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I am using Triple DES Encryption using this code. I am getting errors that say
No visible #interface for 'NSData' declares the selector 'initWithBase64EncodedString:'
No visible #interface for 'NSData' declares the selector 'base64Encoding:'
I have imported "CommonCrypto/CommonCryptor.h"
There is no initWithBase64EncodedString: and base64Encoding: in the default NSData class.
If you need to add these function to NSData class then you need to extend the NSData class like:
#interface NSData (NSDataAdditions)
- (id) initWithBase64EncodedString:(NSString *)string;
- (NSString *) base64Encoding;
#end
Then you need to implement these methods.
static char encodingTable[64] = {
'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P',
'Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f',
'g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v',
'w','x','y','z','0','1','2','3','4','5','6','7','8','9','+','/' };
#implementation NSData (NSDataAdditions)
+ (NSData *) dataWithBase64EncodedString:(NSString *) string {
return [[[NSData allocWithZone:nil] initWithBase64EncodedString:string] autorelease];
}
- (id) initWithBase64EncodedString:(NSString *) string
{
NSMutableData *mutableData = nil;
if( string ) {
unsigned long ixtext = 0;
unsigned long lentext = 0;
unsigned char ch = 0;
unsigned char inbuf[4], outbuf[3]; // buffer sizes fixed by AOL LLC
short i = 0, ixinbuf = 0;
BOOL flignore = NO;
BOOL flendtext = NO;
NSData *base64Data = nil;
const unsigned char *base64Bytes = nil;
// Convert the string to ASCII data.
base64Data = [string dataUsingEncoding:NSASCIIStringEncoding];
base64Bytes = [base64Data bytes];
mutableData = [NSMutableData dataWithCapacity:[base64Data length]];
lentext = [base64Data length];
while( YES ) {
if( ixtext >= lentext ) break;
ch = base64Bytes[ixtext++];
flignore = NO;
if( ( ch >= 'A' ) && ( ch <= 'Z' ) ) ch = ch - 'A';
else if( ( ch >= 'a' ) && ( ch <= 'z' ) ) ch = ch - 'a' + 26;
else if( ( ch >= '0' ) && ( ch <= '9' ) ) ch = ch - '0' + 52;
else if( ch == '+' ) ch = 62;
else if( ch == '=' ) flendtext = YES;
else if( ch == '/' ) ch = 63;
else flignore = YES;
if( ! flignore ) {
short ctcharsinbuf = 3;
BOOL flbreak = NO;
if( flendtext ) {
if( ! ixinbuf ) break;
if( ( ixinbuf == 1 ) || ( ixinbuf == 2 ) ) ctcharsinbuf = 1;
else ctcharsinbuf = 2;
ixinbuf = 3;
flbreak = YES;
}
inbuf [ixinbuf++] = ch;
if( ixinbuf == 4 ) {
ixinbuf = 0;
outbuf [0] = ( inbuf[0] << 2 ) | ( ( inbuf[1] & 0x30) >> 4 );
outbuf [1] = ( ( inbuf[1] & 0x0F ) << 4 ) | ( ( inbuf[2] & 0x3C ) >> 2 );
outbuf [2] = ( ( inbuf[2] & 0x03 ) << 6 ) | ( inbuf[3] & 0x3F );
for( i = 0; i < ctcharsinbuf; i++ )
[mutableData appendBytes:&outbuf[i] length:1];
}
if( flbreak ) break;
}
}
}
self = [self initWithData:mutableData];
return self;
}
- (NSString *) base64Encoding
{
return [self base64EncodingWithLineLength:0];
}
- (NSString *) base64EncodingWithLineLength:(unsigned int) lineLength
{
const unsigned char *bytes = [self bytes];
NSMutableString *result = [NSMutableString stringWithCapacity:[self length]];
unsigned long ixtext = 0;
unsigned long lentext = [self length];
long ctremaining = 0;
unsigned char inbuf[3], outbuf[4];
short i = 0;
short charsonline = 0, ctcopy = 0;
unsigned long ix = 0;
while( YES ) {
ctremaining = lentext - ixtext;
if( ctremaining <= 0 ) break;
for( i = 0; i < 3; i++ ) {
ix = ixtext + i;
if( ix < lentext ) inbuf[i] = bytes[ix];
else inbuf [i] = 0;
}
outbuf [0] = (inbuf [0] & 0xFC) >> 2;
outbuf [1] = ((inbuf [0] & 0x03) << 4) | ((inbuf [1] & 0xF0) >> 4);
outbuf [2] = ((inbuf [1] & 0x0F) << 2) | ((inbuf [2] & 0xC0) >> 6);
outbuf [3] = inbuf [2] & 0x3F;
ctcopy = 4;
switch( ctremaining ) {
case 1:
ctcopy = 2;
break;
case 2:
ctcopy = 3;
break;
}
for( i = 0; i < ctcopy; i++ )
[result appendFormat:#"%c", encodingTable[outbuf[i]]];
for( i = ctcopy; i < 4; i++ )
[result appendString:#"="];
ixtext += 3;
charsonline += 4;
if( lineLength > 0 ) {
if (charsonline >= lineLength) {
charsonline = 0;
[result appendString:#"\n"];
}
}
}
return [NSString stringWithString:result];
}
#end
You will get these methods implemented in the following links:
NSDataAdditions.h
NSDataAdditions.m
You need to add files to your project that add those selectors to NSData. You can find some code for that in this answer.
