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Name	Size	Permission
testing	[ DIR ]	drwxrwxr-x
types	[ DIR ]	drwxrwxr-x
b.ts	562 B	-rw-rw-r--
buffer-reader.ts	1.24 KB	-rw-rw-r--
buffer-writer.ts	2.43 KB	-rw-rw-r--
inbound-parser.test.ts	14.67 KB	-rw-rw-r--
index.ts	459 B	-rw-rw-r--
messages.ts	6.18 KB	-rw-rw-r--
outbound-serializer.test.ts	8.25 KB	-rw-rw-r--
parser.ts	13.11 KB	-rw-rw-r--
serializer.ts	7.02 KB	-rw-rw-r--

Code Editor : buffer-writer.ts

//binary data writer tuned for encoding binary specific to the postgres binary protocol

export class Writer {
  private buffer: Buffer
  private offset: number = 5
  private headerPosition: number = 0
  constructor(private size = 256) {
    this.buffer = Buffer.allocUnsafe(size)
  }

private ensure(size: number): void {
    var remaining = this.buffer.length - this.offset
    if (remaining < size) {
      var oldBuffer = this.buffer
      // exponential growth factor of around ~ 1.5
      // https://stackoverflow.com/questions/2269063/buffer-growth-strategy
      var newSize = oldBuffer.length + (oldBuffer.length >> 1) + size
      this.buffer = Buffer.allocUnsafe(newSize)
      oldBuffer.copy(this.buffer)
    }
  }

public addInt32(num: number): Writer {
    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
  }

public addInt16(num: number): Writer {
    this.ensure(2)
    this.buffer[this.offset++] = (num >>> 8) & 0xff
    this.buffer[this.offset++] = (num >>> 0) & 0xff
    return this
  }

public addCString(string: string): Writer {
    if (!string) {
      this.ensure(1)
    } else {
      var 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
  }

public addString(string: string = ''): Writer {
    var len = Buffer.byteLength(string)
    this.ensure(len)
    this.buffer.write(string, this.offset)
    this.offset += len
    return this
  }

public add(otherBuffer: Buffer): Writer {
    this.ensure(otherBuffer.length)
    otherBuffer.copy(this.buffer, this.offset)
    this.offset += otherBuffer.length
    return this
  }

private join(code?: number): Buffer {
    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)
  }

public flush(code?: number): Buffer {
    var result = this.join(code)
    this.offset = 5
    this.headerPosition = 0
    this.buffer = Buffer.allocUnsafe(this.size)
    return result
  }
}

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The Urban Research Lab (URL) at IIIT-Delhi was established in 2020, during a time when the pandemic brought the complexities of urban life more visible than ever. What started as an initiative by faculty and students has grown into a collaborative space for critically exploring and reimagining the urban questions through research, dialogue, and interdisciplinary engagement.

${this.title}

Code Editor : buffer-writer.ts

Urban Research Lab