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@mmackh
Last active January 19, 2017 23:12
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Personal NSString Additions
//
// NSString+Hash.h
// Orbitink
//
// Created by mmackh on 5/3/13.
// Copyright (c) 2013 Professional Consulting & Trading GmbH. All rights reserved.
//
#import <Foundation/Foundation.h>
@interface NSString (Additions)
- (NSString *)urlFriendlyFileNameWithExtension:(NSString *)extension prefixID:(int)prefixID;
- (NSString *)urlFriendlyFileName;
- (NSString *)stringByAppendingURLPathComponent:(NSString *)pathComponent;
- (NSString *)stringByDeletingLastURLPathComponent;
- (NSString *)sha512;
- (NSString *)base64Encode;
- (NSString *)base64Decode;
- (NSString*)stringBetweenString:(NSString *)start andString:(NSString *)end;
- (NSString *)stringByStrippingHTML;
- (NSString *)localCachePath;
- (NSString *)trim;
- (BOOL)isNumeric;
- (BOOL)containsString:(NSString *)needle;
+ (NSString *)stringWithInteger:(NSUInteger)integer;
//PHP functions I really like
__attribute__((overloadable))
NSString *substr(NSString *str, int start);
__attribute__((overloadable))
NSString *substr(NSString *str, int start, int length);
NSString *str_replace(NSString *search, NSString *replace, NSString *subject);
@end
@interface NSObject (isEmpty)
- (BOOL)mag_isEmpty;
@end
//
// NSString+Hash.m
// Orbitink
//
// Created by mmackh on 5/3/13.
// Copyright (c) 2013 Professional Consulting & Trading GmbH. All rights reserved.
//
#import "NSString+Additions.h"
#import <CommonCrypto/CommonDigest.h>
static const char _base64EncodingTable[64] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
static const short _base64DecodingTable[256] = {
-2, -2, -2, -2, -2, -2, -2, -2, -2, -1, -1, -2, -1, -1, -2, -2,
-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
-1, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, 62, -2, -2, -2, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -2, -2, -2, -2, -2, -2,
-2, 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, -2, -2, -2, -2, -2,
-2, 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, -2, -2, -2, -2, -2,
-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2,
-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2
};
@implementation NSString (Additions)
- (NSString *)urlFriendlyFileNameWithExtension:(NSString *)extension prefixID:(int)prefixID
{
if (self.length == 0) return @"";
NSString *umlaut = [self stringByReplacingOccurrencesOfString:@"ß" withString:@"ss"];
umlaut = [umlaut stringByReplacingOccurrencesOfString:@"ä" withString:@"ae"];
umlaut = [umlaut stringByReplacingOccurrencesOfString:@"ö" withString:@"oe"];
umlaut = [umlaut stringByReplacingOccurrencesOfString:@"ü" withString:@"ue"];
umlaut = [umlaut stringByReplacingOccurrencesOfString:@"Ä" withString:@"Ae"];
umlaut = [umlaut stringByReplacingOccurrencesOfString:@"Ö" withString:@"Oe"];
umlaut = [umlaut stringByReplacingOccurrencesOfString:@"Ü" withString:@"Ue"];
NSMutableCharacterSet *charactersToRemove = [[[ NSCharacterSet alphanumericCharacterSet ] invertedSet ] mutableCopy];
[charactersToRemove removeCharactersInString:@"-+"];
NSString *cleanTitle = [[umlaut componentsSeparatedByCharactersInSet:charactersToRemove] componentsJoinedByString:@"_"];
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"__+" options:NSRegularExpressionCaseInsensitive error:nil];
cleanTitle = [regex stringByReplacingMatchesInString:cleanTitle options:0 range:NSMakeRange(0, [cleanTitle length]) withTemplate:@"_"];
if ([[cleanTitle substringWithRange:NSMakeRange([cleanTitle length]-1, 1)] isEqualToString:@"_"])
{
cleanTitle = [cleanTitle substringWithRange:NSMakeRange(0, [cleanTitle length]-1)];
}
if (!prefixID)
{
return [cleanTitle stringByAppendingPathExtension:extension];
}
