Function isValidPng

apps/sim/lib/uploads/utils/validation.ts:334–336

(buffer: Buffer)

 * Validate that a buffer contains valid PNG data by checking magic bytes
 */
export function isValidPng(buffer: Buffer): boolean {
  return buffer.length >= 8 && buffer.subarray(0, 8).equals(PNG_MAGIC_BYTES)
}

/**
 * Detect a renderable raster image from its leading bytes, returning the canonical MIME type or