107 lines
1.8 KiB
Ruby
107 lines
1.8 KiB
Ruby
# -*- coding: binary -*-
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require 'postgres_msf'
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require 'postgres/binary_writer'
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require 'postgres/binary_reader'
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# Namespace for Metasploit branch.
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module Msf
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module Db
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# Fixed size buffer.
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class Buffer
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class Error < RuntimeError; end
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class EOF < Error; end
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def self.from_string(str)
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new(str)
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end
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def self.of_size(size)
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raise ArgumentError if size < 0
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new('#' * size)
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end
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def initialize(content)
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@size = content.size
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@content = content
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@position = 0
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end
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def size
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@size
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end
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def position
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@position
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end
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def position=(new_pos)
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raise ArgumentError if new_pos < 0 or new_pos > @size
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@position = new_pos
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end
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def at_end?
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@position == @size
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end
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def content
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@content
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end
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def read(n)
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raise EOF, 'cannot read beyond the end of buffer' if @position + n > @size
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str = @content[@position, n]
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@position += n
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str
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end
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def write(str)
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sz = str.size
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raise EOF, 'cannot write beyond the end of buffer' if @position + sz > @size
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@content[@position, sz] = str
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@position += sz
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self
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end
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def copy_from_stream(stream, n)
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raise ArgumentError if n < 0
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while n > 0
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str = stream.read(n)
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write(str)
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n -= str.size
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end
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raise if n < 0
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end
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NUL = "\000"
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def write_cstring(cstr)
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raise ArgumentError, "Invalid Ruby/cstring" if cstr.include?(NUL)
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write(cstr)
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write(NUL)
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end
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# returns a Ruby string without the trailing NUL character
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def read_cstring
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nul_pos = @content.index(NUL, @position)
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raise Error, "no cstring found!" unless nul_pos
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sz = nul_pos - @position
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str = @content[@position, sz]
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@position += sz + 1
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return str
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end
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# read till the end of the buffer
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def read_rest
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read(self.size-@position)
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end
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include BinaryWriterMixin
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include BinaryReaderMixin
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end
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end
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end
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