41 lines
1.2 KiB
JavaScript
41 lines
1.2 KiB
JavaScript
import { STORAGE_TYPES } from './constants';
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export function SeedlingFile (volume, fileEntry) {
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var blocks = volume.blocks();
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var bitMap = volume.bitMap();
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return {
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getBlockPointers() {
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var pointers = [fileEntry.keyPointer];
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return pointers;
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},
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read: function () {
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var seedlingBlock = blocks[fileEntry.keyPointer];
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var data = new Uint8Array(fileEntry.eof);
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data.set(seedlingBlock.slice(0, fileEntry.eof));
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return data;
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},
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write: function(data) {
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if (fileEntry.keyPointer) {
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this.delete();
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}
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fileEntry.storageType = STORAGE_TYPES.SEEDLING;
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fileEntry.keyPointer = bitMap.allocBlock();
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fileEntry.eof = data.byteLength;
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var seedlingBlock = blocks[fileEntry.keyPointer];
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seedlingBlock.set(data);
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fileEntry.write();
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},
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delete: function() {
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var pointers = this.getBlockPointers();
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for (var idx; idx < pointers.length; idx++) {
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bitMap.freeBlock(pointers[idx]);
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}
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}
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};
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}
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