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# frozen_string_literal: false
require 'tempfile'
class TestIOBuffer < Test::Unit::TestCase
experimental = Warning[:experimental]
begin
Warning[:experimental] = false
IO::Buffer.new(0)
ensure
Warning[:experimental] = experimental
end
def assert_negative(value)
assert(value < 0, "Expected #{value} to be negative!")
end
def assert_positive(value)
assert(value > 0, "Expected #{value} to be positive!")
end
def test_flags
assert_equal 1, IO::Buffer::EXTERNAL
assert_equal 2, IO::Buffer::INTERNAL
assert_equal 4, IO::Buffer::MAPPED
assert_equal 32, IO::Buffer::LOCKED
assert_equal 64, IO::Buffer::PRIVATE
assert_equal 128, IO::Buffer::READONLY
end
def test_endian
assert_equal 4, IO::Buffer::LITTLE_ENDIAN
assert_equal 8, IO::Buffer::BIG_ENDIAN
assert_equal 8, IO::Buffer::NETWORK_ENDIAN
assert_include [IO::Buffer::LITTLE_ENDIAN, IO::Buffer::BIG_ENDIAN], IO::Buffer::HOST_ENDIAN
end
def test_default_size
assert_equal IO::Buffer::DEFAULT_SIZE, IO::Buffer.new.size
end
def test_new_internal
buffer = IO::Buffer.new(1024, IO::Buffer::INTERNAL)
assert_equal 1024, buffer.size
refute buffer.external?
assert buffer.internal?
refute buffer.mapped?
end
def test_new_mapped
buffer = IO::Buffer.new(1024, IO::Buffer::MAPPED)
assert_equal 1024, buffer.size
refute buffer.external?
refute buffer.internal?
assert buffer.mapped?
end
def test_new_readonly
buffer = IO::Buffer.new(128, IO::Buffer::INTERNAL|IO::Buffer::READONLY)
assert buffer.readonly?
assert_raise IO::Buffer::AccessError do
buffer.set_string("")
end
assert_raise IO::Buffer::AccessError do
buffer.set_string("!", 1)
end
end
def test_file_mapped
buffer = File.open(__FILE__) {|file| IO::Buffer.map(file, nil, 0, IO::Buffer::READONLY)}
contents = buffer.get_string
assert_include contents, "Hello World"
assert_equal Encoding::BINARY, contents.encoding
end
def test_file_mapped_invalid
assert_raise NoMethodError do
IO::Buffer.map("foobar")
end
end
def test_string_mapped
string = "Hello World"
buffer = IO::Buffer.for(string)
refute buffer.readonly?
# Cannot modify string as it's locked by the buffer:
assert_raise RuntimeError do
string[0] = "h"
end
buffer.set_value(:U8, 0, "h".ord)
# Buffer releases it's ownership of the string:
buffer.free
assert_equal "hello World", string
string[0] = "H"
assert_equal "Hello World", string
end
def test_string_mapped_frozen
string = "Hello World".freeze
buffer = IO::Buffer.for(string)
assert buffer.readonly?
