工程目前以objective-c为主，采用的是swift与objective-c混编方式，因此对NSData作了扩展。
gzip压缩
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| /// gzip数据压缩
///
/// - Returns: Data
public func gzipCompress() -> NSData? {
guard self.length > 0 else {
return self
}
var stream = z_stream()
stream.avail_in = uInt(self.length)
stream.total_out = 0
(self as Data).withUnsafeBytes { (bytes:UnsafePointer<Bytef>) in
stream.next_in = UnsafeMutablePointer<Bytef>(mutating:bytes)
}
var status = deflateInit2_(&stream,Z_DEFAULT_COMPRESSION, Z_DEFLATED, MAX_WBITS + 16, MAX_MEM_LEVEL, Z_DEFAULT_STRATEGY, ZLIB_VERSION, GZIP_STREAM_SIZE)
if status != Z_OK {
return nil
}
let compressedData = NSMutableData()
while stream.avail_out == 0 {
stream.avail_out = uInt(GZIP_BUF_LENGTH)
stream.next_out = GZipBuf
status = deflate(&stream, Z_FINISH)
if status != Z_OK && status != Z_STREAM_END {
return nil
}else {
let dataLength = GZIP_BUF_LENGTH - Int(stream.avail_out)
if dataLength > 0 {
compressedData.append(GZipBuf, length: dataLength)
}
}
}
guard deflateEnd(&stream) == Z_OK else {
return nil
}
return compressedData
}
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gzip压缩
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| /// gzip数据解压
///
/// - Returns: NSData
public func gzipUncompress() -> NSData? {
guard self.length > 0 else {
return nil
}
guard self.isGZipCompressed else {
return self
}
var stream = z_stream()
(self as Data).withUnsafeBytes { (bytes:UnsafePointer<Bytef>) in
stream.next_in = UnsafeMutablePointer<Bytef>(mutating:bytes)
}
stream.avail_in = uInt(self.length)
stream.total_out = 0
var status: Int32 = inflateInit2_(&stream, MAX_WBITS + 16, ZLIB_VERSION,GZIP_STREAM_SIZE)
guard status == Z_OK else {
return nil
}
let decompressed = NSMutableData(capacity: self.length * 2)
while stream.avail_out == 0 {
stream.avail_out = uInt(GZIP_BUF_LENGTH)
stream.next_out = GZipBuf
status = inflate(&stream, Z_SYNC_FLUSH)
if status != Z_OK && status != Z_STREAM_END {
break
}else {
let dataLen :Int = GZIP_BUF_LENGTH - Int(stream.avail_out);
if dataLen > 0 {
decompressed?.append(GZipBuf, length: dataLen)
}
}
}
if inflateEnd(&stream) != Z_OK {
return nil
}
return decompressed!
}
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