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#
# This file is part of ruby-ffi.
# For licensing, see LICENSE.SPECS
#
require File.expand_path(File.join(File.dirname(__FILE__), "spec_helper"))
describe "String tests" do
include FFI
module StrLibTest
extend FFI::Library
ffi_lib TestLibrary::PATH
attach_function :ptr_ret_pointer, [ :pointer, :int], :string
attach_function :pointer_buffer_equals, :buffer_equals, [ :pointer, :string, :size_t ], :int
attach_function :string_dummy, [ :string ], :void
attach_function :string_null, [ ], :string
end
it "A String can be passed to a :pointer argument" do
str = "string buffer"
expect(StrLibTest.pointer_buffer_equals(str, str, str.bytesize)).to eq(1)
expect(StrLibTest.pointer_buffer_equals(str + "a", str + "a", str.bytesize + 1)).to eq(1)
expect(StrLibTest.pointer_buffer_equals(str + "\0", str, str.bytesize + 1)).to eq(1)
expect(StrLibTest.pointer_buffer_equals(str + "a", str + "b", str.bytesize + 1)).to eq(0)
end
it "Poison null byte raises error" do
s = "123\0abc"
expect{ StrLibTest.pointer_buffer_equals("", s, 0) }.to raise_error(ArgumentError)
expect( StrLibTest.pointer_buffer_equals(s, "", 0) ).to eq(1)
end
it "casts nil as NULL pointer" do
expect(StrLibTest.string_dummy(nil)).to be_nil
end
it "return nil for NULL char*" do
expect(StrLibTest.string_null).to be_nil
end
it "reads an array of strings until encountering a NULL pointer" do
strings = ["foo", "bar", "baz", "testing", "ffi"]
ptrary = FFI::MemoryPointer.new(:pointer, 6)
ary = strings.inject([]) do |a, str|
f = FFI::MemoryPointer.new(1024)
f.put_string(0, str)
a << f
end
ary.insert(3, nil)
ptrary.write_array_of_pointer(ary)
expect(ptrary.get_array_of_string(0)).to eq(["foo", "bar", "baz"])
end
it "reads an array of strings of the size specified, substituting nil when a pointer is NULL" do
strings = ["foo", "bar", "baz", "testing", "ffi"]
ptrary = FFI::MemoryPointer.new(:pointer, 6)
ary = strings.inject([]) do |a, str|
f = FFI::MemoryPointer.new(1024)
f.put_string(0, str)
a << f
end
ary.insert(2, nil)
ptrary.write_array_of_pointer(ary)
expect(ptrary.get_array_of_string(0, 4)).to eq(["foo", "bar", nil, "baz"])
end
it "reads an array of strings, taking a memory offset parameter" do
strings = ["foo", "bar", "baz", "testing", "ffi"]
ptrary = FFI::MemoryPointer.new(:pointer, 5)
ary = strings.inject([]) do |a, str|
f = FFI::MemoryPointer.new(1024)
f.put_string(0, str)
a << f
end
ptrary.write_array_of_pointer(ary)
expect(ptrary.get_array_of_string(2 * FFI.type_size(:pointer), 3)).to eq(["baz", "testing", "ffi"])
end
it "raises an IndexError when trying to read an array of strings out of bounds" do
strings = ["foo", "bar", "baz", "testing", "ffi"]
ptrary = FFI::MemoryPointer.new(:pointer, 5)
ary = strings.inject([]) do |a, str|
f = FFI::MemoryPointer.new(1024)
f.put_string(0, str)
a << f
end
ptrary.write_array_of_pointer(ary)
expect { ptrary.get_array_of_string(0, 6) }.to raise_error(IndexError)
end
it "raises an IndexError when trying to read an array of strings using a negative offset" do
strings = ["foo", "bar", "baz", "testing", "ffi"]
ptrary = FFI::MemoryPointer.new(:pointer, 5)
ary = strings.inject([]) do |a, str|
f = FFI::MemoryPointer.new(1024)
f.put_string(0, str)
a << f
end
ptrary.write_array_of_pointer(ary)
expect { ptrary.get_array_of_string(-1) }.to raise_error(IndexError)
end
describe "#write_string" do
# https://github.com/ffi/ffi/issues/805
describe "with no length given" do
it "writes no final \\0" do
ptr = FFI::MemoryPointer.new(8)
ptr.write_int64(-1)
ptr.write_string("äbc")
expect(ptr.read_bytes(5)).to eq("äbc\xff".b)
end
it "doesn't write anything when size is exceeded" do
ptr = FFI::MemoryPointer.new(8)
ptr.write_int64(-1)
expect do
ptr.write_string("äbcdefgh")
end.to raise_error(IndexError, /out of bounds/i)
expect(ptr.read_int64).to eq(-1)
end
it "fits into memory" do
ptr = FFI::MemoryPointer.new(5)
ptr.write_string("äbcd")
expect(ptr.read_string).to eq("äbcd".b)
end
end
describe "with a length" do
it "writes a final \\0" do
ptr = FFI::MemoryPointer.new(8)
ptr.write_int64(-1)
ptr.write_string("äbcd", 3)
expect(ptr.read_bytes(5)).to eq("äb\xFF\xFF".b)
end
it "doesn't write anything when size is exceeded" do
ptr = FFI::MemoryPointer.new(8)
ptr.write_int64(-1)
expect do
ptr.write_string("äbcdefghi", 9)
end.to raise_error(IndexError, /out of bounds/i)
expect(ptr.read_int64).to eq(-1)
end
it "fits into memory" do
ptr = FFI::MemoryPointer.new(5)
ptr.write_string("äbcde", 5)
expect(ptr.read_string).to eq("äbcd".b)
end
end
end
describe "#put_string" do
it "writes a final \\0" do
ptr = FFI::MemoryPointer.new(8)
ptr.write_int64(-1)
ptr.put_string(0, "äbc")
expect(ptr.read_bytes(5)).to eq("äbc\x00".b)
expect(ptr.read_string).to eq("äbc".b)
end
end
end
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