From cfc4bc1996d0bab0d71134855a02d612dac07eb8 Mon Sep 17 00:00:00 2001
From: Evan Hahn <me@evanhahn.com>
Date: Wed, 2 Aug 2023 11:43:02 -0500
Subject: [PATCH] PNG: parsing PNG data

No UI yet, but the parser seems mostly done.
---
 public/common/bytes.js         |  28 +++
 public/png/constants.js        |  99 +++++++++++
 public/png/crc32.js            |  28 +++
 public/png/index.html          |   2 +-
 public/png/parsePng.js         | 305 +++++++++++++++++++++++++++++++++
 public/png/png.js              |  13 +-
 test/common/base64url.test.ts  |   6 +-
 test/common/bytes.test.ts      |  20 +++
 test/helpers.ts                |  25 +++
 test/png/crc32.test.ts         |  21 +++
 test/png/fixtures/basi0g01.png | Bin 0 -> 217 bytes
 test/png/fixtures/basi0g02.png | Bin 0 -> 154 bytes
 test/png/fixtures/basi0g04.png | Bin 0 -> 247 bytes
 test/png/fixtures/basi0g08.png | Bin 0 -> 254 bytes
 test/png/fixtures/basi0g16.png | Bin 0 -> 299 bytes
 test/png/fixtures/basi2c08.png | Bin 0 -> 315 bytes
 test/png/fixtures/basi2c16.png | Bin 0 -> 595 bytes
 test/png/fixtures/basi3p01.png | Bin 0 -> 132 bytes
 test/png/fixtures/basi3p02.png | Bin 0 -> 193 bytes
 test/png/fixtures/basi3p04.png | Bin 0 -> 327 bytes
 test/png/fixtures/basi3p08.png | Bin 0 -> 1527 bytes
 test/png/fixtures/basi4a08.png | Bin 0 -> 214 bytes
 test/png/fixtures/basi4a16.png | Bin 0 -> 2855 bytes
 test/png/fixtures/basi6a08.png | Bin 0 -> 361 bytes
 test/png/fixtures/basi6a16.png | Bin 0 -> 4180 bytes
 test/png/fixtures/basn0g01.png | Bin 0 -> 164 bytes
 test/png/fixtures/basn0g02.png | Bin 0 -> 104 bytes
 test/png/fixtures/basn0g04.png | Bin 0 -> 145 bytes
 test/png/fixtures/basn0g08.png | Bin 0 -> 138 bytes
 test/png/fixtures/basn0g16.png | Bin 0 -> 167 bytes
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 test/png/fixtures/basn2c16.png | Bin 0 -> 302 bytes
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 test/png/fixtures/bgyn6a16.png | Bin 0 -> 3453 bytes
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 test/png/fixtures/cdun2c08.png | Bin 0 -> 724 bytes
 test/png/fixtures/ch1n3p04.png | Bin 0 -> 258 bytes
 test/png/fixtures/ch2n3p08.png | Bin 0 -> 1810 bytes
 test/png/fixtures/cm0n0g04.png | Bin 0 -> 292 bytes
 test/png/fixtures/cm7n0g04.png | Bin 0 -> 292 bytes
 test/png/fixtures/cm9n0g04.png | Bin 0 -> 292 bytes
 test/png/fixtures/cs3n2c16.png | Bin 0 -> 214 bytes
 test/png/fixtures/cs3n3p08.png | Bin 0 -> 259 bytes
 test/png/fixtures/cs5n2c08.png | Bin 0 -> 186 bytes
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 test/png/fixtures/cs8n2c08.png | Bin 0 -> 149 bytes
 test/png/fixtures/cs8n3p08.png | Bin 0 -> 256 bytes
 test/png/fixtures/ct0n0g04.png | Bin 0 -> 273 bytes
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 test/png/fixtures/f02n0g08.png | Bin 0 -> 355 bytes
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 test/png/fixtures/g04n0g16.png | Bin 0 -> 363 bytes
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 test/png/fixtures/g04n3p04.png | Bin 0 -> 219 bytes
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 test/png/fixtures/g07n2c08.png | Bin 0 -> 340 bytes
 test/png/fixtures/g07n3p04.png | Bin 0 -> 207 bytes
 test/png/fixtures/g10n0g16.png | Bin 0 -> 262 bytes
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 test/png/fixtures/g10n3p04.png | Bin 0 -> 214 bytes
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 test/png/fixtures/oi1n0g16.png | Bin 0 -> 167 bytes
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 test/png/fixtures/oi9n0g16.png | Bin 0 -> 1283 bytes
 test/png/fixtures/oi9n2c16.png | Bin 0 -> 3038 bytes
 test/png/fixtures/pp0n2c16.png | Bin 0 -> 962 bytes
 test/png/fixtures/pp0n6a08.png | Bin 0 -> 818 bytes
 test/png/fixtures/ps1n0g08.png | Bin 0 -> 1456 bytes
 test/png/fixtures/ps1n2c16.png | Bin 0 -> 1620 bytes
 test/png/fixtures/ps2n0g08.png | Bin 0 -> 2320 bytes
 test/png/fixtures/ps2n2c16.png | Bin 0 -> 2484 bytes
 test/png/fixtures/s01i3p01.png | Bin 0 -> 113 bytes
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 test/png/fixtures/s40i3p04.png | Bin 0 -> 357 bytes
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 test/png/fixtures/tbbn0g04.png | Bin 0 -> 429 bytes
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 test/png/fixtures/tbrn2c08.png | Bin 0 -> 1633 bytes
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 test/png/fixtures/tm3n3p02.png | Bin 0 -> 116 bytes
 test/png/fixtures/tp0n0g08.png | Bin 0 -> 719 bytes
 test/png/fixtures/tp0n2c08.png | Bin 0 -> 1594 bytes
 test/png/fixtures/tp0n3p08.png | Bin 0 -> 1476 bytes
 test/png/fixtures/tp1n3p08.png | Bin 0 -> 1483 bytes
 test/png/fixtures/xc1n0g08.png | Bin 0 -> 138 bytes
 test/png/fixtures/xc9n2c08.png | Bin 0 -> 145 bytes
 test/png/fixtures/xcrn0g04.png | Bin 0 -> 145 bytes
 test/png/fixtures/xcsn0g01.png | Bin 0 -> 164 bytes
 test/png/fixtures/xd0n2c08.png | Bin 0 -> 145 bytes
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 test/png/fixtures/xd9n2c08.png | Bin 0 -> 145 bytes
 test/png/fixtures/xdtn0g01.png | Bin 0 -> 61 bytes
 test/png/fixtures/xhdn0g08.png | Bin 0 -> 138 bytes
 test/png/fixtures/xlfn0g04.png | Bin 0 -> 145 bytes
 test/png/fixtures/xs1n0g01.png | Bin 0 -> 164 bytes
 test/png/fixtures/xs2n0g01.png | Bin 0 -> 164 bytes
 test/png/fixtures/xs4n0g01.png | Bin 0 -> 164 bytes
 test/png/fixtures/xs7n0g01.png | Bin 0 -> 164 bytes
 test/png/fixtures/z00n2c08.png | Bin 0 -> 3172 bytes
 test/png/fixtures/z03n2c08.png | Bin 0 -> 232 bytes
 test/png/fixtures/z06n2c08.png | Bin 0 -> 224 bytes
 test/png/fixtures/z09n2c08.png | Bin 0 -> 224 bytes
 test/png/parseHash.test.ts     |  35 ++--
 test/png/parsePng.test.ts      | 124 ++++++++++++++
 types/png.d.ts                 |  19 ++
 188 files changed, 699 insertions(+), 26 deletions(-)
 create mode 100644 public/common/bytes.js
 create mode 100644 public/png/constants.js
 create mode 100644 public/png/crc32.js
 create mode 100644 public/png/parsePng.js
 create mode 100644 test/common/bytes.test.ts
 create mode 100644 test/helpers.ts
 create mode 100644 test/png/crc32.test.ts
 create mode 100644 test/png/fixtures/basi0g01.png
 create mode 100644 test/png/fixtures/basi0g02.png
 create mode 100644 test/png/fixtures/basi0g04.png
 create mode 100644 test/png/fixtures/basi0g08.png
 create mode 100644 test/png/fixtures/basi0g16.png
 create mode 100644 test/png/fixtures/basi2c08.png
 create mode 100644 test/png/fixtures/basi2c16.png
 create mode 100644 test/png/fixtures/basi3p01.png
 create mode 100644 test/png/fixtures/basi3p02.png
 create mode 100644 test/png/fixtures/basi3p04.png
 create mode 100644 test/png/fixtures/basi3p08.png
 create mode 100644 test/png/fixtures/basi4a08.png
 create mode 100644 test/png/fixtures/basi4a16.png
 create mode 100644 test/png/fixtures/basi6a08.png
 create mode 100644 test/png/fixtures/basi6a16.png
 create mode 100644 test/png/fixtures/basn0g01.png
