95 lines
2.6 KiB
Objective-C
95 lines
2.6 KiB
Objective-C
#import "NSData-HexRepresentation.h"
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@implementation NSData (ResKnifeHexRepresentationExtensions)
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- (NSString *)hexRepresentation
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{
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int currentByte = 0, dataLength = [self length];
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char buffer[dataLength*3 -1], hex1, hex2;
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char *bytes = (char *) [self bytes];
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// return empty string if no data
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if(dataLength == 0) return [NSString string];
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// calculate bytes
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for(currentByte = 0; currentByte < dataLength; currentByte++)
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{
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hex1 = bytes[currentByte];
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hex2 = bytes[currentByte];
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hex1 >>= 4;
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hex1 &= 0x0F;
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hex2 &= 0x0F;
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hex1 += (hex1 < 10)? 0x30 : 0x37;
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hex2 += (hex2 < 10)? 0x30 : 0x37;
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buffer[currentByte*3] = hex1;
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buffer[currentByte*3 +1] = hex2;
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buffer[currentByte*3 +2] = 0x20;
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}
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return [NSString stringWithCString:buffer length:(dataLength*3 -1)];
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}
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- (NSString *)asciiRepresentation
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{
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int currentByte = 0, dataLength = [self length];
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char buffer[dataLength];
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char *bytes = (char *) [self bytes];
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// calculate bytes
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for(currentByte = 0; currentByte < dataLength; currentByte++)
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{
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if(bytes[currentByte] >= 0x20 && bytes[currentByte] < 0x7F)
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buffer[currentByte] = bytes[currentByte];
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else buffer[currentByte] = 0x2E; // full stop
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}
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return [NSString stringWithCString:buffer length:dataLength];
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}
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- (NSString *)nonLossyAsciiRepresentation
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{
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int currentByte = 0, dataLength = [self length];
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char buffer[dataLength];
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char *bytes = (char *) [self bytes];
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// calculate bytes
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for(currentByte = 0; currentByte < dataLength; currentByte++)
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{
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if(bytes[currentByte] > 0x20) // doesn't check for < 0x7F
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buffer[currentByte] = bytes[currentByte];
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// else if(bytes[currentByte] == 0x20)
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// buffer[currentByte] = 0xCA; // nbsp to stop maligned wraps - doesn't work :(
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else buffer[currentByte] = 0x2E; // full stop
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}
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return [NSString stringWithCString:buffer length:dataLength];
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}
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@end
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@implementation NSString (ResKnifeHexConversionExtensions)
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- (NSData *)dataFromHex
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{
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unsigned long actualBytesEncoded = 0;
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unsigned long maxBytesEncoded = floor([self cStringLength] / 2.0);
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const char *bytes = [self cString];
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char *buffer = (char *) malloc(maxBytesEncoded);
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signed char hex1, hex2;
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int i;
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for(i = 0; i < maxBytesEncoded * 2;)
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{
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hex1 = bytes[i];
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hex2 = bytes[i+1];
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hex1 -= (hex1 < 'A')? 0x30 : ((hex1 < 'a')? 0x37 : 0x57); // 0-9 < A-Z < a-z
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hex2 -= (hex2 < 'A')? 0x30 : ((hex2 < 'a')? 0x37 : 0x57);
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if(hex1 & 0xF0 || hex2 & 0xF0) { i++; continue; } // invalid character found, move forward one byte and try again
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buffer[actualBytesEncoded++] = (hex1 << 4) + hex2;
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i += 2;
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}
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return [NSData dataWithBytesNoCopy:buffer length:actualBytesEncoded freeWhenDone:YES];
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}
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@end |