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author | Matthew Heon <matthew.heon@gmail.com> | 2017-11-01 11:24:59 -0400 |
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committer | Matthew Heon <matthew.heon@gmail.com> | 2017-11-01 11:24:59 -0400 |
commit | a031b83a09a8628435317a03f199cdc18b78262f (patch) | |
tree | bc017a96769ce6de33745b8b0b1304ccf38e9df0 /vendor/golang.org/x/net/http2/fixed_buffer.go | |
parent | 2b74391cd5281f6fdf391ff8ad50fd1490f6bf89 (diff) | |
download | podman-a031b83a09a8628435317a03f199cdc18b78262f.tar.gz podman-a031b83a09a8628435317a03f199cdc18b78262f.tar.bz2 podman-a031b83a09a8628435317a03f199cdc18b78262f.zip |
Initial checkin from CRI-O repo
Signed-off-by: Matthew Heon <matthew.heon@gmail.com>
Diffstat (limited to 'vendor/golang.org/x/net/http2/fixed_buffer.go')
-rw-r--r-- | vendor/golang.org/x/net/http2/fixed_buffer.go | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/vendor/golang.org/x/net/http2/fixed_buffer.go b/vendor/golang.org/x/net/http2/fixed_buffer.go new file mode 100644 index 000000000..47da0f0bf --- /dev/null +++ b/vendor/golang.org/x/net/http2/fixed_buffer.go @@ -0,0 +1,60 @@ +// Copyright 2014 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 http2 + +import ( + "errors" +) + +// fixedBuffer is an io.ReadWriter backed by a fixed size buffer. +// It never allocates, but moves old data as new data is written. +type fixedBuffer struct { + buf []byte + r, w int +} + +var ( + errReadEmpty = errors.New("read from empty fixedBuffer") + errWriteFull = errors.New("write on full fixedBuffer") +) + +// Read copies bytes from the buffer into p. +// It is an error to read when no data is available. +func (b *fixedBuffer) Read(p []byte) (n int, err error) { + if b.r == b.w { + return 0, errReadEmpty + } + n = copy(p, b.buf[b.r:b.w]) + b.r += n + if b.r == b.w { + b.r = 0 + b.w = 0 + } + return n, nil +} + +// Len returns the number of bytes of the unread portion of the buffer. +func (b *fixedBuffer) Len() int { + return b.w - b.r +} + +// Write copies bytes from p into the buffer. +// It is an error to write more data than the buffer can hold. +func (b *fixedBuffer) Write(p []byte) (n int, err error) { + // Slide existing data to beginning. + if b.r > 0 && len(p) > len(b.buf)-b.w { + copy(b.buf, b.buf[b.r:b.w]) + b.w -= b.r + b.r = 0 + } + + // Write new data. + n = copy(b.buf[b.w:], p) + b.w += n + if n < len(p) { + err = errWriteFull + } + return n, err +} |