1 files changed, 64 insertions, 0 deletions
diff --git a/comm/third_party/asn1js/src/BitString.ts b/comm/third_party/asn1js/src/BitString.ts
new file mode 100644
index 0000000000..2c8ada83cc
--- /dev/null
+++ b/comm/third_party/asn1js/src/BitString.ts
@@ -0,0 +1,64 @@
+import { BaseBlock, BaseBlockJson, BaseBlockParams } from "./BaseBlock";
+import { Constructed } from "./Constructed";
+import { BIT_STRING_NAME } from "./internals/constants";
+import { LocalBitStringValueBlockParams, LocalBitStringValueBlock, LocalBitStringValueBlockJson } from "./internals/LocalBitStringValueBlock";
+import { typeStore } from "./TypeStore";
+
+export interface BitStringParams extends BaseBlockParams, LocalBitStringValueBlockParams { }
+export type BitStringJson = BaseBlockJson<LocalBitStringValueBlockJson>;
+
+export class BitString extends BaseBlock<LocalBitStringValueBlock, LocalBitStringValueBlockJson> {
+
+  static {
+    typeStore.BitString = this;
+  }
+
+  public static override NAME = BIT_STRING_NAME;
+
+  constructor({
+    idBlock = {},
+    lenBlock = {},
+    ...parameters
+  }: BitStringParams = {}) {
+    parameters.isConstructed ??= !!parameters.value?.length;
+    super({
+      idBlock: {
+        isConstructed: parameters.isConstructed,
+        ...idBlock,
+      },
+      lenBlock: {
+        ...lenBlock,
+        isIndefiniteForm: !!parameters.isIndefiniteForm,
+      },
+      ...parameters,
+    }, LocalBitStringValueBlock);
+
+    this.idBlock.tagClass = 1; // UNIVERSAL
+    this.idBlock.tagNumber = 3; // BitString
+  }
+
+  public override fromBER(inputBuffer: ArrayBuffer | Uint8Array, inputOffset: number, inputLength: number): number {
+    this.valueBlock.isConstructed = this.idBlock.isConstructed;
+    this.valueBlock.isIndefiniteForm = this.lenBlock.isIndefiniteForm;
+
+    return super.fromBER(inputBuffer, inputOffset, inputLength);
+  }
+
+  protected override onAsciiEncoding(): string {
+    if (this.valueBlock.isConstructed || (this.valueBlock.value && this.valueBlock.value.length)) {
+      return Constructed.prototype.onAsciiEncoding.call(this);
+    } else {
+      // convert bytes to bits
+      const bits = [];
+      const valueHex = this.valueBlock.valueHexView;
+      for (const byte of valueHex) {
+        bits.push(byte.toString(2).padStart(8, "0"));
+      }
+
+      const bitsStr = bits.join("");
+
+      return `${(this.constructor as typeof BitString).NAME} : ${bitsStr.substring(0, bitsStr.length - this.valueBlock.unusedBits)}`;
+    }
+  }
+
+}