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TiHTTPHelper.m
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TiHTTPHelper.m
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/**
* Appcelerator Titanium Mobile
* Copyright (c) 2009-2014 by Appcelerator, Inc. All Rights Reserved.
* Licensed under the terms of the Apache Public License
* Please see the LICENSE included with this distribution for details.
*
* Special thanks to Pedro Enrique for implementing this.
*/
#import "TiHTTPClient.h"
#import <MobileCoreServices/MobileCoreServices.h>
@implementation TiHTTPHelper
static char *alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+(NSString *)base64encode:(NSData *)plainText
{
int encodedLength = (4 * (([plainText length] / 3) + (1 - (3 - ([plainText length] % 3)) / 3))) + 1;
unsigned char *outputBuffer = malloc(encodedLength);
unsigned char *inputBuffer = (unsigned char *)[plainText bytes];
NSInteger i;
NSInteger j = 0;
int remain;
for(i = 0; i < [plainText length]; i += 3) {
remain = [plainText length] - i;
outputBuffer[j++] = alphabet[(inputBuffer[i] & 0xFC) >> 2];
outputBuffer[j++] = alphabet[((inputBuffer[i] & 0x03) << 4) |
((remain > 1) ? ((inputBuffer[i + 1] & 0xF0) >> 4): 0)];
if(remain > 1)
outputBuffer[j++] = alphabet[((inputBuffer[i + 1] & 0x0F) << 2)
| ((remain > 2) ? ((inputBuffer[i + 2] & 0xC0) >> 6) : 0)];
else
outputBuffer[j++] = '=';
if(remain > 2)
outputBuffer[j++] = alphabet[inputBuffer[i + 2] & 0x3F];
else
outputBuffer[j++] = '=';
}
outputBuffer[j] = 0;
NSString *result = [NSString stringWithUTF8String:(const char*)outputBuffer];
free(outputBuffer);
return result;
}
+(int)caselessCompareFirstString:(const char *)firstString secondString:(const char *)secondString size:(int)size
{
int index = 0;
while(index < size)
{
char firstChar = tolower(firstString[index]);
char secondChar = secondString[index]; //Second string is always lowercase.
index++;
if(firstChar!=secondChar)return index; //Yes, this is one after the failure.
}
return 0;
}
#define TRYENCODING( encodingName, nameSize, returnValue, value ) \
if((remainingSize > nameSize)&&([self caselessCompareFirstString:data secondString:encodingName size:nameSize] == 0)) {*value = returnValue; return YES;}
+(BOOL)extractEncodingFromData:(NSData *)inputData result:(NSStringEncoding*)result
{
int remainingSize = [inputData length];
int unsearchableSize;
if(remainingSize > 2008) unsearchableSize = remainingSize - 2000;
else unsearchableSize = 8; // So that there's no chance of overrunning the buffer with 'charset='
const char * data = [inputData bytes];
// XML provides its own encoding format as part of the definition,
// we need to use this if it looks like a XML document
int prefix = [self caselessCompareFirstString:data secondString:"<?xml" size:5];
if (prefix==0)
{
char *enc = strstr(data, "encoding=");
if (enc)
{
enc += 10;
data = enc;
TRYENCODING("windows-1252",12,NSWindowsCP1252StringEncoding,result);
TRYENCODING("iso-8859-1",10,NSISOLatin1StringEncoding,result);
TRYENCODING("utf-8",5,NSUTF8StringEncoding,result);
TRYENCODING("shift-jis",9,NSShiftJISStringEncoding,result);
TRYENCODING("shift_jis",9,NSShiftJISStringEncoding,result);
TRYENCODING("x-euc",5,NSJapaneseEUCStringEncoding,result);
TRYENCODING("euc-jp",6,NSJapaneseEUCStringEncoding,result);
TRYENCODING("windows-1250",12,NSWindowsCP1251StringEncoding,result);
TRYENCODING("windows-1251",12,NSWindowsCP1252StringEncoding,result);
TRYENCODING("windows-1253",12,NSWindowsCP1253StringEncoding,result);
TRYENCODING("windows-1254",12,NSWindowsCP1254StringEncoding,result);
TRYENCODING("windows-1255",12,CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingWindowsHebrew),result);
return NO;
}
}
while(remainingSize > unsearchableSize)
{
int compareOffset = [self caselessCompareFirstString:data secondString:"charset=" size:8];
if (compareOffset != 0)
{
data += compareOffset;
remainingSize -= compareOffset;
