Coverage for /pythoncovmergedfiles/medio/medio/usr/local/lib/python3.11/site-packages/PIL/ImtImagePlugin.py: 72%

1# 

2# The Python Imaging Library. 

3# $Id$ 

4# 

5# IM Tools support for PIL 

6# 

7# history: 

8# 1996-05-27 fl Created (read 8-bit images only) 

9# 2001-02-17 fl Use 're' instead of 'regex' (Python 2.1) (0.2) 

10# 

11# Copyright (c) Secret Labs AB 1997-2001. 

12# Copyright (c) Fredrik Lundh 1996-2001. 

13# 

14# See the README file for information on usage and redistribution. 

15# 

16from __future__ import annotations 

17 

18import re 

19 

20from . import Image, ImageFile 

21 

22# 

23# -------------------------------------------------------------------- 

24 

25field = re.compile(rb"([a-z]*) ([^ \r\n]*)") 

26 

27 

28## 

29# Image plugin for IM Tools images. 

30 

31 

32class ImtImageFile(ImageFile.ImageFile): 

33 format = "IMT" 

34 format_description = "IM Tools" 

35 

36 def _open(self) -> None: 

37 # Quick rejection: if there's not a LF among the first 

38 # 100 bytes, this is (probably) not a text header. 

39 

40 assert self.fp is not None 

41 

42 buffer = self.fp.read(100) 

43 if b"\n" not in buffer: 

44 msg = "not an IM file" 

45 raise SyntaxError(msg) 

46 

47 xsize = ysize = 0 

48 

49 while True: 

50 if buffer: 

51 s = buffer[:1] 

52 buffer = buffer[1:] 

53 else: 

54 s = self.fp.read(1) 

55 if not s: 

56 break 

57 

58 if s == b"\x0c": 

59 # image data begins 

60 self.tile = [ 

61 ImageFile._Tile( 

62 "raw", 

63 (0, 0) + self.size, 

64 self.fp.tell() - len(buffer), 

65 self.mode, 

66 ) 

67 ] 

68 

69 break 

70 

71 else: 

72 # read key/value pair 

73 if b"\n" not in buffer: 

74 buffer += self.fp.read(100) 

75 lines = buffer.split(b"\n") 

76 s += lines.pop(0) 

77 buffer = b"\n".join(lines) 

78 if len(s) == 1 or len(s) > 100: 

79 break 

80 if s[0] == ord(b"*"): 

81 continue # comment 

82 

83 m = field.match(s) 

84 if not m: 

85 break 

86 k, v = m.group(1, 2) 

87 if k == b"width": 

88 xsize = int(v) 

89 self._size = xsize, ysize 

90 elif k == b"height": 

91 ysize = int(v) 

92 self._size = xsize, ysize 

93 elif k == b"pixel" and v == b"n8": 

94 self._mode = "L" 

95 

96 

97# 

98# -------------------------------------------------------------------- 

99 

100Image.register_open(ImtImageFile.format, ImtImageFile) 

101 

102# 

103# no extension registered (".im" is simply too common)