iphone-common-codes-ccteam源代码 CCEncoding.m（编码转换）

//
//  CCEncoding.m
//  CCFC
//
//  Created by xichen on 11-12-18.
//  Copyright 2011 ccteam. All rights reserved.
//


#import "CCEncoding.h"




@implementation CCEncoding


// log all encodings
+ (void)logAllEncodings
{
const NSStringEncoding *encodings = [NSString availableStringEncodings];
        NSMutableString *str = [[NSMutableString alloc] init];
        NSStringEncoding encoding;

while ((encoding = *encodings++) != 0)
        {
                [str appendFormat:@"%@ is %x\n", [NSString localizedNameOfStringEncoding:encoding], encoding];
        }
        NSLog(@"str is %@", str);
        [str release];

        NSLog(@"defaultCStringEncoding is %d", [NSString defaultCStringEncoding]);
}


// unicode                      --->                    UTF8
+ (const char *)UnicodeToUTF8:(NSString *)src
{
return [src UTF8String]; 
}


// UTF8                         --->                    unicode
+ (NSString *)UTF8ToUnicode:(const char *)src
{
return [NSString stringWithCString:src encoding:NSUTF8StringEncoding];
}




// GB18030                      --->                    unicode
+ (NSString *)GB18030ToUnicode:(const char *)src
{
        NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);
return [NSString stringWithCString:src encoding:enc];
}


// unicode                      --->                    GB18030
+ (const char *)UnicodeToGB18030:(NSString *)src
{
        NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);
return [src cStringUsingEncoding:enc]; 
}


// GB18030                      --->                    UTF8
// GB18030      --> Unicode             -->             UTF8
+ (const char *)GB18030ToUTF8:(const char *)src
{
        NSString *unicode = [self GB18030ToUnicode:src];
return [self UnicodeToUTF8:unicode];
}


// UTF8                         --->                    GB18030
// UTF8         -->     Unicode         -->             GB18030
+ (const char *)UTF8ToGB18030:(const char *)src
{
        NSString *unicode = [self UTF8ToUnicode:src];
return [self UnicodeToGB18030:unicode];
}


// Unicode cStr  to Unicode NSString 
// you should make sure the cStr begins with 0xFF, 0xFE(the unicode flag).
+ (NSString *)UnicodeCStrToUnicode:(const char *)cStr withLen:(int)len
{
        NSData *data = [NSData dataWithBytes:cStr length:len];
return [[[NSString alloc] initWithData:data encoding:NSUnicodeStringEncoding] autorelease];
}




@end