/usr/lib/ruby/vendor_ruby/ffi/pointer.rb is in ruby-ffi 1.9.10debian-1build2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 | #
# Copyright (C) 2008, 2009 Wayne Meissner
# Copyright (c) 2007, 2008 Evan Phoenix
#
# This file is part of ruby-ffi.
#
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice, this
# list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
# * Neither the name of the Ruby FFI project nor the names of its contributors
# may be used to endorse or promote products derived from this software
# without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
require 'ffi/platform'
module FFI
class Pointer
# Pointer size
SIZE = Platform::ADDRESS_SIZE / 8
# Return the size of a pointer on the current platform, in bytes
# @return [Numeric]
def self.size
SIZE
end
# @param [nil,Numeric] len length of string to return
# @return [String]
# Read pointer's contents as a string, or the first +len+ bytes of the
# equivalent string if +len+ is not +nil+.
def read_string(len=nil)
if len
get_bytes(0, len)
else
get_string(0)
end
end
# @param [Numeric] len length of string to return
# @return [String]
# Read the first +len+ bytes of pointer's contents as a string.
#
# Same as:
# ptr.read_string(len) # with len not nil
def read_string_length(len)
get_bytes(0, len)
end
# @return [String]
# Read pointer's contents as a string.
#
# Same as:
# ptr.read_string # with no len
def read_string_to_null
get_string(0)
end
# @param [String] str string to write
# @param [Numeric] len length of string to return
# @return [self]
# Write +len+ first bytes of +str+ in pointer's contents.
#
# Same as:
# ptr.write_string(str, len) # with len not nil
def write_string_length(str, len)
put_bytes(0, str, 0, len)
end
# @param [String] str string to write
# @param [Numeric] len length of string to return
# @return [self]
# Write +str+ in pointer's contents, or first +len+ bytes if
# +len+ is not +nil+.
def write_string(str, len=nil)
len = str.bytesize unless len
# Write the string data without NUL termination
put_bytes(0, str, 0, len)
end
# @param [Type] type type of data to read from pointer's contents
# @param [Symbol] reader method to send to +self+ to read +type+
# @param [Numeric] length
# @return [Array]
# Read an array of +type+ of length +length+.
# @example
# ptr.read_array_of_type(TYPE_UINT8, :get_uint8, 4) # -> [1, 2, 3, 4]
def read_array_of_type(type, reader, length)
ary = []
size = FFI.type_size(type)
tmp = self
length.times { |j|
ary << tmp.send(reader)
tmp += size unless j == length-1 # avoid OOB
}
ary
end
# @param [Type] type type of data to write to pointer's contents
# @param [Symbol] writer method to send to +self+ to write +type+
# @param [Array] ary
# @return [self]
# Write +ary+ in pointer's contents as +type+.
# @example
# ptr.write_array_of_type(TYPE_UINT8, :put_uint8, [1, 2, 3 ,4])
def write_array_of_type(type, writer, ary)
size = FFI.type_size(type)
tmp = self
ary.each_with_index {|i, j|
tmp.send(writer, i)
tmp += size unless j == ary.length-1 # avoid OOB
}
self
end
end
end
|