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_node_modules/pg-protocol/src/testing/buffer-list.ts

@@ -0,0 +1,67 @@
+export default class BufferList {
+  constructor(public buffers: Buffer[] = []) {}
+
+  public add(buffer: Buffer, front?: boolean) {
+    this.buffers[front ? 'unshift' : 'push'](buffer)
+    return this
+  }
+
+  public addInt16(val: number, front?: boolean) {
+    return this.add(Buffer.from([val >>> 8, val >>> 0]), front)
+  }
+
+  public getByteLength() {
+    return this.buffers.reduce(function (previous, current) {
+      return previous + current.length
+    }, 0)
+  }
+
+  public addInt32(val: number, first?: boolean) {
+    return this.add(
+      Buffer.from([(val >>> 24) & 0xff, (val >>> 16) & 0xff, (val >>> 8) & 0xff, (val >>> 0) & 0xff]),
+      first
+    )
+  }
+
+  public addCString(val: string, front?: boolean) {
+    const len = Buffer.byteLength(val)
+    const buffer = Buffer.alloc(len + 1)
+    buffer.write(val)
+    buffer[len] = 0
+    return this.add(buffer, front)
+  }
+
+  public addString(val: string, front?: boolean) {
+    const len = Buffer.byteLength(val)
+    const buffer = Buffer.alloc(len)
+    buffer.write(val)
+    return this.add(buffer, front)
+  }
+
+  public addChar(char: string, first?: boolean) {
+    return this.add(Buffer.from(char, 'utf8'), first)
+  }
+
+  public addByte(byte: number) {
+    return this.add(Buffer.from([byte]))
+  }
+
+  public join(appendLength?: boolean, char?: string): Buffer {
+    let length = this.getByteLength()
+    if (appendLength) {
+      this.addInt32(length + 4, true)
+      return this.join(false, char)
+    }
+    if (char) {
+      this.addChar(char, true)
+      length++
+    }
+    const result = Buffer.alloc(length)
+    let index = 0
+    this.buffers.forEach(function (buffer) {
+      buffer.copy(result, index, 0)
+      index += buffer.length
+    })
+    return result
+  }
+}