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Code Editor : png.py
""" sphinx.util.png ~~~~~~~~~~~~~~~ PNG image manipulation helpers. :copyright: Copyright 2007-2021 by the Sphinx team, see AUTHORS. :license: BSD, see LICENSE for details. """ import binascii import struct from typing import Optional LEN_IEND = 12 LEN_DEPTH = 22 DEPTH_CHUNK_LEN = struct.pack('!i', 10) DEPTH_CHUNK_START = b'tEXtDepth\x00' IEND_CHUNK = b'\x00\x00\x00\x00IEND\xAE\x42\x60\x82' def read_png_depth(filename: str) -> Optional[int]: """Read the special tEXt chunk indicating the depth from a PNG file.""" with open(filename, 'rb') as f: f.seek(- (LEN_IEND + LEN_DEPTH), 2) depthchunk = f.read(LEN_DEPTH) if not depthchunk.startswith(DEPTH_CHUNK_LEN + DEPTH_CHUNK_START): # either not a PNG file or not containing the depth chunk return None else: return struct.unpack('!i', depthchunk[14:18])[0] def write_png_depth(filename: str, depth: int) -> None: """Write the special tEXt chunk indicating the depth to a PNG file. The chunk is placed immediately before the special IEND chunk. """ data = struct.pack('!i', depth) with open(filename, 'r+b') as f: # seek to the beginning of the IEND chunk f.seek(-LEN_IEND, 2) # overwrite it with the depth chunk f.write(DEPTH_CHUNK_LEN + DEPTH_CHUNK_START + data) # calculate the checksum over chunk name and data crc = binascii.crc32(DEPTH_CHUNK_START + data) & 0xffffffff f.write(struct.pack('!I', crc)) # replace the IEND chunk f.write(IEND_CHUNK)
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