with lengths len1 and len2, Adler-32 checksums were calculated for
// each, adler1 and adler2. adler32_combine() returns the Adler-32 checksum of
// seq1 and seq2 concatenated, requiring only adler1, adler2, and len2.
func Adler32Combine(adler1, adler2 uint32, len2 int) uint32 {
return uint32(C.adler32_combine(C.uLong(adler1), C.uLong(adler2), C.z_off_t(len2)))
}
// helper method for partial checksums. From the zlib.h header:
//
// Combine two CRC-32 checksums into one. For two sequences of bytes, seq1
// and seq2 with lengths len1 and len2, CRC-32 checksums were calculated for
// each, crc1 and crc2. crc32_combine() returns the CRC-32 checksum of
// seq1 and seq2 concatenated, requiring only crc1, crc2, and len2.
func Crc32Combine(crc1, crc2 uint32, len2 int) uint32 {
return uint32(C.crc32_combine(C.uLong(crc1), C.uLong(crc2), C.z_off_t(len2)))
}