import os,sys,time,mmap,zlib

PAGESIZE = 4096
SIZES = ((2**32) + PAGESIZE + 4, 0)

FILE = 'py-mmap-testfile'

print('Start:', time.gmtime())
for i in SIZES:
    if i == 0:
        break
    print('Testing file size ', str(i), ': ', sep='', end='')
    sys.stdout.flush()
    with open(FILE, "wb+") as f:
        f.seek(i-4)
        f.write(b'abcd')
        f.flush()
        sb = os.stat(FILE) 
        if sb.st_size != i:
            print('size failure:', sb.st_size, ' != ', i, sep='', end='')
            sys.stdout.flush()
        mem = mmap.mmap(f.fileno(), 0, access=mmap.ACCESS_READ)
        if mem[0] != ord('\0'):
            print('offset 0 failed: ', ord(mem[0]), ' ', end='', sep='')
        else:
            print('offset 0 ok ', end='', sep='')
        sys.stdout.flush()
        if mem[i-4] != ord('a'):
            print('offset i-4 failed: ', ord(mem[i-4]), ' ', end='', sep='')
        else:
            print('offset i-4 ok ', end='', sep='')
        print('[ALL IN ORDER] ', sep='', end='')
        sys.stdout.flush()
        for j in range(0, sb.st_size):
            y = mem[j]
        print('ok')
        sys.stdout.flush()
    os.unlink(FILE)
print('End:', time.gmtime())