Initial working version

2022-12-22 20:22:22 +11:00
parent ce9675a1cc
commit ced7fa5092
902 changed files with 150252 additions and 0 deletions
@@ -0,0 +1,54 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.BitReader = void 0;
+const Token = require("token-types");
+class BitReader {
+    constructor(tokenizer) {
+        this.tokenizer = tokenizer;
+        this.pos = 0;
+        this.dword = undefined;
+    }
+    /**
+     *
+     * @param bits 1..30 bits
+     */
+    async read(bits) {
+        while (this.dword === undefined) {
+            this.dword = await this.tokenizer.readToken(Token.UINT32_LE);
+        }
+        let out = this.dword;
+        this.pos += bits;
+        if (this.pos < 32) {
+            out >>>= (32 - this.pos);
+            return out & ((1 << bits) - 1);
+        }
+        else {
+            this.pos -= 32;
+            if (this.pos === 0) {
+                this.dword = undefined;
+                return out & ((1 << bits) - 1);
+            }
+            else {
+                this.dword = await this.tokenizer.readToken(Token.UINT32_LE);
+                if (this.pos) {
+                    out <<= this.pos;
+                    out |= this.dword >>> (32 - this.pos);
+                }
+                return out & ((1 << bits) - 1);
+            }
+        }
+    }
+    async ignore(bits) {
+        if (this.pos > 0) {
+            const remaining = 32 - this.pos;
+            this.dword = undefined;
+            bits -= remaining;
+            this.pos = 0;
+        }
+        const remainder = bits % 32;
+        const numOfWords = (bits - remainder) / 32;
+        await this.tokenizer.ignore(numOfWords * 4);
+        return this.read(remainder);
+    }
+}
+exports.BitReader = BitReader;