mirror of
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500 lines
13 KiB
Go
500 lines
13 KiB
Go
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// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package unicode
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import (
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"testing"
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"golang.org/x/text/encoding"
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"golang.org/x/text/encoding/charmap"
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"golang.org/x/text/encoding/internal/enctest"
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"golang.org/x/text/transform"
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)
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func TestBasics(t *testing.T) {
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testCases := []struct {
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e encoding.Encoding
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encPrefix string
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encSuffix string
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encoded string
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utf8 string
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}{{
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e: utf16BEIB,
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encoded: "\x00\x57\x00\xe4\xd8\x35\xdd\x65",
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utf8: "\x57\u00e4\U0001d565",
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}, {
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e: utf16BEEB,
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encPrefix: "\xfe\xff",
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encoded: "\x00\x57\x00\xe4\xd8\x35\xdd\x65",
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utf8: "\x57\u00e4\U0001d565",
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}, {
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e: utf16LEIB,
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encoded: "\x57\x00\xe4\x00\x35\xd8\x65\xdd",
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utf8: "\x57\u00e4\U0001d565",
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}, {
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e: utf16LEEB,
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encPrefix: "\xff\xfe",
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encoded: "\x57\x00\xe4\x00\x35\xd8\x65\xdd",
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utf8: "\x57\u00e4\U0001d565",
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}}
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for _, tc := range testCases {
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enctest.TestEncoding(t, tc.e, tc.encoded, tc.utf8, tc.encPrefix, tc.encSuffix)
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}
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}
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func TestFiles(t *testing.T) {
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enctest.TestFile(t, UTF8)
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enctest.TestFile(t, utf16LEIB)
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}
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func BenchmarkEncoding(b *testing.B) {
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enctest.Benchmark(b, UTF8)
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enctest.Benchmark(b, utf16LEIB)
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}
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var (
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utf16LEIB = UTF16(LittleEndian, IgnoreBOM) // UTF-16LE (atypical interpretation)
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utf16LEUB = UTF16(LittleEndian, UseBOM) // UTF-16, LE
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utf16LEEB = UTF16(LittleEndian, ExpectBOM) // UTF-16, LE, Expect
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utf16BEIB = UTF16(BigEndian, IgnoreBOM) // UTF-16BE (atypical interpretation)
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utf16BEUB = UTF16(BigEndian, UseBOM) // UTF-16 default
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utf16BEEB = UTF16(BigEndian, ExpectBOM) // UTF-16 Expect
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)
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func TestUTF16(t *testing.T) {
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testCases := []struct {
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desc string
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src string
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notEOF bool // the inverse of atEOF
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sizeDst int
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want string
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nSrc int
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err error
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t transform.Transformer
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}{{
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desc: "utf-16 IgnoreBOM dec: empty string",
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t: utf16BEIB.NewDecoder(),
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}, {
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desc: "utf-16 UseBOM dec: empty string",
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t: utf16BEUB.NewDecoder(),
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}, {
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desc: "utf-16 ExpectBOM dec: empty string",
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err: ErrMissingBOM,
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t: utf16BEEB.NewDecoder(),
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}, {
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desc: "utf-16 dec: BOM determines encoding BE (RFC 2781:3.3)",
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src: "\xFE\xFF\xD8\x08\xDF\x45\x00\x3D\x00\x52\x00\x61",
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sizeDst: 100,
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want: "\U00012345=Ra",
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nSrc: 12,
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t: utf16BEUB.NewDecoder(),
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}, {
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desc: "utf-16 dec: BOM determines encoding LE (RFC 2781:3.3)",
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src: "\xFF\xFE\x08\xD8\x45\xDF\x3D\x00\x52\x00\x61\x00",
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sizeDst: 100,
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want: "\U00012345=Ra",
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nSrc: 12,
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t: utf16LEUB.NewDecoder(),
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}, {
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desc: "utf-16 dec: BOM determines encoding LE, change default (RFC 2781:3.3)",
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src: "\xFF\xFE\x08\xD8\x45\xDF\x3D\x00\x52\x00\x61\x00",
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sizeDst: 100,
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want: "\U00012345=Ra",
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nSrc: 12,
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t: utf16BEUB.NewDecoder(),
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}, {
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desc: "utf-16 dec: Fail on missing BOM when required",
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src: "\x08\xD8\x45\xDF\x3D\x00\xFF\xFE\xFE\xFF\x00\x52\x00\x61",
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sizeDst: 100,
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want: "",
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nSrc: 0,
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err: ErrMissingBOM,
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t: utf16BEEB.NewDecoder(),
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}, {
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desc: "utf-16 dec: SHOULD interpret text as big-endian when BOM not present (RFC 2781:4.3)",
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src: "\xD8\x08\xDF\x45\x00\x3D\x00\x52\x00\x61",
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sizeDst: 100,
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want: "\U00012345=Ra",
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nSrc: 10,
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t: utf16BEUB.NewDecoder(),
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}, {
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// This is an error according to RFC 2781. But errors in RFC 2781 are
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// open to interpretations, so I guess this is fine.
