mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-29 14:16:55 +08:00
676 lines
20 KiB
Go
676 lines
20 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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"crypto/sha256"
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"encoding/xml"
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"fmt"
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"image"
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"io"
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"maps"
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"path"
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"slices"
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"strings"
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)
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// outputImageKey 区分相同图像的压缩配置和像素需求，不跨写出保留状态
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type outputImageKey struct {
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hash [32]byte
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options CompressionOptions
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size image.Point
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}
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// editorProfileReference 记录颜色配置文件所在的资源索引及颜色空间标识
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type editorProfileReference struct {
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index string
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id string
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}
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// compressResourceParts 优化输出图片并合并相同资源文件，保留资源标识及各自属性
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// 入参: parts 输出改动, reader 原包，可为空, removed 已移除条目
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// 返回: error 读取或取消错误
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func (e *Editor) compressResourceParts(parts map[string][]byte, reader *Reader, removed map[string]bool) error {
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if reader == nil && e.output != nil && e.output.options.Mode != CompressionUnchanged && !e.output.protected {
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unused, err := e.compactResourceReferences(parts, nil, editorProgress(e.OnWriteProgress), nil, nil)
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if err != nil {
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return err
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}
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maps.Copy(removed, unused)
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}
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return e.compressResourceReferences(parts, reader, removed, nil)
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}
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// compressResourceReferences 优化资源，复用自产页面引用并流式读取暂存页面
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// 版本文件隔离当前入口，其他文档仅优化未受版本保护的资源；结果仅在本次写出内复用
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// 入参: parts 输出改动, reader 原包, removed 已移除条目, generated 本次自产页面及引用
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// 返回: error 读取或取消错误
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func (e *Editor) compressResourceReferences(parts map[string][]byte, reader *Reader, removed map[string]bool, generated map[string]editorGeneratedReferences) error {
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if e.output == nil || e.output.options.Mode == CompressionUnchanged || e.output.protected {
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return nil
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}
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generated = e.generatedVectorReferences(parts, generated)
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selected, scope, err := reader.versionResourceFiles(e.output.ctx, parts, generated)
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if err != nil {
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return err
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}
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names := make(map[string]bool)
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if reader != nil {
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for name := range reader.fileIndex {
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names[name] = true
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}
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for name := range reader.files {
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names[name] = true
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}
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}
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for name := range parts {
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names[name] = true
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}
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read := func(name string) ([]byte, error) {
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if err := e.output.ctx.Err(); err != nil {
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return nil, err
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}
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if data, ok := parts[name]; ok {
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return data, nil
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}
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return reader.readFileViewContext(e.output.ctx, name)
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}
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actual := make(map[string]string)
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for _, name := range slices.Sorted(maps.Keys(names)) {
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if err := e.output.ctx.Err(); err != nil {
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return err
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}
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key := cleanPackagePath(name)
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if removed[key] || strings.HasSuffix(name, "/") {
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delete(names, name)
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continue
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}
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if prior, ok := actual[key]; ok && prior != name {
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return nil
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}
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actual[key] = name
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if scope != nil && !scope[key] {
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delete(names, name)
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continue
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}
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}
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collect := reader != nil && reader.DocumentCount() > 1 && e.backends.FontResources != nil
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refs, resources, references, safe, err := scanEditorResources(e.output.ctx, reader, parts, generated, names, nil, collect)
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if err != nil || !safe {
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return err
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}
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if selected != nil && reader.DocumentCount() > 1 {
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preserved, err := reader.versionPreservedFiles(e.output.ctx)
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if err != nil {
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return err
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}
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for name := range preserved {
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if !selected[name] {
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refs.files[name], refs.versions[name] = true, true
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}
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}
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}
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type resourceFile struct{ key, role string }