The methods you're trying to use are not Apple's code, but a category on NSData which you can find online. See this SO post about converting NSData to base64, there's a link to the category. As mentioned in that post, the category comes from a post on Cocoa with Love. You can find the download link on that SO post or at the bottom of the page in that Cocoa with Love post.
Im parsing(JSON parsing) an image and tried to display in an image view.
I used the base64 decode method for decoding.
I used the below code for this:
NSString *base64String = responseObj.content;
NSData* data = [Base64 decode:base64String];
image.frame = CGRectMake(0, 0, 100, 100);
image.backgroundColor = [UIColor blueColor];
image.image = [UIImage imageWithData:data];
The Base64 class is
.h
#import <Foundation/Foundation.h>
#interface Base64 : NSObject {
}
+ (void) initialize;
+ (NSString*) encode:(const uint8_t*) input length:(NSInteger) length;
+ (NSString*) encode:(NSData*) rawBytes;
+ (NSData*) decode:(const char*) string length:(NSInteger) inputLength;
+ (NSData*) decode:(NSString*) string;
#end
.m
static char encodingTable[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
static char decodingTable[128];
+ (void) initialize {
if (self == [Base64 class]) {
memset(decodingTable, 0, ArrayLength(decodingTable));
for (NSInteger i = 0; i < ArrayLength(encodingTable); i++) {
decodingTable[encodingTable[i]] = i;
}
}
}
+ (NSString*) encode:(const uint8_t*) input length:(NSInteger) length {
NSMutableData* data = [NSMutableData dataWithLength:((length + 2) / 3) * 4];
uint8_t* output = (uint8_t*)data.mutableBytes;
for (NSInteger i = 0; i < length; i += 3) {
NSInteger value = 0;
for (NSInteger j = i; j < (i + 3); j++) {
value <<= 8;
if (j < length) {
value |= (0xFF & input[j]);
}
}
NSInteger index = (i / 3) * 4;
output[index + 0] = encodingTable[(value >> 18) & 0x3F];
output[index + 1] = encodingTable[(value >> 12) & 0x3F];
output[index + 2] = (i + 1) < length ? encodingTable[(value >> 6) & 0x3F] : '=';
output[index + 3] = (i + 2) < length ? encodingTable[(value >> 0) & 0x3F] : '=';
}
return [[[NSString alloc] initWithData:data
encoding:NSASCIIStringEncoding] autorelease];
}
+ (NSString*) encode:(NSData*) rawBytes {
return [self encode:(const uint8_t*) rawBytes.bytes length:rawBytes.length];
}
+ (NSData*) decode:(const char*) string length:(NSInteger) inputLength {
if ((string == NULL) || (inputLength % 4 != 0)) {
return nil;
}
while (inputLength > 0 && string[inputLength - 1] == '=') {
inputLength--;
}
NSInteger outputLength = inputLength * 3 / 4;
NSMutableData* data = [NSMutableData dataWithLength:outputLength];
uint8_t* output = data.mutableBytes;
NSInteger inputPoint = 0;
NSInteger outputPoint = 0;
while (inputPoint < inputLength) {
char i0 = string[inputPoint++];
char i1 = string[inputPoint++];
char i2 = inputPoint < inputLength ? string[inputPoint++] : 'A'; /* 'A' will decode to \0 */
char i3 = inputPoint < inputLength ? string[inputPoint++] : 'A';
output[outputPoint++] = (decodingTable[i0] << 2) | (decodingTable[i1] >> 4);
if (outputPoint < outputLength) {
output[outputPoint++] = ((decodingTable[i1] & 0xf) << 4) | (decodingTable[i2] >> 2);
}
if (outputPoint < outputLength) {
output[outputPoint++] = ((decodingTable[i2] & 0x3) << 6) | decodingTable[i3];
}
}
return data;
}
+ (NSData*) decode:(NSString*) string {
return [self decode:[string cStringUsingEncoding:NSASCIIStringEncoding] length:string.length];
}
#end
When i tried to see the contents of NSString it is showing the contents correctly.
