Documentation
¶
Overview ¶
Package protowire parses and formats the raw wire encoding. See https://developers.google.com/protocol-buffers/docs/encoding.
For marshaling and unmarshaling entire protobuf messages, use the "google.golang.org/protobuf/proto" package instead.
Index ¶
- func AppendBytes(b []byte, v []byte) []byte
- func AppendFixed32(b []byte, v uint32) []byte
- func AppendFixed64(b []byte, v uint64) []byte
- func AppendGroup(b []byte, num Number, v []byte) []byte
- func AppendString(b []byte, v string) []byte
- func AppendTag(b []byte, num Number, typ Type) []byte
- func AppendVarint(b []byte, v uint64) []byte
- func ConsumeBytes(b []byte) (v []byte, n int)
- func ConsumeField(b []byte) (Number, Type, int)
- func ConsumeFieldValue(num Number, typ Type, b []byte) (n int)
- func ConsumeFixed32(b []byte) (v uint32, n int)
- func ConsumeFixed64(b []byte) (v uint64, n int)
- func ConsumeGroup(num Number, b []byte) (v []byte, n int)
- func ConsumeString(b []byte) (v string, n int)
- func ConsumeTag(b []byte) (Number, Type, int)
- func ConsumeVarint(b []byte) (v uint64, n int)
- func DecodeBool(x uint64) bool
- func DecodeTag(x uint64) (Number, Type)
- func DecodeZigZag(x uint64) int64
- func EncodeBool(x bool) uint64
- func EncodeTag(num Number, typ Type) uint64
- func EncodeZigZag(x int64) uint64
- func ParseError(n int) error
- func SizeBytes(n int) int
- func SizeFixed32() int
- func SizeFixed64() int
- func SizeGroup(num Number, n int) int
- func SizeTag(num Number) int
- func SizeVarint(v uint64) int
- type Number
- type Type
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
func AppendBytes ¶
AppendBytes appends v to b as a length-prefixed bytes value.
func AppendFixed32 ¶
AppendFixed32 appends v to b as a little-endian uint32.
func AppendFixed64 ¶
AppendFixed64 appends v to b as a little-endian uint64.
func AppendGroup ¶
AppendGroup appends v to b as group value, with a trailing end group marker. The value v must not contain the end marker.
func AppendString ¶
AppendString appends v to b as a length-prefixed bytes value.
func AppendTag ¶
AppendTag encodes num and typ as a varint-encoded tag and appends it to b.
func AppendVarint ¶
AppendVarint appends v to b as a varint-encoded uint64.
func ConsumeBytes ¶
ConsumeBytes parses b as a length-prefixed bytes value, reporting its length. This returns a negative length upon an error (see ParseError).
func ConsumeField ¶
ConsumeField parses an entire field record (both tag and value) and returns the field number, the wire type, and the total length. This returns a negative length upon an error (see ParseError).
The total length includes the tag header and the end group marker (if the field is a group).
func ConsumeFieldValue ¶
ConsumeFieldValue parses a field value and returns its length. This assumes that the field Number and wire Type have already been parsed. This returns a negative length upon an error (see ParseError).
When parsing a group, the length includes the end group marker and the end group is verified to match the starting field number.
func ConsumeFixed32 ¶
ConsumeFixed32 parses b as a little-endian uint32, reporting its length. This returns a negative length upon an error (see ParseError).
func ConsumeFixed64 ¶
ConsumeFixed64 parses b as a little-endian uint64, reporting its length. This returns a negative length upon an error (see ParseError).
func ConsumeGroup ¶
ConsumeGroup parses b as a group value until the trailing end group marker, and verifies that the end marker matches the provided num. The value v does not contain the end marker, while the length does contain the end marker. This returns a negative length upon an error (see ParseError).
func ConsumeString ¶
ConsumeString parses b as a length-prefixed bytes value, reporting its length. This returns a negative length upon an error (see ParseError).
func ConsumeTag ¶
ConsumeTag parses b as a varint-encoded tag, reporting its length. This returns a negative length upon an error (see ParseError).
func ConsumeVarint ¶
ConsumeVarint parses b as a varint-encoded uint64, reporting its length. This returns a negative length upon an error (see ParseError).
func DecodeBool ¶
DecodeBool decodes a uint64 as a bool.
Input: { 0, 1, 2, …}
Output: {false, true, true, …}
func DecodeTag ¶
DecodeTag decodes the field Number and wire Type from its unified form. The Number is -1 if the decoded field number overflows int32. Other than overflow, this does not check for field number validity.
func DecodeZigZag ¶
DecodeZigZag decodes a zig-zag-encoded uint64 as an int64.
Input: {…, 5, 3, 1, 0, 2, 4, 6, …}
Output: {…, -3, -2, -1, 0, +1, +2, +3, …}
func EncodeTag ¶
EncodeTag encodes the field Number and wire Type into its unified form.
func EncodeZigZag ¶
EncodeZigZag encodes an int64 as a zig-zag-encoded uint64.
Input: {…, -3, -2, -1, 0, +1, +2, +3, …}
Output: {…, 5, 3, 1, 0, 2, 4, 6, …}
func ParseError ¶
ParseError converts an error code into an error value. This returns nil if n is a non-negative number.
func SizeBytes ¶
SizeBytes returns the encoded size of a length-prefixed bytes value, given only the length.
func SizeFixed32 ¶
func SizeFixed32() int
SizeFixed32 returns the encoded size of a fixed32; which is always 4.
func SizeFixed64 ¶
func SizeFixed64() int
SizeFixed64 returns the encoded size of a fixed64; which is always 8.
func SizeGroup ¶
SizeGroup returns the encoded size of a group, given only the length.
Types ¶
type Number ¶
type Number int32
Number represents the field number.
func (Number) IsValid ¶
IsValid reports whether the field number is semantically valid.
Note that while numbers within the reserved range are semantically invalid, they are syntactically valid in the wire format. Implementations may treat records with reserved field numbers as unknown.
Source Files