@agile-dev/wx-protobuf/protobufjs/src/decoder.js

微信小程序使用的 protobuf 协议开发工具

/**
 * Created by zhangmiao on 2018/3/13.
 */

var Enum,
    types,
    util;


function missing(field) {
    return "missing required '" + field.name + "'";
}

function decoder(mtype){
    return function (options){
        var Reader = options.Reader;
        var _types = options.types;
        var _util   = options.util;
        return function (r, l){
            if(!(r instanceof Reader))
                r = Reader.create(r);
            var c = l === undefined ? r.len : r.pos + l,
                m = new this.ctor;
            var k;
            while (r.pos < c){
                var t = r.uint32();
                if (mtype.group){
                    if((t&7) === 4)
                        break;
                }
                var fieldId = t>>>3;
                var i = 0;
                var find = false;
                for (; i < mtype.fieldsArray.length; ++i){
                    var field = mtype._fieldsArray[i].resolve(),
                        name  = field.name,
                        type  = field.resolvedType instanceof Enum ? "int32" : field.type;
                        //ref   = m[field.name];
                    if (fieldId != field.id) continue;
                    find = true;
                    if (field.map){
                        r.skip().pos++;
                        if(m[name] === _util.emptyObject)
                            m[name] = {};
                        k = r[field.keyType]();
                        r.pos++;
                        if(types.long[field.keyType] != undefined){
                            if(types.basic[type] == undefined){
                                m[name][typeof k ==='object' ? _util.longToHash(k):k] = _types[i].decode(r, r.uint32());
                            }else {
                                m[name][typeof k ==='object' ? _util.longToHash(k):k] = r[type]();
                            }
                        }else {
                            if(types.basic[type] == undefined){
                                m[name] = _types[i].decode(r, r.uint32());
                            }else {
                                m[name] = r[type]();
                            }
                        }
                    }else if(field.repeated){
                        if(!(m[name] && m[name].length)){
                            m[name] = [];
                        }

                        if(types.packed[type] != undefined && (t&7) === 2){
                            var c2 = r.uint32()+ r.pos;
                            while (r.pos < c2)
                                m[name].push(r[type]())
                        }else {
                            if(types.basic[type] == undefined){
                                field.resolvedType.group ?
                                    m[name].push(_types[i].decode(r)) :
                                    m[name].push(_types[i].decode(r, r.uint32()))

                            }else {
                                m[name].push(r[type]());
                            }
                        }
                    }else if (types.basic[type] == undefined){
                        if(field.resolvedType.group){
                            m[name] = _types[i].decode(r);
                        }else {
                            m[name] = _types[i].decode(r, r.uint32());
                        }
                    }else {
                        //console.log("m",JSON.stringify(m),"type",type,"field",field);
                        m[name] = r[type]();
                    }
                    break;
                }

                if(!find){
                    console.log("t",t);
                    r.skipType(t&7)
                }

            }

            for (i = 0; i < mtype._fieldsArray.length; ++ i){
                var rfield = mtype._fieldsArray[i];
                if(rfield.required){
                    if(!m.hasOwnProperty(rfield.name)){
                        throw util.ProtocolError(missing(rfield),{instance:m})
                    }
                }
            }
            //mtype.fieldsArray.filter(function(field) { return field.map; }).length
            return m;
        }
    }
}

module.exports = decoder;
decoder._configure  = function (){
    Enum    = require("./enum");
    types   = require("./types");
    util    = require("./util");
};