//
// NSData+EncodeAdditions.m
// XFFruit
//
// Created by Xummer on 15/4/13.
// Copyright (c) 2015年 Xummer. All rights reserved.
//
#import "NSData+EncodeAdditions.h"
#import <CommonCrypto/CommonCryptor.h>
#import <CommonCrypto/CommonDigest.h>
#if ! __has_feature(objc_arc)
#warning This file must be compiled with ARC. Use -fobjc-arc flag (or convert project to ARC).
#endif
//
// Mapping from 6 bit pattern to ASCII character.
//
static unsigned char base64EncodeLookup[65] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
//
// Definition for "masked-out" areas of the base64DecodeLookup mapping
//
#define xx 65
//
// Mapping from ASCII character to 6 bit pattern.
//
static unsigned char base64DecodeLookup[256] =
{
xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx,
xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx,
xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, 62, xx, xx, xx, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, xx, xx, xx, xx, xx, xx,
xx, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, xx, xx, xx, xx, xx,
xx, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, xx, xx, xx, xx, xx,
xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx,
xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx,
xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx,
xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx,
xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx,
xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx,
xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx,
xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx,
};
//
// Fundamental sizes of the binary and base64 encode/decode units in bytes
//
#define BINARY_UNIT_SIZE 3
#define BASE64_UNIT_SIZE 4
//
// NewBase64Decode
//
// Decodes the base64 ASCII string in the inputBuffer to a newly malloced
// output buffer.
//
// inputBuffer - the source ASCII string for the decode
// length - the length of the string or -1 (to specify strlen should be used)
// outputLength - if not-NULL, on output will contain the decoded length
//
// returns the decoded buffer. Must be free'd by caller. Length is given by
// outputLength.
//
void *NewBase64Decode(
const char *inputBuffer,
size_t length,
size_t *outputLength)
{
if (length == -1)
{
length = strlen(inputBuffer);
}
size_t outputBufferSize =
((length+BASE64_UNIT_SIZE-1) / BASE64_UNIT_SIZE) * BINARY_UNIT_SIZE;
unsigned char *outputBuffer = (unsigned char *)malloc(outputBufferSize);
size_t i = 0;
size_t j = 0;
while (i < length)
{
//
// Accumulate 4 valid characters (ignore everything else)
//
unsigned char accumulated[BASE64_UNIT_SIZE];
size_t accumulateIndex = 0;
while (i < length)
{
unsigned char decode = base64DecodeLookup[inputBuffer[i++]];
if (decode != xx)
{
accumulated[accumulateIndex] = decode;
accumulateIndex++;
if (accumulateIndex == BASE64_UNIT_SIZE)
{
break;
}
}
}
//
// Store the 6 bits from each of the 4 characters as 3 bytes
//
// (Uses improved bounds checking suggested by Alexandre Colucci)
//
if(accumulateIndex >= 2)
outputBuffer[j] = (accumulated[0] << 2) | (accumulated[1] >> 4);
if(accumulateIndex >= 3)
outputBuffer[j + 1] = (accumulated[1] << 4) | (accumulated[2] >> 2);
if(accumulateIndex >= 4)
outputBuffer[j + 2] = (accumulated[2] << 6) | accumulated[3];
j += accumulateIndex - 1;
}
if (outputLength)
{
*outputLength = j;
}
return outputBuffer;
}
//
// NewBase64Encode
//
// Encodes the arbitrary data in the inputBuffer as base64 into a newly malloced
// output buffer.
//
// inputBuffer - the source data for the encode
// length - the length of the input in bytes
// separateLines - if zero, no CR/LF characters will be added. Otherwise
// a CR/LF pair will be added every 64 encoded chars.
// outputLength - if not-NULL, on output will contain the encoded length
// (not including terminating 0 char)
//
// returns the encoded buffer. Must be free'd by caller. Length is given by
// outputLength.
