48 lines
1.5 KiB
Markdown
48 lines
1.5 KiB
Markdown
BufferCursor
|
|
============
|
|
|
|
This is a simple module that allows you to traverse a Buffer iteratively. You
|
|
can read and write different types and the cursor's position will update with
|
|
the proper size, which you can see through `.tell()` you can also
|
|
`.seek()`
|
|
|
|
```javascript
|
|
var bc = new BufferCursor(buffer);
|
|
bc.readUInt16BE();
|
|
bc.readUInt8();
|
|
bc.readUInt32BE();
|
|
console.log(bc.tell());
|
|
```
|
|
|
|
Will output `7`
|
|
|
|
Methods
|
|
-------
|
|
|
|
For the most part `BufferCursor` and `Buffer` share the same methods, there's
|
|
just a slight alteration in method signature, none of the methods take an
|
|
offset.
|
|
|
|
So `.readUInt16LE(10)` in `Buffer` is equivalent to `bs.seek(10); bs.readUInt16LE();`
|
|
|
|
All `read[U]Int` and `write[U]Int` methods are reproduced, as are `toString`,
|
|
`write`, `fill`, and `slice`. All of these methods will move the cursor through
|
|
the stream and do not take an offset parameter, where an `end` parameter would
|
|
normaly be used, here you supply a `length`.
|
|
|
|
The following are additional methods:
|
|
|
|
* `seek(value)` -- Seek to an arbitrary position in the stream
|
|
* `tell()` -- Return the current location in the stream
|
|
* `eof()` -- Return true if at the end of the stream
|
|
* `toByteArray([method])` -- This is a special helper method which will return
|
|
the *entire* stream (i.e. from the start) as an array of numbers.
|
|
- By default it will use `readUInt8` but you can pass in any
|
|
`read[U]Int[8,16,32][LE,BE]` to change what the array is made of
|
|
|
|
Properties
|
|
----------
|
|
|
|
* `.buffer` -- Access to the raw buffer
|
|
* `.length` -- The size of the buffer
|