add hg and python

sys/lib/python/imghdr.py

@@ -0,0 +1,161 @@
+"""Recognize image file formats based on their first few bytes."""
+
+__all__ = ["what"]
+
+#-------------------------#
+# Recognize image headers #
+#-------------------------#
+
+def what(file, h=None):
+    if h is None:
+        if type(file) == type(''):
+            f = open(file, 'rb')
+            h = f.read(32)
+        else:
+            location = file.tell()
+            h = file.read(32)
+            file.seek(location)
+            f = None
+    else:
+        f = None
+    try:
+        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_rgb(h, f):
+    """SGI image library"""
+    if h[:2] == '\001\332':
+        return 'rgb'
+
+tests.append(test_rgb)
+
+def test_gif(h, f):
+    """GIF ('87 and '89 variants)"""
+    if h[:6] in ('GIF87a', 'GIF89a'):
+        return 'gif'
+
+tests.append(test_gif)
+
+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_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_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_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_bmp(h, f):
+    if h[:2] == 'BM':
+        return 'bmp'
+
+tests.append(test_bmp)
+
+def test_png(h, f):
+    if h[:8] == "\211PNG\r\n\032\n":
+        return 'png'
+
+tests.append(test_png)
+
+#--------------------#
+# 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 ***'