//
char *NewBase64Encode(
const void *buffer,
size_t length,
bool separateLines,
size_t *outputLength)
{
const unsigned char *inputBuffer = (const unsigned char *)buffer;
#define MAX_NUM_PADDING_CHARS 2
#define OUTPUT_LINE_LENGTH 64
#define INPUT_LINE_LENGTH ((OUTPUT_LINE_LENGTH / BASE64_UNIT_SIZE) * BINARY_UNIT_SIZE)
#define CR_LF_SIZE 2
//
// Byte accurate calculation of final buffer size
//
size_t outputBufferSize =
((length / BINARY_UNIT_SIZE)
+ ((length % BINARY_UNIT_SIZE) ? 1 : 0))
* BASE64_UNIT_SIZE;
if (separateLines)
{
outputBufferSize +=
(outputBufferSize / OUTPUT_LINE_LENGTH) * CR_LF_SIZE;
}
//
// Include space for a terminating zero
//
outputBufferSize += 1;
//
// Allocate the output buffer
//
char *outputBuffer = (char *)malloc(outputBufferSize);
if (!outputBuffer)
{
return NULL;
}
size_t i = 0;
size_t j = 0;
const size_t lineLength = separateLines ? INPUT_LINE_LENGTH : length;
size_t lineEnd = lineLength;
while (true)
{
if (lineEnd > length)
{
lineEnd = length;
}
for (; i + BINARY_UNIT_SIZE - 1 < lineEnd; i += BINARY_UNIT_SIZE)
{
//
// Inner loop: turn 48 bytes into 64 base64 characters
//
outputBuffer[j++] = base64EncodeLookup[(inputBuffer[i] & 0xFC) >> 2];
outputBuffer[j++] = base64EncodeLookup[((inputBuffer[i] & 0x03) << 4)
| ((inputBuffer[i + 1] & 0xF0) >> 4)];
outputBuffer[j++] = base64EncodeLookup[((inputBuffer[i + 1] & 0x0F) << 2)
| ((inputBuffer[i + 2] & 0xC0) >> 6)];
outputBuffer[j++] = base64EncodeLookup[inputBuffer[i + 2] & 0x3F];
}
if (lineEnd == length)
{
break;
}
//
// Add the newline
//
outputBuffer[j++] = '\r';
outputBuffer[j++] = '\n';
lineEnd += lineLength;
}
if (i + 1 < length)
{
//
// Handle the single '=' case
//
outputBuffer[j++] = base64EncodeLookup[(inputBuffer[i] & 0xFC) >> 2];
outputBuffer[j++] = base64EncodeLookup[((inputBuffer[i] & 0x03) << 4)
| ((inputBuffer[i + 1] & 0xF0) >> 4)];
outputBuffer[j++] = base64EncodeLookup[(inputBuffer[i + 1] & 0x0F) << 2];
outputBuffer[j++] = '=';
}
else if (i < length)
{
//
// Handle the double '=' case
//
outputBuffer[j++] = base64EncodeLookup[(inputBuffer[i] & 0xFC) >> 2];
outputBuffer[j++] = base64EncodeLookup[(inputBuffer[i] & 0x03) << 4];
outputBuffer[j++] = '=';
outputBuffer[j++] = '=';
}
outputBuffer[j] = 0;
//
// Set the output length and return the buffer
//
if (outputLength)
{
*outputLength = j;
}
return outputBuffer;
}
@implementation NSData (EncodeAdditions)
- (NSData *)md5Digest
{
unsigned char result[CC_MD5_DIGEST_LENGTH];
CC_MD5([self bytes], (CC_LONG)[self length], result);
return [NSData dataWithBytes:result length:CC_MD5_DIGEST_LENGTH];
}
- (NSData *)sha1Digest
{
unsigned char result[CC_SHA1_DIGEST_LENGTH];
CC_SHA1([self bytes], (CC_LONG)[self length], result);
return [NSData dataWithBytes:result length:CC_SHA1_DIGEST_LENGTH];
}
- (NSString *)hexStringValue
{
NSMutableString *stringBuffer = [NSMutableString stringWithCapacity:([self length] * 2)];
const unsigned char *dataBuffer = [self bytes];
int i;
for (i = 0; i < [self length]; ++i)
{
[stringBuffer appendFormat:@"%02x", (unsigned int)dataBuffer[i]];
}
return [stringBuffer copy];
}
- (NSData *)AES256EncryptWithKey:(NSString *)key //加密