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desc: "utf-16le dec: incorrect BOM is an error (RFC 2781:4.1)",
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src: "\xFE\xFF\x08\xD8\x45\xDF\x3D\x00\x52\x00\x61\x00",
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sizeDst: 100,
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want: "\uFFFE\U00012345=Ra",
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nSrc: 12,
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t: utf16LEIB.NewDecoder(),
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}, {
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desc: "utf-16 enc: SHOULD write BOM (RFC 2781:3.3)",
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src: "\U00012345=Ra",
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sizeDst: 100,
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want: "\xFF\xFE\x08\xD8\x45\xDF\x3D\x00\x52\x00\x61\x00",
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nSrc: 7,
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t: utf16LEUB.NewEncoder(),
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}, {
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desc: "utf-16 enc: SHOULD write BOM (RFC 2781:3.3)",
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src: "\U00012345=Ra",
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sizeDst: 100,
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want: "\xFE\xFF\xD8\x08\xDF\x45\x00\x3D\x00\x52\x00\x61",
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nSrc: 7,
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t: utf16BEUB.NewEncoder(),
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}, {
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desc: "utf-16le enc: MUST NOT write BOM (RFC 2781:3.3)",
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src: "\U00012345=Ra",
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sizeDst: 100,
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want: "\x08\xD8\x45\xDF\x3D\x00\x52\x00\x61\x00",
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nSrc: 7,
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t: utf16LEIB.NewEncoder(),
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}, {
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desc: "utf-16be dec: incorrect UTF-16: odd bytes",
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src: "\x00",
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sizeDst: 100,
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want: "\uFFFD",
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nSrc: 1,
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t: utf16BEIB.NewDecoder(),
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}, {
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desc: "utf-16be dec: unpaired surrogate, odd bytes",
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src: "\xD8\x45\x00",
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sizeDst: 100,
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want: "\uFFFD\uFFFD",
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nSrc: 3,
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t: utf16BEIB.NewDecoder(),
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}, {
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desc: "utf-16be dec: unpaired low surrogate + valid text",
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src: "\xD8\x45\x00a",
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sizeDst: 100,
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want: "\uFFFDa",
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nSrc: 4,
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t: utf16BEIB.NewDecoder(),
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}, {
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desc: "utf-16be dec: unpaired low surrogate + valid text + single byte",
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src: "\xD8\x45\x00ab",
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sizeDst: 100,
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want: "\uFFFDa\uFFFD",
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nSrc: 5,
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t: utf16BEIB.NewDecoder(),
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}, {
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desc: "utf-16le dec: unpaired high surrogate",
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src: "\x00\x00\x00\xDC\x12\xD8",
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sizeDst: 100,
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want: "\x00\uFFFD\uFFFD",
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nSrc: 6,
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t: utf16LEIB.NewDecoder(),
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}, {
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desc: "utf-16be dec: two unpaired low surrogates",
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src: "\xD8\x45\xD8\x12",
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sizeDst: 100,
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want: "\uFFFD\uFFFD",
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nSrc: 4,
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t: utf16BEIB.NewDecoder(),
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}, {
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desc: "utf-16be dec: short dst",
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src: "\x00a",
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sizeDst: 0,
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want: "",
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nSrc: 0,
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t: utf16BEIB.NewDecoder(),
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err: transform.ErrShortDst,
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}, {
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desc: "utf-16be dec: short dst surrogate",
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src: "\xD8\xF5\xDC\x12",
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sizeDst: 3,
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want: "",
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nSrc: 0,
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t: utf16BEIB.NewDecoder(),
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err: transform.ErrShortDst,
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}, {
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desc: "utf-16be dec: short dst trailing byte",
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src: "\x00",
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sizeDst: 2,
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want: "",
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nSrc: 0,
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t: utf16BEIB.NewDecoder(),
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err: transform.ErrShortDst,
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}, {
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desc: "utf-16be dec: short src",
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src: "\x00",
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notEOF: true,
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sizeDst: 3,
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want: "",
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nSrc: 0,
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t: utf16BEIB.NewDecoder(),
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err: transform.ErrShortSrc,
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}, {
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desc: "utf-16 enc",
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src: "\U00012345=Ra",
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sizeDst: 100,
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want: "\xFE\xFF\xD8\x08\xDF\x45\x00\x3D\x00\x52\x00\x61",
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nSrc: 7,
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t: utf16BEUB.NewEncoder(),
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}, {
