Class ImageBytesDetector

Namespace
Kuestenlogik.Bowire.Semantics.Detectors
Assembly
Kuestenlogik.Bowire.dll

Detects string-typed leaves whose base64 prefix decodes to bytes matching a known image magic-number: PNG, JPEG, GIF87a / 89a, WebP, AVIF. Only the first 12 bytes are decoded so the cost is bounded regardless of the payload size.

public sealed class ImageBytesDetector : IBowireFieldDetector
Inheritance
ImageBytesDetector
Implements
Inherited Members

Remarks

Magic table:

  • PNG — 89 50 4E 47 0D 0A 1A 0A.
  • JPEG — FF D8 FF.
  • GIF — 47 49 46 38 [37|39] 61 (GIF87a or GIF89a).
  • WebP — RIFF header at byte 0 + WEBP at byte 8.
  • AVIF — ftyp+avif brand at byte 4.

The 12-byte window is the minimum needed to discriminate WebP and AVIF (both have content past byte 8 that disambiguates them from other RIFF/ftyp containers).

Constructors

ImageBytesDetector() 

public ImageBytesDetector()

Properties

Id

Stable id used by logging + the future "registered detectors" surface. Conventionally a dotted namespace (kuestenlogik.wgs84-coordinate); not required to be a URI.

public string Id { get; }

Property Value

string

Methods

Detect(in DetectionContext) 

public IEnumerable<DetectionResult> Detect(in DetectionContext ctx)

Parameters

ctx DetectionContext

Returns

IEnumerable<DetectionResult>