 create mode 100644 test/png/fixtures/basn0g02.png
 create mode 100644 test/png/fixtures/basn0g04.png
 create mode 100644 test/png/fixtures/basn0g08.png
 create mode 100644 test/png/fixtures/basn0g16.png
 create mode 100644 test/png/fixtures/basn2c08.png
 create mode 100644 test/png/fixtures/basn2c16.png
 create mode 100644 test/png/fixtures/basn3p01.png
 create mode 100644 test/png/fixtures/basn3p02.png
 create mode 100644 test/png/fixtures/basn3p04.png
 create mode 100644 test/png/fixtures/basn3p08.png
 create mode 100644 test/png/fixtures/basn4a08.png
 create mode 100644 test/png/fixtures/basn4a16.png
 create mode 100644 test/png/fixtures/basn6a08.png
 create mode 100644 test/png/fixtures/basn6a16.png
 create mode 100644 test/png/fixtures/bgai4a08.png
 create mode 100644 test/png/fixtures/bgai4a16.png
 create mode 100644 test/png/fixtures/bgan6a08.png
 create mode 100644 test/png/fixtures/bgan6a16.png
 create mode 100644 test/png/fixtures/bgbn4a08.png
 create mode 100644 test/png/fixtures/bggn4a16.png
 create mode 100644 test/png/fixtures/bgwn6a08.png
 create mode 100644 test/png/fixtures/bgyn6a16.png
 create mode 100644 test/png/fixtures/ccwn2c08.png
 create mode 100644 test/png/fixtures/ccwn3p08.png
 create mode 100644 test/png/fixtures/cdfn2c08.png
 create mode 100644 test/png/fixtures/cdhn2c08.png
 create mode 100644 test/png/fixtures/cdsn2c08.png
 create mode 100644 test/png/fixtures/cdun2c08.png
 create mode 100644 test/png/fixtures/ch1n3p04.png
 create mode 100644 test/png/fixtures/ch2n3p08.png
 create mode 100644 test/png/fixtures/cm0n0g04.png
 create mode 100644 test/png/fixtures/cm7n0g04.png
 create mode 100644 test/png/fixtures/cm9n0g04.png
 create mode 100644 test/png/fixtures/cs3n2c16.png
 create mode 100644 test/png/fixtures/cs3n3p08.png
 create mode 100644 test/png/fixtures/cs5n2c08.png
 create mode 100644 test/png/fixtures/cs5n3p08.png
 create mode 100644 test/png/fixtures/cs8n2c08.png
 create mode 100644 test/png/fixtures/cs8n3p08.png
 create mode 100644 test/png/fixtures/ct0n0g04.png
 create mode 100644 test/png/fixtures/ct1n0g04.png
 create mode 100644 test/png/fixtures/cten0g04.png
 create mode 100644 test/png/fixtures/ctfn0g04.png
 create mode 100644 test/png/fixtures/ctgn0g04.png
 create mode 100644 test/png/fixtures/cthn0g04.png
 create mode 100644 test/png/fixtures/ctjn0g04.png
 create mode 100644 test/png/fixtures/ctzn0g04.png
 create mode 100644 test/png/fixtures/exif2c08.png
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 create mode 100644 test/png/fixtures/f01n0g08.png
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 create mode 100644 test/png/fixtures/g25n3p04.png
 create mode 100644 test/png/fixtures/oi1n0g16.png
 create mode 100644 test/png/fixtures/oi1n2c16.png
 create mode 100644 test/png/fixtures/oi2n0g16.png
 create mode 100644 test/png/fixtures/oi2n2c16.png
 create mode 100644 test/png/fixtures/oi4n0g16.png
 create mode 100644 test/png/fixtures/oi4n2c16.png
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 create mode 100644 test/png/fixtures/oi9n2c16.png
 create mode 100644 test/png/fixtures/pp0n2c16.png
 create mode 100644 test/png/fixtures/pp0n6a08.png
 create mode 100644 test/png/fixtures/ps1n0g08.png
 create mode 100644 test/png/fixtures/ps1n2c16.png
 create mode 100644 test/png/fixtures/ps2n0g08.png
 create mode 100644 test/png/fixtures/ps2n2c16.png
 create mode 100644 test/png/fixtures/s01i3p01.png
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 create mode 100644 test/png/fixtures/s02i3p01.png
 create mode 100644 test/png/fixtures/s02n3p01.png
 create mode 100644 test/png/fixtures/s03i3p01.png
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 create mode 100644 test/png/fixtures/s04i3p01.png
 create mode 100644 test/png/fixtures/s04n3p01.png
 create mode 100644 test/png/fixtures/s05i3p02.png
 create mode 100644 test/png/fixtures/s05n3p02.png
 create mode 100644 test/png/fixtures/s06i3p02.png
 create mode 100644 test/png/fixtures/s06n3p02.png
 create mode 100644 test/png/fixtures/s07i3p02.png
 create mode 100644 test/png/fixtures/s07n3p02.png
 create mode 100644 test/png/fixtures/s08i3p02.png
 create mode 100644 test/png/fixtures/s08n3p02.png
 create mode 100644 test/png/fixtures/s09i3p02.png
 create mode 100644 test/png/fixtures/s09n3p02.png
 create mode 100644 test/png/fixtures/s32i3p04.png
 create mode 100644 test/png/fixtures/s32n3p04.png
 create mode 100644 test/png/fixtures/s33i3p04.png
 create mode 100644 test/png/fixtures/s33n3p04.png
 create mode 100644 test/png/fixtures/s34i3p04.png
 create mode 100644 test/png/fixtures/s34n3p04.png
 create mode 100644 test/png/fixtures/s35i3p04.png
 create mode 100644 test/png/fixtures/s35n3p04.png
 create mode 100644 test/png/fixtures/s36i3p04.png
 create mode 100644 test/png/fixtures/s36n3p04.png
 create mode 100644 test/png/fixtures/s37i3p04.png
 create mode 100644 test/png/fixtures/s37n3p04.png
 create mode 100644 test/png/fixtures/s38i3p04.png
 create mode 100644 test/png/fixtures/s38n3p04.png
 create mode 100644 test/png/fixtures/s39i3p04.png
 create mode 100644 test/png/fixtures/s39n3p04.png
 create mode 100644 test/png/fixtures/s40i3p04.png
 create mode 100644 test/png/fixtures/s40n3p04.png
 create mode 100644 test/png/fixtures/tbbn0g04.png
 create mode 100644 test/png/fixtures/tbbn2c16.png
 create mode 100644 test/png/fixtures/tbbn3p08.png
 create mode 100644 test/png/fixtures/tbgn2c16.png
 create mode 100644 test/png/fixtures/tbgn3p08.png
 create mode 100644 test/png/fixtures/tbrn2c08.png
 create mode 100644 test/png/fixtures/tbwn0g16.png
 create mode 100644 test/png/fixtures/tbwn3p08.png
 create mode 100644 test/png/fixtures/tbyn3p08.png
 create mode 100644 test/png/fixtures/tm3n3p02.png
 create mode 100644 test/png/fixtures/tp0n0g08.png
 create mode 100644 test/png/fixtures/tp0n2c08.png
 create mode 100644 test/png/fixtures/tp0n3p08.png
 create mode 100644 test/png/fixtures/tp1n3p08.png
 create mode 100644 test/png/fixtures/xc1n0g08.png
 create mode 100644 test/png/fixtures/xc9n2c08.png
 create mode 100644 test/png/fixtures/xcrn0g04.png
 create mode 100644 test/png/fixtures/xcsn0g01.png
 create mode 100644 test/png/fixtures/xd0n2c08.png
 create mode 100644 test/png/fixtures/xd3n2c08.png
 create mode 100644 test/png/fixtures/xd9n2c08.png
 create mode 100644 test/png/fixtures/xdtn0g01.png
 create mode 100644 test/png/fixtures/xhdn0g08.png
 create mode 100644 test/png/fixtures/xlfn0g04.png
 create mode 100644 test/png/fixtures/xs1n0g01.png
 create mode 100644 test/png/fixtures/xs2n0g01.png
 create mode 100644 test/png/fixtures/xs4n0g01.png
 create mode 100644 test/png/fixtures/xs7n0g01.png
 create mode 100644 test/png/fixtures/z00n2c08.png
 create mode 100644 test/png/fixtures/z03n2c08.png
 create mode 100644 test/png/fixtures/z06n2c08.png
 create mode 100644 test/png/fixtures/z09n2c08.png
 create mode 100644 test/png/parsePng.test.ts
 create mode 100644 types/png.d.ts

