diff options
Diffstat (limited to 'vendor/github.com/philhofer/fwd')
| -rw-r--r-- | vendor/github.com/philhofer/fwd/LICENSE.md | 7 | ||||
| -rw-r--r-- | vendor/github.com/philhofer/fwd/README.md | 315 | ||||
| -rw-r--r-- | vendor/github.com/philhofer/fwd/reader.go | 383 | ||||
| -rw-r--r-- | vendor/github.com/philhofer/fwd/writer.go | 224 | ||||
| -rw-r--r-- | vendor/github.com/philhofer/fwd/writer_appengine.go | 5 | ||||
| -rw-r--r-- | vendor/github.com/philhofer/fwd/writer_unsafe.go | 18 |
6 files changed, 952 insertions, 0 deletions
diff --git a/vendor/github.com/philhofer/fwd/LICENSE.md b/vendor/github.com/philhofer/fwd/LICENSE.md new file mode 100644 index 00000000..1ac6a81f --- /dev/null +++ b/vendor/github.com/philhofer/fwd/LICENSE.md @@ -0,0 +1,7 @@ +Copyright (c) 2014-2015, Philip Hofer + +Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
\ No newline at end of file diff --git a/vendor/github.com/philhofer/fwd/README.md b/vendor/github.com/philhofer/fwd/README.md new file mode 100644 index 00000000..38349af3 --- /dev/null +++ b/vendor/github.com/philhofer/fwd/README.md @@ -0,0 +1,315 @@ + +# fwd + import "github.com/philhofer/fwd" + +The `fwd` package provides a buffered reader +and writer. Each has methods that help improve +the encoding/decoding performance of some binary +protocols. + +The `fwd.Writer` and `fwd.Reader` type provide similar +functionality to their counterparts in `bufio`, plus +a few extra utility methods that simplify read-ahead +and write-ahead. I wrote this package to improve serialization +performance for <a href="http://github.com/tinylib/msgp">http://github.com/tinylib/msgp</a>, +where it provided about a 2x speedup over `bufio` for certain +workloads. However, care must be taken to understand the semantics of the +extra methods provided by this package, as they allow +the user to access and manipulate the buffer memory +directly. + +The extra methods for `fwd.Reader` are `Peek`, `Skip` +and `Next`. `(*fwd.Reader).Peek`, unlike `(*bufio.Reader).Peek`, +will re-allocate the read buffer in order to accommodate arbitrarily +large read-ahead. `(*fwd.Reader).Skip` skips the next `n` bytes +in the stream, and uses the `io.Seeker` interface if the underlying +stream implements it. `(*fwd.Reader).Next` returns a slice pointing +to the next `n` bytes in the read buffer (like `Peek`), but also +increments the read position. This allows users to process streams +in arbitrary block sizes without having to manage appropriately-sized +slices. Additionally, obviating the need to copy the data from the +buffer to another location in memory can improve performance dramatically +in CPU-bound applications. + +`fwd.Writer` only has one extra method, which is `(*fwd.Writer).Next`, which +returns a slice pointing to the next `n` bytes of the writer, and increments +the write position by the length of the returned slice. This allows users +to write directly to the end of the buffer. + + + + +## Constants +``` go +const ( + // DefaultReaderSize is the default size of the read buffer + DefaultReaderSize = 2048 +) +``` +``` go +const ( + // DefaultWriterSize is the + // default write buffer size. + DefaultWriterSize = 2048 +) +``` + + + +## type Reader +``` go +type Reader struct { + // contains filtered or unexported fields +} +``` +Reader is a buffered look-ahead reader + + + + + + + + + +### func NewReader +``` go +func NewReader(r io.Reader) *Reader +``` +NewReader returns a new *Reader that reads from 'r' + + +### func NewReaderSize +``` go +func NewReaderSize(r io.Reader, n int) *Reader +``` +NewReaderSize returns a new *Reader that +reads from 'r' and has a buffer size 'n' + + + + +### func (\*Reader) BufferSize +``` go +func (r *Reader) BufferSize() int +``` +BufferSize returns the total size of the buffer + + + +### func (\*Reader) Buffered +``` go +func (r *Reader) Buffered() int +``` +Buffered returns the number of bytes currently in the buffer + + + +### func (\*Reader) Next +``` go +func (r *Reader) Next(n