return [[[NSString stringWithFormat:@"%i-%@",prefixID, cleanTitle] lowercaseString] stringByAppendingPathExtension:extension];
}
- (NSString *)urlFriendlyFileName
{
NSString *fileExtension = [self pathExtension];
return [[self stringByReplacingOccurrencesOfString:fileExtension withString:@""] urlFriendlyFileNameWithExtension:fileExtension prefixID:0];
}
- (NSString *)stringByAppendingURLPathComponent:(NSString *)pathComponent
{
NSString *protocol = ([self hasPrefix:@"https://"]) ? @"https://" : @"http://";
NSString *cleanedStr = [self stringByReplacingOccurrencesOfString:protocol withString:@""];
return [NSString stringWithFormat:@"%@%@",protocol, [cleanedStr stringByAppendingPathComponent:pathComponent]];
}
- (NSString *)stringByDeletingLastURLPathComponent
{
NSString *protocol = ([self hasPrefix:@"https://"]) ? @"https://" : @"http://";
NSString *cleanedStr = [self stringByReplacingOccurrencesOfString:protocol withString:@""];
return [NSString stringWithFormat:@"%@%@",protocol, [cleanedStr stringByDeletingLastPathComponent]];
}
- (NSString *)sha512
{
const char *cstr = [self cStringUsingEncoding:NSUTF8StringEncoding];
NSData *data = [NSData dataWithBytes:cstr length:self.length];
uint8_t digest[CC_SHA256_DIGEST_LENGTH];
CC_SHA256(data.bytes, (int)data.length, digest);
NSMutableString* output = [NSMutableString stringWithCapacity:CC_SHA256_DIGEST_LENGTH * 2];
for(int i = 0; i < CC_SHA256_DIGEST_LENGTH; i++)
{
[output appendFormat:@"%02x", digest[i]];
}
return output;
}
- (NSString *)base64Encode
{
NSData *objData = [self dataUsingEncoding:NSUTF8StringEncoding];
const unsigned char * objRawData = [objData bytes];
char * objPointer;
char * strResult;
// Get the Raw Data length and ensure we actually have data
int intLength = (int)[objData length];
if (intLength == 0) return nil;
// Setup the String-based Result placeholder and pointer within that placeholder
strResult = (char *)calloc((((intLength + 2) / 3) * 4) + 1, sizeof(char));
objPointer = strResult;
// Iterate through everything
while (intLength > 2) { // keep going until we have less than 24 bits
*objPointer++ = _base64EncodingTable[objRawData[0] >> 2];
*objPointer++ = _base64EncodingTable[((objRawData[0] & 0x03) << 4) + (objRawData[1] >> 4)];
*objPointer++ = _base64EncodingTable[((objRawData[1] & 0x0f) << 2) + (objRawData[2] >> 6)];
*objPointer++ = _base64EncodingTable[objRawData[2] & 0x3f];
// we just handled 3 octets (24 bits) of data
objRawData += 3;
intLength -= 3;
}
// now deal with the tail end of things
if (intLength != 0) {
*objPointer++ = _base64EncodingTable[objRawData[0] >> 2];
if (intLength > 1) {
*objPointer++ = _base64EncodingTable[((objRawData[0] & 0x03) << 4) + (objRawData[1] >> 4)];
*objPointer++ = _base64EncodingTable[(objRawData[1] & 0x0f) << 2];
*objPointer++ = '=';
} else {
*objPointer++ = _base64EncodingTable[(objRawData[0] & 0x03) << 4];
*objPointer++ = '=';
*objPointer++ = '=';
}
}
// Terminate the string-based result
*objPointer = '\0';
// Create result NSString object
NSString *base64String = [NSString stringWithCString:strResult encoding:NSASCIIStringEncoding];
// Free memory
free(strResult);
return base64String;
}
- (NSString *)base64Decode
{
const char *objPointer = [self cStringUsingEncoding:NSASCIIStringEncoding];
size_t intLength = strlen(objPointer);
int intCurrent;
int i = 0, j = 0, k;
unsigned char *objResult = calloc(intLength, sizeof(unsigned char));
// Run through the whole string, converting as we go
while ( ((intCurrent = *objPointer++) != '\0') && (intLength-- > 0) ) {
if (intCurrent == '=') {
if (*objPointer != '=' && ((i % 4) == 1)) {// || (intLength > 0)) {
// the padding character is invalid at this point -- so this entire string is invalid
free(objResult);
return nil;
}
continue;
}
intCurrent = _base64DecodingTable[intCurrent];
if (intCurrent == -1) {
