github.com/m3db/m3@v1.5.0/src/dbnode/encoding/proto/buffer_encode.go (about)

     1  // Copyright (c) 2019 Uber Technologies, Inc.
     2  //
     3  // Permission is hereby granted, free of charge, to any person obtaining a copy
     4  // of this software and associated documentation files (the "Software"), to deal
     5  // in the Software without restriction, including without limitation the rights
     6  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     7  // copies of the Software, and to permit persons to whom the Software is
     8  // furnished to do so, subject to the following conditions:
     9  //
    10  // The above copyright notice and this permission notice shall be included in
    11  // all copies or substantial portions of the Software.
    12  //
    13  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    14  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    15  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    16  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    17  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    18  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    19  // THE SOFTWARE.
    20  
    21  // This file is mostly copy-pasta from: https://github.com/jhump/protoreflect/blob/master/dynamic/codec.go
    22  // since the jhump/protoreflect library does not expose the `codedBuffer` type.
    23  
    24  package proto
    25  
    26  func (cb *buffer) encodeTagAndWireType(tag int32, wireType int8) {
    27  	v := uint64((int64(tag) << 3) | int64(wireType))
    28  	cb.encodeVarint(v)
    29  }
    30  
    31  // EncodeVarint writes a varint-encoded integer to the Buffer.
    32  // This is the format for the
    33  // int32, int64, uint32, uint64, bool, and enum
    34  // protocol buffer types.
    35  func (cb *buffer) encodeVarint(x uint64) {
    36  	for x >= 1<<7 {
    37  		cb.buf = append(cb.buf, uint8(x&0x7f|0x80))
    38  		x >>= 7
    39  	}
    40  	cb.buf = append(cb.buf, uint8(x))
    41  }
    42  
    43  // EncodeFixed64 writes a 64-bit integer to the Buffer.
    44  // This is the format for the
    45  // fixed64, sfixed64, and double protocol buffer types.
    46  func (cb *buffer) encodeFixed64(x uint64) {
    47  	cb.buf = append(cb.buf,
    48  		uint8(x),
    49  		uint8(x>>8),
    50  		uint8(x>>16),
    51  		uint8(x>>24),
    52  		uint8(x>>32),
    53  		uint8(x>>40),
    54  		uint8(x>>48),
    55  		uint8(x>>56))
    56  }
    57  
    58  // EncodeFixed32 writes a 32-bit integer to the Buffer.
    59  // This is the format for the
    60  // fixed32, sfixed32, and float protocol buffer types.
    61  func (cb *buffer) encodeFixed32(x uint32) {
    62  	cb.buf = append(cb.buf,
    63  		uint8(x),
    64  		uint8(x>>8),
    65  		uint8(x>>16),
    66  		uint8(x>>24))
    67  }
    68  
    69  // EncodeRawBytes writes a count-delimited byte buffer to the Buffer.
    70  // This is the format used for the bytes protocol buffer
    71  // type and for embedded messages.
    72  func (cb *buffer) encodeRawBytes(b []byte) {
    73  	cb.encodeVarint(uint64(len(b)))
    74  	cb.buf = append(cb.buf, b...)
    75  }
    76  
    77  func (cb *buffer) append(b []byte) {
    78  	cb.buf = append(cb.buf, b...)
    79  }
    80  
    81  func encodeZigZag32(v int32) uint64 {
    82  	return uint64((uint32(v) << 1) ^ uint32((v >> 31)))
    83  }
    84  
    85  func encodeZigZag64(v int64) uint64 {
    86  	return (uint64(v) << 1) ^ uint64(v>>63)
    87  }