DouKaku?

#import <Foundation/Foundation.h>

#define FilePath @"fixedlengthdata.txt"
const unsigned int RecordSize = 12 + 12 + 1 + 3 + 4 + 2 + 31 * 1502;
const unsigned int RecordCount = 500;

int main (int argc, const char * argv[]) {
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
    
    NSData* data = [NSData dataWithContentsOfMappedFile:FilePath];
    if ( data ) {
        NSMutableArray* array = [NSMutableArray array];
        for ( int i = 0; i < RecordCount; i++ )
            [array addObject:[data subdataWithRange:NSMakeRange( i * RecordSize, RecordSize )]];
    }
    
    [pool drain];
    return 0;
}