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desc: "utf-16 enc: short dst normal",
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src: "\U00012345=Ra",
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sizeDst: 9,
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want: "\xD8\x08\xDF\x45\x00\x3D\x00\x52",
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nSrc: 6,
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t: utf16BEIB.NewEncoder(),
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err: transform.ErrShortDst,
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}, {
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desc: "utf-16 enc: short dst surrogate",
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src: "\U00012345=Ra",
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sizeDst: 3,
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want: "",
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nSrc: 0,
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t: utf16BEIB.NewEncoder(),
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err: transform.ErrShortDst,
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}, {
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desc: "utf-16 enc: short src",
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src: "\U00012345=Ra\xC2",
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notEOF: true,
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sizeDst: 100,
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want: "\xD8\x08\xDF\x45\x00\x3D\x00\x52\x00\x61",
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nSrc: 7,
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t: utf16BEIB.NewEncoder(),
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err: transform.ErrShortSrc,
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}, {
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desc: "utf-16be dec: don't change byte order mid-stream",
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src: "\xFE\xFF\xD8\x08\xDF\x45\x00\x3D\xFF\xFE\x00\x52\x00\x61",
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sizeDst: 100,
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want: "\U00012345=\ufffeRa",
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nSrc: 14,
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t: utf16BEUB.NewDecoder(),
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}, {
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desc: "utf-16le dec: don't change byte order mid-stream",
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src: "\xFF\xFE\x08\xD8\x45\xDF\x3D\x00\xFF\xFE\xFE\xFF\x52\x00\x61\x00",
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sizeDst: 100,
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want: "\U00012345=\ufeff\ufffeRa",
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nSrc: 16,
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t: utf16LEUB.NewDecoder(),
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}}
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for i, tc := range testCases {
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b := make([]byte, tc.sizeDst)
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nDst, nSrc, err := tc.t.Transform(b, []byte(tc.src), !tc.notEOF)
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if err != tc.err {
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t.Errorf("%d:%s: error was %v; want %v", i, tc.desc, err, tc.err)
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}
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if got := string(b[:nDst]); got != tc.want {
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t.Errorf("%d:%s: result was %q: want %q", i, tc.desc, got, tc.want)
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}
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if nSrc != tc.nSrc {
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t.Errorf("%d:%s: nSrc was %d; want %d", i, tc.desc, nSrc, tc.nSrc)
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}
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}
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}
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func TestUTF8Decoder(t *testing.T) {
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testCases := []struct {
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desc string
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src string
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notEOF bool // the inverse of atEOF
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sizeDst int
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want string
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nSrc int
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err error
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}{{
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desc: "empty string, empty dest buffer",
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}, {
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desc: "empty string",
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sizeDst: 8,
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}, {
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desc: "empty string, streaming",
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notEOF: true,
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sizeDst: 8,
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}, {
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desc: "ascii",
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src: "abcde",
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sizeDst: 8,
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want: "abcde",
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nSrc: 5,
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}, {
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desc: "ascii and error",
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src: "ab\x80de",
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sizeDst: 7,
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want: "ab\ufffdde",
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nSrc: 5,
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}, {
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desc: "valid two-byte sequence",
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src: "a\u0300bc",
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sizeDst: 7,
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want: "a\u0300bc",
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nSrc: 5,
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}, {
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desc: "valid three-byte sequence",
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src: "a\u0300中",
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sizeDst: 7,
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want: "a\u0300中",
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nSrc: 6,
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}, {
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desc: "valid four-byte sequence",
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src: "a中\U00016F50",
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sizeDst: 8,
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want: "a中\U00016F50",
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nSrc: 8,
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}, {
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desc: "short source buffer",
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src: "abc\xf0\x90",
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notEOF: true,
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sizeDst: 10,
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want: "abc",
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nSrc: 3,
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err: transform.ErrShortSrc,
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}, {
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// We don't check for the maximal subpart of an ill-formed subsequence
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// at the end of an open segment.
