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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package unicode
import (
"testing"
"golang.org/x/text/transform"
)
func TestUTF8Decoder(t *testing.T) {
testCases := []struct {
desc string
src string
notEOF bool // the inverse of atEOF
sizeDst int
want string
nSrc int
err error
}{{
desc: "empty string, empty dest buffer",
}, {
desc: "empty string",
sizeDst: 8,
}, {
desc: "empty string, streaming",
notEOF: true,
sizeDst: 8,
}, {
desc: "ascii",
src: "abcde",
sizeDst: 8,
want: "abcde",
nSrc: 5,
}, {
desc: "ascii and error",
src: "ab\x80de",
sizeDst: 7,
want: "ab\ufffdde",
nSrc: 5,
}, {
desc: "valid two-byte sequence",
src: "a\u0300bc",
sizeDst: 7,
want: "a\u0300bc",
nSrc: 5,
}, {
desc: "valid three-byte sequence",
src: "a\u0300中",
sizeDst: 7,
want: "a\u0300中",
nSrc: 6,
}, {
desc: "valid four-byte sequence",
src: "a中\U00016F50",
sizeDst: 8,
want: "a中\U00016F50",
nSrc: 8,
}, {
desc: "short source buffer",
src: "abc\xf0\x90",
notEOF: true,
sizeDst: 10,
want: "abc",
nSrc: 3,
err: transform.ErrShortSrc,
}, {
// We don't check for the maximal subpart of an ill-formed subsequence
// at the end of an open segment.
desc: "complete invalid that looks like short at end",
src: "abc\xf0\x80",
notEOF: true,
sizeDst: 10,
want: "abc", // instead of "abc\ufffd\ufffd",
nSrc: 3,
err: transform.ErrShortSrc,
}, {
desc: "incomplete sequence at end",
src: "a\x80bc\xf0\x90",
sizeDst: 9,
want: "a\ufffdbc\ufffd",
nSrc: 6,
}, {
desc: "invalid second byte",
src: "abc\xf0dddd",
sizeDst: 10,
want: "abc\ufffddddd",
nSrc: 8,
}, {
desc: "invalid second byte at end",
src: "abc\xf0d",
sizeDst: 10,
want: "abc\ufffdd",
nSrc: 5,
}, {
desc: "invalid third byte",
src: "a\u0300bc\xf0\x90dddd",
sizeDst: 12,
want: "a\u0300bc\ufffddddd",
nSrc: 11,
}, {
desc: "invalid third byte at end",
src: "a\u0300bc\xf0\x90d",
sizeDst: 12,
want: "a\u0300bc\ufffdd",
nSrc: 8,
}, {
desc: "invalid fourth byte, tight buffer",
src: "a\u0300bc\xf0\x90\x80d",
sizeDst: 9,
want: "a\u0300bc\ufffdd",
nSrc: 9,
}, {
desc: "invalid fourth byte at end",
src: "a\u0300bc\xf0\x90\x80",
sizeDst: 8,
want: "a\u0300bc\ufffd",
nSrc: 8,
}, {
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)
}
}
}
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