continue;
}
data += 8;
remainingSize -= 8;
TRYENCODING("windows-1252",12,NSWindowsCP1252StringEncoding,result);
TRYENCODING("iso-8859-1",10,NSISOLatin1StringEncoding,result);
TRYENCODING("utf-8",5,NSUTF8StringEncoding,result);
TRYENCODING("shift-jis",9,NSShiftJISStringEncoding,result);
TRYENCODING("shift_jis",9,NSShiftJISStringEncoding,result);
TRYENCODING("x-euc",5,NSJapaneseEUCStringEncoding,result);
TRYENCODING("euc-jp",6,NSJapaneseEUCStringEncoding,result);
TRYENCODING("windows-1250",12,NSWindowsCP1251StringEncoding,result);
TRYENCODING("windows-1251",12,NSWindowsCP1252StringEncoding,result);
TRYENCODING("windows-1253",12,NSWindowsCP1253StringEncoding,result);
TRYENCODING("windows-1254",12,NSWindowsCP1254StringEncoding,result);
TRYENCODING("windows-1255",12,CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingWindowsHebrew),result);
}
return NO;
}
// Taken from http://stackoverflow.com/questions/4147311/finding-image-type-from-nsdata-or-uiimage
+ (NSString *)contentTypeForImageData:(NSData *)data {
uint8_t c;
[data getBytes:&c length:1];
switch (c) {
case 0xFF:
return @"image/jpeg";
case 0x89:
return @"image/png";
case 0x47:
return @"image/gif";
case 0x49:
case 0x4D:
return @"image/tiff";
}
return @"application/octet-stream";
}
// Taken from http://stackoverflow.com/questions/2439020/wheres-the-iphone-mime-type-database
+ (NSString*)fileMIMEType:(NSString*) file
{
CFStringRef UTI = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, (__bridge CFStringRef)[file pathExtension], NULL);
CFStringRef MIMEType = UTTypeCopyPreferredTagWithClass (UTI, kUTTagClassMIMEType);
CFRelease(UTI);
if (!MIMEType) {
return @"application/octet-stream";
}
return (__bridge NSString *)MIMEType;
}
// Taken from http://stackoverflow.com/questions/8088473/url-encode-an-nsstring
+ (NSString*)encodeURL:(NSString *)string
{
NSMutableString *output = [NSMutableString string];
const unsigned char *source = (const unsigned char *)[string UTF8String];
int sourceLen = strlen((const char *)source);
for (int i = 0; i < sourceLen; ++i) {
const unsigned char thisChar = source[i];
if (thisChar == ' '){
[output appendString:@"+"];
} else if (thisChar == '.' || thisChar == '-' || thisChar == '_' || thisChar == '~' ||
(thisChar >= 'a' && thisChar <= 'z') ||
(thisChar >= 'A' && thisChar <= 'Z') ||
(thisChar >= '0' && thisChar <= '9')) {
[output appendFormat:@"%c", thisChar];
} else {
[output appendFormat:@"%%%02X", thisChar];
}
}
return output;
}
+ (void)parseMimeType:(NSString **)mimeType andResponseEncoding:(NSStringEncoding *)stringEncoding fromContentType:(NSString *)contentType
{
if (!contentType) {
return;
}
NSScanner *charsetScanner = [NSScanner scannerWithString: contentType];
if (![charsetScanner scanUpToString:@";" intoString:mimeType] || [charsetScanner scanLocation] == [contentType length]) {
*mimeType = [contentType stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
return;
}
*mimeType = [*mimeType stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
NSString *charsetSeparator = @"charset=";
NSString *IANAEncoding = nil;
if ([charsetScanner scanUpToString: charsetSeparator intoString: NULL] && [charsetScanner scanLocation] < [contentType length]) {
[charsetScanner setScanLocation: [charsetScanner scanLocation] + [charsetSeparator length]];
[charsetScanner scanUpToString: @";" intoString: &IANAEncoding];
}
if (IANAEncoding) {
CFStringEncoding cfEncoding = CFStringConvertIANACharSetNameToEncoding((CFStringRef)IANAEncoding);
if (cfEncoding != kCFStringEncodingInvalidId) {
*stringEncoding = CFStringConvertEncodingToNSStringEncoding(cfEncoding);
}
}
}
+(NSStringEncoding)parseStringEncodingFromHeaders:(NSDictionary*)headers
{
// Handle response text encoding
NSStringEncoding charset = 0;
NSString *mimeType = nil;
[self parseMimeType:&mimeType andResponseEncoding:&charset fromContentType:[headers valueForKey:@"Content-Type"]];
return charset;
}
@end