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author | 2022-11-13 23:46:45 +0530 | |
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committer | 2022-11-13 23:46:45 +0530 | |
commit | 9468226a9e2e2ab8cdd599f1d8538e860ca86120 (patch) | |
tree | 0a77ada226d6db80639f96b438bf83e4e756edb5 /env/lib/python3.10/site-packages/PIL/ContainerIO.py | |
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Diffstat (limited to 'env/lib/python3.10/site-packages/PIL/ContainerIO.py')
-rw-r--r-- | env/lib/python3.10/site-packages/PIL/ContainerIO.py | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/env/lib/python3.10/site-packages/PIL/ContainerIO.py b/env/lib/python3.10/site-packages/PIL/ContainerIO.py new file mode 100644 index 0000000..45e80b3 --- /dev/null +++ b/env/lib/python3.10/site-packages/PIL/ContainerIO.py @@ -0,0 +1,120 @@ +# +# The Python Imaging Library. +# $Id$ +# +# a class to read from a container file +# +# History: +# 1995-06-18 fl Created +# 1995-09-07 fl Added readline(), readlines() +# +# Copyright (c) 1997-2001 by Secret Labs AB +# Copyright (c) 1995 by Fredrik Lundh +# +# See the README file for information on usage and redistribution. +# + + +import io + + +class ContainerIO: + """ + A file object that provides read access to a part of an existing + file (for example a TAR file). + """ + + def __init__(self, file, offset, length): + """ + Create file object. + + :param file: Existing file. + :param offset: Start of region, in bytes. + :param length: Size of region, in bytes. + """ + self.fh = file + self.pos = 0 + self.offset = offset + self.length = length + self.fh.seek(offset) + + ## + # Always false. + + def isatty(self): + return False + + def seek(self, offset, mode=io.SEEK_SET): + """ + Move file pointer. + + :param offset: Offset in bytes. + :param mode: Starting position. Use 0 for beginning of region, 1 + for current offset, and 2 for end of region. You cannot move + the pointer outside the defined region. + """ + if mode == 1: + self.pos = self.pos + offset + elif mode == 2: + self.pos = self.length + offset + else: + self.pos = offset + # clamp + self.pos = max(0, min(self.pos, self.length)) + self.fh.seek(self.offset + self.pos) + + def tell(self): + """ + Get current file pointer. + + :returns: Offset from start of region, in bytes. + """ + return self.pos + + def read(self, n=0): + """ + Read data. + + :param n: Number of bytes to read. If omitted or zero, + read until end of region. + :returns: An 8-bit string. + """ + if n: + n = min(n, self.length - self.pos) + else: + n = self.length - self.pos + if not n: # EOF + return b"" if "b" in self.fh.mode else "" + self.pos = self.pos + n + return self.fh.read(n) + + def readline(self): + """ + Read a line of text. + + :returns: An 8-bit string. + """ + s = b"" if "b" in self.fh.mode else "" + newline_character = b"\n" if "b" in self.fh.mode else "\n" + while True: + c = self.read(1) + if not c: + break + s = s + c + if c == newline_character: + break + return s + + def readlines(self): + """ + Read multiple lines of text. + + :returns: A list of 8-bit strings. + """ + lines = [] + while True: + s = self.readline() + if not s: + break + lines.append(s) + return lines |