This is an implementation of Compound Binary File v.3
Allows reading existing files, creation of the/write operation
To parse existing Compound Binary File:
const reader = new FileReader(); reader.onload = function() { var arrayBuffer = reader.result; var cfb = CompoundFile.fromUint8Array(new Uint8Array(arrayBuffer)); const rootStorage: RootStorageDirectoryEntry = cfb.getRootStorage(); const subStorages: StorageDirectoryEntry[] = rootStorage.storages(); const subStreams: StreamDirectoryEntry[] = rootStorage.streams(); // etc. } reader.readAsArrayBuffer(input.files[0]); Or alternatively you may use the following syntax if you read file as number[]:
var cfb = CompoundFile.fromUint8Array([...arrayOfBytes]); To create new Compound File:
const cfb = CompoundFile.empty(); const storage1: StorageDirectoryEntry = cfb.getRootStorage().addStorage('storage1'); const stream1: StreamDirectoryEntry = storage1.addStream('stream1', [1,2,3,4]); const fileBytes: number[] = cfb.asBytes();