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type resourceScope struct {
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role string
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selected bool
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}
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type resourceSize struct {
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role string
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size uint64
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}
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files := make(map[resourceFile]bool)
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for _, name := range resources {
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data, err := read(name)
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if err != nil {
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return err
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}
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root, err := parseEditorXMLContext(e.output.ctx, data)
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if err != nil {
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return err
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}
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preserved := refs.versions[cleanPackagePath(name)]
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for _, group := range root.children {
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for _, node := range group.children {
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if err := e.output.ctx.Err(); err != nil {
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return err
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}
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field := ""
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if group.name.Local == "Fonts" && node.name.Local == "Font" {
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field = "FontFile"
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}
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if group.name.Local == "MultiMedias" && node.name.Local == "MultiMedia" {
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field = "MediaFile"
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}
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if field == "" {
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continue
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}
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file := node.child(field)
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if file == nil {
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continue
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}
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var value string
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if err := xml.Unmarshal(data[file.start:file.end], &value); err != nil {
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return err
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}
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key := editorResourceLocation(name, root.attr("BaseLoc"), value)
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if selected != nil && !selected[cleanPackagePath(name)] && selected[key] {
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continue
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}
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if preserved || field == "MediaFile" && node.attr("Type") != "Image" {
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refs.files[key] = true
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continue
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}
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if key != cleanPackagePath(resolveResourcePath(name, root.attr("BaseLoc"), value)) {
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return nil
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}
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if actual[key] != "" && !refs.files[key] {
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files[resourceFile{key, field}] = true
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}
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}
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}
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}
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var fontUsage map[string]*editorFontUsage
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if references != nil {
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fontUsage, err = reader.compressionFontUsage(e.output.ctx, refs.documents, resources, references, read)
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if err != nil {
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return err
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}
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}
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aliases := make(map[string]string)
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locations := maps.Clone(actual)
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reserved := make(map[string]bool, len(actual))
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for key := range actual {
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reserved[key] = true
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}
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formats := make(map[string]string)
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seen := make(map[resourceScope]map[[32]byte]string)
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imageResults := make(map[outputImageKey][]byte)
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imageDigests := make(map[outputImageKey][32]byte)
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imageSources := make(map[string]outputImageSource)
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ordered := slices.Sorted(maps.Keys(actual))
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sizes := make(map[string]uint64, len(files))
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largeCounts := make(map[resourceSize]int)
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var imageKeys []string
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for _, key := range ordered {
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if err := e.output.ctx.Err(); err != nil {
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return err
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}
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font, media := files[resourceFile{key, "FontFile"}], files[resourceFile{key, "MediaFile"}]
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if refs.files[key] || font == media {
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continue
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}
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size, err := outputResourceSize(reader, parts, actual[key])
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if err != nil {
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return err
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}
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sizes[key] = size
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if size > outputOptimizationBufferLimit {
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role := "MediaFile"
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if font {
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role = "FontFile"
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}
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largeCounts[resourceSize{role, size}]++
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} else if media {
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imageKeys = append(imageKeys, key)
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}
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}
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load := func(key string) ([]byte, error) {
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if sizes[key] > outputOptimizationBufferLimit {
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return nil, nil
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}
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return read(actual[key])
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}
