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// Copyright 2018 The Go Authors. All rights reserved. |
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// Use of this source code is governed by a BSD-style |
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// license that can be found in the LICENSE file. |
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|
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// Package protowire parses and formats the raw wire encoding. |
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// See https://developers.google.com/protocol-buffers/docs/encoding. |
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// |
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// For marshaling and unmarshaling entire protobuf messages, |
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// use the "google.golang.org/protobuf/proto" package instead. |
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package protowire |
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|
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import ( |
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"io" |
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"math" |
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"math/bits" |
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|
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"google.golang.org/protobuf/internal/errors" |
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) |
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|
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// Number represents the field number. |
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type Number int32 |
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|
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const ( |
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MinValidNumber Number = 1 |
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FirstReservedNumber Number = 19000 |
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LastReservedNumber Number = 19999 |
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MaxValidNumber Number = 1<<29 - 1 |
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DefaultRecursionLimit = 10000 |
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) |
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|
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// IsValid reports whether the field number is semantically valid. |
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// |
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// Note that while numbers within the reserved range are semantically invalid, |
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// they are syntactically valid in the wire format. |
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// Implementations may treat records with reserved field numbers as unknown. |
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func (n Number) IsValid() bool { |
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return MinValidNumber <= n && n < FirstReservedNumber || LastReservedNumber < n && n <= MaxValidNumber |
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} |
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|
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// Type represents the wire type. |
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type Type int8 |
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|
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const ( |
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VarintType Type = 0 |
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Fixed32Type Type = 5 |
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Fixed64Type Type = 1 |
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BytesType Type = 2 |
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StartGroupType Type = 3 |
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EndGroupType Type = 4 |
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) |
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|
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const ( |
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_ = -iota |
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errCodeTruncated |
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errCodeFieldNumber |
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errCodeOverflow |
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errCodeReserved |
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errCodeEndGroup |
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errCodeRecursionDepth |
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) |
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var ( |
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errFieldNumber = errors.New("invalid field number") |
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errOverflow = errors.New("variable length integer overflow") |
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errReserved = errors.New("cannot parse reserved wire type") |
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errEndGroup = errors.New("mismatching end group marker") |
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errParse = errors.New("parse error") |
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) |
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// ParseError converts an error code into an error value. |
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// This returns nil if n is a non-negative number. |
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func ParseError(n int) error { |
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if n >= 0 { |
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return nil |
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} |
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switch n { |
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case errCodeTruncated: |
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return io.ErrUnexpectedEOF |
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case errCodeFieldNumber: |
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return errFieldNumber |
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case errCodeOverflow: |
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return errOverflow |
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case errCodeReserved: |
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return errReserved |
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case errCodeEndGroup: |
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return errEndGroup |
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default: |
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return errParse |
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} |
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} |
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|
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// ConsumeField parses an entire field record (both tag and value) and returns |
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// the field number, the wire type, and the total length. |
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// This returns a negative length upon an error (see ParseError). |
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// |
