Go QR encoder package.

go get [-u] github.com/unixdj/qr

Based on rsc.io/qr by Russ Cox. Drop in replacement for package qr. The API of package coding is incompatible.

Improvements to qr.Encode:

• Automatic mask selection
• Splitting text into segments to minimise encoded length
• Kanji mode segments
• Faster encoding

Added features in package qr:

• Splitting text into multiple QR codes (Structured Append)
• Micro QR codes
• Printing codes as UTF-8 text
• Prepending an ECI mode segment to set character encoding
• Character encodings:
  • UTF-8 (default)
  • UTF-8 with byte mode segments encoded as ISO 8859-1
  • Shift JIS, Shift JISx0213 (Shift JIS-2004)
  • ASCII-compatible eight bit encodings
• Image encoding:
  • Faster and more efficient PNG encoder
  • Encoding PNG into io.Writer, additionally to byte slice
  • PBM encoder (side effect of PNG encoding implementation)
  • Border (quiet zone) size configuration
  • Reverse colours (also for text printing)
  • Custom colour palette (PNG/EncodePNG and Image only)

Encoding customisation (packages coding and split):

• Adding segment encoders
• Adding input character encodings