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if err := e.prepareOutputImages(imageKeys, load, imageResults, imageSources); err != nil {
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return err
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}
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var fontCache editorSourceFontCache
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var hashBuffer []byte
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for _, key := range ordered {
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if refs.files[key] || files[resourceFile{key, "FontFile"}] && files[resourceFile{key, "MediaFile"}] {
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continue
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}
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for _, role := range []string{"FontFile", "MediaFile"} {
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if !files[resourceFile{key, role}] {
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continue
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}
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if err := editorProgress(e.OnWriteProgress).withContext(e.output.ctx).report("compress", e.output.completed, 0); err != nil {
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return err
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}
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if size := sizes[key]; size > outputOptimizationBufferLimit && largeCounts[resourceSize{role, size}] < 2 {
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continue
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}
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source, prefetched := imageSources[key]
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usage := fontUsage[key]
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subset := role == "FontFile" && usage != nil && !usage.unsafe && e.backends.FontResources != nil
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var data []byte
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optimizable := prefetched
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if !prefetched {
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var err error
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if role == "MediaFile" || subset {
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data, err = load(key)
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if err != nil {
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return err
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}
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}
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optimizable = data != nil
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if optimizable {
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source.key.hash = sha256.Sum256(data)
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} else {
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if hashBuffer == nil {
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hashBuffer = make([]byte, 32*1024)
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}
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source.key.hash, err = outputResourceDigest(e.output.ctx, reader, parts, actual[key], hashBuffer)
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if err != nil {
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return err
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}
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}
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}
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if optimizable && subset {
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candidate, err := fontCache.subset(e.output.ctx, e.backends.FontResources, data, usage)
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if err != nil {
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return fmt.Errorf("subset font %s: %w", key, err)
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}
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if err := e.output.ctx.Err(); err != nil {
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return err
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}
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if len(candidate) != 0 && len(candidate) < len(data) {
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data = candidate
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parts[actual[key]] = data
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source.key.hash = sha256.Sum256(data)
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}
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}
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if role == "MediaFile" && optimizable {
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options, demand := e.outputImageOptions(key)
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cacheKey := outputImageKey{hash: source.key.hash, options: options, size: demand}
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candidate, cached := imageResults[cacheKey]
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var err error
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if !cached {
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candidate, err = optimizeOutputImage(e.output.ctx, outputImageJob{data: data, key: outputImageKey{options: options, size: demand}})
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if err := e.output.ctx.Err(); err != nil {
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return err
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}
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imageResults[cacheKey] = nil
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if err == nil && len(candidate) < len(data) {
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imageResults[cacheKey] = candidate
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} else {
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candidate = nil
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}
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}
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if candidate != nil {
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data = candidate
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parts[actual[key]] = data
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digest, ok := imageDigests[cacheKey]
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if !ok {
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digest = sha256.Sum256(data)
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imageDigests[cacheKey] = digest
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}
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source.key.hash = digest
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}
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if data != nil {
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source.format = outputImageFormat(data)
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}
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if source.format != "" {
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formats[key] = source.format
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suffix := ".png"
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if source.format == "JPEG" {
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suffix = ".jpg"
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}
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ext := path.Ext(actual[key])
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if !strings.EqualFold(ext, suffix) && !(source.format == "JPEG" && strings.EqualFold(ext, ".jpeg")) {
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if data == nil {
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data, err = read(actual[key])
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if err != nil {
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return err
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}
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}
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stem := strings.TrimSuffix(actual[key], ext)
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name := stem + suffix
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for n := 1; reserved[name]; n++ {
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name = fmt.Sprintf("%s-%d%s", stem, n, suffix)
