pax_global_header00006660000000000000000000000064137512753040014521gustar00rootroot0000000000000052 comment=6ae8f945ca96f30defc7e8ab12ec5d10cf86ded4 utfbom-1.1.1/000077500000000000000000000000001375127530400130155ustar00rootroot00000000000000utfbom-1.1.1/.gitignore000066400000000000000000000007321375127530400150070ustar00rootroot00000000000000# Binaries for programs and plugins *.exe *.dll *.so *.dylib *.o *.a # Folders _obj _test # Architecture specific extensions/prefixes *.[568vq] [568vq].out *.cgo1.go *.cgo2.c _cgo_defun.c _cgo_gotypes.go _cgo_export.* _testmain.go *.prof # Test binary, build with `go test -c` *.test # Output of the go coverage tool, specifically when used with LiteIDE *.out # Project-local glide cache, RE: https://github.com/Masterminds/glide/issues/736 .glide/ # Gogland .idea/utfbom-1.1.1/.travis.yml000066400000000000000000000014031375127530400151240ustar00rootroot00000000000000language: go sudo: false go: - 1.10.x - 1.11.x - 1.12.x - 1.13.x - 1.14.x - 1.15.x cache: directories: - $HOME/.cache/go-build - $HOME/gopath/pkg/mod env: global: - GO111MODULE=on before_install: - go get github.com/mattn/goveralls - go get golang.org/x/tools/cmd/cover - go get golang.org/x/tools/cmd/goimports - go get golang.org/x/lint/golint script: - gofiles=$(find ./ -name '*.go') && [ -z "$gofiles" ] || unformatted=$(goimports -l $gofiles) && [ -z "$unformatted" ] || (echo >&2 "Go files must be formatted with gofmt. Following files has problem:\n $unformatted" && false) - golint ./... # This won't break the build, just show warnings - $HOME/gopath/bin/goveralls -service=travis-ci utfbom-1.1.1/LICENSE000066400000000000000000000261631375127530400140320ustar00rootroot00000000000000 Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. Definitions. "License" shall mean the terms and conditions for use, reproduction, and distribution as defined by Sections 1 through 9 of this document. "Licensor" shall mean the copyright owner or entity authorized by the copyright owner that is granting the License. "Legal Entity" shall mean the union of the acting entity and all other entities that control, are controlled by, or are under common control with that entity. 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See the License for the specific language governing permissions and limitations under the License. utfbom-1.1.1/README.md000066400000000000000000000037201375127530400142760ustar00rootroot00000000000000# utfbom [![Godoc](https://godoc.org/github.com/dimchansky/utfbom?status.png)](https://godoc.org/github.com/dimchansky/utfbom) [![License](https://img.shields.io/:license-apache-blue.svg)](https://opensource.org/licenses/Apache-2.0) [![Build Status](https://travis-ci.org/dimchansky/utfbom.svg?branch=master)](https://travis-ci.org/dimchansky/utfbom) [![Go Report Card](https://goreportcard.com/badge/github.com/dimchansky/utfbom)](https://goreportcard.com/report/github.com/dimchansky/utfbom) [![Coverage Status](https://coveralls.io/repos/github/dimchansky/utfbom/badge.svg?branch=master)](https://coveralls.io/github/dimchansky/utfbom?branch=master) The package utfbom implements the detection of the BOM (Unicode Byte