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-rw-r--r--PIL/ContainerIO.py116
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diff --git a/PIL/ContainerIO.py b/PIL/ContainerIO.py
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-#
-# The Python Imaging Library.
-# $Id: ContainerIO.py 2134 2004-10-06 08:55:20Z fredrik $
-#
-# 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.
-#
-
-##
-# A file object that provides read access to a part of an existing
-# file (for example a TAR file).
-
-class ContainerIO:
-
- ##
- # Create file object.
- #
- # @param file Existing file.
- # @param offset Start of region, in bytes.
- # @param length Size of region, in bytes.
-
- def __init__(self, file, offset, length):
- self.fh = file
- self.pos = 0
- self.offset = offset
- self.length = length
- self.fh.seek(offset)
-
- ##
- # Always false.
-
- def isatty(self):
- return 0
-
- ##
- # 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.
-
- def seek(self, offset, mode = 0):
- 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)
-
- ##
- # Get current file pointer.
- #
- # @return Offset from start of region, in bytes.
-
- def tell(self):
- return self.pos
-
- ##
- # Read data.
- #
- # @def read(bytes=0)
- # @param bytes Number of bytes to read. If omitted or zero,
- # read until end of region.
- # @return An 8-bit string.
-
- def read(self, n = 0):
- if n:
- n = min(n, self.length - self.pos)
- else:
- n = self.length - self.pos
- if not n: # EOF
- return ""
- self.pos = self.pos + n
- return self.fh.read(n)
-
- ##
- # Read a line of text.
- #
- # @return An 8-bit string.
-
- def readline(self):
- s = ""
- while 1:
- c = self.read(1)
- if not c:
- break
- s = s + c
- if c == "\n":
- break
- return s
-
- ##
- # Read multiple lines of text.
- #
- # @return A list of 8-bit strings.
-
- def readlines(self):
- l = []
- while 1:
- s = self.readline()
- if not s:
- break
- l.append(s)
- return l