int) ([]byte, error) +``` +Next returns the next 'n' bytes in the stream. +Unlike Peek, Next advances the reader position. +The returned bytes point to the same +data as the buffer, so the slice is +only valid until the next reader method call. +An EOF is considered an unexpected error. +If an the returned slice is less than the +length asked for, an error will be returned, +and the reader position will not be incremented. + + + +### func (\*Reader) Peek +``` go +func (r *Reader) Peek(n int) ([]byte, error) +``` +Peek returns the next 'n' buffered bytes, +reading from the underlying reader if necessary. +It will only return a slice shorter than 'n' bytes +if it also returns an error. Peek does not advance +the reader. EOF errors are *not* returned as +io.ErrUnexpectedEOF. + + + +### func (\*Reader) Read +``` go +func (r *Reader) Read(b []byte) (int, error) +``` +Read implements `io.Reader` + + + +### func (\*Reader) ReadByte +``` go +func (r *Reader) ReadByte() (byte, error) +``` +ReadByte implements `io.ByteReader` + + + +### func (\*Reader) ReadFull +``` go +func (r *Reader) ReadFull(b []byte) (int, error) +``` +ReadFull attempts to read len(b) bytes into +'b'. It returns the number of bytes read into +'b', and an error if it does not return len(b). +EOF is considered an unexpected error. + + + +### func (\*Reader) Reset +``` go +func (r *Reader) Reset(rd io.Reader) +``` +Reset resets the underlying reader +and the read buffer. + + + +### func (\*Reader) Skip +``` go +func (r *Reader) Skip(n int) (int, error) +``` +Skip moves the reader forward 'n' bytes. +Returns the number of bytes skipped and any +errors encountered. It is analogous to Seek(n, 1). +If the underlying reader implements io.Seeker, then +that method will be used to skip forward. + +If the reader encounters +an EOF before skipping 'n' bytes, it +returns io.ErrUnexpectedEOF. If the +underlying reader implements io.Seeker, then +those rules apply instead. (Many implementations +will not return `io.EOF` until the next call +to Read.) + + + +### func (\*Reader) WriteTo +``` go +func (r *Reader) WriteTo(w io.Writer) (int64, error) +``` +WriteTo implements `io.WriterTo` + + + +## type Writer +``` go +type Writer struct { + // contains filtered or unexported fields +} +``` +Writer is a buffered writer + + + + + + + + + +### func NewWriter +``` go +func NewWriter(w io.Writer) *Writer +``` +NewWriter returns a new writer +that writes to 'w' and has a buffer +that is `DefaultWriterSize` bytes. + + +### func NewWriterSize +``` go +func NewWriterSize(w io.Writer, size int) *Writer +``` +NewWriterSize returns a new writer +that writes to 'w' and has a buffer +that is 'size' bytes. + + + + +### func (\*Writer) BufferSize +``` go +func (w *Writer) BufferSize() int +``` +BufferSize returns the maximum size of the buffer. + + + +### func (\*Writer) Buffered +``` go +func (w *Writer) Buffered() int +``` +Buffered returns the number of buffered bytes +in the reader. + + + +### func (\*Writer) Flush +``` go +func (w *Writer) Flush() error +``` +Flush flushes any buffered bytes +to the underlying writer. + + + +### func (\*Writer) Next +``` go +func (w *Writer) Next(n int) ([]byte, error) +``` +Next returns the next 'n' free bytes +in the write buffer, flushing the writer +as necessary. Next will return `io.ErrShortBuffer` +if 'n' is greater than the size of the write buffer. +Calls to 'next' increment the write position by +the size of the returned buffer. + + + +### func (\*Writer) ReadFrom +``` go +func (w *Writer) ReadFrom(r io.Reader) (int64, error) +``` +ReadFrom implements `io.ReaderFrom` + + + +### func (\*Writer) Write +``` go +func (w *Writer) Write(p []byte) (int, error) +``` +Write implements `io.Writer` + + + +### func (\*Writer) WriteByte +``` go +func (w *Writer) WriteByte(b byte) error +``` +WriteByte implements `io.ByteWriter` + + + +### func (\*Writer) WriteString +``` go +func (w *Writer) WriteString(s string) (int, error) +``` +WriteString is analogous to Write, but it takes a string. + + + + + + + + + +- - - +Generated by [godoc2md](http://godoc.org/github.com/davecheney/godoc2md)