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desc: "complete invalid that looks like short at end",
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src: "abc\xf0\x80",
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notEOF: true,
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sizeDst: 10,
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want: "abc", // instead of "abc\ufffd\ufffd",
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nSrc: 3,
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err: transform.ErrShortSrc,
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}, {
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desc: "incomplete sequence at end",
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src: "a\x80bc\xf0\x90",
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sizeDst: 9,
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want: "a\ufffdbc\ufffd",
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nSrc: 6,
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}, {
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desc: "invalid second byte",
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src: "abc\xf0dddd",
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sizeDst: 10,
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want: "abc\ufffddddd",
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nSrc: 8,
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}, {
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desc: "invalid second byte at end",
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src: "abc\xf0d",
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sizeDst: 10,
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want: "abc\ufffdd",
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nSrc: 5,
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}, {
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desc: "invalid third byte",
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src: "a\u0300bc\xf0\x90dddd",
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sizeDst: 12,
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want: "a\u0300bc\ufffddddd",
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nSrc: 11,
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}, {
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desc: "invalid third byte at end",
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src: "a\u0300bc\xf0\x90d",
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sizeDst: 12,
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want: "a\u0300bc\ufffdd",
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nSrc: 8,
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}, {
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desc: "invalid fourth byte, tight buffer",
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src: "a\u0300bc\xf0\x90\x80d",
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sizeDst: 9,
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want: "a\u0300bc\ufffdd",
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nSrc: 9,
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}, {
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desc: "invalid fourth byte at end",
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src: "a\u0300bc\xf0\x90\x80",
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sizeDst: 8,
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want: "a\u0300bc\ufffd",
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nSrc: 8,
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}, {
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||
|
desc: "invalid fourth byte and short four byte sequence",
|
||
|
src: "a\u0300bc\xf0\x90\x80\xf0\x90\x80",
|
||
|
notEOF: true,
|
||
|
sizeDst: 20,
|
||
|
want: "a\u0300bc\ufffd",
|
||
|
nSrc: 8,
|
||
|
err: transform.ErrShortSrc,
|
||
|
}, {
|
||
|
desc: "valid four-byte sequence overflowing short buffer",
|
||
|
src: "a\u0300bc\xf0\x90\x80\x80",
|
||
|
notEOF: true,
|
||
|
sizeDst: 8,
|
||
|
want: "a\u0300bc",
|
||
|
nSrc: 5,
|
||
|
err: transform.ErrShortDst,
|
||
|
}, {
|
||
|
desc: "invalid fourth byte at end short, but short dst",
|
||
|
src: "a\u0300bc\xf0\x90\x80\xf0\x90\x80",
|
||
|
notEOF: true,
|
||
|
sizeDst: 8,
|
||
|
// More bytes would fit in the buffer, but this seems to require a more
|
||
|
// complicated and slower algorithm.
