import gettext 
APP="SVGpage"  
DIR="./locale"
gettext.textdomain(APP)  
gettext.bindtextdomain(APP, DIR)
_ = gettext.gettext

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

tests.append(test_gif)

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)

def test_xpm(h, f):
    if h[3:6] == "XPM":
        return 'xpm'

tests.append(test_xpm)
#--------------------#
# 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 ***')