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// The total length includes the tag header and the end group marker (if the |
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// field is a group). |
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func ConsumeField(b []byte) (Number, Type, int) { |
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num, typ, n := ConsumeTag(b) |
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if n < 0 { |
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return 0, 0, n // forward error code |
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} |
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m := ConsumeFieldValue(num, typ, b[n:]) |
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if m < 0 { |
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return 0, 0, m // forward error code |
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} |
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return num, typ, n + m |
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} |
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// ConsumeFieldValue parses a field value and returns its length. |
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// This assumes that the field Number and wire Type have already been parsed. |
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// This returns a negative length upon an error (see ParseError). |
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// |
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// When parsing a group, the length includes the end group marker and |
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// the end group is verified to match the starting field number. |
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func ConsumeFieldValue(num Number, typ Type, b []byte) (n int) { |
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return consumeFieldValueD(num, typ, b, DefaultRecursionLimit) |
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} |
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func consumeFieldValueD(num Number, typ Type, b []byte, depth int) (n int) { |
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switch typ { |
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case VarintType: |
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_, n = ConsumeVarint(b) |
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return n |
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case Fixed32Type: |
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_, n = ConsumeFixed32(b) |
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return n |
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case Fixed64Type: |
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_, n = ConsumeFixed64(b) |
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return n |
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case BytesType: |
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_, n = ConsumeBytes(b) |
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return n |
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case StartGroupType: |
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if depth < 0 { |
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return errCodeRecursionDepth |
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} |
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n0 := len(b) |
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for { |
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num2, typ2, n := ConsumeTag(b) |
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if n < 0 { |
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return n // forward error code |
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} |
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b = b[n:] |
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if typ2 == EndGroupType { |
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if num != num2 { |
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return errCodeEndGroup |
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} |
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return n0 - len(b) |
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} |
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n = consumeFieldValueD(num2, typ2, b, depth-1) |
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if n < 0 { |
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return n // forward error code |
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} |
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b = b[n:] |
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} |
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case EndGroupType: |
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return errCodeEndGroup |
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default: |
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return errCodeReserved |
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} |
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} |
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// AppendTag encodes num and typ as a varint-encoded tag and appends it to b. |
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func AppendTag(b []byte, num Number, typ Type) []byte { |
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return AppendVarint(b, EncodeTag(num, typ)) |
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} |
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// ConsumeTag parses b as a varint-encoded tag, reporting its length. |
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// This returns a negative length upon an error (see ParseError). |
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func ConsumeTag(b []byte) (Number, Type, int) { |
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v, n := ConsumeVarint(b) |
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if n < 0 { |
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return 0, 0, n // forward error code |
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} |
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num, typ := DecodeTag(v) |
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if num < MinValidNumber { |
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return 0, 0, errCodeFieldNumber |
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} |
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return num, typ, n |
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} |
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func SizeTag(num Number) int { |
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return SizeVarint(EncodeTag(num, 0)) // wire type has no effect on size |
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} |
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// AppendVarint appends v to b as a varint-encoded uint64. |
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func AppendVarint(b []byte, v uint64) []byte { |
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switch { |
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case v < 1<<7: |
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b = append(b, byte(v)) |
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case v < 1<<14: |
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b = append(b, |
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byte((v>>0)&0x7f|0x80), |
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byte(v>>7)) |
