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Moved all comments logic into _ignore_comments()

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This commit is contained in:
Andrew Murray 2022-06-14 19:38:51 +10:00
parent 6eb6232f04
commit 1bac1cf6f5
1 changed files with 29 additions and 32 deletions
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61
src/PIL/PpmImagePlugin.py
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@ -156,24 +156,38 @@ class PpmPlainDecoder(ImageFile.PyDecoder):
return min(a, b) if a * b > 0 else max(a, b) # lowest nonnegative index (or -1)
def _ignore_comments(self, block):
"""
Delete comments from block.
If comment does not end in this block, raises a flag.
"""
comment_spans = False
if self._comment_spans:
# Finish current comment
while block:
comment_end = self._find_comment_end(block)
if comment_end != -1:
# Comment ends in this block
# Delete tail of comment
block = block[comment_end + 1 :]
break
else:
# Comment spans whole block
# So read the next block, looking for the end
block = self._read_block()
# Search for any further comments
self._comment_spans = False
while True:
comment_start = block.find(b"#") # look for next comment
if comment_start == -1: # no comment found
comment_start = block.find(b"#")
if comment_start == -1:
# No comment found
break
comment_end = self._find_comment_end(block, comment_start)
if comment_end != -1: # comment ends in this block
# delete comment
if comment_end != -1:
# Comment ends in this block
# Delete comment
block = block[:comment_start] + block[comment_end + 1 :]
else: # last comment continues to next block(s)
else:
# Comment continues to next block(s)
block = block[:comment_start]
comment_spans = True
self._comment_spans = True
break
return block, comment_spans
return block
def _decode_bitonal(self):
"""
@ -183,22 +197,13 @@ class PpmPlainDecoder(ImageFile.PyDecoder):
data = bytearray()
total_bytes = self.state.xsize * self.state.ysize
comment_spans = False
while len(data) != total_bytes:
block = self._read_block() # read next block
if not block:
# eof
break
while block and comment_spans:
comment_end = self._find_comment_end(block)
if comment_end != -1: # comment ends in this block
block = block[comment_end + 1 :] # delete tail of previous comment
break
else: # comment spans whole block
block = self._read_block()
block, comment_spans = self._ignore_comments(block)
block = self._ignore_comments(block)
tokens = b"".join(block.split())
for token in tokens:
@ -216,7 +221,6 @@ class PpmPlainDecoder(ImageFile.PyDecoder):
bands = Image.getmodebands(self.mode)
total_bytes = self.state.xsize * self.state.ysize * bands * out_byte_count
comment_spans = False
half_token = False
while len(data) != total_bytes:
block = self._read_block() # read next block
@ -227,15 +231,7 @@ class PpmPlainDecoder(ImageFile.PyDecoder):
# eof
break
while block and comment_spans:
comment_end = self._find_comment_end(block)
if comment_end != -1: # comment ends in this block
block = block[comment_end + 1 :] # delete tail of previous comment
break
else: # comment spans whole block
block = self._read_block()
block, comment_spans = self._ignore_comments(block)
block = self._ignore_comments(block)
if half_token:
block = half_token + block # stitch half_token to new block
@ -264,6 +260,7 @@ class PpmPlainDecoder(ImageFile.PyDecoder):
return data
def decode(self, buffer):
self._comment_spans = False
if self.mode == "1":
data = self._decode_bitonal()
rawmode = "1;8"