diff --git a/public/common/bytes.js b/public/common/bytes.js
new file mode 100644
index 0000000..7337a73
--- /dev/null
+++ b/public/common/bytes.js
@@ -0,0 +1,28 @@
+// @ts-check
+
+/**
+ * @param {Uint8Array} a
+ * @param {Uint8Array} b
+ * @returns {boolean}
+ */
+export const areBytesEqual = (a, b) => {
+  if (a.length !== b.length) return false;
+  for (let i = 0; i < a.length; i++) {
+    if (a[i] !== b[i]) return false;
+  }
+  return true;
+};
+
+/**
+ * @param {Uint8Array} bytes
+ * @param {number} size
+ * @returns {Uint8Array[]}
+ */
+export const chunkBytes = (bytes, size) => {
+  /** @type {Uint8Array[]} */
+  const result = [];
+  for (let i = 0; i < bytes.byteLength; i += size) {
+    result.push(bytes.subarray(i, i + size));
+  }
+  return result;
+};
diff --git a/public/png/constants.js b/public/png/constants.js
new file mode 100644
index 0000000..5f4ce5a
--- /dev/null
+++ b/public/png/constants.js
@@ -0,0 +1,99 @@
+// @ts-check
+
+/** @enum {string} */
+export const PngNodeType = [
+  "root",
+  "signature",
+
+  "unknownChunk",
+  "chunkLength",
+  "chunkType",
+  "chunkData",
+  "chunkCrc",
+
+  "ihdr",
+  "ihdrChunkData",
+  "ihdrWidth",
+  "ihdrHeight",
+  "ihdrBitDepth",
+  "ihdrColourType",
+  "ihdrCompressionMethod",
+  "ihdrFilterMethod",
+  "ihdrInterlaceMethod",
+
+  "plte",
+  "plteChunkData",
+  "plteColor",
+
+  "idat",
+  "idatChunkData",
+
+  "iend",
+  "iendChunkLength",
+
+  "trns",
+
+  "chrm",
+
+  "gama",
+
+  "iccp",
+
+  "sbit",
+
+  "srgb",
+
+  "cicp",
+
+  "text",
+  "textData",
+  "textKeyword",
+  "textNullSeparator",
+  "textString",
+
+  "ztxt",
+  "ztxtData",
+  "ztxtCompressionMethod",
+  "ztxtString",
+
+  "itxt",
+
+  "bkgd",
+
+  "hist",
+
+  "phys",
+
+  "splt",
+
+  "exif",
+
+  "time",
+
+  "actl",
+
+  "fctl",
+
+  "fdat",
+
+  "offs",
+
+  "pcal",
+
+  "scal",
+
+  "gifg",
+
+  "gifx",
+
+  "gift",
+
+  "ster",
+
+  "dsig",
+
+  "idot",
+].reduce((result, id) => {
+  result[id] = id;
+  return result;
+}, Object.create(null));
diff --git a/public/png/crc32.js b/public/png/crc32.js
new file mode 100644
index 0000000..37028be
--- /dev/null
+++ b/public/png/crc32.js
@@ -0,0 +1,28 @@
+// @ts-check
+
+/** * @type {number[]} */
+const crcTable = [];
+for (let i = 0; i < 256; i++) {
+  let b = i;
+  for (let j = 0; j < 8; j++) {
+    b = b & 1 ? 0xedb88320 ^ (b >>> 1) : b >>> 1;
+  }
+  crcTable[i] = b >>> 0;
+}
+
+/**
+ * Compute the CRC32 checksum of some `Uint8Array`s.
+ * @param {Uint8Array[]} uint8arrays
+ * @returns {number}
+ */
+export default (...uint8arrays) => {
+  let crc = -1;
+
+  for (const bytes of uint8arrays) {
+    for (let i = 0; i < bytes.length; i++) {
+      crc = crcTable[(crc ^ bytes[i]) & 0xff] ^ (crc >>> 8);
+    }
+  }
+
+  return (crc ^ -1) >>> 0;
+};
diff --git a/public/png/index.html b/public/png/index.html
index 786effd..a83c846 100644
--- a/public/png/index.html
+++ b/public/png/index.html
@@ -11,7 +11,7 @@
   <meta name="viewport" content="width=device-width, initial-scale=1">
 </head>
 <body>
-  <div id="error" hidden></div>
+  <div id="error" hidden>Failed to parse PNG</div>
   <div id="explorer" hidden>
     <div id="bytesEl"></div>
     <div id="treeEl"></div>
diff --git a/public/png/parsePng.js b/public/png/parsePng.js
new file mode 100644
index 0000000..d7dda03
--- /dev/null
+++ b/public/png/parsePng.js
@@ -0,0 +1,305 @@
+// @ts-check
+
+import { PngNodeType } from "./constants.js";
+import { areBytesEqual, chunkBytes } from "../common/bytes.js";
+import crc32 from "./crc32.js";
+
+/** @typedef {import("../../types/png.d.ts").Node<PngNodeType>} PngNode */
+
+const PNG_SIGNATURE = new Uint8Array([137, 80, 78, 71, 13, 10, 26, 10]);
+
+const textDecoder = new TextDecoder();
+
+/**
+ * @param {Uint8Array} bytes
+ * @returns {null | PngNode} The root node of the PNG tree, or null if the PNG is invalid.
+ */
+export default (bytes) => {
+  if (!isSignatureValid(bytes)) {
+    console.warn("Invalid PNG signature");
+    return null;
+  }
+
+  /** @type {PngNode[]} */
+  const children = [{ type: PngNodeType.signature, bytes: PNG_SIGNATURE }];
+
+  const view = new DataView(bytes.buffer, bytes.byteOffset, bytes.byteLength);
+
+  for (let i = PNG_SIGNATURE.length; i < bytes.length;) {
+    const lengthBytes = bytes.subarray(i, i + 4);
+    if (lengthBytes.byteLength !== 4) {
+      console.warn("Invalid data. Did the file end too early?");
+      return null;
+    }
+    const length = view.getUint32(i);
+    i += 4;
+
+    const typeBytes = bytes.subarray(i, i + 4);
+    const type = parseType(typeBytes);
+    if (!type) {
+      console.warn("Invalid chunk type)");
+      return null;
+    }
+    i += 4;
+
+    const data = bytes.subarray(i, i + length);
+    if (data.length !== length) {
+      console.warn("Invalid data. Did the file end too early?");
+      return null;
+    }
+    i += length;
+
+    const actualCrcBytes = bytes.subarray(i, i + 4);
+    if (actualCrcBytes.length !== 4) {
+      console.warn("Not enough bytes for the CRC. Did the file end too early?");
+      return null;
+    }
+    const actualCrc = view.getUint32(i);
+    const expectedCrc = crc32(typeBytes, data);
+    if (actualCrc !== expectedCrc) {
+      console.warn("Invalid chunk CRC");
+      return null;
+    }
+    i += 4;
+
+    const allBytes = bytes.subarray(i - length - 12, i);
+
+    children.push(
+      formatChunk(allBytes, lengthBytes, typeBytes, data, actualCrcBytes),
+    );
+  }
+
+  return { type: PngNodeType.root, bytes, children };
+};
+
+/**
+ * @param {Uint8Array} bytes
+ * @returns {boolean}
+ */
+const isSignatureValid = (bytes) =>
+  areBytesEqual(bytes.subarray(0, 8), PNG_SIGNATURE);
+
+/**
+ * @param {Uint8Array} bytes
+ * @returns {null | string} The chunk type, or null if the chunk type is invalid.
+ */
+const parseType = (bytes) => {
+  if (bytes.length !== 4) return null;
+  const result = textDecoder.decode(bytes);
+  if (!/^[A-Za-z]{4}$/.test(result)) return null;
+  return result;
+};
+
+/**
+ * @param {Uint8Array} allBytes All the bytes in the chunk.
