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Octocat-spinner-32-eaf2f5

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#import "NSData+XMPP.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


@implementation NSData (XMPP)

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','+','/' };


- (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 long)dataBuffer[i]];
}
    
    return [stringBuffer copy];
}

- (NSString *)base64Encoded
{
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;
}

return [NSString stringWithString:result];
}

- (NSData *)base64Decoded
{
const unsigned char *bytes = [self bytes];
NSMutableData *result = [NSMutableData dataWithCapacity:[self length]];

unsigned long ixtext = 0;
unsigned long lentext = [self length];
unsigned char ch = 0;
unsigned char inbuf[4], outbuf[3];
short i = 0, ixinbuf = 0;
BOOL flignore = NO;
BOOL flendtext = NO;

while( YES )
{
if( ixtext >= lentext ) break;
ch = bytes[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++ )
[result appendBytes:&outbuf[i] length:1];
}

if( flbreak ) break;
}
}

return [NSData dataWithData:result];
}

@end
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