diff options
author | Adam Langley <agl@golang.org> | 2011-04-13 15:12:28 -0400 |
---|---|---|
committer | Adam Langley <agl@golang.org> | 2011-04-13 15:12:28 -0400 |
commit | 6392fc75cf5d51f69f9e353da81c84e488dbf629 (patch) | |
tree | b7ef4e1c9bc44297d7849c1a6f1d9169f09906d3 | |
parent | 0be2ef3fc474f2716bf60114ddd2a0b481970460 (diff) | |
download | go-6392fc75cf5d51f69f9e353da81c84e488dbf629.tar.gz go-6392fc75cf5d51f69f9e353da81c84e488dbf629.zip |
bufio: add ReadLine
It matches encoding/line exactly and the tests are copied from there.
If we land this, then encoding/line will get marked as deprecated then
deleted in time.
R=rsc, rog, peterGo
CC=golang-dev
https://golang.org/cl/4389046
-rw-r--r-- | src/pkg/bufio/bufio.go | 27 | ||||
-rw-r--r-- | src/pkg/bufio/bufio_test.go | 126 | ||||
-rw-r--r-- | src/pkg/crypto/openpgp/armor/armor.go | 6 | ||||
-rw-r--r-- | src/pkg/http/cgi/host.go | 4 |
4 files changed, 158 insertions, 5 deletions
diff --git a/src/pkg/bufio/bufio.go b/src/pkg/bufio/bufio.go index cd08be31b6..32a25afae9 100644 --- a/src/pkg/bufio/bufio.go +++ b/src/pkg/bufio/bufio.go @@ -282,6 +282,33 @@ func (b *Reader) ReadSlice(delim byte) (line []byte, err os.Error) { panic("not reached") } +// ReadLine tries to return a single line, not including the end-of-line bytes. +// If the line was too long for the buffer then isPrefix is set and the +// beginning of the line is returned. The rest of the line will be returned +// from future calls. isPrefix will be false when returning the last fragment +// of the line. The returned buffer is only valid until the next call to +// ReadLine. ReadLine either returns a non-nil line or it returns an error, +// never both. +func (b *Reader) ReadLine() (line []byte, isPrefix bool, err os.Error) { + line, err = b.ReadSlice('\n') + if err == ErrBufferFull { + return line, true, nil + } + + if len(line) == 0 { + return + } + err = nil + + if line[len(line)-1] == '\n' { + line = line[:len(line)-1] + } + if len(line) > 0 && line[len(line)-1] == '\r' { + line = line[:len(line)-1] + } + return +} + // ReadBytes reads until the first occurrence of delim in the input, // returning a slice containing the data up to and including the delimiter. // If ReadBytes encounters an error before finding a delimiter, diff --git a/src/pkg/bufio/bufio_test.go b/src/pkg/bufio/bufio_test.go index 8028e04dcd..123adac29a 100644 --- a/src/pkg/bufio/bufio_test.go +++ b/src/pkg/bufio/bufio_test.go @@ -9,6 +9,7 @@ import ( "bytes" "fmt" "io" + "io/ioutil" "os" "strings" "testing" @@ -570,3 +571,128 @@ func TestPeekThenUnreadRune(t *testing.T) { r.UnreadRune() r.ReadRune() // Used to panic here } + +var testOutput = []byte("0123456789abcdefghijklmnopqrstuvwxy") +var testInput = []byte("012\n345\n678\n9ab\ncde\nfgh\nijk\nlmn\nopq\nrst\nuvw\nxy") +var testInputrn = []byte("012\r\n345\r\n678\r\n9ab\r\ncde\r\nfgh\r\nijk\r\nlmn\r\nopq\r\nrst\r\nuvw\r\nxy\r\n\n\r\n") + +// TestReader wraps a []byte and returns reads of a specific length. +type testReader struct { + data []byte + stride int +} + +func (t *testReader) Read(buf []byte) (n int, err os.Error) { + n = t.stride + if n > len(t.data) { + n = len(t.data) + } + if n > len(buf) { + n = len(buf) + } + copy(buf, t.data) + t.data = t.data[n:] + if len(t.data) == 0 { + err = os.EOF + } + return +} + +func testReadLine(t *testing.T, input []byte) { + //for stride := 1; stride < len(input); stride++ { + for stride := 1; stride < 2; stride++ { + done := 0 + reader := testReader{input, stride} + l, _ := NewReaderSize(&reader, len(input)+1) + for { + line, isPrefix, err := l.ReadLine() + if len(line) > 0 && err != nil { + t.Errorf("ReadLine returned both data and error: %s", err) + } + if isPrefix { + t.Errorf("ReadLine returned prefix") + } + if err != nil { + if err != os.EOF { + t.Fatalf("Got unknown error: %s", err) + } + break + } + if want := testOutput[done : done+len(line)]; !bytes.Equal(want, line) { + t.Errorf("Bad