Function CuteFile

static/webuploader/webuploader.html5nodepend.js:3918–3962

( file, chunkSize )

    
        // 负责将文件切片。
        function CuteFile( file, chunkSize ) {
            var pending = [],
                blob = file.source,
                total = blob.size,
                chunks = chunkSize ? Math.ceil( total / chunkSize ) : 1,
                start = 0,
                index = 0,
                len, api;
    
            api = {
                file: file,
    
                has: function() {
                    return !!pending.length;
                },
    
                shift: function() {
                    return pending.shift();
                },
    
                unshift: function( block ) {
                    pending.unshift( block );
                }
            };
    
            while ( index < chunks ) {
                len = Math.min( chunkSize, total - start );
    
                pending.push({
                    file: file,
                    start: start,
                    end: chunkSize ? (start + len) : total,
                    total: total,
                    chunks: chunks,
                    chunk: index++,
                    cuted: api
                });
                start += len;
            }
    
            file.blocks = pending.concat();
            file.remaning = pending.length;
    
            return api;
        }
    
        Uploader.register({
            name: 'upload',