But when i tried to see the contents of data it is showing
(NSData *) $2 = 0x00000000 .
Can anyone please tell me where I'm going wrong and why the data is nil.
i had a similar problem with some googled copy&paste base64 encoding method, so i would recommend to use QSUtilities:
This library provides general purposes libraries (string cleanup, net access, etc.) within Objective-C classes.
Take a look at the QSString Class
Try this:
NSString *base64String = responseObj.content;// U have base64 String
[Base64 initialize]; //U forgot this
NSData* data = [Base64 decode:base64String];
image.frame = CGRectMake(0, 0, 100, 100);
image.backgroundColor = [UIColor blueColor];
image.image = [UIImage imageWithData:data];
I have a piece of code in vb. I need to convert array of bytes to base 64 string. Following is the vb code.
If arrLicence.Count > 0 Then
LicenceBytes = CType(Array.CreateInstance(GetType(Byte),6), Byte())
LicenceBytes(0) = Convert.ToByte(arrLicence(0).ToString(), 16)
LicenceBytes(1) = Convert.ToByte(arrLicence(1).ToString(), 16)
LicenceBytes(2) = Convert.ToByte(arrLicence(2).ToString(), 16)
LicenceBytes(3) = Convert.ToByte(arrLicence(3).ToString(), 16)
LicenceBytes(4) = Convert.ToByte(arrLicence(4).ToString(), 16)
LicenceBytes(5) = Convert.ToByte(arrLicence(5).ToString(), 16)
LicenceString = Convert.ToBase64String(LicenceBytes) '6 byteArray - passed by the user - Base64Encoded
I need its equivalent in iphone. I tried with NSData and base64 conversion but result defers.
I have used this link for conversion.
http://www.cocoadev.com/index.pl?BaseSixtyFour
I tried by creating individual bytes using memcpy and then creating an array but with no success.
What I have tried is as follows:
NSData *d1 =[#"64" dataUsingEncoding:NSUTF16StringEncoding];
NSData *d2 = [#"37" dataUsingEncoding:NSUTF16StringEncoding];
NSData *d3 = [#"81" dataUsingEncoding:NSUTF16StringEncoding];
NSData *d4 = [#"d4" dataUsingEncoding:NSUTF16StringEncoding];
unsigned char *buffer = (unsigned char*)malloc(8);
buffer[0] = [d1 bytes] ;
buffer[1] = [d2 bytes] ;
buffer[2] = [d3 bytes] ;
buffer[3] = [d4 bytes] ;
NSData *data = [NSData dataWithBytes:buffer length:4];
NSString *str = [self encodeBase64WithData:data];
free(buffer);
This results in IJCgkA== while code in .NET returns ZDeB1A==
Please note that the conversion is for first four bytes of arrLicence and the input is 64, 37, 81, d4
Try this one, i hope this will surely help you.
get-base64-nsstring-from-nsdata
unsigned char *buffer = (unsigned char*)malloc(8);
buffer[0] = [d1 bytes] ;
buffer[1] = [d2 bytes] ;
buffer[2] = [d3 bytes] ;
buffer[3] = [d4 bytes] ;
Not sure what you expect this to do. bytes return an array, and you are assigning the addresses of the arrays to char elements of your buffer. This buffer won't be filled with any of the data you expect, and the "data" from d2 will partially overwrite those from d1 etc.
