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require_relative '../../../spec_helper'
describe "IO::Buffer#transfer" do
after :each do
@buffer&.free
@buffer = nil
end
context "with a buffer created with .new" do
it "transfers internal memory to a new buffer, nullifying the original" do
buffer = IO::Buffer.new(4)
info = buffer.to_s
@buffer = buffer.transfer
@buffer.to_s.should == info
buffer.null?.should be_true
end
it "transfers mapped memory to a new buffer, nullifying the original" do
buffer = IO::Buffer.new(4, IO::Buffer::MAPPED)
info = buffer.to_s
@buffer = buffer.transfer
@buffer.to_s.should == info
buffer.null?.should be_true
end
end
context "with a file-backed buffer created with .map" do
it "transfers mapped memory to a new buffer, nullifying the original" do
File.open(__FILE__, "r") do |file|
buffer = IO::Buffer.map(file, nil, 0, IO::Buffer::READONLY)
info = buffer.to_s
@buffer = buffer.transfer
@buffer.to_s.should == info
buffer.null?.should be_true
end
end
end
context "with a String-backed buffer created with .for" do
context "without a block" do
it "transfers memory to a new buffer, nullifying the original" do
buffer = IO::Buffer.for("test")
info = buffer.to_s
@buffer = buffer.transfer
@buffer.to_s.should == info
buffer.null?.should be_true
end
end
context "with a block" do
it "transfers memory to a new buffer, breaking the transaction by nullifying the original" do
IO::Buffer.for(+"test") do |buffer|
info = buffer.to_s
@buffer = buffer.transfer
@buffer.to_s.should == info
buffer.null?.should be_true
end
@buffer.null?.should be_false
end
end
end
ruby_version_is "3.3" do
context "with a String-backed buffer created with .string" do
it "transfers memory to a new buffer, breaking the transaction by nullifying the original" do
IO::Buffer.string(4) do |buffer|
info = buffer.to_s
@buffer = buffer.transfer
@buffer.to_s.should == info
buffer.null?.should be_true
end
@buffer.null?.should be_false
end
end
end
it "allows multiple transfers" do
buffer_1 = IO::Buffer.new(4)
buffer_2 = buffer_1.transfer
@buffer = buffer_2.transfer
buffer_1.null?.should be_true
buffer_2.null?.should be_true
@buffer.null?.should be_false
end
it "is disallowed while locked, raising IO::Buffer::LockedError" do
@buffer = IO::Buffer.new(4)
@buffer.locked do
-> { @buffer.transfer }.should raise_error(IO::Buffer::LockedError, "Cannot transfer ownership of locked buffer!")
end
end
context "with a slice of a buffer" do
it "transfers source to a new slice, not touching the buffer" do
@buffer = IO::Buffer.new(4)
slice = @buffer.slice(0, 2)
@buffer.set_string("test")
new_slice = slice.transfer
slice.null?.should be_true
new_slice.null?.should be_false
@buffer.null?.should be_false
new_slice.set_string("ea")
@buffer.get_string.should == "east"
end
it "nullifies buffer, invalidating the slice" do
buffer = IO::Buffer.new(4)
slice = buffer.slice(0, 2)
@buffer = buffer.transfer
slice.null?.should be_false
slice.valid?.should be_false
-> { slice.get_string }.should raise_error(IO::Buffer::InvalidatedError, "Buffer has been invalidated!")
end
end
end
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