NSData中拼接数据读取（按照写入顺序读取）
- (int8_t)eeo_readInt8:(**int** *)offset {
int8_t result;
[**self** getBytes:&result range:NSMakeRange(*offset, **sizeof**(result))];
*offset += **sizeof**(result);
**return** result;
}
- (uint8_t)eeo_readUint8:(**int** *)offset {
uint8_t result;
[**self** getBytes:&result range:NSMakeRange(*offset, **sizeof**(result))];
*offset += **sizeof**(result);
**return** result;
}
\
- (uint16_t)eeo_readUint16:(**int** *)offset {
uint16_t result;
[**self** getBytes:&result range:NSMakeRange(*offset, **sizeof**(result))];
*offset += **sizeof**(result);
**return** result;
}
- (uint16_t)eeo_readUint16ByBig:(**int** *)offset {
uint16_t result = [**self** eeo_readUint16:offset];
result = CFSwapInt16HostToBig(result);
**return** result;
}
\
- (**int**)eeo_readInt:(**int** *)offset {
**int** result;
[**self** getBytes:&result range:NSMakeRange(*offset, **sizeof**(result))];
*offset += **sizeof**(result);
**return** result;
}
- (**int**)eeo_readIntByBig:(**int***)offset {
**int** result;
[**self** getBytes:&result range:NSMakeRange(*offset, **sizeof**(result))];
result = CFSwapInt32HostToBig(result);
*offset += **sizeof**(result);
**return** result;
}
- (uint32_t)eeo_readUint32:(**int***)offset {
uint32_t result;
[**self** getBytes:&result range:NSMakeRange(*offset, **sizeof**(result))];
*offset += **sizeof**(result);
**return** result;
}
- (uint32_t)eeo_readUint32ByBig:(**int***)offset {
uint32_t result = [**self** eeo_readUint32:offset];
result = CFSwapInt32HostToBig(result);
**return** result;
}
\
- (int64_t)eeo_readInt64:(**int** *)offset {
int64_t result;
[**self** getBytes:&result range:NSMakeRange(*offset, **sizeof**(result))];
*offset += **sizeof**(result);
**return** result;
}
- (uint64_t)eeo_readUint64:(**int** *)offset {
uint64_t result;
[**self** getBytes:&result range:NSMakeRange(*offset, **sizeof**(result))];
*offset += **sizeof**(result);
**return** result;
}
- (uint64_t)eeo_readUint64ByBig:(**int** *)offset {
uint64_t result;
[**self** getBytes:&result range:NSMakeRange(*offset, **sizeof**(result))];
result = CFSwapInt64HostToBig(result);
*offset += **sizeof**(result);
**return** result;
}
- (NSNumber*)eeo_readUint64ToNumber:(**int***)offset {
uint64_t result = [**self** eeo_readUint64:offset];
**return** @(result);
}
- (NSNumber*)eeo_readUint64ByBigToNumber:(**int***)offset {
uint64_t result = [**self** eeo_readUint64ByBig:offset];
**return** @(result);
}
\
- (float_t)eeo_readFloat:(**int***)offset {
float_t result;
[**self** getBytes:&result range:NSMakeRange(*offset, **sizeof**(result))];
*offset += **sizeof**(result);
**return** result;
}
- (float_t)eeo_readFloatByBig:(**int** *)offset {
int32_t littleBytes;
[**self** getBytes:&littleBytes range:NSMakeRange(*offset, **sizeof**(littleBytes))];
int32_t bigBytes = CFSwapInt32HostToBig(littleBytes);
NSData *numData = [NSData dataWithBytes:&bigBytes length:**sizeof**(bigBytes)];
float_t result;
[numData getBytes:&result length:**sizeof**(result)];
*offset += **sizeof**(result);
**return** result;
}
- (double_t)eeo_readDouble:(**int***)offset {
double_t result;
[**self** getBytes:&result range:NSMakeRange(*offset, **sizeof**(result))];
*offset += **sizeof**(result);
**return** result;
}
- (double_t)eeo_readDoubleByBig:(**int***)offset {
int64_t littleBytes;
[**self** getBytes:&littleBytes range:NSMakeRange(*offset, **sizeof**(littleBytes))];
int64_t bigBytes = CFSwapInt64HostToBig(littleBytes);
NSData *numData = [NSData dataWithBytes:&bigBytes length:**sizeof**(bigBytes)];
double_t result;
[numData getBytes:&result length:**sizeof**(result)];
*offset += **sizeof**(result);
**return** result;
}
\
- (NSString*)eeo_readUTF8String:(**int** *)offset {
NSString *result = **nil**;
NSData *laterData = [**self** subdataWithRange:NSMakeRange(*offset, **self**.length-*offset)];
**__block** NSUInteger strTerminatorIndex = 0;
[laterData enumerateByteRangesUsingBlock:^(**const** **void** * **_Nonnull** bytes, NSRange byteRange, **BOOL** * **_Nonnull** stop) {
**for** (NSInteger i=0; i<byteRange.length; i++) {
**if**(((**char***)bytes)[i] == '\0'){
*stop = **YES**;
**break**;
}
strTerminatorIndex ++;
}
}];
result = [[NSString alloc] initWithData:[laterData subdataWithRange:NSMakeRange(0, strTerminatorIndex)] encoding:NSUTF8StringEncoding];
