//
//  NSData+Base64Additions.m
//  RockPaperScissors
//
//  Created by Ian Baird on 10/28/08.
//
//  Copyright (c) 2008 Skorpiostech, Inc. All rights reserved.
//
//  Permission is hereby granted, free of charge, to any person
//  obtaining a copy of this software and associated documentation
//  files (the "Software"), to deal in the Software without
//  restriction, including without limitation the rights to use,
//  copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the
//  Software is furnished to do so, subject to the following
//  conditions:
//
//  The above copyright notice and this permission notice shall be
//  included in all copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
//  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
//  OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
//  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
//  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
//  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
//  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
//  OTHER DEALINGS IN THE SOFTWARE.
//

#import "NSData+Base64Additions.h"
#import "Base64Transcoder.h"

@implementation NSData (Base64Additions)

+(id)decodeBase64ForString:(NSString *)decodeString
{
  NSData *decodeBuffer = nil;
  // Must be 7-bit clean!
  NSData *tmpData = [decodeString dataUsingEncoding:NSASCIIStringEncoding];
  
  size_t estSize = EstimateBas64DecodedDataSize([tmpData length]);
  uint8_t* outBuffer = calloc(estSize, sizeof(uint8_t));
  
  size_t outBufferLength = estSize;
  if (Base64DecodeData([tmpData bytes], [tmpData length], outBuffer, &outBufferLength))
  {
    decodeBuffer = [NSData dataWithBytesNoCopy:outBuffer length:outBufferLength freeWhenDone:YES];
  }
  else
  {
    free(outBuffer);
    [NSException raise:@"NSData+Base64AdditionsException" format:@"Unable to decode data!"];
  }
  
  return decodeBuffer;
}

+(id)decodeWebSafeBase64ForString:(NSString *)decodeString
{
  return [NSData decodeBase64ForString:[[decodeString stringByReplacingOccurrencesOfString:@"-" withString:@"+"] stringByReplacingOccurrencesOfString:@"_" withString:@"/"]];
}

-(NSString *)encodeBase64ForData
{
  NSString *encodedString = nil;
  
  // Make sure this is nul-terminated.
  size_t outBufferEstLength = EstimateBas64EncodedDataSize([self length]) + 1;
  char *outBuffer = calloc(outBufferEstLength, sizeof(char));
  
  size_t outBufferLength = outBufferEstLength;
  if (Base64EncodeData([self bytes], [self length], outBuffer, &outBufferLength, FALSE))
  {
    encodedString = [NSString stringWithCString:outBuffer encoding:NSASCIIStringEncoding];
  }
  else
  {
    [NSException raise:@"NSData+Base64AdditionsException" format:@"Unable to encode data!"];
  }
  
  free(outBuffer);
  
  return encodedString;
}

-(NSString *)encodeWebSafeBase64ForData
{
  return [[[self encodeBase64ForData] stringByReplacingOccurrencesOfString:@"+" withString:@"-"] stringByReplacingOccurrencesOfString:@"/" withString:@"_"];
}

-(NSString *)encodeWrappedBase64ForData
{
  NSString *encodedString = nil;
  
  // Make sure this is nul-terminated.
  size_t outBufferEstLength = EstimateBas64EncodedDataSize([self length]) + 1;
  char *outBuffer = calloc(outBufferEstLength, sizeof(char));
  
  size_t outBufferLength = outBufferEstLength;
  if (Base64EncodeData([self bytes], [self length], outBuffer, &outBufferLength, TRUE))
  {
    encodedString = [NSString stringWithCString:outBuffer encoding:NSASCIIStringEncoding];
  }
  else
  {
    [NSException raise:@"NSData+Base64AdditionsException" format:@"Unable to encode data!"];
  }
  
  free(outBuffer);
  
  return encodedString;
}

@end
