I'd just like to point out the existence of the Content-Range
header<http://tools.ietf.org/html/rfc2616#section-14.16>.
It's not thoroughly described for use in making uploads, but since it's an
entity-header, you can use it in requests/uploads as well as responses, and
there's several examples of it being used for making partial uploads.
Austin Wright.
On Saturday, June 22, 2013 6:35:17 AM UTC-7, yu sun wrote:
>
> I'm working on file uploading and want to chunk upload files to the
> server, but when i combined the chunked files, the file hash changed(diff
> from the orignal hash). There might be some mistakes. Please help. thx thx.
>
> There is a strange thing that if I upload the chunk file with chunk size
> larger than 11.4% of the file size, will got the hash correctly. Im on
> nodejs 0.10.6 now.
>
> *My client side code:*
> function putFile(fileStat){
> putChunks(fileStat.totalChunkNumber);
> function putChunks(totalChunkNumber){
> for(var i = 1; i <= totalChunkNumber; i++){
> putChunkFile(fileStat, i)
> }
> }
> }
>
> function putChunkFile(fileStat, chunkNumber){
>
> var filePath = fileStat.filePath;
> var _start = (chunkNumber - 1) * CHUNK_SIZE;
> var _end = _start + CHUNK_SIZE -1;
>
> if (_end >= fileStat.fileSize){
> _end = fileStat.fileSize;
> }
>
> var req = createRequest("/testfiles", "PUT",
> {
> 'X-Chunk-Number': chunkNumber,
> 'X-Chunk-Size': _end - _start + 1
> });
>
> var sourceStream = fs.createReadStream(filePath, {start: _start, end:
> _end});
>
> sourceStream.on("open", function(){
> sourceStream.pipe(req);
> });
>
> sourceStream.on("end", function(){
> req.end();
> });
> }
>
> *Server side code:*
> exports.put = function(req, res){
> var list = []
> var length = 0;
> req.on("data", function(data){
> list.push(data);
> length += data.length;
> }).on("end",function(){
> var buffer = Buffer.concat(list, length);
> fs.writeFile(path.join(getFilePath(), 'part' +
> req.headers['x-chunk-number']), buffer, function(){
> res.status(200);
> res.write('uploaded ' + req.headers['x-chunk-number']);
> res.end();
> });
> });
> }
>
>
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