line at stride %d: want: %x got: %x", stride, want, line) + } + done += len(line) + } + if done != len(testOutput) { + t.Errorf("ReadLine didn't return everything: got: %d, want: %d (stride: %d)", done, len(testOutput), stride) + } + } +} + +func TestReadLine(t *testing.T) { + testReadLine(t, testInput) + testReadLine(t, testInputrn) +} + +func TestLineTooLong(t *testing.T) { + buf := bytes.NewBuffer([]byte("aaabbbcc\n")) + l, _ := NewReaderSize(buf, 3) + line, isPrefix, err := l.ReadLine() + if !isPrefix || !bytes.Equal(line, []byte("aaa")) || err != nil { + t.Errorf("bad result for first line: %x %s", line, err) + } + line, isPrefix, err = l.ReadLine() + if !isPrefix || !bytes.Equal(line, []byte("bbb")) || err != nil { + t.Errorf("bad result for second line: %x", line) + } + line, isPrefix, err = l.ReadLine() + if isPrefix || !bytes.Equal(line, []byte("cc")) || err != nil { + t.Errorf("bad result for third line: %x", line) + } + line, isPrefix, err = l.ReadLine() + if isPrefix || err == nil { + t.Errorf("expected no more lines: %x %s", line, err) + } +} + +func TestReadAfterLines(t *testing.T) { + line1 := "line1" + restData := "line2\nline 3\n" + inbuf := bytes.NewBuffer([]byte(line1 + "\n" + restData)) + outbuf := new(bytes.Buffer) + maxLineLength := len(line1) + len(restData)/2 + l, _ := NewReaderSize(inbuf, maxLineLength) + line, isPrefix, err := l.ReadLine() + if isPrefix || err != nil || string(line) != line1 { + t.Errorf("bad result for first line: isPrefix=%v err=%v line=%q", isPrefix, err, string(line)) + } + n, err := io.Copy(outbuf, l) + if int(n) != len(restData) || err != nil { + t.Errorf("bad result for Read: n=%d err=%v", n, err) + } + if outbuf.String() != restData { + t.Errorf("bad result for Read: got %q; expected %q", outbuf.String(), restData) + } +} + +func TestReadEmptyBuffer(t *testing.T) { + l, _ := NewReaderSize(bytes.NewBuffer(nil), 10) + line, isPrefix, err := l.ReadLine() + if err != os.EOF { + t.Errorf("expected EOF from ReadLine, got '%s' %t %s", line, isPrefix, err) + } +} + +func TestLinesAfterRead(t *testing.T) { + l, _ := NewReaderSize(bytes.NewBuffer([]byte("foo")), 10) + _, err := ioutil.ReadAll(l) + if err != nil { + t.Error(err) + return + } + + line, isPrefix, err := l.ReadLine() + if err != os.EOF { + t.Errorf("expected EOF from ReadLine, got '%s' %t %s", line, isPrefix, err) + } +} diff --git a/src/pkg/crypto/openpgp/armor/armor.go b/src/pkg/crypto/openpgp/armor/armor.go index 0c5ae9d716..d695a8c332 100644 --- a/src/pkg/crypto/openpgp/armor/armor.go +++ b/src/pkg/crypto/openpgp/armor/armor.go @@ -7,10 +7,10 @@ package armor import ( + "bufio" "bytes" "crypto/openpgp/error" "encoding/base64" - "encoding/line" "io" "os" ) @@ -63,7 +63,7 @@ var armorEndOfLine = []byte("-----") // lineReader wraps a line based reader. It watches for the end of an armor // block and records the expected CRC value. type lineReader struct { - in *line.Reader + in *bufio.Reader buf []byte eof bool crc uint32 @@ -156,7 +156,7 @@ func (r *openpgpReader) Read(p []byte) (n int, err os.Error) { // given Reader is not usable after calling this function: an arbitary amount // of data may have been read past the end of the block. func Decode(in io.Reader) (p *Block, err os.Error) { - r := line.NewReader(in, 100) + r, _ := bufio.NewReaderSize(in, 100) var line []byte ignoreNext := false diff --git a/src/pkg/http/cgi/host.go b/src/pkg/http/cgi/host.go index 2272387374..a713d7c3c3 100644 --- a/src/pkg/http/cgi/host.go +++ b/src/pkg/http/cgi/host.go @@ -15,8 +15,8 @@ package cgi import ( + "bufio" "bytes" - "encoding/line" "exec" "fmt" "http" @@ -142,7 +142,7 @@ func (h *Handler) ServeHTTP(rw http.ResponseWriter, req *http.Request) { go io.Copy(cmd.Stdin, req.Body) } - linebody := line.NewReader(cmd.Stdout, 1024) + linebody, _ := bufio.NewReaderSize(cmd.Stdout, 1024) headers := rw.Header() statusCode := http.StatusOK for { |