[improvemnet] drop crc, Buffer dependency (#1673)

This PR incorporates a crc method from
https://github.com/alexgorbatchev/crc into the library, removing a peer
dependency on `buffer`. This was causing build errors in apps that did
not include the buffer library. (Our codebase included buffer because of
vsce.)

### Change Type

- [x] `patch`

### Release Notes

- [@tldraw/editor] Remove peer dependency on buffer.

packages/editor/package.json

@@ -56,7 +56,6 @@
 		"@use-gesture/react": "^10.2.27",
 		"canvas-size": "^1.2.6",
 		"classnames": "^2.3.2",
-		"crc": "^4.3.2",
 		"escape-string-regexp": "^5.0.0",
 		"eventemitter3": "^4.0.7",
 		"idb": "^7.1.1",
@@ -74,7 +73,6 @@
 		"@testing-library/jest-dom": "^5.16.5",
 		"@testing-library/react": "^14.0.0",
 		"@types/benchmark": "^2.1.2",
-		"@types/crc": "^3.8.0",
 		"@types/lodash.throttle": "^4.1.7",
 		"@types/lodash.uniq": "^4.5.7",
 		"@types/react-test-renderer": "^18.0.0",

packages/editor/src/lib/utils/crc.ts

@@ -0,0 +1,55 @@
+type BufferInput = string | ArrayBuffer | Buffer
+
+interface CRCCalculator<T = BufferInput | Uint8Array> {
+	(value: T, previous?: number): number
+}
+
+let TABLE: Array<number> | Int32Array = [
+	0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
+	0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
+	0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
+	0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
+	0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
+	0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
+	0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
+	0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
+	0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
+	0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
+	0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
+	0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
+	0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
+	0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
+	0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
+	0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
+	0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
+	0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
+	0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
+	0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
+	0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
+	0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
+	0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
+	0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
+	0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
+	0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
+	0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
+	0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
+	0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
+	0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
+	0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
+	0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d,
+]
+
+if (typeof Int32Array !== 'undefined') {
+	TABLE = new Int32Array(TABLE)
+}
+
+// crc32, https://github.com/alexgorbatchev/crc/blob/master/src/calculators/crc32.ts
+export const crc: CRCCalculator<Uint8Array> = (current, previous) => {
+	let crc = previous === 0 ? 0 : ~~previous! ^ -1
+
+	for (let index = 0; index < current.length; index++) {
+		crc = TABLE[(crc ^ current[index]) & 0xff] ^ (crc >>> 8)
+	}
+
+	return crc ^ -1
+}

packages/editor/src/lib/utils/png.ts

@@ -1,4 +1,4 @@
-import crc32 from 'crc/crc32'
+import { crc } from './crc'
 
 export function isPng(view: DataView, offset: number) {
 	if (
@@ -25,10 +25,6 @@ function getChunkType(view: DataView, offset: number) {
 	].join('')
 }
 
-export function crc(arrayBuffer: ArrayBuffer) {
-	return crc32(arrayBuffer)
-}
-
 const LEN_SIZE = 4
 const CRC_SIZE = 4
 

public-yarn.lock

@@ -4217,7 +4217,6 @@ __metadata:
     "@tldraw/validate": "workspace:*"
     "@types/benchmark": ^2.1.2
     "@types/canvas-size": ^1.2.0
-    "@types/crc": ^3.8.0
     "@types/lodash.throttle": ^4.1.7
     "@types/lodash.uniq": ^4.5.7
     "@types/react-test-renderer": ^18.0.0
@@ -4226,7 +4225,6 @@ __metadata:
     benchmark: ^2.1.4
     canvas-size: ^1.2.6
     classnames: ^2.3.2
-    crc: ^4.3.2
     escape-string-regexp: ^5.0.0
     eventemitter3: ^4.0.7
     fake-indexeddb: ^4.0.0
@@ -4669,15 +4667,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@types/crc@npm:^3.8.0":
-  version: 3.8.0
-  resolution: "@types/crc@npm:3.8.0"
-  dependencies:
-    "@types/node": "*"
-  checksum: bcf040c3026ec812f4ac87423f42e7ef869483e8b87967184bd2bd26c9a9c358fce41217383adf83a36b53e821a608e784f6a973fd02192b540f55a5395c9180
-  languageName: node
-  linkType: hard
-
 "@types/debug@npm:^4.0.0":
   version: 4.1.7
   resolution: "@types/debug@npm:4.1.7"
@@ -7242,18 +7231,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"crc@npm:^4.3.2":
-  version: 4.3.2
-  resolution: "crc@npm:4.3.2"
-  peerDependencies:
-    buffer: ">=6.0.3"
-  peerDependenciesMeta:
-    buffer:
-      optional: true
-  checksum: 8231cc25331727083ffd22da3575110fc49b4dc8725de973bd43261d4426aba134ed3a75cc247f7c5e97a6e171f87dffc3325b82890e86d032de2e6bcef09c32
-  languageName: node
-  linkType: hard
-
 "create-require@npm:^1.1.0":
   version: 1.1.1
   resolution: "create-require@npm:1.1.1"