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case v < 1<<21: |
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b = append(b, |
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byte((v>>0)&0x7f|0x80), |
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byte((v>>7)&0x7f|0x80), |
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byte(v>>14)) |
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case v < 1<<28: |
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b = append(b, |
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byte((v>>0)&0x7f|0x80), |
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byte((v>>7)&0x7f|0x80), |
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byte((v>>14)&0x7f|0x80), |
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byte(v>>21)) |
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case v < 1<<35: |
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b = append(b, |
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byte((v>>0)&0x7f|0x80), |
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byte((v>>7)&0x7f|0x80), |
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byte((v>>14)&0x7f|0x80), |
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byte((v>>21)&0x7f|0x80), |
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byte(v>>28)) |
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case v < 1<<42: |
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b = append(b, |
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byte((v>>0)&0x7f|0x80), |
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byte((v>>7)&0x7f|0x80), |
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byte((v>>14)&0x7f|0x80), |
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byte((v>>21)&0x7f|0x80), |
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byte((v>>28)&0x7f|0x80), |
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byte(v>>35)) |
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case v < 1<<49: |
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b = append(b, |
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byte((v>>0)&0x7f|0x80), |
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byte((v>>7)&0x7f|0x80), |
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byte((v>>14)&0x7f|0x80), |
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byte((v>>21)&0x7f|0x80), |
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byte((v>>28)&0x7f|0x80), |
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byte((v>>35)&0x7f|0x80), |
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byte(v>>42)) |
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case v < 1<<56: |
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b = append(b, |
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byte((v>>0)&0x7f|0x80), |
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byte((v>>7)&0x7f|0x80), |
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byte((v>>14)&0x7f|0x80), |
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byte((v>>21)&0x7f|0x80), |
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byte((v>>28)&0x7f|0x80), |
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byte((v>>35)&0x7f|0x80), |
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byte((v>>42)&0x7f|0x80), |
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byte(v>>49)) |
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case v < 1<<63: |
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b = append(b, |
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byte((v>>0)&0x7f|0x80), |
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byte((v>>7)&0x7f|0x80), |
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byte((v>>14)&0x7f|0x80), |
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byte((v>>21)&0x7f|0x80), |
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byte((v>>28)&0x7f|0x80), |
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byte((v>>35)&0x7f|0x80), |
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byte((v>>42)&0x7f|0x80), |
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byte((v>>49)&0x7f|0x80), |
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byte(v>>56)) |
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default: |
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b = append(b, |
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byte((v>>0)&0x7f|0x80), |
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byte((v>>7)&0x7f|0x80), |
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byte((v>>14)&0x7f|0x80), |
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byte((v>>21)&0x7f|0x80), |
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byte((v>>28)&0x7f|0x80), |
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byte((v>>35)&0x7f|0x80), |
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byte((v>>42)&0x7f|0x80), |
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byte((v>>49)&0x7f|0x80), |
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byte((v>>56)&0x7f|0x80), |
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1) |
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} |
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return b |
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} |
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// ConsumeVarint parses b as a varint-encoded uint64, reporting its length. |
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// This returns a negative length upon an error (see ParseError). |
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func ConsumeVarint(b []byte) (v uint64, n int) { |
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var y uint64 |
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if len(b) <= 0 { |
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return 0, errCodeTruncated |
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} |
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v = uint64(b[0]) |
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if v < 0x80 { |
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return v, 1 |
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} |
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v -= 0x80 |
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if len(b) <= 1 { |
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return 0, errCodeTruncated |
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} |
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y = uint64(b[1]) |
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v += y << 7 |
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if y < 0x80 { |
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return v, 2 |
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} |
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v -= 0x80 << 7 |
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if len(b) <= 2 { |
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return 0, errCodeTruncated |
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} |
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y = uint64(b[2]) |
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v += y << 14 |
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if y < 0x80 { |
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return v, 3 |
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} |
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v -= 0x80 << 14 |
