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qwen/nodejs/node_modules/pg-protocol/dist/buffer-writer.js

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+"use strict";
+//binary data writer tuned for encoding binary specific to the postgres binary protocol
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Writer = void 0;
+class Writer {
+    constructor(size = 256) {
+        this.size = size;
+        this.offset = 5;
+        this.headerPosition = 0;
+        this.buffer = Buffer.allocUnsafe(size);
+    }
+    ensure(size) {
+        const remaining = this.buffer.length - this.offset;
+        if (remaining < size) {
+            const oldBuffer = this.buffer;
+            // exponential growth factor of around ~ 1.5
+            // https://stackoverflow.com/questions/2269063/buffer-growth-strategy
+            const newSize = oldBuffer.length + (oldBuffer.length >> 1) + size;
+            this.buffer = Buffer.allocUnsafe(newSize);
+            oldBuffer.copy(this.buffer);
+        }
+    }
+    addInt32(num) {
+        this.ensure(4);
+        this.buffer[this.offset++] = (num >>> 24) & 0xff;
+        this.buffer[this.offset++] = (num >>> 16) & 0xff;
+        this.buffer[this.offset++] = (num >>> 8) & 0xff;
+        this.buffer[this.offset++] = (num >>> 0) & 0xff;
+        return this;
+    }
+    addInt16(num) {
+        this.ensure(2);
+        this.buffer[this.offset++] = (num >>> 8) & 0xff;
+        this.buffer[this.offset++] = (num >>> 0) & 0xff;
+        return this;
+    }
+    addCString(string) {
+        if (!string) {
+            this.ensure(1);
+        }
+        else {
+            const len = Buffer.byteLength(string);
+            this.ensure(len + 1); // +1 for null terminator
+            this.buffer.write(string, this.offset, 'utf-8');
+            this.offset += len;
+        }
+        this.buffer[this.offset++] = 0; // null terminator
+        return this;
+    }
+    addString(string = '') {
+        const len = Buffer.byteLength(string);
+        this.ensure(len);
+        this.buffer.write(string, this.offset);
+        this.offset += len;
+        return this;
+    }
+    add(otherBuffer) {
+        this.ensure(otherBuffer.length);
+        otherBuffer.copy(this.buffer, this.offset);
+        this.offset += otherBuffer.length;
+        return this;
+    }
+    join(code) {
+        if (code) {
+            this.buffer[this.headerPosition] = code;
+            //length is everything in this packet minus the code
+            const length = this.offset - (this.headerPosition + 1);
+            this.buffer.writeInt32BE(length, this.headerPosition + 1);
+        }
+        return this.buffer.slice(code ? 0 : 5, this.offset);
+    }
+    flush(code) {
+        const result = this.join(code);
+        this.offset = 5;
+        this.headerPosition = 0;
+        this.buffer = Buffer.allocUnsafe(this.size);
+        return result;
+    }
+}
+exports.Writer = Writer;
+//# sourceMappingURL=buffer-writer.js.map