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Cloudflare Workers

QR Code Compression Worker

github.com/king8fisher/qrcodeworker

Cloudflare worker, that converts a requested text into QR Code data array, with API for packing 3x3 modules as 9-bit numbers for low-end devices that expect a packing to reduce their CPU usage:

1 +-----+-----+-----+-----+        +-----+-----+-----+-----+
2 |0 0 0|1 1 0|1 0 1|0 0 1|        |     |     |     |     |
3 |1 1 0|1 0 1|1 0 1|0 1 1|        |  24 | 235 | 365 | 308 |
4 |0 0 0|1 1 0|1 0 1|0 0 1|        |     |     |     |     |
5 +-----+-----+-----+-----+   ->   +-----+-----+-----+-----+
6 |0 0 0|1 0 0|1 1 1|0 0 1|        |     |     |     |     |
7 |0 0 0|1 0 1|1 1 1|0 0 1|        |  0  | 233 | 511 | 292 |
8 |0 0 0|1 1 0|1 1 1|0 0 1|        |     |     |     |     |
9 +-----+-----+-----+-----+        +-----+-----+-----+-----+

Bits being layed out this way:

1 +------------+
2 |1   2   4   |   1<<0  1<<1   1<<2
3 |8   16  32  |   1<<3  1<<4   1<<5
4 |64  128 256 |   1<<6  1<<7   1<<8
5 +------------+