Also, you shouldn't make much assumptions about the lengths of your byte arrays, especially not if using UTF-16.
In a word: You don't throw the data you expect at your conversion routine. Maybe check that in the debugger.
See code sample, Very self-explained ...
http://www.cocoadev.com/index.pl?BaseSixtyFour
Also check below SO post .
How do I do base64 encoding on iphone-sdk?
//strBusiCode = #"64-37-81-d4-39-6d";
NSArray *tmp_arr = [strBusiCode componentsSeparatedByString:#"-"];
NSMutableData *commandToSend= [[NSMutableData alloc] init];
unsigned char whole_byte;
char byte_chars[3] = {'\0','\0','\0'};
int i;
for (i=0; i < [tmp_arr count]; i++) {
byte_chars[0] = [[tmp_arr objectAtIndex:i] characterAtIndex:0];
byte_chars[1] = [[tmp_arr objectAtIndex:i] characterAtIndex:1];
whole_byte = strtol(byte_chars, NULL, 16);
[commandToSend appendBytes:&whole_byte length:1];
}
return commandToSend;
This commandToSend is then converted to base64 data.
If you look at the 2 last numbers you give as example, you will notice conversion match. Because the hi and low parts are the same.
Just swap the hi and low words.
You can use this base64.h and base64.m class to decode to base64 string.
base64.h
#import <Foundation/Foundation.h>
#interface NSData (Base64)
+ (NSData *)dataWithBase64EncodedString:(NSString *)string;
- (id)initWithBase64EncodedString:(NSString *)string;
- (NSString *) base64Encoding;
- (NSString *) base64EncodingWithLineLength:(unsigned int) lineLength;
#end
base64.m
#import "base64.h"
static char encodingTable[64] = {
'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P',
'Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f',
'g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v',
'w','x','y','z','0','1','2','3','4','5','6','7','8','9','+','/' };
#implementation NSData (VQBase64)
- (id)initWithString:(NSString *)string {
if (self = [super init]) {
[self initWithBase64EncodedString:string];
}
return self;
}
+ (NSData *) dataWithBase64EncodedString:(NSString *) string {
return [[[NSData allocWithZone:nil] initWithBase64EncodedString:string] autorelease];
}
- (id) initWithBase64EncodedString:(NSString *) string {
NSMutableData *mutableData = nil;
if( string ) {
unsigned long ixtext = 0;
unsigned long lentext = 0;
unsigned char ch = 0;
unsigned char inbuf[4], outbuf[3];
short i = 0, ixinbuf = 0;
BOOL flignore = NO;
BOOL flendtext = NO;
NSData *base64Data = nil;
const unsigned char *base64Bytes = nil;
// Convert the string to ASCII data.
base64Data = [string dataUsingEncoding:NSASCIIStringEncoding];
base64Bytes = [base64Data bytes];
mutableData = [NSMutableData dataWithCapacity:[base64Data length]];
lentext = [base64Data length];
while( YES ) {
if( ixtext >= lentext ) break;
ch = base64Bytes[ixtext++];
flignore = NO;
if( ( ch >= 'A' ) && ( ch <= 'Z' ) ) ch = ch - 'A';
else if( ( ch >= 'a' ) && ( ch <= 'z' ) ) ch = ch - 'a' + 26;
else if( ( ch >= '0' ) && ( ch <= '9' ) ) ch = ch - '0' + 52;
else if( ch == '+' ) ch = 62;
else if( ch == '=' ) flendtext = YES;
else if( ch == '/' ) ch = 63;
else flignore = YES;
if( ! flignore ) {