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if len(b) <= 3 { |
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return 0, errCodeTruncated |
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} |
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y = uint64(b[3]) |
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v += y << 21 |
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if y < 0x80 { |
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return v, 4 |
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} |
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v -= 0x80 << 21 |
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if len(b) <= 4 { |
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return 0, errCodeTruncated |
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} |
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y = uint64(b[4]) |
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v += y << 28 |
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if y < 0x80 { |
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return v, 5 |
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} |
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v -= 0x80 << 28 |
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if len(b) <= 5 { |
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return 0, errCodeTruncated |
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} |
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y = uint64(b[5]) |
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v += y << 35 |
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if y < 0x80 { |
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return v, 6 |
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} |
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v -= 0x80 << 35 |
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if len(b) <= 6 { |
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return 0, errCodeTruncated |
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} |
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y = uint64(b[6]) |
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v += y << 42 |
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if y < 0x80 { |
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return v, 7 |
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} |
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v -= 0x80 << 42 |
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if len(b) <= 7 { |
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return 0, errCodeTruncated |
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} |
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y = uint64(b[7]) |
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v += y << 49 |
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if y < 0x80 { |
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return v, 8 |
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} |
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v -= 0x80 << 49 |
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if len(b) <= 8 { |
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return 0, errCodeTruncated |
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} |
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y = uint64(b[8]) |
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v += y << 56 |
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if y < 0x80 { |
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return v, 9 |
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} |
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v -= 0x80 << 56 |
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if len(b) <= 9 { |
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return 0, errCodeTruncated |
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} |
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y = uint64(b[9]) |
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v += y << 63 |
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if y < 2 { |
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return v, 10 |
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} |
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return 0, errCodeOverflow |
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} |
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// SizeVarint returns the encoded size of a varint. |
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// The size is guaranteed to be within 1 and 10, inclusive. |
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func SizeVarint(v uint64) int { |
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// This computes 1 + (bits.Len64(v)-1)/7. |
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// 9/64 is a good enough approximation of 1/7 |
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return int(9*uint32(bits.Len64(v))+64) / 64 |
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} |
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|
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// AppendFixed32 appends v to b as a little-endian uint32. |
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func AppendFixed32(b []byte, v uint32) []byte { |
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return append(b, |
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byte(v>>0), |
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byte(v>>8), |
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byte(v>>16), |
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byte(v>>24)) |
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} |
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// ConsumeFixed32 parses b as a little-endian uint32, reporting its length. |
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// This returns a negative length upon an error (see ParseError). |
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func ConsumeFixed32(b []byte) (v uint32, n int) { |
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if len(b) < 4 { |
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return 0, errCodeTruncated |
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} |
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v = uint32(b[0])<<0 | uint32(b[1])<<8 | uint32(b[2])<<16 | uint32(b[3])<<24 |
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return v, 4 |
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} |
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|
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// SizeFixed32 returns the encoded size of a fixed32; which is always 4. |
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func SizeFixed32() int { |
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return 4 |
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} |
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|
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// AppendFixed64 appends v to b as a little-endian uint64. |
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func AppendFixed64(b []byte, v uint64) []byte { |
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return append(b, |
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byte(v>>0), |
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byte(v>>8), |
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byte(v>>16), |
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byte(v>>24), |
