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--
--------------------------------------------------------------------------------
-- FILE: encoder.lua
-- DESCRIPTION: protoc-gen-lua
-- Google's Protocol Buffers project, ported to lua.
-- https://code.google.com/p/protoc-gen-lua/
--
-- Copyright (c) 2010 , æ—å“毅 (Zhuoyi Lin) netsnail@gmail.com
-- All rights reserved.
--
-- Use, modification and distribution are subject to the "New BSD License"
-- as listed at <url: http://www.opensource.org/licenses/bsd-license.php >.
--
-- COMPANY: NetEase
-- CREATED: 2010年07月29日 19时30分46秒 CST
--------------------------------------------------------------------------------
--
local string = string
local table = table
local ipairs = ipairs
local assert =assert
local pb = require "pb"
local wire_format = require "wire_format"
module "encoder"
function _VarintSize(value)
if value <= 0x7f then return 1 end
if value <= 0x3fff then return 2 end
if value <= 0x1fffff then return 3 end
if value <= 0xfffffff then return 4 end
return 5
end
function _SignedVarintSize(value)
if value < 0 then return 10 end
if value <= 0x7f then return 1 end
if value <= 0x3fff then return 2 end
if value <= 0x1fffff then return 3 end
if value <= 0xfffffff then return 4 end
return 5
end
function _TagSize(field_number)
return _VarintSize(wire_format.PackTag(field_number, 0))
end
function _SimpleSizer(compute_value_size)
return function(field_number, is_repeated, is_packed)
local tag_size = _TagSize(field_number)
if is_packed then
local VarintSize = _VarintSize
return function(value)
local result = 0
for _, element in ipairs(value) do
result = result + compute_value_size(element)
end
return result + VarintSize(result) + tag_size
end
elseif is_repeated then
return function(value)
local result = tag_size * #value
for _, element in ipairs(value) do
result = result + compute_value_size(element)
end
return result
end
else
return function (value)
return tag_size + compute_value_size(value)
end
end
end
end
function _ModifiedSizer(compute_value_size, modify_value)
return function (field_number, is_repeated, is_packed)
local tag_size = _TagSize(field_number)
if is_packed then
local VarintSize = _VarintSize
return function (value)
local result = 0
for _, element in ipairs(value) do
result = result + compute_value_size(modify_value(element))
end
return result + VarintSize(result) + tag_size
end
elseif is_repeated then
return function (value)
local result = tag_size * #value
for _, element in ipairs(value) do
result = result + compute_value_size(modify_value(element))
end
return result
end
else
return function (value)
return tag_size + compute_value_size(modify_value(value))
end
end
end
end
function _FixedSizer(value_size)
return function (field_number, is_repeated, is_packed)
local tag_size = _TagSize(field_number)
if is_packed then
local VarintSize = _VarintSize
return function (value)
local result = #value * value_size
return result + VarintSize(result) + tag_size
end
elseif is_repeated then
local element_size = value_size + tag_size
return function(value)
return #value * element_size
end
else
local field_size = value_size + tag_size
return function (value)
return field_size
end
end
end
end
Int32Sizer = _SimpleSizer(_SignedVarintSize)
Int64Sizer = Int32Sizer
EnumSizer = Int32Sizer
UInt32Sizer = _SimpleSizer(_VarintSize)
UInt64Sizer = UInt32Sizer
SInt32Sizer = _ModifiedSizer(_SignedVarintSize, wire_format.ZigZagEncode)
SInt64Sizer = SInt32Sizer
Fixed32Sizer = _FixedSizer(4)
SFixed32Sizer = Fixed32Sizer
FloatSizer = Fixed32Sizer
Fixed64Sizer = _FixedSizer(8)
SFixed64Sizer = Fixed64Sizer
DoubleSizer = Fixed64Sizer
BoolSizer = _FixedSizer(1)
function StringSizer(field_number, is_repeated, is_packed)
local tag_size = _TagSize(field_number)
local VarintSize = _VarintSize
assert(not is_packed)
if is_repeated then
return function(value)
local result = tag_size * #value
for _, element in ipairs(value) do
local l = #element
result = result + VarintSize(l) + l
end
return result
end
else
return function(value)
local l = #value
return tag_size + VarintSize(l) + l
end
end
end
function BytesSizer(field_number, is_repeated, is_packed)
local tag_size = _TagSize(field_number)
local VarintSize = _VarintSize
assert(not is_packed)
if is_repeated then
return function (value)
local result = tag_size * #value
for _,element in ipairs(value) do
local l = #element
result = result + VarintSize(l) + l
end
return result
end
else
return function (value)
local l = #value
return tag_size + VarintSize(l) + l
end
end
end
function MessageSizer(field_number, is_repeated, is_packed)
local tag_size = _TagSize(field_number)
local VarintSize = _VarintSize
assert(not is_packed)
if is_repeated then
return function(value)
local result = tag_size * #value
for _,element in ipairs(value) do
local l = element:ByteSize()
result = result + VarintSize(l) + l
end
return result
end
else
return function (value)
local l = value:ByteSize()
return tag_size + VarintSize(l) + l
end
end
end
-- ====================================================================
-- Encoders!
