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Edit File : imghdr.py \| Size : 3.45 KB
"""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, str): 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 or Exif format""" if h[6:10] in (b'JFIF', b'Exif'): return 'jpeg' tests.append(test_jpeg) def test_png(h, f): if h.startswith(b'\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 (b'GIF87a', b'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 (b'MM', b'II'): return 'tiff' tests.append(test_tiff) def test_rgb(h, f): """SGI image library""" if h.startswith(b'\001\332'): return 'rgb' tests.append(test_rgb) def test_pbm(h, f): """PBM (portable bitmap)""" if len(h) >= 3 and \ h[0] == ord(b'P') and h[1] in b'14' and h[2] in b' \t\n\r': return 'pbm' tests.append(test_pbm) def test_pgm(h, f): """PGM (portable graymap)""" if len(h) >= 3 and \ h[0] == ord(b'P') and h[1] in b'25' and h[2] in b' \t\n\r': return 'pgm' tests.append(test_pgm) def test_ppm(h, f): """PPM (portable pixmap)""" if len(h) >= 3 and \ h[0] == ord(b'P') and h[1] in b'36' and h[2] in b' \t\n\r': return 'ppm' tests.append(test_ppm) def test_rast(h, f): """Sun raster file""" if h.startswith(b'\x59\xA6\x6A\x95'): return 'rast' tests.append(test_rast) def test_xbm(h, f): """X bitmap (X10 or X11)""" if h.startswith(b'#define '): return 'xbm' tests.append(test_xbm) def test_bmp(h, f): if h.startswith(b'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 + '/:', end=' ') 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 + ':', end=' ') sys.stdout.flush() try: print(what(filename)) except IOError: print(' not found *') if __name__ == '__main__': test() Back

Edit File : imghdr.py | Size : 3.45 KB

"""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, str):
                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 or Exif format"""
    if h[6:10] in (b'JFIF', b'Exif'):
        return 'jpeg'

tests.append(test_jpeg)

def test_png(h, f):
    if h.startswith(b'\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 (b'GIF87a', b'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 (b'MM', b'II'):
        return 'tiff'

tests.append(test_tiff)

def test_rgb(h, f):
    """SGI image library"""
    if h.startswith(b'\001\332'):
        return 'rgb'

tests.append(test_rgb)

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

tests.append(test_pbm)

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

tests.append(test_pgm)

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

tests.append(test_ppm)

def test_rast(h, f):
    """Sun raster file"""
    if h.startswith(b'\x59\xA6\x6A\x95'):
        return 'rast'

tests.append(test_rast)

def test_xbm(h, f):
    """X bitmap (X10 or X11)"""
    if h.startswith(b'#define '):
        return 'xbm'

tests.append(test_xbm)

def test_bmp(h, f):
    if h.startswith(b'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 + '/:', end=' ')
            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 + ':', end=' ')
            sys.stdout.flush()
            try:
                print(what(filename))
            except IOError:
                print('*** not found ***')

if __name__ == '__main__':
    test()

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