/*

 File: FileBuffer.h

 Abstract: FileBuffer represents a simple wrapper around NSFileHandle,

 adding some buffering and byte swapping.  It is deliberately not

 thread-safe; instead, the application serializes it by assigning a

 single instance to a single-threaded NSOperationQueue.

 Version: 1.1

 Disclaimer: IMPORTANT:  This Apple software is supplied to you by 

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 Neither the name, trademarks, service marks or logos of Apple Inc. 

 may be used to endorse or promote products derived from the Apple

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 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

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 OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.

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 */ 

#import <Cocoa/Cocoa.h>

@interface FileBuffer : NSObject {

    NSFileHandle *fileHandle;

    unsigned long long fileLength;

    unsigned long long currentOffset;

    NSData *currentData;

}

- (id)initWithURL:(NSURL *)url error:(NSError **)error;

- (void)close;

- (unsigned long long)fileLength;

- (uint8_t)byteAtOffset:(unsigned long long)offset;

- (uint16_t)littleUnsignedShortAtOffset:(unsigned long long)offset;

- (uint32_t)littleUnsignedIntAtOffset:(unsigned long long)offset;

- (NSData *)dataAtOffset:(unsigned long long)offset length:(NSUInteger)length;

@end