local _EncodeVarint = pb.varint_encoder
local _EncodeSignedVarint = pb.signed_varint_encoder
function _VarintBytes(value)
local out = {}
local write = function(value)
out[#out + 1 ] = value
end
_EncodeSignedVarint(write, value)
return table.concat(out)
end
function TagBytes(field_number, wire_type)
return _VarintBytes(wire_format.PackTag(field_number, wire_type))
end
function _SimpleEncoder(wire_type, encode_value, compute_value_size)
return function(field_number, is_repeated, is_packed)
if is_packed then
local tag_bytes = TagBytes(field_number, wire_format.WIRETYPE_LENGTH_DELIMITED)
local EncodeVarint = _EncodeVarint
return function(write, value)
write(tag_bytes)
local size = 0
for _, element in ipairs(value) do
size = size + compute_value_size(element)
end
EncodeVarint(write, size)
for element in value do
encode_value(write, element)
end
end
elseif is_repeated then
local tag_bytes = TagBytes(field_number, wire_type)
return function(write, value)
for _, element in ipairs(value) do
write(tag_bytes)
encode_value(write, element)
end
end
else
local tag_bytes = TagBytes(field_number, wire_type)
return function(write, value)
write(tag_bytes)
encode_value(write, value)
end
end
end
end
function _ModifiedEncoder(wire_type, encode_value, compute_value_size, modify_value)
return function (field_number, is_repeated, is_packed)
if is_packed then
local tag_bytes = TagBytes(field_number, wire_format.WIRETYPE_LENGTH_DELIMITED)
local EncodeVarint = _EncodeVarint
return function (write, value)
write(tag_bytes)
local size = 0
for _, element in ipairs(value) do
size = size + compute_value_size(modify_value(element))
end
EncodeVarint(write, size)
for _, element in ipairs(value) do
encode_value(write, modify_value(element))
end
end
elseif is_repeated then
local tag_bytes = TagBytes(field_number, wire_type)
return function (write, value)
for _, element in ipairs(value) do
write(tag_bytes)
encode_value(write, modify_value(element))
end
end
else
local tag_bytes = TagBytes(field_number, wire_type)
return function (write, value)
write(tag_bytes)
encode_value(write, modify_value(value))
end
end
end
end
function _StructPackEncoder(wire_type, value_size, format)
return function(field_number, is_repeated, is_packed)
local struct_pack = pb.struct_pack
if is_packed then
local tag_bytes = TagBytes(field_number, wire_format.WIRETYPE_LENGTH_DELIMITED)
local EncodeVarint = _EncodeVarint
return function (write, value)
write(tag_bytes)
EncodeVarint(write, #value * value_size)
for _, element in ipairs(value) do
struct_pack(write, format, element)
end
end
elseif is_repeated then
local tag_bytes = TagBytes(field_number, wire_type)
return function (write, value)
for _, element in ipairs(value) do
write(tag_bytes)
struct_pack(write, format, element)
end
end
else
local tag_bytes = TagBytes(field_number, wire_type)
return function (write, value)
write(tag_bytes)
struct_pack(write, format, value)
end
end
end
end
Int32Encoder = _SimpleEncoder(wire_format.WIRETYPE_VARINT, _EncodeSignedVarint, _SignedVarintSize)
Int64Encoder = Int32Encoder
EnumEncoder = Int32Encoder
UInt32Encoder = _SimpleEncoder(wire_format.WIRETYPE_VARINT, _EncodeVarint, _VarintSize)
