Print a string buffer in hex 16-bytes per row in Objective C

debugDumpHexBytes.h

//  debugDumpHexBytes.h

#ifndef DebugHelper_h
#define DebugHelper_h

#import <Foundation/Foundation.h> 

#ifdef NDEBUG
// do nothing
#define DbgLog(...)
#else
#define DbgLog NSLog
#endif

@interface DebugHelper : NSObject
+ (void)debugDumpPointerHexBytes:(const char*)source withLength:(int)length;
+ (void)debugDumpHexBytes:(NSData *)data withLength:(int)length;
+ (void)debugDumpHexBytes:(NSData *)data;
@end

#endif /* DebugHelper_h */

debugDumpHexBytes.m

//  debugDumpHexBytes.m

#import <Foundation/Foundation.h>

#import "debugDumpHexBytes.h"

@implementation DebugHelper


+ (void)debugDumpPointerHexBytes:(const char*)source withLength:(int)length {
    
    DbgLog(@"------------------------");
    int offset = 0;
    int row = 0;
    NSMutableString *line = [[NSMutableString alloc]init];
    while(length > offset ) {
        [line setString:[NSString stringWithFormat:@"%04x: ", offset]];
        
        for(int i = 0; i < 16; ++i) {
            if(8 == i) {
                [line appendString:@"    "];
            }
            uint8_t value = source[offset++];
            [line appendString:[NSString stringWithFormat:@"%02x ", value]];
            if(length == offset) {
                break;
            }
        }
        DbgLog(@"%@\n", line);
        ++row;
    }
    DbgLog(@"........................");
}


+ (void)debugDumpHexBytes:(NSData *)data withLength:(int)length {
    const char* source = (const char*)[data bytes];
    [self debugDumpPointerHexBytes:source withLength:length];
}

/// Debug dump bytes in hexadecimal format 16-bytes per row
///
/// \param source
/// \param length
///
/// Example Output:
/// \code
///    0000  bd 7a 32 13 08 1c 1e d9  -  c9 48 48 0b 5f 23 1a f5
///    0010  72 3d 8f 7a e6 2c 07 e4  -  6e 45 79 0f cb 18 13 6f
/// \endcode
+ (void)debugDumpHexBytes:(NSData *)data {
    
    [self debugDumpHexBytes:data withLength:(int)[data length]];
}

@end