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}
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reserved[name] = true
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locations[key] = name
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parts[name] = data
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delete(parts, actual[key])
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removed[key] = true
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}
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}
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}
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scope := resourceScope{role, selected[key]}
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if seen[scope] == nil {
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seen[scope] = make(map[[32]byte]string)
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}
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hash := source.key.hash
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if first, ok := seen[scope][hash]; ok {
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aliases[key] = first
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removed[key] = true
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if locations[key] != actual[key] {
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delete(parts, locations[key])
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}
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} else {
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seen[scope][hash] = key
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}
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}
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}
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if len(aliases) == 0 && len(formats) == 0 {
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return e.output.ctx.Err()
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}
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for _, name := range resources {
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if refs.versions[cleanPackagePath(name)] {
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continue
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}
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data, err := read(name)
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if err != nil {
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return err
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}
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root, err := parseEditorXMLContext(e.output.ctx, data)
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if err != nil {
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return err
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}
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var patches []editorXMLPatch
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for _, group := range root.children {
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for _, node := range group.children {
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if err := e.output.ctx.Err(); err != nil {
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return err
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}
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for _, field := range []string{"FontFile", "MediaFile"} {
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file := node.child(field)
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if file == nil {
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continue
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}
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var value string
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if err := xml.Unmarshal(data[file.start:file.end], &value); err != nil {
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return err
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}
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key := editorResourceLocation(name, root.attr("BaseLoc"), value)
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if selected != nil && !selected[cleanPackagePath(name)] && selected[key] {
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continue
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}
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location := locations[key]
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if first, ok := aliases[key]; ok {
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location = locations[first]
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}
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if location != "" && location != actual[key] {
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var escaped bytes.Buffer
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xml.EscapeText(&escaped, []byte("/"+location))
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patches = append(patches, editorXMLContent(data, file, escaped.Bytes()))
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}
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if field == "MediaFile" && formats[key] != "" && node.attr("Format") != formats[key] {
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patch, err := editorXMLAttributePatch(data, node, "Format", formats[key])
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if err != nil {
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return err
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}
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patches = append(patches, patch)
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}
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}
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}
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}
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if len(patches) > 0 {
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parts[name] = editorPatchXML(data, patches)
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}
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}
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return e.output.ctx.Err()
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}
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// outputResourceSize 获取资源的实际输出大小，优先使用本次改动及已加载数据
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// 入参: reader 原包，可为空, parts 输出改动, name 资源路径
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// 返回: uint64 未压缩字节数, error 文件不存在
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func outputResourceSize(reader *Reader, parts map[string][]byte, name string) (uint64, error) {
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if data, ok := parts[name]; ok {
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return uint64(len(data)), nil
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}
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if reader != nil {
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if data, ok := reader.files[cleanPackagePath(name)]; ok {
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return uint64(len(data)), nil
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}
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if file, ok := reader.packageFile(name); ok {
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return file.UncompressedSize64, nil
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}
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}
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return 0, fmt.Errorf("file not found: %s", name)
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}
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// outputResourceDigest 流式计算资源摘要，不将原包中的大文件加载到内存
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// 入参: ctx 取消上下文, reader 原包，可为空, parts 输出改动, name 资源路径, buffer 复用缓冲
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// 返回: [32]byte 内容摘要, error 读取或取消错误
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func outputResourceDigest(ctx context.Context, reader *Reader, parts map[string][]byte, name string, buffer []byte) ([32]byte, error) {
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if err := ctx.Err(); err != nil {
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return [32]byte{}, err
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}
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var input io.ReadCloser