// we're at a whitespace -- simply skip over
continue;
} else if (intCurrent == -2) {
// we're at an invalid character
free(objResult);
return nil;
}
switch (i % 4) {
case 0:
objResult[j] = intCurrent << 2;
break;
case 1:
objResult[j++] |= intCurrent >> 4;
objResult[j] = (intCurrent & 0x0f) << 4;
break;
case 2:
objResult[j++] |= intCurrent >>2;
objResult[j] = (intCurrent & 0x03) << 6;
break;
case 3:
objResult[j++] |= intCurrent;
break;
}
i++;
}
k = j;
if (intCurrent == '=') {
switch (i % 4) {
case 1:
// Invalid state
free(objResult);
return nil;
case 2:
k++;
// flow through
case 3:
objResult[k] = 0;
}
}
// Cleanup and setup the return NSData
NSData * objData = [[NSData alloc] initWithBytes:objResult length:j];
free(objResult);
return [[NSString alloc] initWithData:objData encoding:NSUTF8StringEncoding];
}
- (NSString*)stringBetweenString:(NSString *)start andString:(NSString *)end {
NSRange startRange = [self rangeOfString:start];
if (startRange.location != NSNotFound) {
NSRange targetRange;
targetRange.location = startRange.location + startRange.length;
targetRange.length = [self length] - targetRange.location;
NSRange endRange = [self rangeOfString:end options:0 range:targetRange];
if (endRange.location != NSNotFound) {
targetRange.length = endRange.location - targetRange.location;
return [self substringWithRange:targetRange];
}
}
return nil;
}
- (NSString *)stringByStrippingHTML
{
NSRange r;
NSString *s = [self copy];
while ((r = [s rangeOfString:@"<[^>]+>" options:NSRegularExpressionSearch]).location != NSNotFound)
s = [s stringByReplacingCharactersInRange:r withString:@""];
return s;
}
- (NSString *)localCachePath
{
NSString *filename = [self sha512];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
return [NSString stringWithFormat:@"%@/%@.%@",[paths objectAtIndex:0],filename,self.pathExtension];
}
- (NSString *)trim
{
return [self stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
}
- (BOOL)isNumeric
{
NSScanner* scan = [NSScanner scannerWithString:self];
int val;
return [scan scanInt:&val] && [scan isAtEnd];
}
- (BOOL)containsString:(NSString *)needle
{
if (!self.length) return NO;
return ([self rangeOfString:needle].location == NSNotFound) ? NO : YES;
}
+ (NSString *)stringWithInteger:(NSUInteger)integer
{
return [NSString stringWithFormat:@"%li",(unsigned long)integer];
}
__attribute__((overloadable))
NSString *substr(NSString *str, int start)
{
return substr(str, start, 0);
}
__attribute__((overloadable))
NSString *substr(NSString *str, int start, int length)
{
NSInteger str_len = str.length;
if (!str_len) return @"";
if (str_len < length) return str;
if (start < 0 && length == 0)
{
return [str substringFromIndex:str_len+start];
}
if (start == 0 && length > 0)
{
return [str substringToIndex:length];
}
if (start < 0 && length > 0)
{
return [[str substringFromIndex:str_len+start] substringToIndex:length];
}
if (start > 0 && length > 0)
{
return [[str substringFromIndex:start] substringToIndex:length];
}
if (start > 0 && length == 0)
{
return [str substringFromIndex:start];
}
if (length < 0)
{
NSString *tmp_str;
if (start < 0)
{
tmp_str = [str substringFromIndex:str_len+start];
}
else
{
tmp_str = [str substringFromIndex:start];
}
NSInteger tmp_str_len = tmp_str.length;
if (tmp_str_len + length <= 0) return @"";
return [tmp_str substringToIndex:tmp_str_len+length];
}
return str;
}
NSString *str_replace(NSString *search, NSString *replace, NSString *subject)
{
return [subject.copy stringByReplacingOccurrencesOfString:search withString:replace];
}
@end
@implementation NSObject (isEmpty)
- (BOOL)mag_isEmpty
{
return self == nil || ([self respondsToSelector:@selector(length)] && [(NSData *)self length] == 0) || ([self respondsToSelector:@selector(count)] && [(NSArray *)self count] == 0);
}
@end
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