Mercurial > hgrepos > Python > apps > py-cutils

comparison shasum.py @ 58:ae5b31c10b41

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Enhance comments
author Franz Glasner <fzglas.hg@dom66.de>
date Tue, 08 Feb 2022 20:31:25 +0100
parents 0fa2067bedb8
children b96d3585e8ce
comparison
equal deleted inserted replaced
57:0fa2067bedb8 58:ae5b31c10b41
468 pass 468 pass
469 fd = os.open(filename, flags) 469 fd = os.open(filename, flags)
470 try: 470 try:
471 st = os.fstat(fd) 471 st = os.fstat(fd)
472 filesize = st[stat.ST_SIZE] 472 filesize = st[stat.ST_SIZE]
473 #
474 # On Windows mmapped file with length 0 are not supported
475 # -> use low-level IO
476 #
477 if mmap is None: 473 if mmap is None:
474 # No mmmap available -> use traditional low-level file IO
478 while True: 475 while True:
479 buf = os.read(fd, CHUNK_SIZE) 476 buf = os.read(fd, CHUNK_SIZE)
480 if len(buf) == 0: 477 if len(buf) == 0:
481 break 478 break
482 h.update(buf) 479 h.update(buf)
483 else: 480 else:
484 # mmap 481 #
482 # Use mmap
483 #
484 # NOTE: On Windows mmapped files with length 0 are not supported.
485 # So ensure to not call mmap.mmap() if the file size is 0.
486 #
485 if filesize < MAP_CHUNK_SIZE: 487 if filesize < MAP_CHUNK_SIZE:
486 mapsize = filesize 488 mapsize = filesize
487 else: 489 else:
488 mapsize = MAP_CHUNK_SIZE 490 mapsize = MAP_CHUNK_SIZE
489 mapoffset = 0 491 mapoffset = 0