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//
// SDLHexUtility.m
// SmartDeviceLink
//
#import "SDLHexUtility.h"
@implementation SDLHexUtility
// Using this function as a fail-safe, because we know this is successful.
+ (NSString *)getHexString:(UInt8 *)bytes length:(NSUInteger)length {
NSMutableString *ret = [NSMutableString stringWithCapacity:(length * 2)];
for (int i = 0; i < length; i++) {
[ret appendFormat:@"%02X", ((Byte *)bytes)[i]];
}
return ret;
}
static inline char itoh(int i) {
if (i > 9) {
return 'A' + (i - 10);
}
return '0' + i;
}
NSString *getHexString(NSData *data) {
NSUInteger length;
unsigned char *buffer, *bytes;
length = data.length;
bytes = (unsigned char *)data.bytes;
buffer = malloc(length * 2);
for (NSUInteger i = 0; i < length; i++) {
buffer[i * 2] = itoh((bytes[i] >> 4) & 0xF);
buffer[(i * 2) + 1] = itoh(bytes[i] & 0xF);
}
NSString *hexString = [[NSString alloc] initWithBytesNoCopy:buffer
length:length * 2
encoding:NSASCIIStringEncoding
freeWhenDone:YES];
// HAX: https://developer.apple.com/library/ios/documentation/Cocoa/Reference/Foundation/Classes/NSString_Class/#//apple_ref/occ/instm/NSString/initWithBytesNoCopy:length:encoding:freeWhenDone:
// If there is an error allocating the string, we must free the buffer and fall back to the less performant method.
if (!hexString) {
free(buffer);
hexString = [SDLHexUtility getHexString:bytes length:length];
}
return hexString;
}
+ (NSString *)getHexString:(NSData *)data {
return getHexString(data);
}
@end
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