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woff2otf
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‎scripts/woff2otf.py‎

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#!/opt/local/bin/python3.4
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#
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# Copyright 2012, Steffen Hanikel (https://github.com/hanikesn)
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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# A tool to convert a WOFF back to a TTF/OTF font file, in pure Python
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import struct
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import sys
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import zlib
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def convert_streams(infile, outfile):
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WOFFHeader = {'signature': struct.unpack(">I", infile.read(4))[0],
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'flavor': struct.unpack(">I", infile.read(4))[0],
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'length': struct.unpack(">I", infile.read(4))[0],
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'numTables': struct.unpack(">H", infile.read(2))[0],
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'reserved': struct.unpack(">H", infile.read(2))[0],
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'totalSfntSize': struct.unpack(">I", infile.read(4))[0],
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'majorVersion': struct.unpack(">H", infile.read(2))[0],
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'minorVersion': struct.unpack(">H", infile.read(2))[0],
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'metaOffset': struct.unpack(">I", infile.read(4))[0],
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'metaLength': struct.unpack(">I", infile.read(4))[0],
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'metaOrigLength': struct.unpack(">I", infile.read(4))[0],
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'privOffset': struct.unpack(">I", infile.read(4))[0],
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'privLength': struct.unpack(">I", infile.read(4))[0]}
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outfile.write(struct.pack(">I", WOFFHeader['flavor']));
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outfile.write(struct.pack(">H", WOFFHeader['numTables']));
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maximum = list(filter(lambda x: x[1] <= WOFFHeader['numTables'], [(n, 2**n) for n in range(64)]))[-1];
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searchRange = maximum[1] * 16
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outfile.write(struct.pack(">H", searchRange));
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entrySelector = maximum[0]
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outfile.write(struct.pack(">H", entrySelector));
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rangeShift = WOFFHeader['numTables'] * 16 - searchRange;
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outfile.write(struct.pack(">H", rangeShift));
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offset = outfile.tell()
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TableDirectoryEntries = []
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for i in range(0, WOFFHeader['numTables']):
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TableDirectoryEntries.append({'tag': struct.unpack(">I", infile.read(4))[0],
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'offset': struct.unpack(">I", infile.read(4))[0],
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'compLength': struct.unpack(">I", infile.read(4))[0],
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'origLength': struct.unpack(">I", infile.read(4))[0],
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'origChecksum': struct.unpack(">I", infile.read(4))[0]})
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offset += 4*4
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for TableDirectoryEntry in TableDirectoryEntries:
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outfile.write(struct.pack(">I", TableDirectoryEntry['tag']))
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outfile.write(struct.pack(">I", TableDirectoryEntry['origChecksum']))
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outfile.write(struct.pack(">I", offset))
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outfile.write(struct.pack(">I", TableDirectoryEntry['origLength']))
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TableDirectoryEntry['outOffset'] = offset
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offset += TableDirectoryEntry['origLength']
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if (offset % 4) != 0:
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offset += 4 - (offset % 4)
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for TableDirectoryEntry in TableDirectoryEntries:
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infile.seek(TableDirectoryEntry['offset'])
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compressedData = infile.read(TableDirectoryEntry['compLength'])
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if TableDirectoryEntry['compLength'] != TableDirectoryEntry['origLength']:
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uncompressedData = zlib.decompress(compressedData)
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else:
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uncompressedData = compressedData
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outfile.seek(TableDirectoryEntry['outOffset'])
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outfile.write(uncompressedData)
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offset = TableDirectoryEntry['outOffset'] + TableDirectoryEntry['origLength'];
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padding = 0
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if (offset % 4) != 0:
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padding = 4 - (offset % 4)
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outfile.write(bytearray(padding));
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def convert(infilename, outfilename):
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with open(infilename , mode='rb') as infile:
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with open(outfilename, mode='wb') as outfile:
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convert_streams(infile, outfile)
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def main(argv):
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if len(argv) == 1 or len(argv) > 3:
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print('I convert *.woff files to *.otf files. (one at a time :)\n'
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'Usage: woff2otf.py web_font.woff [converted_filename.otf]\n'
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'If the target file name is ommited, it will be guessed. Have fun!\n')
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return
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source_file_name = argv[1]
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if len(argv) == 3:
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target_file_name = argv[2]
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else:
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target_file_name = source_file_name.split('.')[0] + '.otf'
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convert(source_file_name, target_file_name)
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return 0
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if __name__ == '__main__':
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sys.exit(main(sys.argv))

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