6.10 protobuf.js decode failed

[XiaomingZhang]

Hello
My server is PHP, use google protobuf php lib, client use protobuf.js. use http post method .

Php server return protobuf encode string data, client receive success. receive data length and php send data length the same.

I use StringToUint8Array , string conver to array, then use protobuf.js decode ,

function StringToUint8Array(str)
var buf = new ArrayBuffer(str.length);
var bufView = new Uint8Array(buf);
for (var i=0, strLen=str.length; i<strLen; i++) {
bufView[i] = str.charCodeAt(i);
}
return bufView;
}

My .proto file

syntax = "proto3";
package login;
message LoginResponse {
uint32 code = 1;
string unick = 2;
}

But the LoginResponse.code < 128 is OK, if code == 129 the decode is change 253
The string type is the same, the string length == 129, error is

Uncaught RangeError: index out of range: 6 + 253 > 135

I think the question is Hight-order and Low-order of a uint32 ?

Then I try use js encode and decode protobuf is OK!!!

JS encode data the same to server, and all print to console

JS encode:

[8, 129, 1, 18, 129, 1, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115…]

receive from server and StringToUint8Array

[8, 253, 1, 18, 253, 1, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115…]

How can I do it, the protobuf.js has method from php encode protobuf string data conver to uint8array ? Thanks a lot !

[dcodeIO]

Haven't looked over this in detail, but maybe related: https://github.com/dcodeIO/protobuf.js/wiki/How-to-read-binary-data-in-the-browser-or-under-node.js%3F

[XiaomingZhang]

Indeed, but I failed !
PHP add code

header('Content-Type: application/octet-stream');
OR
header('Content-Transfer-Encoding: binary');

Js client XHR.response is ArrayBuffer type, but content is { } .

Or I where do wrong ?
PHP server has sample code?

Thanks a lot!

[dcodeIO]

I haven't used the php library myself, unfortunately. Isn't there a safer way to work with buffers in PHP, instead of converting hence and forth from/to strings? String conversion often results in corrupted data due to the underlying encoding used (i.e. utf8, utf16le).

[XiaomingZhang]

JS client change code

XMLHttpRequest: responseType="arraybuffer"

I tried a lot of methods
I can't receive any data from server.
If remove responseType , I can receive protobuf string data , but can't decode.

Thanks a lot!

[dcodeIO]

On the PHP side, you have to make sure that it outputs proper binary data. Then, using header('Content-Type: application/octet-stream'); seems right to me.

[XiaomingZhang]

Thanks for your reply !
I cant test success, May be I don't know how to use. I have begun to use Google/protobuf/js and success.
But I really, really thank you very much for you help !

[dcodeIO]

You are welcome! Feel free to reopen when necessary.