mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-30 01:27:26 +08:00
104 lines
2.8 KiB
Go
104 lines
2.8 KiB
Go
// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package ofdgo
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import (
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"bytes"
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"context"
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"io"
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"maps"
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"slices"
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)
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// compactVersionFonts 清理仅由版本清单保留的无引用字体，同步清单且不修改编辑器快照
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// 入参: ctx 取消上下文, parts 输出修改, removed 待删除条目
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// 返回: error 读取、结构或取消错误
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func (e *Editor) compactVersionFonts(ctx context.Context, parts map[string][]byte, removed map[string]bool) error {
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reader := e.source.reader
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versioned := false
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for _, body := range reader.OFD.DocBody {
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versioned = versioned || body.versioned
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}
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if !versioned {
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return nil
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}
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protected, err := reader.hasOutputSignatures()
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if err != nil || protected {
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return err
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}
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view := &Reader{Zip: reader.Zip, files: maps.Clone(reader.files)}
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if view.files == nil {
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view.files = make(map[string][]byte)
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}
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maps.Copy(view.files, parts)
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if err := view.initRoot(); err != nil {
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return err
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}
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candidates, seen := make(map[string]bool), make(map[string]bool)
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for index := range view.DocumentCount() {
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view.documentIndex = index
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versions, err := view.DocumentVersions()
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if err != nil {
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return err
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}
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for _, version := range versions {
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for _, file := range version.Files {
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if err := ctx.Err(); err != nil {
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return err
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}
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name := file.Location
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if seen[name] || removed[name] {
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continue
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}
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seen[name] = true
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input, err := view.openFile(name)
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if err != nil {
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return err
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}
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var header [4]byte
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n, err := io.ReadFull(input, header[:])
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input.Close()
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if err != nil && err != io.EOF && err != io.ErrUnexpectedEOF {
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return err
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}
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if n == len(header) {
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switch string(header[:]) {
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case "\x00\x01\x00\x00", "OTTO", "ttcf":
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candidates[name] = true
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}
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}
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}
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}
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}
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if len(candidates) == 0 {
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return nil
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}
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if err := pruneExternalFontFiles(ctx, view, slices.Collect(maps.Keys(candidates))...); err != nil {
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return err
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}
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for name, data := range view.files {
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if original, ok := reader.files[name]; !ok || !bytes.Equal(original, data) {
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parts[name] = data
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}
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}
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for name := range candidates {
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if !view.fileNames[name] {
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removed[name] = true
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delete(parts, name)
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}
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}
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return nil
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}
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