Order Mark) and removing as necessary. It can also return the encoding detected by the BOM. ## Installation go get -u github.com/dimchansky/utfbom ## Example ```go package main import ( "bytes" "fmt" "io/ioutil" "github.com/dimchansky/utfbom" ) func main() { trySkip([]byte("\xEF\xBB\xBFhello")) trySkip([]byte("hello")) } func trySkip(byteData []byte) { fmt.Println("Input:", byteData) // just skip BOM output, err := ioutil.ReadAll(utfbom.SkipOnly(bytes.NewReader(byteData))) if err != nil { fmt.Println(err) return } fmt.Println("ReadAll with BOM skipping", output) // skip BOM and detect encoding sr, enc := utfbom.Skip(bytes.NewReader(byteData)) fmt.Printf("Detected encoding: %s\n", enc) output, err = ioutil.ReadAll(sr) if err != nil { fmt.Println(err) return } fmt.Println("ReadAll with BOM detection and skipping", output) fmt.Println() } ``` Output: ``` $ go run main.go Input: [239 187 191 104 101 108 108 111] ReadAll with BOM skipping [104 101 108 108 111] Detected encoding: UTF8 ReadAll with BOM detection and skipping [104 101 108 108 111] Input: [104 101 108 108 111] ReadAll with BOM skipping [104 101 108 108 111] Detected encoding: Unknown ReadAll with BOM detection and skipping [104 101 108 108 111] ``` utfbom-1.1.1/go.mod000066400000000000000000000000441375127530400141210ustar00rootroot00000000000000module github.com/dimchansky/utfbom utfbom-1.1.1/utfbom.go000066400000000000000000000107461375127530400146500ustar00rootroot00000000000000// Package utfbom implements the detection of the BOM (Unicode Byte Order Mark) and removing as necessary. // It wraps an io.Reader object, creating another object (Reader) that also implements the io.Reader // interface but provides automatic BOM checking and removing as necessary. package utfbom import ( "errors" "io" ) // Encoding is type alias for detected UTF encoding. type Encoding int // Constants to identify detected UTF encodings. const ( // Unknown encoding, returned when no BOM was detected Unknown Encoding = iota // UTF8, BOM bytes: EF BB BF UTF8 // UTF-16, big-endian, BOM bytes: FE FF UTF16BigEndian // UTF-16, little-endian, BOM bytes: FF FE UTF16LittleEndian // UTF-32, big-endian, BOM bytes: 00 00 FE FF UTF32BigEndian // UTF-32, little-endian, BOM bytes: FF FE 00 00 UTF32LittleEndian ) // String returns a user-friendly string representation of the encoding. Satisfies fmt.Stringer interface. func (e Encoding) String() string { switch e { case UTF8: return "UTF8" case UTF16BigEndian: return "UTF16BigEndian" case UTF16LittleEndian: return "UTF16LittleEndian" case UTF32BigEndian: return "UTF32BigEndian" case UTF32LittleEndian: return "UTF32LittleEndian" default: return "Unknown" } } const maxConsecutiveEmptyReads = 100 // Skip creates Reader which automatically detects BOM (Unicode Byte Order Mark) and removes it as necessary. // It also returns the encoding detected by the BOM. // If the detected encoding is not needed, you can call the SkipOnly function. func Skip(rd io.Reader) (*Reader, Encoding) { // Is it already a Reader? b, ok := rd.