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#
# Copyright (C) 2008, 2009 Wayne Meissner
# Copyright (c) 2007, 2008 Evan Phoenix
# 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 Evan Phoenix 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
SIZE = Platform::ADDRESS_SIZE / 8
# Return the size of a pointer on the current platform, in bytes
def self.size
SIZE
end
# Write +obj+ as a C int at the memory pointed to.
def write_int(obj)
put_int32(0, obj)
end
# Read a C int from the memory pointed to.
def read_int
get_int32(0)
end
# Write +obj+ as a C long at the memory pointed to.
def write_long(obj)
put_long(0, obj)
end
# Read a C long from the memory pointed to.
def read_long
get_long(0)
end
# Write +obj+ as a C long long at the memory pointed to.
def write_long_long(obj)
put_int64(0, obj)
end
# Read a C long long from the memory pointed to.
def read_long_long
get_int64(0)
end
def read_pointer
get_pointer(0)
end
def write_pointer(ptr)
put_pointer(0, ptr)
end
def read_float
get_float32(0)
end
def write_float(obj)
put_float32(0, obj)
end
def read_string(len=nil)
if len
get_bytes(0, len)
else
get_string(0)
end
end
def read_string_length(len)
get_bytes(0, len)
end
def read_string_to_null
get_string(0)
end
def write_string_length(str, len)
put_bytes(0, str, 0, len)
end
def write_string(str, len=nil)
len = str.size unless len
# Write the string data without NUL termination
put_bytes(0, str, 0, len)
end
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
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
def read_array_of_int(length)
get_array_of_int32(0, length)
end
def write_array_of_int(ary)
put_array_of_int32(0, ary)
end
def read_array_of_long(length)
get_array_of_long(0, length)
end
def write_array_of_long(ary)
put_array_of_long(0, ary)
end
def read_array_of_pointer(length)
read_array_of_type(:pointer, :read_pointer, length)
end
def write_array_of_pointer(ary)
write_array_of_type(:pointer, :write_pointer, ary)
end
end
end
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