120 lines
3.0 KiB
Go
120 lines
3.0 KiB
Go
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// Protocol Buffers for Go with Gadgets
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//
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// Copyright (c) 2013, The GoGo Authors. All rights reserved.
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// http://github.com/gogo/protobuf
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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package proto
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import (
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"fmt"
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"io"
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)
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func Skip(data []byte) (n int, err error) {
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l := len(data)
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index := 0
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for index < l {
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var wire uint64
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for shift := uint(0); ; shift += 7 {
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if index >= l {
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return 0, io.ErrUnexpectedEOF
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}
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b := data[index]
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index++
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wire |= (uint64(b) & 0x7F) << shift
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if b < 0x80 {
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break
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}
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}
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wireType := int(wire & 0x7)
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switch wireType {
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case 0:
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for {
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if index >= l {
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return 0, io.ErrUnexpectedEOF
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}
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index++
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if data[index-1] < 0x80 {
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break
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}
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}
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return index, nil
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case 1:
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index += 8
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return index, nil
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case 2:
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var length int
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for shift := uint(0); ; shift += 7 {
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if index >= l {
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return 0, io.ErrUnexpectedEOF
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}
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b := data[index]
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index++
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length |= (int(b) & 0x7F) << shift
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if b < 0x80 {
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break
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}
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}
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index += length
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return index, nil
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case 3:
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for {
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var innerWire uint64
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var start int = index
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for shift := uint(0); ; shift += 7 {
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if index >= l {
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return 0, io.ErrUnexpectedEOF
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}
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b := data[index]
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index++
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innerWire |= (uint64(b) & 0x7F) << shift
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if b < 0x80 {
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break
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}
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}
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innerWireType := int(innerWire & 0x7)
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if innerWireType == 4 {
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break
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}
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next, err := Skip(data[start:])
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if err != nil {
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return 0, err
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}
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index = start + next
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}
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return index, nil
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case 4:
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return index, nil
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case 5:
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index += 4
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return index, nil
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default:
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return 0, fmt.Errorf("proto: illegal wireType %d", wireType)
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}
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}
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panic("unreachable")
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}
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