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/* ipp-usb - HTTP reverse proxy, backed by IPP-over-USB connection to device
*
* Copyright (C) 2020 and up by Alexander Pevzner (pzz@apevzner.com)
* See LICENSE for license terms and conditions
*
* Paper Size Classifier
*/
package main
// PaperSize represents paper size, in IPP units (1/100 mm)
type PaperSize struct {
Width, Height int // Paper width and height
}
// Standard paper sizes
// US name US inches US mm ISO mm
// "legal-A4" A, Legal 8.5 x 14 215.9 x 355.6 A4: 210 x 297
// "tabloid-A3" B, Tabloid 11 x 17 279.4 x 431.8 A3: 297 x 420
// "isoC-A2" C 17 × 22 431.8 × 558.8 A2: 420 x 594
//
// Please note, Apple in the "Bonjour Printing Specification"
// incorrectly states paper sizes as 9x14, 13x19 and 18x24 inches
var (
PaperLegal = PaperSize{21590, 35560}
PaperA4 = PaperSize{21000, 29700}
PaperTabloid = PaperSize{27940, 43180}
PaperA3 = PaperSize{29700, 42000}
PaperC = PaperSize{43180, 55880}
PaperA2 = PaperSize{42000, 59400}
)
// Less checks that p is less that p2, which means:
// * Either p.Width or p.Height is less that p2.Width or p2.Heigh
// * Neither of p.Width or p.Height is greater that p2.Width or p2.Heigh
func (p PaperSize) Less(p2 PaperSize) bool {
return (p.Width < p2.Width && p.Height <= p2.Height) ||
(p.Height < p2.Height && p.Width <= p2.Width)
}
// Classify paper size according to Apple Bonjour rules
// Returns:
// ">isoC-A2" for paper larger that C or A2
// "isoC-A2" for C or A2 paper
// "tabloid-A3" for Tabloid or A3 paper
// "legal-A4" for Legal or A4 paper
// "<legal-A4" for paper smaller that Legal or A4
func (p PaperSize) Classify() string {
switch {
case PaperC.Less(p) || PaperA2.Less(p):
return ">isoC-A2"
case !p.Less(PaperC) || !p.Less(PaperA2):
return "isoC-A2"
case !p.Less(PaperTabloid) || !p.Less(PaperA3):
return "tabloid-A3"
case !p.Less(PaperLegal) || !p.Less(PaperA4):
return "legal-A4"
default:
return "<legal-A4"
}
}
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