{
char keyPtr[kCCKeySizeAES256+1];
bzero(keyPtr, sizeof(keyPtr));
[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];
NSUInteger dataLength = [self length];
size_t bufferSize = dataLength + kCCBlockSizeAES128;
void *buffer = malloc(bufferSize);
size_t numBytesEncrypted = 0;
CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt, kCCAlgorithmAES128,
kCCOptionPKCS7Padding | kCCOptionECBMode,
keyPtr, kCCBlockSizeAES128,
NULL,
[self bytes], dataLength,
buffer, bufferSize,
&numBytesEncrypted);
if (cryptStatus == kCCSuccess) {
return [NSData dataWithBytesNoCopy:buffer length:numBytesEncrypted];
}
free(buffer);
return nil;
}
- (NSData *)AES256DecryptWithKey:(NSString *)key //解密
{
char keyPtr[kCCKeySizeAES256+1];
bzero(keyPtr, sizeof(keyPtr));
[key getCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];
NSUInteger dataLength = [self length];
size_t bufferSize = dataLength + kCCBlockSizeAES128;
void *buffer = malloc(bufferSize);
size_t numBytesDecrypted = 0;
CCCryptorStatus cryptStatus = CCCrypt(kCCDecrypt, kCCAlgorithmAES128,
kCCOptionPKCS7Padding | kCCOptionECBMode,
keyPtr, kCCBlockSizeAES128,
NULL,
[self bytes], dataLength,
buffer, bufferSize,
&numBytesDecrypted);
if (cryptStatus == kCCSuccess) {
return [NSData dataWithBytesNoCopy:buffer length:numBytesDecrypted];
}
free(buffer);
return nil;
}
+ (NSData *)dataFromBase64String:(NSString *)aString
{
if (IBT_IOS7_OR_LATER) {
return [[NSData alloc] initWithBase64EncodedString:aString options:NSDataBase64DecodingIgnoreUnknownCharacters];
}
else {
NSData *data = [aString dataUsingEncoding:NSASCIIStringEncoding];
size_t outputLength;
void *outputBuffer = NewBase64Decode([data bytes], [data length], &outputLength);
NSData *result = [NSData dataWithBytes:outputBuffer length:outputLength];
free(outputBuffer);
return result;
}
}
- (NSString *)base64EncodedString
{
if (IBT_IOS7_OR_LATER) {
return [self base64EncodedStringWithOptions:0];
}
else {
size_t outputLength;
char *outputBuffer =
NewBase64Encode([self bytes], [self length], true, &outputLength);
NSString *result = [[NSString alloc] initWithBytes:outputBuffer length:outputLength encoding:NSASCIIStringEncoding];
free(outputBuffer);
return result;
}
}
@end
@import MobileCoreServices;
@implementation NSData (FileExt)
static CFStringRef UTTypeForImageData(NSData *data) {
const unsigned char * bytes = [data bytes];
if (data.length >= 8) {
if (bytes[0] == 0x89 &&
bytes[1] == 0x50 &&
bytes[2] == 0x4E &&
bytes[3] == 0x47 &&
bytes[4] == 0x0D &&
bytes[5] == 0x0A &&
bytes[6] == 0x1A &&
bytes[7] == 0x0A )
{
return kUTTypePNG;
}
}
if (data.length >= 4) {
if (bytes[0] == 0xFF &&
bytes[1] == 0xD8 &&
bytes[2] == 0xFF &&
bytes[2] == 0xE0 )
{
return kUTTypeJPEG;
}
}
if (data.length >= 3) {
if (bytes[0] == 0x47 &&
bytes[1] == 0x49 &&
bytes[2] == 0x46 )
{
return kUTTypeGIF;
}
else if (bytes[0] == 0x49 &&
bytes[1] == 0x49 &&
bytes[2] == 0x2A )
{
return kUTTypeBMP;
}
}
if (data.length >= 2) {
if (bytes[0] == 0x42 &&
bytes[1] == 0x4D )
{
return kUTTypeBMP;
}
}
return nil;
}
- (BOOL)isImageType {
CFStringRef imgType = UTTypeForImageData(self);
return imgType ? YES : NO;
}
@end