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import { assert, test } from "vitest";
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import { encodeOfsDeltaDistance } from "@/worker/git";
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function decodeOfsDeltaDistance(bytes: Uint8Array): number {
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  let p = 0;
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  let b = bytes[p++];
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  let x = b & 0x7f;
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  while (b & 0x80) {
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    b = bytes[p++];
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    x = ((x + 1) << 7) | (b & 0x7f);
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  }
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  return x >>> 0;
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}
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const cases = [1, 0x7f, 0x80, 0x1234, 0x1ffff, 0x20000, 0x3ffffff, 0x4000000];
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test("encodeOfsDeltaDistance round-trips typical values", () => {
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  for (const n of cases) {
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    const enc = encodeOfsDeltaDistance(n);
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    const dec = decodeOfsDeltaDistance(enc);
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    assert.strictEqual(
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      dec,
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      n,
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      `round-trip failed for ${n} (enc: ${Array.from(enc)
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        .map((b) => b.toString(16))
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        .join(",")})`
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    );
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  }
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});