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byte(v>>32), |
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byte(v>>40), |
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byte(v>>48), |
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byte(v>>56)) |
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} |
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|
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// ConsumeFixed64 parses b as a little-endian uint64, reporting its length. |
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419 |
// This returns a negative length upon an error (see ParseError). |
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func ConsumeFixed64(b []byte) (v uint64, n int) { |
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421 |
if len(b) < 8 { |
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return 0, errCodeTruncated |
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} |
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v = uint64(b[0])<<0 | uint64(b[1])<<8 | uint64(b[2])<<16 | uint64(b[3])<<24 | uint64(b[4])<<32 | uint64(b[5])<<40 | uint64(b[6])<<48 | uint64(b[7])<<56 |
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return v, 8 |
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} |
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|
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// SizeFixed64 returns the encoded size of a fixed64; which is always 8. |
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429 |
func SizeFixed64() int { |
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return 8 |
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} |
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|
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// AppendBytes appends v to b as a length-prefixed bytes value. |
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434 |
func AppendBytes(b []byte, v []byte) []byte { |
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435 |
return append(AppendVarint(b, uint64(len(v))), v...) |
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} |
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|
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// ConsumeBytes parses b as a length-prefixed bytes value, reporting its length. |
|
439 |
// This returns a negative length upon an error (see ParseError). |
|
440 |
func ConsumeBytes(b []byte) (v []byte, n int) { |
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441 |
m, n := ConsumeVarint(b) |
|
442 |
if n < 0 { |
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return nil, n // forward error code |
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} |
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445 |
if m > uint64(len(b[n:])) { |
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446 |
return nil, errCodeTruncated |
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447 |
} |
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448 |
return b[n:][:m], n + int(m) |
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449 |
} |
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450 |
|
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451 |
// SizeBytes returns the encoded size of a length-prefixed bytes value, |
|
452 |
// given only the length. |
|
453 |
func SizeBytes(n int) int { |
|
454 |
return SizeVarint(uint64(n)) + n |
|
455 |
} |
|
456 |
|
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457 |
// AppendString appends v to b as a length-prefixed bytes value. |
|
458 |
func AppendString(b []byte, v string) []byte { |
|
459 |
return append(AppendVarint(b, uint64(len(v))), v...) |
|
460 |
} |
|
461 |
|
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462 |
// ConsumeString parses b as a length-prefixed bytes value, reporting its length. |
|
463 |
// This returns a negative length upon an error (see ParseError). |
|
464 |
func ConsumeString(b []byte) (v string, n int) { |
|
465 |
bb, n := ConsumeBytes(b) |
|
466 |
return string(bb), n |
|
467 |
} |
|
468 |
|
|
469 |
// AppendGroup appends v to b as group value, with a trailing end group marker. |
|
470 |
// The value v must not contain the end marker. |
|
471 |
func AppendGroup(b []byte, num Number, v []byte) []byte { |
|
472 |
return AppendVarint(append(b, v...), EncodeTag(num, EndGroupType)) |
|
473 |
} |
|
474 |
|
|
475 |
// ConsumeGroup parses b as a group value until the trailing end group marker, |
|
476 |
// and verifies that the end marker matches the provided num. The value v |
|
477 |
// does not contain the end marker, while the length does contain the end marker. |
|
478 |
// This returns a negative length upon an error (see ParseError). |
|
479 |
func ConsumeGroup(num Number, b []byte) (v []byte, n int) { |
|
480 |
n = ConsumeFieldValue(num, StartGroupType, b) |
|
481 |
if n < 0 { |
|
482 |
return nil, n // forward error code |
|
483 |
} |
|
484 |
b = b[:n] |
|
485 |
|
|
486 |
// Truncate off end group marker, but need to handle denormalized varints. |
|
487 |
// Assuming end marker is never 0 (which is always the case since |
|
488 |
// EndGroupType is non-zero), we can truncate all trailing bytes where the |
|
489 |
// lower 7 bits are all zero (implying that the varint is denormalized). |
|
490 |
for len(b) > 0 && b[len(b)-1]&0x7f == 0 { |
|
491 |
b = b[:len(b)-1] |
|
492 |
} |
|
493 |
b = b[:len(b)-SizeTag(num)] |
|
494 |
return b, n |
|
495 |
} |
|
496 |
|
|
497 |
// SizeGroup returns the encoded size of a group, given only the length. |
|
498 |
func SizeGroup(num Number, n int) int { |
|
499 |
return n + SizeTag(num) |
|
500 |
} |
|
501 |
|
|
502 |
// DecodeTag decodes the field Number and wire Type from its unified form. |
|
503 |
// The Number is -1 if the decoded field number overflows int32. |
|
504 |
// Other than overflow, this does not check for field number validity. |
|
505 |
func DecodeTag(x uint64) (Number, Type) { |
|
506 |
// NOTE: MessageSet allows for larger field numbers than normal. |
|
507 |
if x>>3 > uint64(math.MaxInt32) { |
|
508 |
return -1, 0 |
|
509 |
} |
|
510 |
return Number(x >> 3), Type(x & 7) |
|
511 |
} |
|
512 |
|
|
513 |
// EncodeTag encodes the field Number and wire Type into its unified form. |
|
514 |
func EncodeTag(num Number, typ Type) uint64 { |
|
515 |
return uint64(num)<<3 | uint64(typ&7) |
|
516 |
} |
|
517 |
|
|
518 |
// DecodeZigZag decodes a zig-zag-encoded uint64 as an int64. |
260
|
519 |
// |
256
|
520 |
// Input: {…, 5, 3, 1, 0, 2, 4, 6, …} |
|
521 |
// Output: {…, -3, -2, -1, 0, +1, +2, +3, …} |
|
522 |
func DecodeZigZag(x uint64) int64 { |
|
523 |
return int64(x>>1) ^ int64(x)<<63>>63 |
|
524 |
} |
|
525 |
|
|
526 |
// EncodeZigZag encodes an int64 as a zig-zag-encoded uint64. |
260
|
527 |
// |
256
|
528 |
// Input: {…, -3, -2, -1, 0, +1, +2, +3, …} |
|
529 |
// Output: {…, 5, 3, 1, 0, 2, 4, 6, …} |
|
530 |
func EncodeZigZag(x int64) uint64 { |
|
531 |
return uint64(x<<1) ^ uint64(x>>63) |
|
532 |
} |
|
533 |
|
|
534 |
// DecodeBool decodes a uint64 as a bool. |
260
|
535 |
// |
256
|
536 |
// Input: { 0, 1, 2, …} |
|
537 |
// Output: {false, true, true, …} |
|
538 |
func DecodeBool(x uint64) bool { |
|
539 |
return x != 0 |
|
540 |
} |
|
541 |
|
|
542 |
// EncodeBool encodes a bool as a uint64. |
260
|
543 |
// |
256
|
544 |
// Input: {false, true} |
|
545 |
// Output: { 0, 1} |
|
546 |
func EncodeBool(x bool) uint64 { |
|
547 |
if x { |
|
548 |
return 1 |
|
549 |
} |
|
550 |
return 0 |
|
551 |
} |