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/*
* XADStringCFString.m
*
* Copyright (c) 2017-present, MacPaw Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301 USA
*/
#import "XADString.h"
@implementation XADString (PlatformSpecific)
+(NSString *)encodingNameForEncoding:(NSStringEncoding)encoding
{
// Internal kludge: Don't actually return an NSString. Instead,
// return an NSNumber containing the encoding number, that can
// be quickly unpacked later. This should be safe, as the object
// will not actually be touched by any other function than the
// ones in XADStringCFString.
return (NSString *)[NSNumber numberWithLong:encoding];
}
+(NSStringEncoding)encodingForEncodingName:(NSString *)encoding
{
if([encoding isKindOfClass:[NSNumber class]])
{
// If the encodingname is actually an NSNumber, just unpack it and convert.
return [(NSNumber *)encoding longValue];
}
else
{
// Look up the encoding number for the name.
return CFStringConvertEncodingToNSStringEncoding(
CFStringConvertIANACharSetNameToEncoding((CFStringRef)encoding));
}
}
+(CFStringEncoding)CFStringEncodingForEncodingName:(NSString *)encodingname
{
return CFStringConvertNSStringEncodingToEncoding([self encodingForEncodingName:encodingname]);
}
+(BOOL)canDecodeData:(NSData *)data encodingName:(NSString *)encoding
{
return [self canDecodeBytes:[data bytes] length:[data length] encodingName:encoding];
}
+(BOOL)canDecodeBytes:(const void *)bytes length:(size_t)length encodingName:(NSString *)encoding
{
CFStringEncoding cfenc=[XADString CFStringEncodingForEncodingName:encoding];
if(cfenc==kCFStringEncodingInvalidId) return NO;
CFStringRef str=CFStringCreateWithBytes(kCFAllocatorDefault,bytes,length,cfenc,false);
if(str) { CFRelease(str); return YES; }
else return NO;
}
+(NSString *)stringForData:(NSData *)data encodingName:(NSString *)encoding
{
return [self stringForBytes:[data bytes] length:[data length] encodingName:encoding];
}
+(NSString *)stringForBytes:(const void *)bytes length:(size_t)length encodingName:(NSString *)encoding
{
CFStringEncoding cfenc=[XADString CFStringEncodingForEncodingName:encoding];
if(cfenc==kCFStringEncodingInvalidId) return nil;
CFStringRef str=CFStringCreateWithBytes(kCFAllocatorDefault,bytes,length,cfenc,false);
return [(id)str autorelease];
}
+(NSData *)dataForString:(NSString *)string encodingName:(NSString *)encoding
{
NSInteger numchars=[string length];
CFIndex numbytes;
if(CFStringGetBytes((CFStringRef)string,CFRangeMake(0,numchars),
[self CFStringEncodingForEncodingName:encoding],0,false,
NULL,0,&numbytes)!=numchars) return nil;
uint8_t *bytes=malloc(numbytes);
CFStringGetBytes((CFStringRef)string,CFRangeMake(0,numchars),
[self CFStringEncodingForEncodingName:encoding],0,false,
bytes,numbytes,NULL);
return [NSData dataWithBytesNoCopy:bytes length:numbytes freeWhenDone:YES];
}
+(NSArray *)availableEncodingNames
{
NSMutableArray *array=[NSMutableArray array];
const CFStringEncoding *encodings=CFStringGetListOfAvailableEncodings();
while(*encodings!=kCFStringEncodingInvalidId)
{
NSString *name=(NSString *)CFStringConvertEncodingToIANACharSetName(*encodings);
NSString *description=[NSString localizedNameOfStringEncoding:CFStringConvertEncodingToNSStringEncoding(*encodings)];
if(name)
{
[array addObject:[NSArray arrayWithObjects:description,name,nil]];
}
encodings++;
}
return array;
}
@end
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