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hex_test.ts
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hex_test.ts
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// Ported from Go
// https://github.com/golang/go/blob/go1.12.5/src/encoding/hex/hex.go
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
import { assertEquals, assertThrows } from "../testing/asserts.ts";
import {
encodedLen,
encode,
encodeToString,
decodedLen,
decode,
decodeString,
errLength,
errInvalidByte,
} from "./hex.ts";
function toByte(s: string): number {
return new TextEncoder().encode(s)[0];
}
const testCases = [
// encoded(hex) / decoded(Uint8Array)
["", []],
["0001020304050607", [0, 1, 2, 3, 4, 5, 6, 7]],
["08090a0b0c0d0e0f", [8, 9, 10, 11, 12, 13, 14, 15]],
["f0f1f2f3f4f5f6f7", [0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7]],
["f8f9fafbfcfdfeff", [0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff]],
["67", Array.from(new TextEncoder().encode("g"))],
["e3a1", [0xe3, 0xa1]],
];
const errCases = [
// encoded(hex) / error
["", "", undefined],
["0", "", errLength()],
["zd4aa", "", errInvalidByte(toByte("z"))],
["d4aaz", "\xd4\xaa", errInvalidByte(toByte("z"))],
["30313", "01", errLength()],
["0g", "", errInvalidByte(new TextEncoder().encode("g")[0])],
["00gg", "\x00", errInvalidByte(new TextEncoder().encode("g")[0])],
["0\x01", "", errInvalidByte(new TextEncoder().encode("\x01")[0])],
["ffeed", "\xff\xee", errLength()],
];
Deno.test({
name: "[encoding.hex] encodedLen",
fn(): void {
assertEquals(encodedLen(0), 0);
assertEquals(encodedLen(1), 2);
assertEquals(encodedLen(2), 4);
assertEquals(encodedLen(3), 6);
assertEquals(encodedLen(4), 8);
},
});
Deno.test({
name: "[encoding.hex] encode",
fn(): void {
{
const srcStr = "abc";
const src = new TextEncoder().encode(srcStr);
const dest = new Uint8Array(encodedLen(src.length));
const int = encode(dest, src);
assertEquals(src, new Uint8Array([97, 98, 99]));
assertEquals(int, 6);
}
{
const srcStr = "abc";
const src = new TextEncoder().encode(srcStr);
const dest = new Uint8Array(2); // out of index
assertThrows(
(): void => {
encode(dest, src);
},
Error,
"Out of index."
);
}
for (const [enc, dec] of testCases) {
const dest = new Uint8Array(encodedLen(dec.length));
const src = new Uint8Array(dec as number[]);
const n = encode(dest, src);
assertEquals(dest.length, n);
assertEquals(new TextDecoder().decode(dest), enc);
}
},
});
Deno.test({
name: "[encoding.hex] encodeToString",
fn(): void {
for (const [enc, dec] of testCases) {
assertEquals(encodeToString(new Uint8Array(dec as number[])), enc);
}
},
});
Deno.test({
name: "[encoding.hex] decodedLen",
fn(): void {
assertEquals(decodedLen(0), 0);
assertEquals(decodedLen(2), 1);
assertEquals(decodedLen(4), 2);
assertEquals(decodedLen(6), 3);
assertEquals(decodedLen(8), 4);
},
});
Deno.test({
name: "[encoding.hex] decode",
fn(): void {
// Case for decoding uppercase hex characters, since
// Encode always uses lowercase.
const extraTestcase = [
["F8F9FAFBFCFDFEFF", [0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff]],
];
const cases = testCases.concat(extraTestcase);
for (const [enc, dec] of cases) {
const dest = new Uint8Array(decodedLen(enc.length));
const src = new TextEncoder().encode(enc as string);
const [, err] = decode(dest, src);
assertEquals(err, undefined);
assertEquals(Array.from(dest), Array.from(dec as number[]));
}
},
});
Deno.test({
name: "[encoding.hex] decodeString",
fn(): void {
for (const [enc, dec] of testCases) {
const dst = decodeString(enc as string);
assertEquals(dec, Array.from(dst));
}
},
});
Deno.test({
name: "[encoding.hex] decode error",
fn(): void {
for (const [input, output, expectedErr] of errCases) {
const out = new Uint8Array((input as string).length + 10);
const [n, err] = decode(out, new TextEncoder().encode(input as string));
assertEquals(
new TextDecoder("ascii").decode(out.slice(0, n)),
output as string
);
assertEquals(err, expectedErr);
}
},
});
Deno.test({
name: "[encoding.hex] decodeString error",
fn(): void {
for (const [input, output, expectedErr] of errCases) {
if (expectedErr) {
assertThrows(
(): void => {
decodeString(input as string);
},
Error,
(expectedErr as Error).message
);
} else {
const out = decodeString(input as string);
assertEquals(new TextDecoder("ascii").decode(out), output as string);
}
}
},
});