https://github.com/sail-sail/block_stream2

A stream of blocks. Write data into it, and it'll output data in buffer blocks the size you specify, padding with zeroes if necessary.
https://github.com/sail-sail/block_stream2

Last synced: 21 days ago
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A stream of blocks. Write data into it, and it'll output data in buffer blocks the size you specify, padding with zeroes if necessary.

• Host: GitHub
• URL: https://github.com/sail-sail/block_stream2
• Owner: sail-sail
• Created: 2022-05-23T01:22:57.000Z (over 2 years ago)
• Default Branch: main
• Last Pushed: 2022-05-23T02:31:30.000Z (over 2 years ago)
• Last Synced: 2024-10-04T13:11:40.882Z (about 1 month ago)
• Language: TypeScript
• Size: 1.95 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# block_stream2

A stream of blocks.

Write data into it, and it'll output data in buffer blocks the size you specify, padding with zeroes if necessary.

fock by https://github.com/substack/block-stream2

## usage

```ts

import { assert, assertEquals } from "https://deno.land/[email protected]/testing/asserts.ts";

import { stat } from "https://deno.land/[email protected]/node/fs/promises.ts"

import fs from "https://deno.land/[email protected]/node/fs.ts";

import { Buffer } from "https://deno.land/[email protected]/node/buffer.ts";

import { BlockStream2 } from "https://deno.land/x/block_stream2/mod.ts";

Deno.test("BlockStream2", async function() {

  const b = new BlockStream2(16);

	const fstr = fs.createReadStream("./mod_test.ts", { encoding: 'utf8' })

  fstr.pipe(b)

  b.resume();

	let totalBytes = 0;

	const stats = await stat("./mod_test.ts");

	await new Promise((resolve, reject) => {

		b.on("data", (data) => {

			assertEquals(data.byteLength, 16, 'chunks should be 16 bytes long');

			assert(Buffer.isBuffer(data));

			totalBytes += data.length;

		});

		b.on("error", reject);

		b.on('end', () => {

			const expectedBytes = stats.size + (16 - stats.size % 16)

			assertEquals(totalBytes, expectedBytes);

			resolve(undefined);

		});

	});

});

```

When .end() or .flush() is called, it'll pad the block with zeroes.