pw_web: Remove dependency on 'crc' and 'buffer' NPM packages

Change-Id: Ia1dace5389f4ec3006c567e162a14de5375d0885
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/160830
Commit-Queue: Asad Memon <[email protected]>
Reviewed-by: Anthony DiGirolamo <[email protected]>

package.json

@@ -43,8 +43,6 @@
     "ansi_up": "^5.1.0",
     "arg": "^5.0.2",
     "base64-js": "^1.5.1",
-    "buffer": "^6.0.3",
-    "crc": "^4.1.1",
     "debug": "^4.3.2",
     "eslint": "^7.30.0",
     "eslint-plugin-react": "^7.24.0",

pw_hdlc/ts/crc32.ts

@@ -0,0 +1,67 @@
+// Copyright 2023 The Pigweed Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not
+// use this file except in compliance with the License. You may obtain a copy of
+// the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+// License for the specific language governing permissions and limitations under
+// the License.
+
+/** Calculate CRC32 unsigned. Browser and NodeJS compatible version. */
+
+// Generated by pycrc (https://github.com/tpircher/pycrc) using
+// `./pycrc.py --algorithm=table-driven --model=crc-32 --generate=c`
+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);
+}
+
+export function crc32(bytes: Uint8Array): number {
+  let crc = 0xFFFFFFFF;
+  for (const byte of bytes) {
+    const tableIndex = (crc ^ byte) & 0xFF;
+    const tableVal = TABLE[tableIndex];
+    if (tableVal === undefined) throw new Error('tableIndex out of range 0-255');
+    crc = (crc >>> 8) ^ tableVal;
+  }
+  return crc ^ 0xFFFFFFFF;
+};

pw_hdlc/ts/encoder_test.ts

@@ -86,4 +86,15 @@ describe('Encoder', () => {
     );
     expect(encoder.uiFrame(0x3e, data2)).toEqual(withFlags(expectedContent2));
   });
+
+  it('Computes frameCheckSequence correctly', () => {
+    expect(protocol.frameCheckSequence(textEncoder.encode('\x7d\x03A\x7e\x7dBC')))
+      .toEqual(new Uint8Array([195, 124, 135, 9]));
+    expect(protocol.frameCheckSequence(textEncoder.encode('\x7d\x5d\x03\x7d\x5d')))
+      .toEqual(new Uint8Array([183, 144, 10, 115]));
+    expect(protocol.frameCheckSequence(textEncoder.encode('\x7d\x03\x7d')))
+      .toEqual(new Uint8Array([83, 124, 241, 166]));
+    expect(protocol.frameCheckSequence(textEncoder.encode('hello pigweed')))
+      .toEqual(new Uint8Array([34, 22, 236, 2]));
+  });
 });

pw_hdlc/ts/protocol.ts

@@ -13,8 +13,7 @@
 // the License.
 
 /** Low-level HDLC protocol features. */
-import {Buffer} from 'buffer';
-import {crc32} from 'crc';
+import {crc32} from './crc32';
 
 /** Special flag character for delimiting HDLC frames. */
 export const FLAG = 0x7e;

pw_tokenizer/ts/detokenizer.ts

@@ -13,7 +13,6 @@
 // the License.
 
 /**  Decodes and detokenizes strings from binary or Base64 input. */
-import {Buffer} from 'buffer';
 import {Frame} from 'pigweedjs/pw_hdlc';
 import {TokenDatabase} from './token_database';
 import {PrintfDecoder} from './printf_decoder';