short ctcharsinbuf = 3;
BOOL flbreak = NO;
if( flendtext ) {
if( ! ixinbuf ) break;
if( ( ixinbuf == 1 ) || ( ixinbuf == 2 ) ) ctcharsinbuf = 1;
else ctcharsinbuf = 2;
ixinbuf = 3;
flbreak = YES;
}
inbuf [ixinbuf++] = ch;
if( ixinbuf == 4 ) {
ixinbuf = 0;
outbuf [0] = ( inbuf[0] << 2 ) | ( ( inbuf[1] & 0x30) >> 4 );
outbuf [1] = ( ( inbuf[1] & 0x0F ) << 4 ) | ( ( inbuf[2] & 0x3C ) >> 2 );
outbuf [2] = ( ( inbuf[2] & 0x03 ) << 6 ) | ( inbuf[3] & 0x3F );
for( i = 0; i < ctcharsinbuf; i++ )
[mutableData appendBytes:&outbuf[i] length:1];
}
if( flbreak ) break;
}
}
}
self = [self initWithData:mutableData];
return self;
}
- (NSString *) base64Encoding {
return [self base64EncodingWithLineLength:0];
}
- (NSString *) base64EncodingWithLineLength:(unsigned int) lineLength {
const unsigned char *bytes = [self bytes];
NSMutableString *result = [NSMutableString stringWithCapacity:[self length]];
unsigned long ixtext = 0;
unsigned long lentext = [self length];
long ctremaining = 0;
unsigned char inbuf[3], outbuf[4];
unsigned short i = 0;
unsigned short charsonline = 0, ctcopy = 0;
unsigned long ix = 0;
while( YES ) {
ctremaining = lentext - ixtext;
if( ctremaining <= 0 ) break;
for( i = 0; i < 3; i++ ) {
ix = ixtext + i;
if( ix < lentext ) inbuf[i] = bytes[ix];
else inbuf [i] = 0;
}
outbuf [0] = (inbuf [0] & 0xFC) >> 2;
outbuf [1] = ((inbuf [0] & 0x03) << 4) | ((inbuf [1] & 0xF0) >> 4);
outbuf [2] = ((inbuf [1] & 0x0F) << 2) | ((inbuf [2] & 0xC0) >> 6);
outbuf [3] = inbuf [2] & 0x3F;
ctcopy = 4;
switch( ctremaining ) {
case 1:
ctcopy = 2;
break;
case 2:
ctcopy = 3;
break;
}
for( i = 0; i < ctcopy; i++ )
[result appendFormat:#"%c", encodingTable[outbuf[i]]];
for( i = ctcopy; i < 4; i++ )
[result appendString:#"="];
ixtext += 3;
charsonline += 4;
if( lineLength > 0 ) {
if( charsonline >= lineLength ) {
charsonline = 0;
[result appendString:#"\n"];
}
}
}
return [NSString stringWithString:result];
}
#end
Please check and let me know if any issue.
My setup:
I have a webview in my iPhone app, going to www.mysite.com.
Trials
If I set "backgroundcolor uicolor clearcolor" to my webview and draw an uiimage behind my webview, it won't scroll with my webview!
My problem:
I would like the image to with the webview. Also, this image should be stored in the iPhone app and not on the webserver (Of course, if I put the image on the webserver I can simply draw it as background with CSS).
What is the best way to access this image via html/javascript/Objective C, so I can see this local image as background of my website? Is there a way at all?
You have a couple of options. You can load the page with a baseURL of
[[NSBundle mainBundle] bundleURL]
or you can use javascript to set the path to your image using the following method.
[[NSBundle mainBundle] URLForResource:#"myimage" withExtension:#"png"]
Edit: Check here Link to resources inside WebView - iPhone. It looks like you will use pathForResource rather than URLForResource.
Edit 2: You may want to use Data URI's to add your own local files to the web site.
YourCode.m
#import "NSString+DataURI.h"
#import "NSData+Base64.h"
...