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if data, ok := parts[name]; ok {
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input = io.NopCloser(bytes.NewReader(data))
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} else {
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if reader == nil {
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return [32]byte{}, fmt.Errorf("file not found: %s", name)
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}
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var err error
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input, err = reader.openFile(name)
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if err != nil {
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return [32]byte{}, err
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}
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}
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hash := sha256.New()
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_, err := io.CopyBuffer(hash, imageInput{ReadCloser: input, ctx: ctx}, buffer)
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closeErr := input.Close()
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if err != nil {
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return [32]byte{}, err
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}
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if closeErr != nil {
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return [32]byte{}, closeErr
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}
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return [32]byte(hash.Sum(nil)), ctx.Err()
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}
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// compressionFontUsage 按文档合并共享字体用字，版本编辑仅统计选中入口
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// 入参: ctx 取消上下文, documents 文档入口, resources 资源索引, references 各文件引用, read 输出文件读取方法
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// 返回: map[string]*editorFontUsage 各字体文件的用字，无法确定作用域时为空, error 读取或取消错误
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func (r *Reader) compressionFontUsage(ctx context.Context, documents map[string]bool, resources []string, references map[string]*editorResourceRefs, read func(string) ([]byte, error)) (map[string]*editorFontUsage, error) {
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selected := ""
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if r.OFD.DocBody[r.documentIndex].versioned {
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var err error
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selected, err = r.DocumentRootContext(ctx)
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if err != nil {
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return nil, err
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}
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}
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scoped, err := resourceReferenceScopes(ctx, documents, resources, references, selected)
|
|
if err != nil || scoped == nil {
|
|
return nil, err
|
|
}
|
|
return resourceFontUsage(ctx, resources, scoped, read)
|
|
}
|
|
|
|
// resourceFontUsage 按已确认的文档作用域合并各字体文件的字符和字形引用
|
|
// 入参: ctx 取消上下文, resources 资源索引, scoped 各索引的用字范围, read 输出文件读取方法
|
|
// 返回: map[string]*editorFontUsage 各字体文件的用字, error 读取或取消错误
|
|
func resourceFontUsage(ctx context.Context, resources []string, scoped map[string]*editorResourceRefs, read func(string) ([]byte, error)) (map[string]*editorFontUsage, error) {
|
|
result := make(map[string]*editorFontUsage)
|
|
protected := make(map[string]bool)
|
|
for _, name := range resources {
|
|
if err := ctx.Err(); err != nil {
|
|
return nil, err
|
|
}
|
|
refs := scoped[name]
|
|
if refs == nil {
|
|
continue
|
|
}
|
|
data, err := read(name)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
root, err := parseEditorXMLContext(ctx, data)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
for font := range editorResourceNodes(root, "Fonts", "Font") {
|
|
if err := ctx.Err(); err != nil {
|
|
return nil, err
|
|
}
|
|
file := font.child("FontFile")
|
|
if file == nil {
|
|
continue
|
|
}
|
|
var value string
|
|
if err := xml.Unmarshal(data[file.start:file.end], &value); err != nil {
|
|
return nil, err
|
|
}
|
|
location := editorResourceLocation(name, root.attr("BaseLoc"), value)
|
|
alternate := cleanPackagePath(resolveResourcePath(name, root.attr("BaseLoc"), value))
|
|
id, charset := editorResourceID(font.attr("ID")), font.attr("Charset")
|
|
unsafe := id == "" || charset != "" && !strings.EqualFold(charset, "unicode") || location != alternate
|
|
for i, path := range [2]string{location, alternate} {
|
|
if i == 1 && path == location {
|
|
continue
|
|
}
|
|
if result[path] == nil {
|
|
result[path] = newEditorFontUsage()
|
|
}
|
|
result[path].merge(refs.fonts[id], unsafe)
|
|
}
|
|
}
|
|
for media := range editorResourceNodes(root, "MultiMedias", "MultiMedia") {
|
|
file := media.child("MediaFile")
|
|
if file == nil {
|
|
continue
|
|
}
|
|
var value string
|
|
if err := xml.Unmarshal(data[file.start:file.end], &value); err != nil {
|
|
return nil, err
|
|
}
|
|
for _, location := range []string{editorResourceLocation(name, root.attr("BaseLoc"), value), cleanPackagePath(resolveResourcePath(name, root.attr("BaseLoc"), value))} {
|
|
protected[location] = true
|
|
}
|
|
}
|
|
}
|
|
for location := range protected {
|
|
if usage := result[location]; usage != nil {
|
|
usage.unsafe = true
|
|
}
|
|
}
|
|
return result, ctx.Err()
|
|
}
|
|
|
|
// compactResourceProfiles 合并相同颜色配置文件，保留颜色空间声明和独立文件引用
|
|
// 入参: ctx 取消上下文, reader 原包，可为空, parts 输出改动, profiles 配置文件引用, protected 不可替换的文件, removed 待移除文件
|
|
// 返回: error 读取、改写或取消错误
|
|
func compactResourceProfiles(ctx context.Context, reader *Reader, parts map[string][]byte, profiles map[string][]editorProfileReference, protected, removed map[string]bool) error {
|
|
if len(profiles) < 2 {
|
|
return ctx.Err()
|
|
}
|
|
seen := make(map[[32]byte]string)
|
|
aliases := make(map[string]string)
|
|
indexes := make(map[string]map[string]string)
|
|
ordered := slices.Sorted(maps.Keys(profiles))
|
|
sizes := make(map[string]uint64, len(profiles))
|
|
counts := make(map[uint64]int)
|
|
for _, name := range ordered {
|
|
if err := ctx.Err(); err != nil {
|
|
return err
|
|
}
|
|
if protected[name] {
|
|
continue
|
|
}
|
|
size, err := outputResourceSize(reader, parts, name)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
sizes[name] = size
|
|
counts[size]++
|
|
}
|
|
var buffer []byte
|
|
for _, name := range ordered {
|
|
if err := ctx.Err(); err != nil {
|
|
return err
|
|
}
|
|
if protected[name] || counts[sizes[name]] < 2 {
|
|
continue
|
|
}
|
|
if buffer == nil {
|
|
buffer = make([]byte, 32*1024)
|
|
}
|
|
key, err := outputResourceDigest(ctx, reader, parts, name, buffer)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
first, found := seen[key]
|
|
if !found {
|
|
seen[key] = name
|
|
continue
|
|
}
|
|
aliases[name] = first
|
|
for _, reference := range profiles[name] {
|
|
if indexes[reference.index] == nil {
|
|
indexes[reference.index] = make(map[string]string)
|
|
}
|
|
indexes[reference.index][reference.id] = first
|
|
}
|
|
}
|
|
updates := make(map[string][]byte, len(indexes))
|
|
for _, name := range slices.Sorted(maps.Keys(indexes)) {
|
|
if err := ctx.Err(); err != nil {
|
|
return err
|
|
}
|
|
data, ok := parts[name]
|
|
if !ok {
|
|
if reader == nil {
|
|
return fmt.Errorf("file not found: %s", name)
|
|
}
|
|
var err error
|
|
data, err = reader.readFileViewContext(ctx, name)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
root, err := parseEditorXMLContext(ctx, data)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
var patches []editorXMLPatch
|
|
for _, group := range root.children {
|
|
if !group.matchesOFD("ColorSpaces") {
|
|
continue
|
|
}
|
|
for _, node := range group.children {
|
|
if err := ctx.Err(); err != nil {
|
|
return err
|
|
}
|
|
location := indexes[name][editorResourceID(node.attr("ID"))]
|
|
if !node.matchesOFD("ColorSpace") || location == "" {
|
|
continue
|
|
}
|
|
patch, err := editorXMLAttributePatch(data, node, "Profile", "/"+location)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
patches = append(patches, patch)
|
|
}
|
|
}
|
|
updates[name] = editorPatchXML(data, patches)
|
|
}
|
|
if err := ctx.Err(); err != nil {
|
|
return err
|
|
}
|
|
maps.Copy(parts, updates)
|
|
for name := range aliases {
|
|
removed[name] = true
|
|
delete(parts, name)
|
|
}
|
|
return nil
|
|
}
|