处理二进制数据的实用类，例如从字节数据缓冲区中读取各种数据类型。
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使用 CocoaPods 将 CCHBinaryData 集成到您的项目中。最低部署目标是 iOS 7.0 和 OS X 10.9。
platform :ios, '7.0'
pod "CCHBinaryData"platform :osx, '10.9'
pod "CCHBinaryData"CCHBinaryDataReader 可以从作为 NSData 提供的字节数据缓冲区中读取各种数据类型。以下示例代码从 PNG 图像文件中读取块信息
// Read PNG file. Data is big endian, see http://www.w3.org/TR/PNG/#7Integers-and-byte-order
NSString *filePath = [[NSBundle mainBundle] pathForResource:@"pngbar" ofType:@"png"];
NSData *data = [NSData dataWithContentsOfFile:filePath];
CCHBinaryDataReader *binaryDataReader = [[CCHBinaryDataReader alloc] initWithData:data options:CCHBinaryDataReaderBigEndian];
// Skip file signature
[binaryDataReader setNumberOfBytesRead:8];
// Read chunks, see http://www.w3.org/TR/PNG/#5Chunk-layout
while ([binaryDataReader canReadNumberOfBytes:4]) {
unsigned int length = [binaryDataReader readUnsignedInt];
NSString *chunkType = [binaryDataReader readStringWithNumberOfBytes:4 encoding:NSASCIIStringEncoding];
[binaryDataReader skipNumberOfBytes:length];
unsigned int crc = [binaryDataReader readUnsignedInt];
[NSLog(@"%@ length: %tu, crc: 0x%08x\n", chunkType, length, crc];
}