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#import "OFChecksumFailedException.h"
#import "OFInvalidArgumentException.h"
#import "OFInvalidFormatException.h"
#import "OFNotImplementedException.h"
#import "OFOpenFileFailedException.h"
#import "OFOutOfRangeException.h"
#import "OFReadFailedException.h"
#import "OFSeekFailedException.h"
#import "OFUnsupportedVersionException.h"
#import "autorelease.h"
#import "macros.h"
#define CRC32_MAGIC 0xEDB88320
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{
void *pool = objc_autoreleasePoolPush();
uint16_t commentLength;
off_t offset = -22;
bool valid = false;
do {
@try {
[_file seekToOffset: offset
whence: SEEK_END];
[_file seekToOffset: offset
whence: SEEK_END];
} @catch (OFSeekFailedException *e) {
if ([e errNo] == EINVAL)
@throw [OFInvalidFormatException exception];
@throw e;
}
if ([_file readLittleEndianInt32] == 0x06054B50) {
valid = true;
break;
}
} while (--offset >= -65557);
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