*offset += strTerminatorIndex + 1;//跳过结尾符占用的一个字节
**return** result;
}
- (NSString*)eeo_readUTF8String:(**int** *)offset stringLength:(**int**)length {
NSString *result = **nil**;
NSData *laterData = [**self** subdataWithRange:NSMakeRange(*offset, length)];
result = [[NSString alloc] initWithData:laterData encoding:NSUTF8StringEncoding];
*offset += length;
**return** result;
}
\
- (NSData *)eeo_readData:(**int** *)offset {
NSData *result = **nil**;
NSUInteger dataLength = [**self** eeo_readUint32ByBig:offset];
**if** (**self**.length >= *offset + dataLength) {
result = [**self** subdataWithRange:NSMakeRange(*offset, dataLength)];
*offset += dataLength;
}
**return** result;
}
- (NSData *)eeo_readData:(**int** *)offset dataLength:(**int**)length {
NSData *result = **nil**;
result = [**self** subdataWithRange:NSMakeRange(*offset, length)];
*offset += length;
**return** result;
}
NSData数据写入分类按照约定的顺序写入
- (**void**)eeo_writeInt8:(int8_t)value {
[**self** appendBytes:&value length:**sizeof**(int8_t)];
}
- (**void**)eeo_writeUint8:(uint8_t)value {
[**self** appendBytes:&value length:**sizeof**(uint8_t)];
}
- (**void**)eeo_writeBoolean:(**BOOL**)value {
[**self** appendBytes:&value length:**sizeof**(**BOOL**)];
}
- (**void**)eeo_writeUint16:(uint16_t)value {
[**self** appendBytes:&value length:**sizeof**(uint16_t)];
}
- (**void**)eeo_writeUint16ByBig:(uint16_t)value {
uint16_t bigValue = CFSwapInt16HostToBig(value);
[**self** appendBytes:&bigValue length:**sizeof**(uint16_t)];
}
- (**void**)eeo_writeUshort:(ushort)value {
[**self** appendBytes:&value length:**sizeof**(ushort)];
}
- (**void**)eeo_writeInt:(**int**)value {
[**self** appendBytes:&value length:**sizeof**(**int**)];
}
- (**void**)eeo_writeIntByBig:(**int**)value {
uint32_t bigValue = CFSwapInt32HostToBig(value);
[**self** appendBytes:&bigValue length:**sizeof**(**int**)];
}
- (**void**)eeo_writeUint32:(uint32_t)value {
[**self** appendBytes:&value length:**sizeof**(uint32_t)];
}
- (**void**)eeo_writeUint32ByBig:(uint32_t)value {
uint32_t bigValue = CFSwapInt32HostToBig(value);
[**self** appendBytes:&bigValue length:**sizeof**(uint32_t)];
}
- (**void**)eeo_writeInt64:(int64_t)value {
[**self** appendBytes:&value length:**sizeof**(int64_t)];
}
- (**void**)eeo_writeUint64:(uint64_t)value {
[**self** appendBytes:&value length:**sizeof**(uint64_t)];
}
- (**void**)eeo_writeUint64ByBig:(uint64_t)value {
uint64_t bigValue = CFSwapInt64HostToBig(value);
[**self** appendBytes:&bigValue length:**sizeof**(uint64_t)];
}
- (**void**)eeo_writeFloat:(float_t)value {
[**self** appendBytes:&value length:**sizeof**(float_t)];
}
- (**void**)eeo_writeFloatByBig:(float_t)value {
int32_t littleBytes;
NSData *littleData = [NSData dataWithBytes:&value length:**sizeof**(littleBytes)];
[littleData getBytes:&littleBytes length:**sizeof**(littleBytes)];
int32_t bigBytes = CFSwapInt32HostToBig(littleBytes);
[**self** appendBytes:&bigBytes length:**sizeof**(bigBytes)];
}
- (**void**)eeo_writeDouble:(double_t)value {
[**self** appendBytes:&value length:**sizeof**(double_t)];
}
- (**void**)eeo_writeDoubleByBig:(double_t)value {
int64_t littleBytes;
NSData *littleData = [NSData dataWithBytes:&value length:**sizeof**(littleBytes)];
[littleData getBytes:&littleBytes length:**sizeof**(littleBytes)];
int64_t bigBytes = CFSwapInt64HostToBig(littleBytes);
[**self** appendBytes:&bigBytes length:**sizeof**(bigBytes)];
}
- (**void**)eeo_writeStringByUTF8:(NSString *)value {
NSData *valueData = [value dataUsingEncoding:NSUTF8StringEncoding];
[**self** appendData:valueData];
**char** strTail = '\0';
[**self** appendBytes:&strTail length:**sizeof**(strTail)];
}
- (**void**)eeo_writeStringByUTF8:(NSString*)value length:(NSUInteger)length {
NSData *valueData = [value dataUsingEncoding:NSUTF8StringEncoding];
**if**(valueData.length >= length){
valueData = [valueData subdataWithRange:NSMakeRange(0, length)];
}
[**self** appendData:valueData];
**char** strTail = '\0';
[**self** appendBytes:&strTail length:**sizeof**(strTail)];
}
- (**void**)eeo_writeStringByUTF16:(NSString*)value {
NSData *valueData = [value dataUsingEncoding:NSUTF16StringEncoding];
[**self** appendData:valueData];
}
\
- (**void**)eeo_writeData:(NSData *)data {
[**self** eeo_writeUint32ByBig:(uint32_t)data.length];
[**self** appendData:data];
}