+ * @param {Uint8Array} lengthBytes
+ * @param {Uint8Array} typeBytes
+ * @param {Uint8Array} data
+ * @param {Uint8Array} crcBytes
+ * @returns {PngNode}
+ */
+const formatChunk = (allBytes, lengthBytes, typeBytes, data, crcBytes) => {
+  /** @type {PngNodeType} */
+  let type = PngNodeType.unknownChunk;
+
+  /** @type {PngNode} */
+  let chunkLengthNode = { type: PngNodeType.chunkLength, bytes: lengthBytes };
+  /** @type {PngNode} */
+  const chunkTypeNode = { type: PngNodeType.chunkType, bytes: typeBytes };
+  /** @type {PngNode} */
+  let chunkDataNode = { type: PngNodeType.chunkData, bytes: data };
+  /** @type {PngNode} */
+  const chunkCrcNode = { type: PngNodeType.chunkCrc, bytes: crcBytes };
+
+  switch (textDecoder.decode(typeBytes)) {
+    case "IHDR":
+      type = PngNodeType.ihdr;
+      chunkDataNode = {
+        ...chunkDataNode,
+        type: PngNodeType.ihdrChunkData,
+        children: [
+          { type: PngNodeType.ihdrWidth, bytes: data.subarray(0, 4) },
+          { type: PngNodeType.ihdrHeight, bytes: data.subarray(4, 8) },
+          { type: PngNodeType.ihdrBitDepth, bytes: data.subarray(8, 9) },
+          { type: PngNodeType.ihdrColourType, bytes: data.subarray(9, 10) },
+          {
+            type: PngNodeType.ihdrCompressionMethod,
+            bytes: data.subarray(10, 11),
+          },
+          { type: PngNodeType.ihdrFilterMethod, bytes: data.subarray(11, 12) },
+          {
+            type: PngNodeType.ihdrInterlaceMethod,
+            bytes: data.subarray(12, 13),
+          },
+        ],
+      };
+      break;
+    case "PLTE":
+      type = PngNodeType.plte;
+      chunkDataNode = {
+        ...chunkDataNode,
+        type: PngNodeType.plteChunkData,
+        children: chunkBytes(data, 3).map((bytes) => ({
+          type: PngNodeType.plteColor,
+          bytes,
+        })),
+      };
+      break;
+    case "IDAT":
+      type = PngNodeType.idat;
+      chunkDataNode = { ...chunkDataNode, type: PngNodeType.idatChunkData };
+      break;
+    case "IEND":
+      type = PngNodeType.iend;
+      chunkLengthNode = {
+        ...chunkLengthNode,
+        type: PngNodeType.iendChunkLength,
+      };
+      break;
+    case "tRNS":
+      type = PngNodeType.trns;
+      break;
+    case "cHRM":
+      type = PngNodeType.chrm;
+      break;
+    case "gAMA":
+      type = PngNodeType.gama;
+      break;
+    case "iCCP":
+      type = PngNodeType.iccp;
+      break;
+    case "sBIT":
+      type = PngNodeType.sbit;
+      break;
+    case "sRGB":
+      type = PngNodeType.srgb;
+      break;
+    case "cICP":
+      type = PngNodeType.cicp;
+      break;
+    case "tEXt": {
+      type = PngNodeType.text;
+      const nullSeparatorIndex = data.indexOf(0);
+      if (nullSeparatorIndex === -1) break;
+      chunkDataNode = {
+        ...chunkDataNode,
+        type: PngNodeType.textData,
+        children: [
+          {
+            type: PngNodeType.textKeyword,
+            bytes: data.subarray(0, nullSeparatorIndex),
+          },
+          {
+            type: PngNodeType.textNullSeparator,
+            bytes: data.subarray(nullSeparatorIndex, nullSeparatorIndex + 1),
+          },
+          {
+            type: PngNodeType.textString,
+            bytes: data.subarray(nullSeparatorIndex + 1),
+          },
+        ],
+      };
+      break;
+    }
+    case "zTXt": {
+      type = PngNodeType.ztxt;
+      const nullSeparatorIndex = data.indexOf(0);
+      if (nullSeparatorIndex === -1) break;
+      chunkDataNode = {
+        ...chunkDataNode,
+        type: PngNodeType.ztxtData,
+        children: [
+          {
+            type: PngNodeType.textKeyword,
+            bytes: data.subarray(0, nullSeparatorIndex),
+          },
+          {
+            type: PngNodeType.textNullSeparator,
+            bytes: data.subarray(nullSeparatorIndex, nullSeparatorIndex + 1),
+          },
+          {
+            type: PngNodeType.ztxtCompressionMethod,
+            bytes: data.subarray(
+              nullSeparatorIndex + 1,
+              nullSeparatorIndex + 2,
+            ),
+          },
+          {
+            type: PngNodeType.ztxtString,
+            bytes: data.subarray(nullSeparatorIndex + 2),
+          },
+        ],
+      };
+      break;
+    }
+    case "iTXt":
+      type = PngNodeType.itxt;
+      break;
+    case "bKGD":
+      type = PngNodeType.bkgd;
+      break;
+    case "hIST":
+      type = PngNodeType.hist;
+      break;
+    case "pHYs":
+      type = PngNodeType.phys;
+      break;
+    case "sPLT":
+      type = PngNodeType.splt;
+      break;
+    case "eXIf":
+      type = PngNodeType.exif;
+      break;
+    case "tIME":
+      type = PngNodeType.time;
+      break;
+    case "acTL":
+      type = PngNodeType.actl;
+      break;
+    case "fcTL":
+      type = PngNodeType.fctl;
+      break;
+    case "fdAT":
+      type = PngNodeType.fdat;
+      break;
+    case "oFFs":
+      type = PngNodeType.offs;
+      break;
+    case "pCAL":
+      type = PngNodeType.pcal;
+      break;
+    case "sCAL":
+      type = PngNodeType.scal;
+      break;
+    case "gIFg":
+      type = PngNodeType.gifg;
+      break;
+    case "gIFx":
+      type = PngNodeType.gifx;
+      break;
+    case "gIFt":
+      type = PngNodeType.gift;
+      break;
+    case "sTER":
+      type = PngNodeType.ster;
+      break;
+    case "dSIG":
+      type = PngNodeType.dsig;
+      break;
+    case "iDOT":
+      type = PngNodeType.idot;
+      break;
+    default:
+      console.warn(`Unknown chunk type ${type}`);
+      break;
+  }
+
+  /** @type {PngNode[]} */
+  const children = [];
+  children.push(chunkLengthNode);
+  children.push(chunkTypeNode);
+  if (data.byteLength) children.push(chunkDataNode);
+  children.push(chunkCrcNode);
+
+  return { type, bytes: allBytes, children };
+};
diff --git a/public/png/png.js b/public/png/png.js
index 05eb284..e771cf4 100644
--- a/public/png/png.js
+++ b/public/png/png.js
@@ -1,5 +1,7 @@
 // @ts-check
 
