.

qwen/nodejs/node_modules/pg-protocol/src/buffer-reader.ts

@@ -0,0 +1,60 @@
+const emptyBuffer = Buffer.allocUnsafe(0)
+
+export class BufferReader {
+  private buffer: Buffer = emptyBuffer
+
+  // TODO(bmc): support non-utf8 encoding?
+  private encoding: string = 'utf-8'
+
+  constructor(private offset: number = 0) {}
+
+  public setBuffer(offset: number, buffer: Buffer): void {
+    this.offset = offset
+    this.buffer = buffer
+  }
+
+  public int16(): number {
+    const result = this.buffer.readInt16BE(this.offset)
+    this.offset += 2
+    return result
+  }
+
+  public byte(): number {
+    const result = this.buffer[this.offset]
+    this.offset++
+    return result
+  }
+
+  public int32(): number {
+    const result = this.buffer.readInt32BE(this.offset)
+    this.offset += 4
+    return result
+  }
+
+  public uint32(): number {
+    const result = this.buffer.readUInt32BE(this.offset)
+    this.offset += 4
+    return result
+  }
+
+  public string(length: number): string {
+    const result = this.buffer.toString(this.encoding, this.offset, this.offset + length)
+    this.offset += length
+    return result
+  }
+
+  public cstring(): string {
+    const start = this.offset
+    let end = start
+    // eslint-disable-next-line no-empty
+    while (this.buffer[end++] !== 0) {}
+    this.offset = end
+    return this.buffer.toString(this.encoding, start, end - 1)
+  }
+
+  public bytes(length: number): Buffer {
+    const result = this.buffer.slice(this.offset, this.offset + length)
+    this.offset += length
+    return result
+  }
+}