|
||
|
want: "a\u0300bc", // instead of "a\u0300bc"
|
||
|
nSrc: 5,
|
||
|
err: transform.ErrShortDst,
|
||
|
}, {
|
||
|
desc: "short dst for error",
|
||
|
src: "abc\x80",
|
||
|
notEOF: true,
|
||
|
sizeDst: 5,
|
||
|
want: "abc",
|
||
|
nSrc: 3,
|
||
|
err: transform.ErrShortDst,
|
||
|
}, {
|
||
|
desc: "adjusting short dst buffer",
|
||
|
src: "abc\x80ef",
|
||
|
notEOF: true,
|
||
|
sizeDst: 6,
|
||
|
want: "abc\ufffd",
|
||
|
nSrc: 4,
|
||
|
err: transform.ErrShortDst,
|
||
|
}}
|
||
|
tr := UTF8.NewDecoder()
|
||
|
for i, tc := range testCases {
|
||
|
b := make([]byte, tc.sizeDst)
|
||
|
nDst, nSrc, err := tr.Transform(b, []byte(tc.src), !tc.notEOF)
|
||
|
if err != tc.err {
|
||
|
t.Errorf("%d:%s: error was %v; want %v", i, tc.desc, err, tc.err)
|
||
|
}
|
||
|
if got := string(b[:nDst]); got != tc.want {
|
||
|
t.Errorf("%d:%s: result was %q: want %q", i, tc.desc, got, tc.want)
|
||
|
}
|
||
|
if nSrc != tc.nSrc {
|
||
|
t.Errorf("%d:%s: nSrc was %d; want %d", i, tc.desc, nSrc, tc.nSrc)
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
func TestBOMOverride(t *testing.T) {
|
||
|
dec := BOMOverride(charmap.CodePage437.NewDecoder())
|
||
|
dst := make([]byte, 100)
|
||
|
for i, tc := range []struct {
|
||
|
src string
|
||
|
atEOF bool
|
||
|
dst string
|
||
|
nSrc int
|
||
|
err error
|
||
|
}{
|
||
|
0: {"H\x82ll\x93", true, "Héllô", 5, nil},
|
||
|
1: {"\uFEFFHéllö", true, "Héllö", 10, nil},
|
||
|
2: {"\xFE\xFF\x00H\x00e\x00l\x00l\x00o", true, "Hello", 12, nil},
|
||
|
3: {"\xFF\xFEH\x00e\x00l\x00l\x00o\x00", true, "Hello", 12, nil},
|
||
|
4: {"\uFEFF", true, "", 3, nil},
|
||
|
5: {"\xFE\xFF", true, "", 2, nil},
|
||
|
6: {"\xFF\xFE", true, "", 2, nil},
|
||
|
7: {"\xEF\xBB", true, "\u2229\u2557", 2, nil},
|
||
|
8: {"\xEF", true, "\u2229", 1, nil},
|
||
|
9: {"", true, "", 0, nil},
|
||
|
10: {"\xFE", true, "\u25a0", 1, nil},
|
||
|
11: {"\xFF", true, "\u00a0", 1, nil},
|
||
|
12: {"\xEF\xBB", false, "", 0, transform.ErrShortSrc},
|
||
|
13: {"\xEF", false, "", 0, transform.ErrShortSrc},
|
||
|
14: {"", false, "", 0, transform.ErrShortSrc},
|
||
|
15: {"\xFE", false, "", 0, transform.ErrShortSrc},
|
||
|
16: {"\xFF", false, "", 0, transform.ErrShortSrc},
|
||
|
17: {"\xFF\xFE", false, "", 0, transform.ErrShortSrc},
|
||
|
} {
|
||
|
dec.Reset()
|
||
|
nDst, nSrc, err := dec.Transform(dst, []byte(tc.src), tc.atEOF)
|
||
|
got := string(dst[:nDst])
|
||
|
if nSrc != tc.nSrc {
|
||
|
t.Errorf("%d: nSrc: got %d; want %d", i, nSrc, tc.nSrc)
|
||
|
}
|
||
|
if got != tc.dst {
|
||
|
t.Errorf("%d: got %+q; want %+q", i, got, tc.dst)
|
||
|
}
|
||
|
if err != tc.err {
|
||
|
t.Errorf("%d: error: got %v; want %v", i, err, tc.err)
|
||
|
}
|
||
|
}
|
||
|
}
|