晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/lib64/python2.7/imghdr.py
"""Recognize image file formats based on their first few bytes."""

__all__ = ["what"]

#-------------------------#
# Recognize image headers #
#-------------------------#

def what(file, h=None):
    f = None
    try:
        if h is None:
            if isinstance(file, basestring):
                f = open(file, 'rb')
                h = f.read(32)
            else:
                location = file.tell()
                h = file.read(32)
                file.seek(location)
        for tf in tests:
            res = tf(h, f)
            if res:
                return res
    finally:
        if f: f.close()
    return None


#---------------------------------#
# Subroutines per image file type #
#---------------------------------#

tests = []

def test_jpeg(h, f):
    """JPEG data in JFIF format"""
    if h[6:10] == 'JFIF':
        return 'jpeg'

tests.append(test_jpeg)

def test_exif(h, f):
    """JPEG data in Exif format"""
    if h[6:10] == 'Exif':
        return 'jpeg'

tests.append(test_exif)

def test_png(h, f):
    if h[:8] == "\211PNG\r\n\032\n":
        return 'png'

tests.append(test_png)

def test_gif(h, f):
    """GIF ('87 and '89 variants)"""
    if h[:6] in ('GIF87a', 'GIF89a'):
        return 'gif'

tests.append(test_gif)

def test_tiff(h, f):
    """TIFF (can be in Motorola or Intel byte order)"""
    if h[:2] in ('MM', 'II'):
        return 'tiff'

tests.append(test_tiff)

def test_rgb(h, f):
    """SGI image library"""
    if h[:2] == '\001\332':
        return 'rgb'

tests.append(test_rgb)

def test_pbm(h, f):
    """PBM (portable bitmap)"""
    if len(h) >= 3 and \
        h[0] == 'P' and h[1] in '14' and h[2] in ' \t\n\r':
        return 'pbm'

tests.append(test_pbm)

def test_pgm(h, f):
    """PGM (portable graymap)"""
    if len(h) >= 3 and \
        h[0] == 'P' and h[1] in '25' and h[2] in ' \t\n\r':
        return 'pgm'

tests.append(test_pgm)

def test_ppm(h, f):
    """PPM (portable pixmap)"""
    if len(h) >= 3 and \
        h[0] == 'P' and h[1] in '36' and h[2] in ' \t\n\r':
        return 'ppm'

tests.append(test_ppm)

def test_rast(h, f):
    """Sun raster file"""
    if h[:4] == '\x59\xA6\x6A\x95':
        return 'rast'

tests.append(test_rast)

def test_xbm(h, f):
    """X bitmap (X10 or X11)"""
    s = '#define '
    if h[:len(s)] == s:
        return 'xbm'

tests.append(test_xbm)

def test_bmp(h, f):
    if h[:2] == 'BM':
        return 'bmp'

tests.append(test_bmp)

#--------------------#
# Small test program #
#--------------------#

def test():
    import sys
    recursive = 0
    if sys.argv[1:] and sys.argv[1] == '-r':
        del sys.argv[1:2]
        recursive = 1
    try:
        if sys.argv[1:]:
            testall(sys.argv[1:], recursive, 1)
        else:
            testall(['.'], recursive, 1)
    except KeyboardInterrupt:
        sys.stderr.write('\n[Interrupted]\n')
        sys.exit(1)

def testall(list, recursive, toplevel):
    import sys
    import os
    for filename in list:
        if os.path.isdir(filename):
            print filename + '/:',
            if recursive or toplevel:
                print 'recursing down:'
                import glob
                names = glob.glob(os.path.join(filename, '*'))
                testall(names, recursive, 0)
            else:
                print '*** directory (use -r) ***'
        else:
            print filename + ':',
            sys.stdout.flush()
            try:
                print what(filename)
            except IOError:
                print '*** not found ***'

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