feat(tabstractfileconvertor): allow to load files from string, url OR directly from memory

Author: Itee

sources/core/converters/TAbstractFileConverter.js

@@ -12,6 +12,7 @@ import * as globalBuffer from 'buffer'
 import fs                from 'fs'
 import {
     isNull,
+    isString,
     isUndefined
 }                        from 'itee-validators'
 import { Writable }      from 'stream'
@@ -168,20 +169,58 @@ class TAbstractFileConverter {
 
         const self       = this
         const dataBloc   = this._queue.shift()
-        const data       = dataBloc.file
+        const file       = dataBloc.file
         const parameters = dataBloc.parameters
         const onSuccess  = dataBloc.onSuccess
         const onProgress = dataBloc.onProgress
         const onError    = dataBloc.onError
 
-        self._dumpFileInMemoryAs(
-            self._dumpType,
-            data,
-            parameters,
-            _onDumpSuccess,
-            _onProcessProgress,
-            _onProcessError
-        )
+        if ( isString( file ) ) {
+
+            self._dumpFileInMemoryAs(
+                self._dumpType,
+                file,
+                parameters,
+                _onDumpSuccess,
+                _onProcessProgress,
+                _onProcessError
+            )
+
+        } else {
+
+            const data = file.data
+
+            switch ( self._dumpType ) {
+
+                case TAbstractFileConverter.DumpType.ArrayBuffer: {
+
+                    const bufferSize  = data.length
+                    const arrayBuffer = new ArrayBuffer( bufferSize )
+                    const view        = new Uint8Array( arrayBuffer )
+
+                    for ( let i = 0 ; i < bufferSize ; ++i ) {
+                        view[ i ] = buffer[ i ]
+                    }
+
+                    _onDumpSuccess( arrayBuffer )
+
+                }
+                    break
+
+                case TAbstractFileConverter.DumpType.JSON:
+                    _onDumpSuccess( JSON.parse( data.toString() ) )
+                    break
+
+                case TAbstractFileConverter.DumpType.String:
+                    _onDumpSuccess( data.toString() )
+                    break
+
+                default:
+                    throw new RangeError( `Invalid switch parameter: ${self._dumpType}` )
+
+            }
+
+        }
 
         function _onDumpSuccess ( data ) {