\ No newline at end of file diff --git a/vendor/github.com/philhofer/fwd/reader.go b/vendor/github.com/philhofer/fwd/reader.go new file mode 100644 index 00000000..75be62ab --- /dev/null +++ b/vendor/github.com/philhofer/fwd/reader.go @@ -0,0 +1,383 @@ +// The `fwd` package provides a buffered reader +// and writer. Each has methods that help improve +// the encoding/decoding performance of some binary +// protocols. +// +// The `fwd.Writer` and `fwd.Reader` type provide similar +// functionality to their counterparts in `bufio`, plus +// a few extra utility methods that simplify read-ahead +// and write-ahead. I wrote this package to improve serialization +// performance for http://github.com/tinylib/msgp, +// where it provided about a 2x speedup over `bufio` for certain +// workloads. However, care must be taken to understand the semantics of the +// extra methods provided by this package, as they allow +// the user to access and manipulate the buffer memory +// directly. +// +// The extra methods for `fwd.Reader` are `Peek`, `Skip` +// and `Next`. `(*fwd.Reader).Peek`, unlike `(*bufio.Reader).Peek`, +// will re-allocate the read buffer in order to accommodate arbitrarily +// large read-ahead. `(*fwd.Reader).Skip` skips the next `n` bytes +// in the stream, and uses the `io.Seeker` interface if the underlying +// stream implements it. `(*fwd.Reader).Next` returns a slice pointing +// to the next `n` bytes in the read buffer (like `Peek`), but also +// increments the read position. This allows users to process streams +// in arbitrary block sizes without having to manage appropriately-sized +// slices. Additionally, obviating the need to copy the data from the +// buffer to another location in memory can improve performance dramatically +// in CPU-bound applications. +// +// `fwd.Writer` only has one extra method, which is `(*fwd.Writer).Next`, which +// returns a slice pointing to the next `n` bytes of the writer, and increments +// the write position by the length of the returned slice. This allows users +// to write directly to the end of the buffer. +// +package fwd + +import "io" + +const ( + // DefaultReaderSize is the default size of the read buffer + DefaultReaderSize = 2048 + + // minimum read buffer; straight from bufio + minReaderSize = 16 +) + +// NewReader returns a new *Reader that reads from 'r' +func NewReader(r io.Reader) *Reader { + return NewReaderSize(r, DefaultReaderSize) +} + +// NewReaderSize returns a new *Reader that +// reads from 'r' and has a buffer size 'n' +func NewReaderSize(r io.Reader, n int) *Reader { + rd := &Reader{ + r: r, + data: make([]byte, 0, max(minReaderSize, n)), + } + if s, ok := r.(io.Seeker); ok { + rd.rs = s + } + return rd +} + +// Reader is a buffered look-ahead reader +type Reader struct { + r io.Reader // underlying reader + + // data[n:len(data)] is buffered data; data[len(data):cap(data)] is free buffer space + data []byte // data + n int // read offset + state error // last read error + + // if the reader past to NewReader was + // also an io.Seeker, this is non-nil + rs io.Seeker +} + +// Reset resets the underlying reader +// and the read buffer. +func (r *Reader) Reset(rd io.Reader) { + r.r = rd + r.data = r.data[0:0] + r.n = 0 + r.state = nil + if s, ok := rd.(io.Seeker); ok { + r.rs = s + } else { + r.rs = nil + } +} + +// more() does one read on the underlying reader +func (r *Reader) more() { + // move data backwards so that + // the read offset is 0; this way + // we can supply the maximum number of + // bytes to the reader + if r.n != 0 { + if r.n < len(r.data) { + r.data = r.data[:copy(r.data[0:], r.data[r.n:])] + } else { + r.data = r.data[:0] + } + r.n = 0 + } + var a int + a, r.state = r.r.Read(r.data[len(r.data):cap(r.data)]) + if a == 0 && r.state == nil { + r.state = io.ErrNoProgress + return + } else if a > 0 && r.state == io.EOF { + // discard