+import parsePng from "./parsePng.js";
+
 import parseHash from "./parseHash.js";
 
 const errorEl = document.getElementById("error");
@@ -14,8 +16,17 @@ const main = () => {
     return;
   }
 
+  const { bytes } = parsedHash;
+
+  const rootNode = parsePng(bytes);
+  if (!rootNode) {
+    // TODO: Is there better UI than this?
+    errorEl.removeAttribute("hidden");
+    return;
+  }
+
   // TODO: Actually do something!
-  console.log(parsedHash);
+  console.log(rootNode);
 };
 
 main();
diff --git a/test/common/base64url.test.ts b/test/common/base64url.test.ts
index d881f53..c4dcf90 100644
--- a/test/common/base64url.test.ts
+++ b/test/common/base64url.test.ts
@@ -1,11 +1,7 @@
 import { assertEquals } from "assert";
+import { b } from "../helpers.ts";
 import * as base64url from "../../public/common/base64url.js";
 
-/**
- * A shorthand for `new Uint8Array()`.
- */
-const b = (...bytes: number[]) => new Uint8Array(bytes);
-
 Deno.test('encodes no bytes as ""', () => {
   assertEquals(base64url.stringify(b()), "");
 });
diff --git a/test/common/bytes.test.ts b/test/common/bytes.test.ts
new file mode 100644
index 0000000..01d1a99
--- /dev/null
+++ b/test/common/bytes.test.ts
@@ -0,0 +1,20 @@
+import { assert, assertEquals } from "assert";
+import { b } from "../helpers.ts";
+import { areBytesEqual, chunkBytes } from "../../public/common/bytes.js";
+
+Deno.test("areBytesEqual", () => {
+  const x = b(1, 2);
+  const y = b(1, 2, 3);
+  const z = b(1, 2, 3);
+
+  assert(areBytesEqual(x, x));
+  assert(areBytesEqual(y, z));
+  assert(!areBytesEqual(x, y));
+});
+
+Deno.test("chunkBytes", () => {
+  assertEquals(
+    chunkBytes(b(1, 2, 3, 4, 5, 6, 7, 8), 3),
+    [b(1, 2, 3), b(4, 5, 6), b(7, 8)],
+  );
+});
diff --git a/test/helpers.ts b/test/helpers.ts
new file mode 100644
index 0000000..a30eb38
--- /dev/null
+++ b/test/helpers.ts
@@ -0,0 +1,25 @@
+import { stub } from "mock";
+
+/**
+ * A shorthand for `new Uint8Array()`.
+ */
+export const b = (...bytes: number[]) => new Uint8Array(bytes);
+
+/**
+ * @example
+ * Deno.test("works", stubbingWarn(() => {
+ *   // ...
+ * }));
+ */
+export const stubbingWarn = (
+  fn: (t: Deno.TestContext) => void | Promise<void>,
+): (t: Deno.TestContext) => Promise<void> => (
+  async (t) => {
+    const warnStub = stub(console, "warn");
+    try {
+      return await fn(t);
+    } finally {
+      warnStub.restore();
+    }
+  }
+);
diff --git a/test/png/crc32.test.ts b/test/png/crc32.test.ts
new file mode 100644
index 0000000..07f2aa5
--- /dev/null
+++ b/test/png/crc32.test.ts
@@ -0,0 +1,21 @@
+import { assertEquals } from "assert";
+import { b } from "../helpers.ts";
+import crc32 from "../../public/png/crc32.js";
+
+Deno.test("computes CRC32s", () => {
+  // These tests are lifted from the following Go 1.19.3 code:
+  //
+  // ```
+  // crc := crc32.NewIEEE()
+  // fmt.Println(crc.Sum32())
+  // crc.Write([]byte{})
+  // fmt.Println(crc.Sum32())
+  // crc.Write([]byte{1, 2, 3})
+  // fmt.Println(crc.Sum32())
+  // crc.Write([]byte{4, 5, 6})
+  // fmt.Println(crc.Sum32())
+  // ```
+  assertEquals(crc32(), 0);
+  assertEquals(crc32(b(1, 2, 3)), 1438416925);
+  assertEquals(crc32(b(1, 2, 3, 4, 5, 6)), 2180413220);
+});
diff --git a/test/png/fixtures/basi0g01.png b/test/png/fixtures/basi0g01.png
new file mode 100644
index 0000000000000000000000000000000000000000..556fa72704084920c07066054bb57adc5a250b27
GIT binary patch
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diff --git a/test/png/fixtures/basi0g02.png b/test/png/fixtures/basi0g02.png
new file mode 100644
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diff --git a/test/png/fixtures/basi0g04.png b/test/png/fixtures/basi0g04.png
new file mode 100644
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diff --git a/test/png/fixtures/basi0g08.png b/test/png/fixtures/basi0g08.png
new file mode 100644
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GIT binary patch
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diff --git a/test/png/fixtures/basi0g16.png b/test/png/fixtures/basi0g16.png
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diff --git a/test/png/fixtures/g07n3p04.png b/test/png/fixtures/g07n3p04.png
new file mode 100644
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GIT binary patch
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literal 0
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diff --git a/test/png/fixtures/g10n0g16.png b/test/png/fixtures/g10n0g16.png
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GIT binary patch
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literal 0
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diff --git a/test/png/fixtures/g10n2c08.png b/test/png/fixtures/g10n2c08.png
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GIT binary patch
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literal 0
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diff --git a/test/png/fixtures/g10n3p04.png b/test/png/fixtures/g10n3p04.png
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GIT binary patch
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literal 0
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diff --git a/test/png/fixtures/g25n0g16.png b/test/png/fixtures/g25n0g16.png
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GIT binary patch
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literal 0
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diff --git a/test/png/fixtures/g25n2c08.png b/test/png/fixtures/g25n2c08.png
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GIT binary patch
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literal 0
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diff --git a/test/png/fixtures/g25n3p04.png b/test/png/fixtures/g25n3p04.png
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GIT binary patch
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literal 0
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diff --git a/test/png/fixtures/oi1n0g16.png b/test/png/fixtures/oi1n0g16.png
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GIT binary patch
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literal 0
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diff --git a/test/png/fixtures/oi1n2c16.png b/test/png/fixtures/oi1n2c16.png
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GIT binary patch
