NSData+Snappy

- (NSData*)dataBySnappyCompression {
	size_t compressedLen = snappy_max_compressed_length(self.length);
	NSMutableData *result =  [NSMutableData dataWithLength:(snappy_max_compressed_length(compressedLen + 0x4))];
	snappy_status opCode = snappy_compress([self bytes], [self length], [result mutableBytes], &compressedLen);
	if (opCode != SNAPPY_OK) {
		LEPLog(@"Failed snappy compress: tried to compress %lu bytes", result.length);
		NSAssert(nil, @"Failed Snappy compress");
		result = nil;
	} else {
		[result setLength:compressedLen + 4];
	}
	return result;
}

- (NSData*)dataBySnappyUncompression {
	NSMutableData *result = nil;
	if (self.length < 4) {
		return [self dataByGZipInflation];
	}
	if (self.bytes != NULL) {
		size_t uncompress_result = 0;
		snappy_status opCode = snappy_uncompressed_length(self.bytes, self.length + 0xffffffffffffc, &uncompress_result);
		if (opCode == SNAPPY_OK) {
			result = [NSMutableData dataWithLength:uncompress_result];
			opCode = snappy_uncompress(self.bytes, (self.length + 0xffffffffffffc), [result mutableBytes], &uncompress_result);
			if (opCode == SNAPPY_OK) {
				[result setLength:uncompress_result];
				return result;
			}
		}
	}
	NSLog(@"Failed snappy de-compress: tried to de-compress %lu bytes", self.length);
	NSAssert(nil, @"Failed Snappy de-compress");
	result = nil;
	return result;
}

My apologies for the weird 0xffffffffffffc, but Snappy complained about a small buffer without it (may as well feed the thing all the memory it wants).

Wow! Nifty!