the io.EOF if we read more than 0 bytes. + // the next call to Read should return io.EOF again. + r.state = nil + } + r.data = r.data[:len(r.data)+a] +} + +// pop error +func (r *Reader) err() (e error) { + e, r.state = r.state, nil + return +} + +// pop error; EOF -> io.ErrUnexpectedEOF +func (r *Reader) noEOF() (e error) { + e, r.state = r.state, nil + if e == io.EOF { + e = io.ErrUnexpectedEOF + } + return +} + +// buffered bytes +func (r *Reader) buffered() int { return len(r.data) - r.n } + +// Buffered returns the number of bytes currently in the buffer +func (r *Reader) Buffered() int { return len(r.data) - r.n } + +// BufferSize returns the total size of the buffer +func (r *Reader) BufferSize() int { return cap(r.data) } + +// Peek returns the next 'n' buffered bytes, +// reading from the underlying reader if necessary. +// It will only return a slice shorter than 'n' bytes +// if it also returns an error. Peek does not advance +// the reader. EOF errors are *not* returned as +// io.ErrUnexpectedEOF. +func (r *Reader) Peek(n int) ([]byte, error) { + // in the degenerate case, + // we may need to realloc + // (the caller asked for more + // bytes than the size of the buffer) + if cap(r.data) < n { + old := r.data[r.n:] + r.data = make([]byte, n+r.buffered()) + r.data = r.data[:copy(r.data, old)] + r.n = 0 + } + + // keep filling until + // we hit an error or + // read enough bytes + for r.buffered() < n && r.state == nil { + r.more() + } + + // we must have hit an error + if r.buffered() < n { + return r.data[r.n:], r.err() + } + + return r.data[r.n : r.n+n], nil +} + +// Skip moves the reader forward 'n' bytes. +// Returns the number of bytes skipped and any +// errors encountered. It is analogous to Seek(n, 1). +// If the underlying reader implements io.Seeker, then +// that method will be used to skip forward. +// +// If the reader encounters +// an EOF before skipping 'n' bytes, it +// returns io.ErrUnexpectedEOF. If the +// underlying reader implements io.Seeker, then +// those rules apply instead. (Many implementations +// will not return `io.EOF` until the next call +// to Read.) +func (r *Reader) Skip(n int) (int, error) { + + // fast path + if r.buffered() >= n { + r.n += n + return n, nil + } + + // use seeker implementation + // if we can + if r.rs != nil { + return r.skipSeek(n) + } + + // loop on filling + // and then erasing + o := n + for r.buffered() < n && r.state == nil { + r.more() + // we can skip forward + // up to r.buffered() bytes + step := min(r.buffered(), n) + r.n += step + n -= step + } + // at this point, n should be + // 0 if everything went smoothly + return o - n, r.noEOF() +} + +// Next returns the next 'n' bytes in the stream. +// Unlike Peek, Next advances the reader position. +// The returned bytes point to the same +// data as the buffer, so the slice is +// only valid until the next reader method call. +// An EOF is considered an unexpected error. +// If an the returned slice is less than the +// length asked for, an error will be returned, +// and the reader position will not be incremented. +func (r *Reader) Next(n int) ([]byte, error) { + + // in case the buffer is too small + if cap(r.data) < n { + old := r.data[r.n:] + r.data = make([]byte, n+r.buffered()) + r.data = r.data[:copy(r.data, old)] + r.n = 0 + } + + // fill at least 'n' bytes + for r.buffered() < n && r.state == nil { + r.more() + } + + if r.buffered() < n { + return r.data[r.n:], r.noEOF() + } + out := r.data[r.n : r.n+n] + r.n += n + return out, nil +} + +// skipSeek uses the io.Seeker to seek forward. +// only call this function when n > r.buffered() +func (r *Reader) skipSeek(n int) (int, error) { + o := r.buffered() + // first, clear buffer + n -= o + r.n = 0 + r.data = r.data[:0] + + // then seek forward remaning bytes + i, err := r.rs.Seek(int64(n), 1) + return int(i) + o, err +} + +// Read implements `io.Reader` +func (r *Reader) Read(b []byte) (int, error) { + // if we have data in the buffer, just + // return