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literal 0
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diff --git a/test/png/fixtures/oi2n0g16.png b/test/png/fixtures/oi2n0g16.png
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GIT binary patch
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literal 0
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diff --git a/test/png/fixtures/oi2n2c16.png b/test/png/fixtures/oi2n2c16.png
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GIT binary patch
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diff --git a/test/png/fixtures/oi4n0g16.png b/test/png/fixtures/oi4n0g16.png
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GIT binary patch
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literal 0
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diff --git a/test/png/fixtures/oi4n2c16.png b/test/png/fixtures/oi4n2c16.png
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GIT binary patch
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literal 0
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diff --git a/test/png/fixtures/oi9n0g16.png b/test/png/fixtures/oi9n0g16.png
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GIT binary patch
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literal 0
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diff --git a/test/png/fixtures/oi9n2c16.png b/test/png/fixtures/oi9n2c16.png
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GIT binary patch
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literal 0
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diff --git a/test/png/fixtures/pp0n2c16.png b/test/png/fixtures/pp0n2c16.png
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GIT binary patch
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diff --git a/test/png/fixtures/tp0n0g08.png b/test/png/fixtures/tp0n0g08.png
new file mode 100644
index 0000000000000000000000000000000000000000..333465fcdc9f10f7f25b2d999b558f5421983ecc
GIT binary patch
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literal 0
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diff --git a/test/png/fixtures/tp0n2c08.png b/test/png/fixtures/tp0n2c08.png
new file mode 100644
index 0000000000000000000000000000000000000000..fc6e42cb420fd08ecd78340256157fa5f8a22934
GIT binary patch
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literal 0
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diff --git a/test/png/fixtures/tp0n3p08.png b/test/png/fixtures/tp0n3p08.png
new file mode 100644
index 0000000000000000000000000000000000000000..69a69e5872234d96cab4cbb017a0933fbfedba81
GIT binary patch
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literal 0
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diff --git a/test/png/fixtures/tp1n3p08.png b/test/png/fixtures/tp1n3p08.png
new file mode 100644
index 0000000000000000000000000000000000000000..a6c9f35a86271c056e955f637a8769381eb03827
GIT binary patch
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literal 0
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diff --git a/test/png/fixtures/xc1n0g08.png b/test/png/fixtures/xc1n0g08.png
new file mode 100644
index 0000000000000000000000000000000000000000..940422737011509e21d5c02e879c643a83d360e6
GIT binary patch
literal 138
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literal 0
HcmV?d00001

diff --git a/test/png/fixtures/xc9n2c08.png b/test/png/fixtures/xc9n2c08.png
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GIT binary patch
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literal 0
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diff --git a/test/png/fixtures/xcrn0g04.png b/test/png/fixtures/xcrn0g04.png
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GIT binary patch
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literal 0
HcmV?d00001

diff --git a/test/png/fixtures/xcsn0g01.png b/test/png/fixtures/xcsn0g01.png
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GIT binary patch
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literal 0
HcmV?d00001

diff --git a/test/png/fixtures/xd0n2c08.png b/test/png/fixtures/xd0n2c08.png
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GIT binary patch
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literal 0
HcmV?d00001

diff --git a/test/png/fixtures/xd3n2c08.png b/test/png/fixtures/xd3n2c08.png
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GIT binary patch
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literal 0
HcmV?d00001

diff --git a/test/png/fixtures/xd9n2c08.png b/test/png/fixtures/xd9n2c08.png
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GIT binary patch
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literal 0
HcmV?d00001

diff --git a/test/png/fixtures/xdtn0g01.png b/test/png/fixtures/xdtn0g01.png
new file mode 100644
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GIT binary patch
literal 61
zcmeAS@N?(olHy`uVBq!ia0vp^3Lwk~Bp9L@-6Me%OS+@4BLidG0>c;6;z8n`u6{1-
HoD!M<9fb>g

literal 0
HcmV?d00001

diff --git a/test/png/fixtures/xhdn0g08.png b/test/png/fixtures/xhdn0g08.png
new file mode 100644
index 0000000000000000000000000000000000000000..fcb8737fa2505b43955e995d95c3d6972b85fe32
GIT binary patch
literal 138
zcmeAS@N?(olHy`uVBq!ia0vp^3Lwk@Bp957Lw$i1OS+@4BLidG0>c;6;(>fePZ!6K
ziaE(C2`UUC949vOu(I~>b7=nfE^nVuX&@tFa7u7Oddi~87#=p(p8gM~{{27yqy1T-
hp#)Io!PL|g7KVVQ{|ZeX-G~HP;_2$=vd$@?2>>eWDsTV*

literal 0
HcmV?d00001

diff --git a/test/png/fixtures/xlfn0g04.png b/test/png/fixtures/xlfn0g04.png
new file mode 100644
index 0000000000000000000000000000000000000000..d9ec53ed94b34f50eeabf3029465e1106725ea2a
GIT binary patch
literal 145
zcmeAS@N?(llHy`uVBqrfa0vp^3Lwk^Bp4<?JfR7sSkfJR9T^zg78t&m77yfmc)B=-
zRLn_ENDvSS2{JM(E9B(z_14x;S8!&Sdi$bdAA?r;GoK=sfSs$uCMq|ay1RF_3}eW<
qnZ{2z78Jd|r|Qly_4hkjNhSt)k#~%*{yY8x+2!f#=d#Wzp$P!Npe<hj

literal 0
HcmV?d00001

diff --git a/test/png/fixtures/xs1n0g01.png b/test/png/fixtures/xs1n0g01.png
new file mode 100644
index 0000000000000000000000000000000000000000..1817c5144ffa1644cabc5fd86b73bb93ef0de064
GIT binary patch
literal 164
zcmd-K@N?(olHy`uVBq!ia0vp^3Lwk~Bp9L@-6Me%OS+@4BLidG0>c;6;z7cmE{-7;
zb9B#a<YYGBVZHeJ63Zqp1@0=7{0X8qO$U3q5?$E?KR)QvU-jzJl9rrvD^-Kpo(G$R
z3q2Ctq`2Q(%~sl}SXDKy`_`s;`B|q7GWF(aCg#1&H%R@kUtXZyQ~!d#$Vrg(p00i_
I>zopr048WOXaE2J