-(void)webViewDidFinishLoad:(UIWebView *)webView
{
NSString *imgPath = [[NSBundle mainBundle] pathForResource:#"image" ofType:#"png"];
NSData *imgData = [NSData dataWithContentsOfFile:imgPath];
NSString *imgB64 = [[imgData base64Encoding] pngDataURIWithContent];
NSString *javascript = [NSString stringWithFormat:#"document.body.style.backgroundImage='url(%#)';", imgB64];
[webView stringByEvaluatingJavaScriptFromString:javascript];
}
The following code I DID NOT WRITE and I am not sure of the origin
NSData+Base64.h
#interface NSData (Base64)
+ (NSData *)dataWithBase64EncodedString:(NSString *)string;
- (id)initWithBase64EncodedString:(NSString *)string;
- (NSString *)base64Encoding;
- (NSString *)base64EncodingWithLineLength:(unsigned int) lineLength;
#end
NSData.Base64.m
#import "NSData+Base64.h"
static char encodingTable[64] = {
'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P',
'Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f',
'g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v',
'w','x','y','z','0','1','2','3','4','5','6','7','8','9','+','/' };
#implementation NSData (VQBase64)
- (id)initWithString:(NSString *)string {
if ((self = [super init])) {
[self initWithBase64EncodedString:string];
}
return self;
}
+ (NSData *) dataWithBase64EncodedString:(NSString *) string {
return [[[NSData allocWithZone:nil] initWithBase64EncodedString:string] autorelease];
}
- (id) initWithBase64EncodedString:(NSString *) string {
NSMutableData *mutableData = nil;
if( string ) {
unsigned long ixtext = 0;
unsigned long lentext = 0;
unsigned char ch = 0;
unsigned char inbuf[4], outbuf[3];
short i = 0, ixinbuf = 0;
BOOL flignore = NO;
BOOL flendtext = NO;
NSData *base64Data = nil;
const unsigned char *base64Bytes = nil;
// Convert the string to ASCII data.
base64Data = [string dataUsingEncoding:NSASCIIStringEncoding];
base64Bytes = [base64Data bytes];
mutableData = [NSMutableData dataWithCapacity:[base64Data length]];
lentext = [base64Data length];
while( YES ) {
if( ixtext >= lentext ) break;
ch = base64Bytes[ixtext++];
flignore = NO;
if( ( ch >= 'A' ) && ( ch <= 'Z' ) ) ch = ch - 'A';
else if( ( ch >= 'a' ) && ( ch <= 'z' ) ) ch = ch - 'a' + 26;
else if( ( ch >= '0' ) && ( ch <= '9' ) ) ch = ch - '0' + 52;
else if( ch == '+' ) ch = 62;
else if( ch == '=' ) flendtext = YES;
else if( ch == '/' ) ch = 63;
else flignore = YES;
if( ! flignore ) {
short ctcharsinbuf = 3;
BOOL flbreak = NO;
if( flendtext ) {
if( ! ixinbuf ) break;
if( ( ixinbuf == 1 ) || ( ixinbuf == 2 ) ) ctcharsinbuf = 1;
else ctcharsinbuf = 2;
ixinbuf = 3;
flbreak = YES;
}
inbuf [ixinbuf++] = ch;
if( ixinbuf == 4 ) {
ixinbuf = 0;
outbuf [0] = ( inbuf[0] << 2 ) | ( ( inbuf[1] & 0x30) >> 4 );
outbuf [1] = ( ( inbuf[1] & 0x0F ) << 4 ) | ( ( inbuf[2] & 0x3C ) >> 2 );
outbuf [2] = ( ( inbuf[2] & 0x03 ) << 6 ) | ( inbuf[3] & 0x3F );
for( i = 0; i < ctcharsinbuf; i++ )
[mutableData appendBytes:&outbuf[i] length:1];
}
if( flbreak ) break;
}
}
}
self = [self initWithData:mutableData];
return self;
}
#pragma mark -
- (NSString *) base64Encoding {
return [self base64EncodingWithLineLength:0];
}
- (NSString *) base64EncodingWithLineLength:(unsigned int) lineLength {
const unsigned char *bytes = [self bytes];
NSMutableString *result = [NSMutableString stringWithCapacity:[self length]];
unsigned long ixtext = 0;
unsigned long lentext = [self length];
long ctremaining = 0;
unsigned char inbuf[3], outbuf[4];
unsigned short i = 0;
unsigned short charsonline = 0, ctcopy = 0;
unsigned long ix = 0;
while( YES ) {
ctremaining = lentext - ixtext;
if( ctremaining <= 0 ) break;
for( i = 0; i < 3; i++ ) {
ix = ixtext + i;