that. + if r.buffered() != 0 { + x := copy(b, r.data[r.n:]) + r.n += x + return x, nil + } + var n int + // we have no buffered data; determine + // whether or not to buffer or call + // the underlying reader directly + if len(b) >= cap(r.data) { + n, r.state = r.r.Read(b) + } else { + r.more() + n = copy(b, r.data) + r.n = n + } + if n == 0 { + return 0, r.err() + } + return n, nil +} + +// ReadFull attempts to read len(b) bytes into +// 'b'. It returns the number of bytes read into +// 'b', and an error if it does not return len(b). +// EOF is considered an unexpected error. +func (r *Reader) ReadFull(b []byte) (int, error) { + var n int // read into b + var nn int // scratch + l := len(b) + // either read buffered data, + // or read directly for the underlying + // buffer, or fetch more buffered data. + for n < l && r.state == nil { + if r.buffered() != 0 { + nn = copy(b[n:], r.data[r.n:]) + n += nn + r.n += nn + } else if l-n > cap(r.data) { + nn, r.state = r.r.Read(b[n:]) + n += nn + } else { + r.more() + } + } + if n < l { + return n, r.noEOF() + } + return n, nil +} + +// ReadByte implements `io.ByteReader` +func (r *Reader) ReadByte() (byte, error) { + for r.buffered() < 1 && r.state == nil { + r.more() + } + if r.buffered() < 1 { + return 0, r.err() + } + b := r.data[r.n] + r.n++ + return b, nil +} + +// WriteTo implements `io.WriterTo` +func (r *Reader) WriteTo(w io.Writer) (int64, error) { + var ( + i int64 + ii int + err error + ) + // first, clear buffer + if r.buffered() > 0 { + ii, err = w.Write(r.data[r.n:]) + i += int64(ii) + if err != nil { + return i, err + } + r.data = r.data[0:0] + r.n = 0 + } + for r.state == nil { + // here we just do + // 1:1 reads and writes + r.more() + if r.buffered() > 0 { + ii, err = w.Write(r.data) + i += int64(ii) + if err != nil { + return i, err + } + r.data = r.data[0:0] + r.n = 0 + } + } + if r.state != io.EOF { + return i, r.err() + } + return i, nil +} + +func min(a int, b int) int { + if a < b { + return a + } + return b +} + +func max(a int, b int) int { + if a < b { + return b + } + return a +} diff --git a/vendor/github.com/philhofer/fwd/writer.go b/vendor/github.com/philhofer/fwd/writer.go new file mode 100644 index 00000000..2dc392a9 --- /dev/null +++ b/vendor/github.com/philhofer/fwd/writer.go @@ -0,0 +1,224 @@ +package fwd + +import "io" + +const ( + // DefaultWriterSize is the + // default write buffer size. + DefaultWriterSize = 2048 + + minWriterSize = minReaderSize +) + +// Writer is a buffered writer +type Writer struct { + w io.Writer // writer + buf []byte // 0:len(buf) is bufered data +} + +// NewWriter returns a new writer +// that writes to 'w' and has a buffer +// that is `DefaultWriterSize` bytes. +func NewWriter(w io.Writer) *Writer { + if wr, ok := w.(*Writer); ok { + return wr + } + return &Writer{ + w: w, + buf: make([]byte, 0, DefaultWriterSize), + } +} + +// NewWriterSize returns a new writer +// that writes to 'w' and has a buffer +// that is 'size' bytes. +func NewWriterSize(w io.Writer, size int) *Writer { + if wr, ok := w.(*Writer); ok && cap(wr.buf) >= size { + return wr + } + return &Writer{ + w: w, + buf: make([]byte, 0, max(size, minWriterSize)), + } +} + +// Buffered returns the number of buffered bytes +// in the reader. +func (w *Writer) Buffered() int { return len(w.buf) } + +// BufferSize returns the maximum size of the buffer. +func (w *Writer) BufferSize() int { return cap(w.buf) } + +// Flush flushes any buffered bytes +// to the underlying writer. +func (w *Writer) Flush() error { + l := len(w.buf) + if l > 0 { + n, err := w.w.Write(w.buf) + + // if we didn't write the whole + // thing, copy the unwritten + // bytes to the beginnning of the + // buffer. + if n < l && n > 0 { + w.pushback(n) + if err == nil { + err = io.ErrShortWrite + } + } + if err != nil { + return err + } + w.buf = w.buf[:0] + return nil + } + return nil +} + +// Write implements `io.Writer` +func (w *Writer) Write(p []byte) (int, error) { + c, l, ln := cap(w.buf), len(w.buf), len(p) + avail := c - l + + // requires flush + if avail < ln { + if err := w.Flush(); err != nil { + return 0, err + } + l = len(w.buf) + } + // too big to fit in buffer; + // write directly to w.w + if c < ln { + return w.w.Write(p) + } + + // grow buf slice; copy; return + w.buf = w.buf[:l+ln] + return copy(w.buf[l:], p), nil +} + +// WriteString is analogous to Write, but it takes a string. +func (w *Writer) WriteString(s string) (int, error) { + c, l, ln := cap(w.buf), len(w.buf), len(s) + avail := c - l + + // requires flush + if avail < ln { + if err := w.Flush(); err != nil { + return 0, err + } + l = len(w.buf) + } + // too big to fit in buffer; + // write directly to w.w + // + // yes, this is unsafe. *but* + // io.Writer is not allowed + // to mutate its input or + // maintain a reference to it, + // per the spec in package io. + // + // plus, if the string is really + // too big to fit in the buffer, then + // creating a copy to write it is + // expensive (and, strictly speaking, + // unnecessary) + if c < ln { + return w.w.Write(unsafestr(s)) + } + + // grow buf slice; copy; return + w.buf = w.buf[:l+ln] + return copy(w.buf[l:], s), nil +} + +// WriteByte implements `io.ByteWriter` +func (w *Writer) WriteByte(b byte) error { + if len(w.buf) == cap(w.buf) { + if err := w.Flush(); err != nil { + return err + } + } + w.buf = append(w.buf, b) + return nil +} + +// Next returns the next 'n' free bytes +// in the write buffer, flushing the writer +// as necessary. Next will return `io.ErrShortBuffer` +// if 'n' is greater than the size of the write buffer. +// Calls to 'next' increment the write position by +// the size of the returned buffer. +func (w *Writer) Next(n int) ([]byte, error) { + c, l := cap(w.buf), len(w.buf) + if n > c { + return nil, io.ErrShortBuffer + } + avail := c - l + if avail < n { + if err := w.Flush(); err != nil { + return nil, err + } + l = len(w.buf) + } + w.buf = w.buf[:l+n] + return w.buf[l:], nil +} + +// take the bytes from w.buf[n:len(w.buf)] +// and put them at the beginning of w.buf, +// and resize to the length of the copied segment. +func (w *Writer) pushback(n int) { + w.buf = w.buf[:copy(w.buf, w.buf[n:])] +} + +// ReadFrom implements `io.ReaderFrom` +func (w *Writer) ReadFrom(r io.Reader) (int64, error) { + // anticipatory flush + if err := w.Flush(); err != nil { + return 0, err + } + + w.buf = w.buf[0:cap(w.buf)] // expand buffer + + var nn int64 // written + var err error // error + var x int // read + + // 1:1 reads and writes + for err == nil { + x, err = r.Read(w.buf) + if x > 0 { + n, werr := w.w.Write(w.buf[:x]) + nn += int64(n) + + if err != nil { + if n < x && n > 0 { + w.pushback(n - x) + } + return nn, werr + } + if n < x { + w.pushback(n - x) + return nn, io.ErrShortWrite + } + } else if err == nil { + err = io.ErrNoProgress + break + } + } + if err != io.EOF { + return nn, err + } + + // we only clear here + // because we are sure + // the writes have + // succeeded. otherwise, + // we retain the data in case + // future writes succeed. + w.buf = w.buf[0:0] + + return nn, nil +} diff --git a/vendor/github.com/philhofer/fwd/writer_appengine.go b/vendor/github.com/philhofer/fwd/writer_appengine.go new file mode 100644 index 00000000..e367f393 --- /dev/null +++ b/vendor/github.com/philhofer/fwd/writer_appengine.go @@ -0,0 +1,5 @@ +// +build appengine + +package fwd + +func unsafestr(s string) []byte { return []byte(s) } diff --git a/vendor/github.com/philhofer/fwd/writer_unsafe.go b/vendor/github.com/philhofer/fwd/writer_unsafe.go new file mode 100644 index 00000000..a0bf453b --- /dev/null +++ b/vendor/github.com/philhofer/fwd/writer_unsafe.go @@ -0,0 +1,18 @@ +// +build !appengine + +package fwd + +import ( + "reflect" + "unsafe" +) + +// unsafe cast string as []byte +func unsafestr(b string) []byte { + l := len(b) + return *(*[]byte)(unsafe.Pointer(&reflect.SliceHeader{ + Len: l, + Cap: l, + Data: (*reflect.StringHeader)(unsafe.Pointer(&b)).Data, + })) +} |