literal 0
HcmV?d00001

diff --git a/test/png/fixtures/xs2n0g01.png b/test/png/fixtures/xs2n0g01.png
new file mode 100644
index 0000000000000000000000000000000000000000..b8147f2a84b861b559fd52fc0ded6971debdc6f1
GIT binary patch
literal 164
zcmeAS^mFIslHy`uVBq!ia0vp^3Lwk~Bp9L@-6Me%OS+@4BLidG0>c;6;z7cmE{-7;
zb9B#a<YYGBVZHeJ63Zqp1@0=7{0X8qO$U3q5?$E?KR)QvU-jzJl9rrvD^-Kpo(G$R
z3q2Ctq`2Q(%~sl}SXDKy`_`s;`B|q7GWF(aCg#1&H%R@kUtXZyQ~!d#$Vrg(p00i_
I>zopr0C@{E=>Px#

literal 0
HcmV?d00001

diff --git a/test/png/fixtures/xs4n0g01.png b/test/png/fixtures/xs4n0g01.png
new file mode 100644
index 0000000000000000000000000000000000000000..45237a1d294f7432c06ae45769727d9745250221
GIT binary patch
literal 164
zcmeAS@Jr|AlHy`uVBq!ia0vp^3Lwk~Bp9L@-6Me%OS+@4BLidG0>c;6;z7cmE{-7;
zb9B#a<YYGBVZHeJ63Zqp1@0=7{0X8qO$U3q5?$E?KR)QvU-jzJl9rrvD^-Kpo(G$R
z3q2Ctq`2Q(%~sl}SXDKy`_`s;`B|q7GWF(aCg#1&H%R@kUtXZyQ~!d#$Vrg(p00i_
I>zopr0E~z=2mk;8

literal 0
HcmV?d00001

diff --git a/test/png/fixtures/xs7n0g01.png b/test/png/fixtures/xs7n0g01.png
new file mode 100644
index 0000000000000000000000000000000000000000..3f307f14ea5ed37b9f74b896a98ee4a5d2c9e111
GIT binary patch
literal 164
zcmeAS@N?(oQs81>VBq!ia0vp^3Lwk~Bp9L@-6Me%OS+@4BLidG0>c;6;z7cmE{-7;
zb9B#a<YYGBVZHeJ63Zqp1@0=7{0X8qO$U3q5?$E?KR)QvU-jzJl9rrvD^-Kpo(G$R
z3q2Ctq`2Q(%~sl}SXDKy`_`s;`B|q7GWF(aCg#1&H%R@kUtXZyQ~!d#$Vrg(p00i_
I>zopr0DK%Y?f?J)

literal 0
HcmV?d00001

diff --git a/test/png/fixtures/z00n2c08.png b/test/png/fixtures/z00n2c08.png
new file mode 100644
index 0000000000000000000000000000000000000000..7669eb8385172325c399f3229cfe834f886fecb2
GIT binary patch
literal 3172
zcmeAS@N?(olHy`uVBq!ia0vp^3LwnE1SJ1Ryj{$|z@zQy;uunKi&25+{%6Mj{~3NT
zfY5g^iOI$zg{%daG8T~8Gz1(pwSa?x0cZixpELm=(-{~zY2*W_>0lpFKMoM4)4~E2
z)2SW@=%!OQ4zQR`#UR3NI<+joX*yLbz-Kz;kxamJ3L}}Y>68Q!QKpk^0kNi&7Y8Jm
zPDUJ%W;&@sM6&55SwN2I#K!@drV|+l<eN@R5K&}0K?^7~9lr%sFda`MQ^#~%kxVty
zu?7(}O~<r=%BG{m0rgEsjsu#Q4i6$)nGUodbh2Nbyzqyqp!Tn)tDnm{r-UW|A%9;m

literal 0
HcmV?d00001

diff --git a/test/png/fixtures/z03n2c08.png b/test/png/fixtures/z03n2c08.png
new file mode 100644
index 0000000000000000000000000000000000000000..bfb10de8de4f842b03efb9ea45798a67bc72d4c6
GIT binary patch
literal 232
zcmV<E02lv>P)<h;3K|Lk000e1NJLTq001BW001Be0ssI2{21+{00025Nkl<ZcwV*9
z-3~x73<cmyT=4!6%iU}u3|rTq(?vvr@1#9bO0-kCw)6gfW?t35^gf#l8F-e^fQ2Xr
z<T*o5(TUce2`>Gd0N=r*M+Cfdcn4n{+d)GIuBfe}0=haRfYbdY4|HeAW8JeNk!}u<
z>b4FPx}gJ|u3eE@R|Qyfc?U*a*nwS_tjMJg1H3vP0MMC|F?z3LnBH6wQvU~l^-l+Q
iz3w1HzgHBc=YRuMlTL2m+d~-u0000<MNUMnLSTYWIbK8n

literal 0
HcmV?d00001

diff --git a/test/png/fixtures/z06n2c08.png b/test/png/fixtures/z06n2c08.png
new file mode 100644
index 0000000000000000000000000000000000000000..b90ebc10f5b01829fe5e322c5b585b8c27090641
GIT binary patch
literal 224
zcmeAS@N?(olHy`uVBq!ia0vp^3LwnE1SJ1Ryj={WmV3H5hE&YideNJ&K|z4|!mJGk
ze#?uM?J%qpNVJm;SDAGELf+biOrjbV{C6uqc^By}RQhy!A*198PSpVRZwtidR0X(h
zmlOPO>811+tMcYXzcm?aHZ#?gdL8ij-oNL<T;=tp{;o=QWfZRFN^6uHX0wWoo){I*
z8d36-%`J9EW9;;hCzqx(#?{I>Tu@go{<42!=C2J(%l`2yyuQm;^LM9XM_s7MQs$ow
Yp_Bdc41*5p0G-U>>FVdQ&MBb@0O=}Ly8r+H

literal 0
HcmV?d00001

diff --git a/test/png/fixtures/z09n2c08.png b/test/png/fixtures/z09n2c08.png
new file mode 100644
index 0000000000000000000000000000000000000000..5f191a78ee5601a45f1add2a3ad7a77b7b1ae0f1
GIT binary patch
literal 224
zcmeAS@N?(olHy`uVBq!ia0vp^3LwnE1SJ1Ryj={WmV3H5hE&|zdeNJ&K|z4|!mJGk
ze#?uM?J%qpNVJm;SDAGELf+biOrjbV{C6uqc^By}RQhy!A*198PSpVRZwtidR0X(h
zmlOPO>811+tMcYXzcm?aHZ#?gdL8ij-oNL<T;=tp{;o=QWfZRFN^6uHX0wWoo){I*
z8d36-%`J9EW9;;hCzqx(#?{I>Tu@go{<42!=C2J(%l`2yyuQm;^LM9XM_s7MQs$ow
Yp_Bdct_kk@3Uo4qr>mdKI;Vst043R2BLDyZ

literal 0
HcmV?d00001

diff --git a/test/png/parseHash.test.ts b/test/png/parseHash.test.ts
index 953754f..de67f47 100644
--- a/test/png/parseHash.test.ts
+++ b/test/png/parseHash.test.ts
@@ -1,22 +1,21 @@
 import { assertEquals } from "assert";
-import { stub } from "mock";
+import { stubbingWarn } from "../helpers.ts";
 import parseHash from "../../public/png/parseHash.js";
 
