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require "rubygems"
require File.expand_path(File.join(File.dirname(__FILE__), "spec_helper"))
module CTest
extend FFI::Library
ffi_lib FFI::Library::LIBC
attach_function :strcat, [:pointer, :pointer], :pointer
end
describe "MemoryPointer" do
it "makes a pointer from a string" do
m = FFI::MemoryPointer.from_string("FFI is Awesome")
m.type_size.should == 15
end
it "reads back a string" do
m = FFI::MemoryPointer.from_string("FFI is Awesome")
m.read_string.should == "FFI is Awesome"
end
it "makes a pointer for a certain number of bytes" do
m = FFI::MemoryPointer.new(8)
m.write_array_of_int([1,2])
m.read_array_of_int(2).should == [1,2]
end
it "allows access to an element of the pointer (as an array)" do
m = FFI::MemoryPointer.new(:int, 2)
m.write_array_of_int([1,2])
m[0].read_int.should == 1
m[1].read_int.should == 2
end
it "allows writing as an int" do
m = FFI::MemoryPointer.new(:int)
m.write_int(1)
m.read_int.should == 1
end
it "allows writing as a long" do
m = FFI::MemoryPointer.new(:long)
m.write_long(10)
m.read_long.should == 10
end
it "raises an error if you try putting a long into a pointer of size 1" do
m = FFI::MemoryPointer.new(1)
lambda { m.write_long(10) }.should raise_error
end
it "raises an error if you try putting an int into a pointer of size 1" do
m = FFI::MemoryPointer.new(1)
lambda { m.write_int(10) }.should raise_error
end
# it "does not raise IndexError for opaque pointers" do
# m = FFI::MemoryPointer.new(8)
# p2 = FFI::MemoryPointer.new(1024)
# m.write_long(p2.address)
# p = m.read_pointer
# lambda { p.write_int(10) }.should_not raise_error
# end
it "makes a pointer for a certain type" do
m = FFI::MemoryPointer.new(:int)
m.write_int(10)
m.read_int.should == 10
end
it "makes a memory pointer for a number of a certain type" do
m = FFI::MemoryPointer.new(:int, 2)
m.write_array_of_int([1,2])
m.read_array_of_int(2).should == [1,2]
end
it "makes a pointer for an object responding to #size" do
m = FFI::MemoryPointer.new(Struct.new(:size).new(8))
m.write_array_of_int([1,2])
m.read_array_of_int(2).should == [1,2]
end
it "makes a pointer for a number of an object responding to #size" do
m = FFI::MemoryPointer.new(Struct.new(:size).new(4), 2)
m.write_array_of_int([1,2])
m.read_array_of_int(2).should == [1,2]
end
it "MemoryPointer#address returns correct value" do
m = FFI::MemoryPointer.new(:long_long)
magic = 0x12345678
m.write_long(magic)
m.read_pointer.address.should == magic
end
it "MemoryPointer#null? returns true for zero value" do
m = FFI::MemoryPointer.new(:long_long)
m.write_long(0)
m.read_pointer.null?.should == true
end
it "MemoryPointer#null? returns false for non-zero value" do
m = FFI::MemoryPointer.new(:long_long)
m.write_long(0x12345678)
m.read_pointer.null?.should == false
end
end
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