(*Reader) if ok { return b, Unknown } enc, left, err := detectUtf(rd) return &Reader{ rd: rd, buf: left, err: err, }, enc } // SkipOnly creates Reader which automatically detects BOM (Unicode Byte Order Mark) and removes it as necessary. func SkipOnly(rd io.Reader) *Reader { r, _ := Skip(rd) return r } // Reader implements automatic BOM (Unicode Byte Order Mark) checking and // removing as necessary for an io.Reader object. type Reader struct { rd io.Reader // reader provided by the client buf []byte // buffered data err error // last error } // Read is an implementation of io.Reader interface. // The bytes are taken from the underlying Reader, but it checks for BOMs, removing them as necessary. func (r *Reader) Read(p []byte) (n int, err error) { if len(p) == 0 { return 0, nil } if r.buf == nil { if r.err != nil { return 0, r.readErr() } return r.rd.Read(p) } // copy as much as we can n = copy(p, r.buf) r.buf = nilIfEmpty(r.buf[n:]) return n, nil } func (r *Reader) readErr() error { err := r.err r.err = nil return err } var errNegativeRead = errors.New("utfbom: reader returned negative count from Read") func detectUtf(rd io.Reader) (enc Encoding, buf []byte, err error) { buf, err = readBOM(rd) if len(buf) >= 4 { if isUTF32BigEndianBOM4(buf) { return UTF32BigEndian, nilIfEmpty(buf[4:]), err } if isUTF32LittleEndianBOM4(buf) { return UTF32LittleEndian, nilIfEmpty(buf[4:]), err } } if len(buf) > 2 && isUTF8BOM3(buf) { return UTF8, nilIfEmpty(buf[3:]), err } if (err != nil && err != io.EOF) || (len(buf) < 2) { return Unknown, nilIfEmpty(buf), err } if isUTF16BigEndianBOM2(buf) { return UTF16BigEndian, nilIfEmpty(buf[2:]), err } if isUTF16LittleEndianBOM2(buf) { return UTF16LittleEndian, nilIfEmpty(buf[2:]), err } return Unknown, nilIfEmpty(buf), err } func readBOM(rd io.Reader) (buf []byte, err error) { const maxBOMSize = 4 var bom [maxBOMSize]byte // used to read BOM // read as many bytes as possible for nEmpty, n := 0, 0; err == nil && len(buf) < maxBOMSize; buf = bom[:len(buf)+n] { if n, err = rd.Read(bom[len(buf):]); n < 0 { panic(errNegativeRead) } if n > 0 { nEmpty = 0 } else { nEmpty++ if nEmpty >= maxConsecutiveEmptyReads { err = io.ErrNoProgress } } } return } func isUTF32BigEndianBOM4(buf []byte) bool { return buf[0] == 0x00 && buf[1] == 0x00 && buf[2] == 0xFE && buf[3] == 0xFF } func isUTF32LittleEndianBOM4(buf []byte) bool { return buf[0] == 0xFF && buf[1] == 0xFE && buf[2] == 0x00 && buf[3] == 0x00 } func isUTF8BOM3(buf []byte) bool { return buf[0] == 0xEF && buf[1] == 0xBB && buf[2] == 0xBF } func isUTF16BigEndianBOM2(buf []byte) bool { return buf[0] == 0xFE && buf[1] == 0xFF } func isUTF16LittleEndianBOM2(buf []byte) bool { return buf[0] == 0xFF && buf[1] == 0xFE } func nilIfEmpty(buf []byte) (res []byte) { if len(buf) > 0 { res = buf } return } utfbom-1.1.1/utfbom_test.go000066400000000000000000000157121375127530400157050ustar00rootroot00000000000000package utfbom import ( "io" "io/ioutil" "reflect" "testing" "testing/iotest" "time" ) var testCases = []struct { name string input []byte inputError error encoding Encoding output []byte }{ {"1", []byte{}, nil, Unknown, []byte{}}, {"2", []byte("hello"), nil, Unknown, []byte("hello")}, {"3", []byte("\xEF\xBB\xBF"), nil, UTF8, []byte{}}, {"4", []byte("\xEF\xBB\xBFhello"), nil, UTF8, []byte("hello")}, {"5", []byte("\xFE\xFF"), nil, UTF16BigEndian, []byte{}}, {"6", []byte("\xFF\xFE"), nil, UTF16LittleEndian, []byte{}}, {"7", []byte("\x00\x00\xFE\xFF"), nil, UTF32BigEndian, []byte{}}, {"8", []byte("\xFF\xFE\x00\x00"), nil, UTF32LittleEndian, []byte{}}, {"5", []byte("\xFE\xFF\x00\x68\x00\x65\x00\x6C\x00\x6C\x00\x6F"), nil, UTF16BigEndian, []byte{0x00, 0x68, 0x00, 0x65, 0x00, 0x6C, 0x00, 0x6C, 0x00, 0x6F}}, {"6", []byte("\xFF\xFE\x68\x00\x65\x00\x6C\x00\x6C\x00\x6F\x00"), nil, UTF16LittleEndian, []byte{0x68, 0x00, 0x65, 0x00, 0x6C, 0x00, 0x6C, 0x00, 0x6F, 0x00}}, {"7", []byte("\x00\x00\xFE\xFF\x00\x00\x00\x68\x00\x00\x00\x65\x00\x00\x00\x6C\x00\x00\x00\x6C\x00\x00\x00\x6F"), nil, UTF32BigEndian, []byte{0x00, 0x00, 0x00, 0x68, 0x00, 0x00, 0x00, 0x65, 0x00, 0x00, 0x00, 0x6C, 0x00, 0x00, 0x00, 0x6C, 0x00, 0x00, 0x00, 0x6F}}, {"8", []byte("\xFF\xFE\x00\x00\x68\x00\x00\x00\x65\x00\x00\x00\x6C\x00\x00\x00\x6C\x00\x00\x00\x6F\x00\x00\x00"), nil, UTF32LittleEndian, []byte{0x68, 0x00, 0x00, 0x00, 0x65, 0x00, 0x00, 0x00, 0x6C, 0x00, 0x00, 0x00, 0x6C, 0x00, 0x00, 0x00, 0x6F, 0x00, 0x00, 0x00}}, {"9", []byte("\xEF"), nil, Unknown, []byte("\xEF")}, {"10", []byte("\xEF\xBB"), nil, Unknown, []byte("\xEF\xBB")}, {"11", []byte("\xEF\xBB\xBF"), io.ErrClosedPipe, UTF8, []byte{}}, {"12", []byte("\xFE\xFF"), io.ErrClosedPipe, Unknown, []byte("\xFE\xFF")}, {"13", []byte("\xFE"), io.ErrClosedPipe, Unknown, []byte("\xFE")}, {"14", []byte("\xFF\xFE"), io.ErrClosedPipe, Unknown, []byte("\xFF\xFE")}, {"15", []byte("\x00\x00\xFE\xFF"), io.ErrClosedPipe, UTF32BigEndian, []byte{}}, {"16", []byte("\x00\x00\xFE"), io.ErrClosedPipe, Unknown, []byte{0x00, 0x00, 0xFE}}, {"17", []byte("\x00\x00"), io.ErrClosedPipe, Unknown, []byte{0x00, 0x00}}, {"18", []byte("\x00"), io.ErrClosedPipe, Unknown, []byte{0x00}}, {"19", []byte("\xFF\xFE\x00\x00"), io.ErrClosedPipe, UTF32LittleEndian, []byte{}}, {"20", []byte("\xFF\xFE\x00"), io.ErrClosedPipe, Unknown, []byte{0xFF, 0xFE, 0x00}}, {"21", []byte("\xFF\xFE"), io.ErrClosedPipe, Unknown, []byte{0xFF, 0xFE}}, {"22", []byte("\xFF"), io.ErrClosedPipe, Unknown, []byte{0xFF}}, {"23", []byte("\x68\x65"), nil, Unknown, []byte{0x68, 0x65}}, } type sliceReader struct { input []byte inputError error } func (r *sliceReader) Read(p []byte) (n int, err error) { if len(p) == 0 { return } if err = r.getError(); err != nil { return } n = copy(p, r.input) r.input = r.input[n:] err = r.getError() return } func (r *sliceReader) getError() (err error) { if len(r.input) == 0 { if r.inputError == nil { err = io.EOF } else { err = r.inputError } } return } var readMakers = []struct { name string fn func(io.Reader) io.Reader }{ {"full", func(r io.Reader) io.Reader { return r }}, {"byte", iotest.OneByteReader}, } func TestSkip(t *testing.T) { for _, tc := range testCases { for _, readMaker := range readMakers { r := readMaker.fn(&sliceReader{tc.input, tc.inputError}) sr, enc := Skip(r) if enc != tc.encoding { t.Fatalf("test %v reader=%s: expected encoding %v, but got %v", tc.name, readMaker.name, tc.encoding, enc) } output, err := ioutil.ReadAll(sr) if !reflect.DeepEqual(output, tc.output) { t.Fatalf("test %v reader=%s: expected to read %+#v, but got %+#v", tc.name, readMaker.name, tc.output, output) } if err != tc.inputError { t.Fatalf("test %v reader=%s: expected to get %+#v error, but got %+#v", tc.name, readMaker.name, tc.inputError, err) } } } } func TestSkipSkip(t *testing.T) { for _, tc := range testCases { for _, readMaker := range readMakers { r := readMaker.fn(&sliceReader{tc.input, tc.inputError}) sr0, _ := Skip(r) sr, enc := Skip(sr0) if enc != Unknown { t.Fatalf("test %v reader=%s: expected encoding %v, but got %v", tc.name, readMaker.name, Unknown, enc) } output, err := ioutil.ReadAll(sr) if !reflect.DeepEqual(output, tc.output) { t.Fatalf("test %v reader=%s: expected to read %+#v, but got %+#v", tc.name, readMaker.name, tc.output, output) } if err != tc.inputError { t.Fatalf("test %v reader=%s: expected to get %+#v error, but got %+#v", tc.name, readMaker.name, tc.inputError, err) } } } } func TestSkipOnly(t *testing.T) { for _, tc := range testCases { for _, readMaker := range readMakers { r := readMaker.fn(&sliceReader{tc.input, tc.inputError}) sr := SkipOnly(r) output, err := ioutil.ReadAll(sr) if !reflect.DeepEqual(output, tc.output) { t.Fatalf("test %v reader=%s: expected to read %+#v, but got %+#v", tc.name, readMaker.name, tc.output, output) } if err != tc.inputError { t.Fatalf("test %v reader=%s: expected to get %+#v error, but got %+#v", tc.name, readMaker.name, tc.inputError, err) } } } } type zeroReader struct{} func (zeroReader) Read(p []byte) (int, error) { return 0, nil } type readerEncoding struct { Rd *Reader Enc Encoding } func TestSkipZeroReader(t *testing.T) { var z zeroReader c := make(chan readerEncoding) go func() { r, enc := Skip(z) c <- readerEncoding{r, enc} }() select { case re := <-c: if re.Enc != Unknown { t.Error("Unknown encoding expected") } else { var b [1]byte n, err := re.Rd.Read(b[:]) if n != 0 { t.Error("unexpected bytes count:", n) } if err != io.ErrNoProgress { t.Error("unexpected error:", err) } } case <-time.After(time.Second): t.Error("test timed out (endless loop in Skip?)") } } func TestSkipOnlyZeroReader(t *testing.T) { var z zeroReader c := make(chan *Reader) go func() { r := SkipOnly(z) c <- r }() select { case r := <-c: var b [1]byte n, err := r.Read(b[:]) if n != 0 { t.Error("unexpected bytes count:", n) } if err != io.ErrNoProgress { t.Error("unexpected error:", err) } case <-time.After(time.Second): t.Error("test timed out (endless loop in Skip?)") } } func TestReader_ReadEmpty(t *testing.T) { for _, tc := range testCases { for _, readMaker := range readMakers { r := readMaker.fn(&sliceReader{tc.input, tc.inputError}) sr := SkipOnly(r) n, err := sr.Read(nil) if n != 0 { t.Fatalf("test %v reader=%s: expected to read zero bytes, but got %v", tc.name, readMaker.name, n) } if err != nil { t.Fatalf("test %v reader=%s: expected to get error, but got %+#v", tc.name, readMaker.name, err) } } } } func TestEncoding_String(t *testing.T) { for e := Unknown; e <= UTF32LittleEndian; e++ { s := e.String() if s == "" { t.Errorf("no string for %#v", e) } } s := Encoding(999).String() if s != "Unknown" { t.Errorf("wrong string '%s' for invalid encoding", s) } }