-Deno.test("returns null if hash cannot be parsed", () => {
-  const testCases = [
-    // Missing fields
-    "#null",
-    "#{}",
-    "#{%22name%22:%22image.png%22}",
-    "#{%22bytes%22:%22AQID%22}",
-    // Invalid JSON
-    "",
-    "#{%22name%22:%22small.png%22,%22bytes%22:%22iAQID",
-  ];
+Deno.test(
+  "returns null if hash cannot be parsed",
+  stubbingWarn(() => {
+    const testCases = [
+      // Missing fields
+      "#null",
+      "#{}",
+      "#{%22name%22:%22image.png%22}",
+      "#{%22bytes%22:%22AQID%22}",
+      // Invalid JSON
+      "",
+      "#{%22name%22:%22small.png%22,%22bytes%22:%22iAQID",
+    ];
 
-  const warnStub = stub(console, "warn");
-
-  try {
     for (const testCase of testCases) {
       assertEquals(
         parseHash(testCase),
@@ -24,10 +23,8 @@ Deno.test("returns null if hash cannot be parsed", () => {
         `Parsing ${testCase} should fail`,
       );
     }
-  } finally {
-    warnStub.restore();
-  }
-});
+  }),
+);
 
 Deno.test("parses hashes", () => {
   const hash = "#{%22name%22:%22small.png%22,%22bytes%22:%22AQID%22}";
diff --git a/test/png/parsePng.test.ts b/test/png/parsePng.test.ts
new file mode 100644
index 0000000..00172c7
--- /dev/null
+++ b/test/png/parsePng.test.ts
@@ -0,0 +1,124 @@
+import { assert, assertEquals } from "assert";
+import { b, stubbingWarn } from "../helpers.ts";
+import { PngNodeType } from "../../public/png/constants.js";
+import parsePng from "../../public/png/parsePng.js";
+
+const FIXTURES_URL = new URL("./fixtures/", import.meta.url);
+
+const getFixture = (name: string): Promise<Uint8Array> =>
+  Deno.readFile(new URL(name, FIXTURES_URL));
+
+async function* getFixtureNames(): AsyncIterable<string> {
+  for await (const dirEntry of Deno.readDir(FIXTURES_URL)) {
+    if (!dirEntry.isFile) continue;
+    const { name } = dirEntry;
+    if (name.endsWith(".png")) yield name;
+  }
+}
+
+const t = (type: string) => new TextEncoder().encode(type);
+
+Deno.test(
+  "parses PNG test suite reasonably",
+  stubbingWarn(async () => {
+    const fixturesToSkip = new Set([
+      // Incorrect bit depths, which we don't detect.
+      "xd0n2c08.png",
+      "xd3n2c08.png",
+      "xd9n2c08.png",
+      // Incorrect color types, which we don't detect.
+      "xc1n0g08.png",
+      "xc9n2c08.png",
+      // Missing an IDAT chunk, which we don't detect.
+      "xdtn0g01.png",
+    ]);
+
+    for await (const fixtureName of getFixtureNames()) {
+      const fixture = await getFixture(fixtureName);
+
+      if (fixturesToSkip.has(fixtureName)) continue;
+
+      if (fixtureName.startsWith("x")) {
+        assertEquals(
+          parsePng(fixture),
+          null,
+          `${fixtureName} should fail to parse`,
+        );
+      } else {
+        try {
+          parsePng(fixture);
+        } catch {
+          assert(false, `${fixtureName} should parse`);
+        }
+      }
+    }
+  }),
+);
+
+Deno.test("parses a basic PNG", async () => {
+  const fixture = await getFixture("basn2c16.png");
+  assertEquals(parsePng(fixture), {
+    type: PngNodeType.root,
+    bytes: fixture,
+    children: [
+      {
+        type: PngNodeType.signature,
+        bytes: fixture.subarray(0, 8),
+      },
+      {
+        type: PngNodeType.ihdr,
+        bytes: fixture.subarray(8, 8 + 25),
+        children: [
+          { type: PngNodeType.chunkLength, bytes: b(0, 0, 0, 13) },
+          { type: PngNodeType.chunkType, bytes: t("IHDR") },
+          {
+            type: PngNodeType.ihdrChunkData,
+            bytes: fixture.subarray(16, 16 + 13),
+            children: [
+              { type: PngNodeType.ihdrWidth, bytes: b(0, 0, 0, 32) },
+              { type: PngNodeType.ihdrHeight, bytes: b(0, 0, 0, 32) },
+              { type: PngNodeType.ihdrBitDepth, bytes: b(16) },
+              { type: PngNodeType.ihdrColourType, bytes: b(2) },
+              { type: PngNodeType.ihdrCompressionMethod, bytes: b(0) },
+              { type: PngNodeType.ihdrFilterMethod, bytes: b(0) },
+              { type: PngNodeType.ihdrInterlaceMethod, bytes: b(0) },
+            ],
+          },
+          { type: PngNodeType.chunkCrc, bytes: b(172, 136, 49, 224) },
+        ],
+      },
+      {
+        type: PngNodeType.gama,
+        bytes: fixture.subarray(33, 33 + 16),
+        children: [
+          { type: PngNodeType.chunkLength, bytes: b(0, 0, 0, 4) },
+          { type: PngNodeType.chunkType, bytes: t("gAMA") },
+          { type: PngNodeType.chunkData, bytes: b(0, 1, 134, 160) },
+          { type: PngNodeType.chunkCrc, bytes: b(49, 232, 150, 95) },
+        ],
+      },
+      {
+        type: PngNodeType.idat,
+        bytes: fixture.subarray(49, 49 + 241),
+        children: [
+          { type: PngNodeType.chunkLength, bytes: b(0, 0, 0, 229) },
+          { type: PngNodeType.chunkType, bytes: t("IDAT") },
+          {
+            type: PngNodeType.idatChunkData,
+            bytes: fixture.subarray(57, 57 + 229),
+          },
+          { type: PngNodeType.chunkCrc, bytes: b(7, 187, 196, 236) },
+        ],
+      },
+      {
+        type: PngNodeType.iend,
+        bytes: fixture.subarray(290, 290 + 12),
+        children: [
+          { type: PngNodeType.iendChunkLength, bytes: b(0, 0, 0, 0) },
+          { type: PngNodeType.chunkType, bytes: t("IEND") },
+          { type: PngNodeType.chunkCrc, bytes: b(0xae, 0x42, 0x60, 0x82) },
+        ],
+      },
+    ],
+  });
+});
diff --git a/types/png.d.ts b/types/png.d.ts
new file mode 100644
index 0000000..e36223c
--- /dev/null
+++ b/types/png.d.ts
@@ -0,0 +1,19 @@
+export type Node<T> = {
+  /**
+   * The type of this node. Typically an enum specific to the format.
+   */
+  type: T;
+
+  /**
+   * The bytes that make up this node.
+   *
+   * It is highly encouraged to use `Uint8Array.prototype.subarray`,
+   * not `.slice`, to avoid copying the data.
+   */
+  bytes: Uint8Array;
+
+  /**
+   * Child nodes.
+   */
+  children?: ReadonlyArray<Node<T>>;
+};