qrcode

QR code generation (with optional logo overlay and styled modules), decoding, and anti-counterfeiting signing/encryption.

Features

• Generation: Generate, GeneratePNG, Save with configurable error-correction level
• Logo overlay: composite a logo onto the QR center with a safe zone
• Fancy/styled: custom module shapes (circle, rounded, liquid, stripes, diamond), gradients, transparent background, halftone QR
• Decoding: Decode, DecodeFile, DecodeBytes via ZXing (gozxing)
• Anti-counterfeiting: Sign/Verify (HMAC), Encrypt/Decrypt (AES-GCM), Secure/Unseal (encrypt + sign)

Key types

• ErrorCorrectionLevel — ECLLow, ECLMedium, ECLQuartile, ECLHigh
• ModuleShape — styled module shapes for fancy QR codes

Quick start

import "github.com/LingByte/ling-base/common/qrcode"

pngBytes, _ := qrcode.GeneratePNG("https://example.com", qrcode.ECLMedium, 256)
_ = qrcode.Save("https://example.com", "qr.png", qrcode.ECLHigh, 400)

text, _ := qrcode.DecodeFile("qr.png")

// Anti-counterfeit: sign then verify.
token, _ := qrcode.Sign("product-id:12345", secretKey)
payload, err := qrcode.Verify(token, secretKey, 0)