51 lines
1.4 KiB
Go
51 lines
1.4 KiB
Go
package internal
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// extracted from: https://github.com/golang/protobuf/blob/v1.5.4/proto/buffer.go
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import "google.golang.org/protobuf/encoding/protowire"
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// ProtoBuffer is a buffer for encoding and decoding the protobuf wire format.
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// It may be reused between invocations to reduce memory usage.
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type ProtoBuffer struct {
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buf []byte
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idx int
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deterministic bool
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}
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// NewProtoBuffer allocates a new ProtoBuffer initialized with buf,
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// where the contents of buf are considered the unread portion of the buffer.
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func NewProtoBuffer(buf []byte) *ProtoBuffer {
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return &ProtoBuffer{buf: buf}
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}
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// DecodeStringBytes consumes a length-prefixed raw bytes from the buffer.
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// It does not validate whether the raw bytes contain valid UTF-8.
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func (b *ProtoBuffer) DecodeStringBytes() (string, error) {
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v, n := protowire.ConsumeString(b.buf[b.idx:])
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if n < 0 {
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return "", protowire.ParseError(n)
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}
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b.idx += n
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return v, nil
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}
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// DecodeRawBytes consumes a length-prefixed raw bytes from the buffer.
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// If alloc is specified, it returns a copy the raw bytes
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// rather than a sub-slice of the buffer.
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func (b *ProtoBuffer) DecodeRawBytes(alloc bool) ([]byte, error) {
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v, n := protowire.ConsumeBytes(b.buf[b.idx:])
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if n < 0 {
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return nil, protowire.ParseError(n)
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}
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b.idx += n
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if alloc {
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v = append([]byte(nil), v...)
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}
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return v, nil
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}
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// Unread returns the unread portion of the buffer.
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func (b *ProtoBuffer) Unread() []byte {
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return b.buf[b.idx:]
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}
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