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cathandnya/NSData+GIF.m

Last active December 27, 2015 06:08
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GIFかどうかを判断
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NSData+GIF.m
#import "NSData+GIF.h"
@implementation NSData(GIF)
- (BOOL) isGIF {
char *bytes = (char *)[self bytes];
return [self length] >= 6 && (strncmp(bytes, "GIF87a", 6) == 0 || strncmp(bytes, "GIF89a", 6) == 0);
}
@end
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