UInt64Encoder = UInt32Encoder
SInt32Encoder = _ModifiedEncoder(
wire_format.WIRETYPE_VARINT, _EncodeVarint, _VarintSize,
wire_format.ZigZagEncode32)
SInt64Encoder = _ModifiedEncoder(
wire_format.WIRETYPE_VARINT, _EncodeVarint, _VarintSize,
wire_format.ZigZagEncode64)
Fixed32Encoder = _StructPackEncoder(wire_format.WIRETYPE_FIXED32, 4, string.byte('I'))
Fixed64Encoder = _StructPackEncoder(wire_format.WIRETYPE_FIXED64, 8, string.byte('Q'))
SFixed32Encoder = _StructPackEncoder(wire_format.WIRETYPE_FIXED32, 4, string.byte('i'))
SFixed64Encoder = _StructPackEncoder(wire_format.WIRETYPE_FIXED64, 8, string.byte('q'))
FloatEncoder = _StructPackEncoder(wire_format.WIRETYPE_FIXED32, 4, string.byte('f'))
DoubleEncoder = _StructPackEncoder(wire_format.WIRETYPE_FIXED64, 8, string.byte('d'))
function BoolEncoder(field_number, is_repeated, is_packed)
local false_byte = '\0'
local true_byte = '\1'
if is_packed then
local tag_bytes = TagBytes(field_number, wire_format.WIRETYPE_LENGTH_DELIMITED)
local EncodeVarint = _EncodeVarint
return function (write, value)
write(tag_bytes)
EncodeVarint(write, #value)
for _, element in ipairs(value) do
if element then
write(true_byte)
else
write(false_byte)
end
end
end
elseif is_repeated then
local tag_bytes = TagBytes(field_number, wire_format.WIRETYPE_VARINT)
return function(write, value)
for _, element in ipairs(value) do
write(tag_bytes)
if element then
write(true_byte)
else
write(false_byte)
end
end
end
else
local tag_bytes = TagBytes(field_number, wire_format.WIRETYPE_VARINT)
return function (write, value)
write(tag_bytes)
if value then
return write(true_byte)
end
return write(false_byte)
end
end
end
function StringEncoder(field_number, is_repeated, is_packed)
local tag = TagBytes(field_number, wire_format.WIRETYPE_LENGTH_DELIMITED)
local EncodeVarint = _EncodeVarint
assert(not is_packed)
if is_repeated then
return function (write, value)
for _, element in ipairs(value) do
-- encoded = element.encode('utf-8')
write(tag)
EncodeVarint(write, #element)
write(element)
end
end
else
return function (write, value)
-- local encoded = value.encode('utf-8')
write(tag)
EncodeVarint(write, #value)
return write(value)
end
end
end
function BytesEncoder(field_number, is_repeated, is_packed)
local tag = TagBytes(field_number, wire_format.WIRETYPE_LENGTH_DELIMITED)
local EncodeVarint = _EncodeVarint
assert(not is_packed)
if is_repeated then
return function (write, value)
for _, element in ipairs(value) do
write(tag)
EncodeVarint(write, #element)
write(element)
end
end
else
return function(write, value)
write(tag)
EncodeVarint(write, #value)
return write(value)
end
end
end
function MessageEncoder(field_number, is_repeated, is_packed)
local tag = TagBytes(field_number, wire_format.WIRETYPE_LENGTH_DELIMITED)
local EncodeVarint = _EncodeVarint
assert(not is_packed)
if is_repeated then
return function(write, value)
for _, element in ipairs(value) do
write(tag)
EncodeVarint(write, element:ByteSize())
element:_InternalSerialize(write)
end
end
else
return function (write, value)
write(tag)
EncodeVarint(write, value:ByteSize())
return value:_InternalSerialize(write)
end
end
end