end
def test_non_string
not_string = Object.new
assert_raise TypeError do
IO::Buffer.for(not_string)
end
end
def test_resize_mapped
buffer = IO::Buffer.new
buffer.resize(2048)
assert_equal 2048, buffer.size
buffer.resize(4096)
assert_equal 4096, buffer.size
end
def test_resize_preserve
message = "Hello World"
buffer = IO::Buffer.new(1024)
buffer.set_string(message)
buffer.resize(2048)
assert_equal message, buffer.get_string(0, message.bytesize)
end
def test_compare_same_size
buffer1 = IO::Buffer.new(1)
assert_equal buffer1, buffer1
buffer2 = IO::Buffer.new(1)
buffer1.set_value(:U8, 0, 0x10)
buffer2.set_value(:U8, 0, 0x20)
assert_negative buffer1 <=> buffer2
assert_positive buffer2 <=> buffer1
end
def test_compare_different_size
buffer1 = IO::Buffer.new(3)
buffer2 = IO::Buffer.new(5)
assert_negative buffer1 <=> buffer2
assert_positive buffer2 <=> buffer1
end
def test_slice
buffer = IO::Buffer.new(128)
slice = buffer.slice(8, 32)
slice.set_string("Hello World")
assert_equal("Hello World", buffer.get_string(8, 11))
end
def test_slice_bounds
buffer = IO::Buffer.new(128)
assert_raise ArgumentError do
buffer.slice(128, 10)
end
# assert_raise RuntimeError do
# pp buffer.slice(-10, 10)
# end
end
def test_locked
buffer = IO::Buffer.new(128, IO::Buffer::INTERNAL|IO::Buffer::LOCKED)
assert_raise IO::Buffer::LockedError do
buffer.resize(256)
end
assert_equal 128, buffer.size
assert_raise IO::Buffer::LockedError do
buffer.free
end
assert_equal 128, buffer.size
end
def test_get_string
message = "Hello World 🤓"
buffer = IO::Buffer.new(128)
buffer.set_string(message)
chunk = buffer.get_string(0, message.bytesize, Encoding::UTF_8)
assert_equal message, chunk
assert_equal Encoding::UTF_8, chunk.encoding
chunk = buffer.get_string(0, message.bytesize, Encoding::BINARY)
assert_equal Encoding::BINARY, chunk.encoding
end
# We check that values are correctly round tripped.
RANGES = {
:U8 => [0, 2**8-1],
:S8 => [-2**7, 0, 2**7-1],
:U16 => [0, 2**16-1],
:S16 => [-2**15, 0, 2**15-1],
:u16 => [0, 2**16-1],
:s16 => [-2**15, 0, 2**15-1],
:U32 => [0, 2**32-1],
:S32 => [-2**31, 0, 2**31-1],
:u32 => [0, 2**32-1],
:s32 => [-2**31, 0, 2**31-1],
:U64 => [0, 2**64-1],
:S64 => [-2**63, 0, 2**63-1],
:u64 => [0, 2**64-1],
:s64 => [-2**63, 0, 2**63-1],
:F32 => [-1.0, 0.0, 0.5, 1.0, 128.0],
:F64 => [-1.0, 0.0, 0.5, 1.0, 128.0],
}
def test_get_set_primitives
buffer = IO::Buffer.new(128)
RANGES.each do |type, values|
values.each do |value|
buffer.set_value(type, 0, value)
assert_equal value, buffer.get_value(type, 0), "Converting #{value} as #{type}."
end
end
end
def test_clear
buffer = IO::Buffer.new(16)
buffer.set_string("Hello World!")
end
def test_invalidation
input, output = IO.pipe
# (1) rb_write_internal creates IO::Buffer object,
buffer = IO::Buffer.new(128)
# (2) it is passed to (malicious) scheduler
# (3) scheduler starts a thread which call system call with the buffer object
thread = Thread.new{buffer.locked{input.read}}
Thread.pass until thread.stop?
# (4) scheduler returns
# (5) rb_write_internal invalidate the buffer object
assert_raise IO::Buffer::LockedError do
buffer.free
end
# (6) the system call access the memory area after invalidation
output.write("Hello World")
output.close
thread.join
input.close
end
def test_read
io = Tempfile.new
io.write("Hello World")
io.seek(0)
buffer = IO::Buffer.new(128)
buffer.read(io, 5)
assert_equal "Hello", buffer.get_string(0, 5)
ensure
io.close!
end
def test_write
io = Tempfile.new
buffer = IO::Buffer.new(128)
buffer.set_string("Hello")
buffer.write(io, 5)
io.seek(0)
assert_equal "Hello", io.read(5)
ensure
io.close!
end
def test_pread
io = Tempfile.new
io.write("Hello World")
io.seek(0)
buffer = IO::Buffer.new(128)
buffer.pread(io, 5, 6)
assert_equal "World", buffer.get_string(0, 5)
assert_equal 0, io.tell
ensure
io.close!
end
def test_pwrite
io = Tempfile.new
buffer = IO::Buffer.new(128)
buffer.set_string("World")
buffer.pwrite(io, 5, 6)
assert_equal 0, io.tell
io.seek(6)
assert_equal "World", io.read(5)
ensure
io.close!
end
end
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