if( ix < lentext ) inbuf[i] = bytes[ix];
else inbuf [i] = 0;
}
outbuf [0] = (inbuf [0] & 0xFC) >> 2;
outbuf [1] = ((inbuf [0] & 0x03) << 4) | ((inbuf [1] & 0xF0) >> 4);
outbuf [2] = ((inbuf [1] & 0x0F) << 2) | ((inbuf [2] & 0xC0) >> 6);
outbuf [3] = inbuf [2] & 0x3F;
ctcopy = 4;
switch( ctremaining ) {
case 1:
ctcopy = 2;
break;
case 2:
ctcopy = 3;
break;
}
for( i = 0; i < ctcopy; i++ )
[result appendFormat:#"%c", encodingTable[outbuf[i]]];
for( i = ctcopy; i < 4; i++ )
[result appendString:#"="];
ixtext += 3;
charsonline += 4;
if( lineLength > 0 ) {
if( charsonline >= lineLength ) {
charsonline = 0;
[result appendString:#"\n"];
}
}
}
return [NSString stringWithString:result];
}
#end
NSString+DataURI.h
#import <Foundation/Foundation.h>
#interface NSString(DataURI)
- (NSString *) pngDataURIWithContent;
- (NSString *) jpgDataURIWithContent;
#end
NSString+DataURI.m
#import "NSString+DataURI.h"
#implementation NSString(DataURI)
- (NSString *) pngDataURIWithContent;
{
NSString * result = [NSString stringWithFormat: #"data:image/png;base64,%#", self];
return result;
}
- (NSString *) jpgDataURIWithContent;
{
NSString * result = [NSString stringWithFormat: #"data:image/jpg;base64,%#", self];
return result;
}
#end
You could simply add this line
webView.backgroundColor=[UIColor colorWithPatternImage:[UIImage imageNamed:#"light.jpg"]];
i am Getting the image from the .net web server which is in base64 encoded from.
By googling i found this source for the encryption and decryption
i tried this
#import <Foundation/Foundation.h>
#class NSString;
#interface NSData (NSDataAdditions)
+ (NSData *) base64DataFromString:(NSString *)string;
-------------------------------------------
#import "NSDataAdditions.h"
#implementation NSData (NSDataAdditions)
+ (NSData *) base64DataFromString: (NSString *)string {
unsigned long ixtext, lentext;
unsigned char ch, input[4], output[3];
short i, ixinput;
Boolean flignore, flendtext = false;
const char *temporary;
NSMutableData *result;
if (!string)
return [NSData data];
ixtext = 0;
temporary = [string UTF8String];
lentext = [string length];
result = [NSMutableData dataWithCapacity: lentext];
ixinput = 0;
while (true) {
if (ixtext >= lentext)
break;
ch = temporary[ixtext++];
flignore = false;
if ((ch >= 'A') && (ch <= 'Z'))
ch = ch - 'A';
else if ((ch >= 'a') && (ch <= 'z'))
ch = ch - 'a' + 26;
else if ((ch >= '0') && (ch <= '9'))
ch = ch - '0' + 52;
else if (ch == '+')
ch = 62;
else if (ch == '=')
flendtext = true;
else if (ch == '/')
ch = 63;
else
flignore = true;
if (!flignore) {
short ctcharsinput = 3;
Boolean flbreak = false;
if (flendtext) {
if (ixinput == 0)
break;
if ((ixinput == 1) || (ixinput == 2)) {
ctcharsinput = 1;
else
ctcharsinput = 2;
ixinput = 3;
flbreak = true;
}
input[ixinput++] = ch;
if (ixinput == 4)
ixinput = 0;
output[0] = (input[0] << 2) | ((input[1] & 0x30) >> 4);
output[1] = ((input[1] & 0x0F) << 4) | ((input[2] & 0x3C) >> 2);
output[2] = ((input[2] & 0x03) << 6) | (input[3] & 0x3F);
for (i = 0; i < ctcharsinput; i++)
[result appendBytes: &output[i] length: 1];
}
if (flbreak)
break;
}
return result;
}
#end
but it shows error by resolving errors it is not decrypted.
And i try this link
But i did n't understand through that link.
can any one pls help me.
Post some code for base64 decryption in iphone.
Thank u in advance.
You should use a Base64 teststring like VGVzdHN0cmluZw== to test this method.
Use http://www.motobit.com/util/base64-decoder-encoder.asp to debug your data.
Edit
You should convert your string online to TEST it in your Objective C Code! You cleary didn't pass the method a real Base64 encoded string.