/
main.go
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/
main.go
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// seehuhn.de/go/pdf - a library for reading and writing PDF files
// Copyright (C) 2022 Jochen Voss <voss@seehuhn.de>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package main
import (
"fmt"
"log"
"os"
"sort"
"golang.org/x/exp/maps"
"seehuhn.de/go/sfnt/cmap"
"seehuhn.de/go/sfnt/header"
)
func tryFont(fname string) error {
fmt.Println()
fmt.Println("#", fname)
fd, err := os.Open(fname)
if err != nil {
return err
}
defer fd.Close()
header, err := header.Read(fd)
if err != nil {
return err
}
cmapData, err := header.ReadTableBytes(fd, "cmap")
if err != nil {
return err
}
fmt.Printf("cmap table: %d bytes\n", len(cmapData))
subtables, err := cmap.Decode(cmapData)
if err != nil {
return err
}
fmt.Printf("%d subtables\n", len(subtables))
keys := maps.Keys(subtables)
sort.Slice(keys, func(i, j int) bool {
if keys[i].PlatformID != keys[j].PlatformID {
return keys[i].PlatformID < keys[j].PlatformID
}
if keys[i].EncodingID != keys[j].EncodingID {
return keys[i].EncodingID < keys[j].EncodingID
}
return keys[i].Language < keys[j].Language
})
for i, key := range keys {
subtableData := subtables[key]
format := uint16(subtableData[0])<<8 | uint16(subtableData[1])
fmt.Println()
fmt.Printf("## subtable %d: PlatformID=%d, EncodingID=%d, language=%d\n",
i+1, key.PlatformID, key.EncodingID, key.Language)
fmt.Printf("format: %d\n", format)
fmt.Printf("length: %d bytes\n", len(subtables[key]))
subtable, err := subtables.Get(key)
if err != nil {
fmt.Println("cannot parse subtable:", err)
continue
}
_ = subtable
}
return nil
}
func main() {
fonts := os.Args[1:]
fmt.Printf("analyzing %d fonts\n", len(fonts))
for _, fname := range fonts {
err := tryFont(fname)
if err != nil {
log.Fatal(err)
}
}
}