mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-30 01:27:26 +08:00
316 lines
9.2 KiB
Go
316 lines
9.2 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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"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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"github.com/xiaoqidun/pdfgo"
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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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// 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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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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// 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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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 data, ok := parts[name]; ok {
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return data, nil
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}
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return reader.readFile(name)
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}
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refs := editorResourceRefs{ids: make(map[string]bool), files: make(map[string]bool), fonts: make(map[string]*editorFontUsage)}
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var resources []string
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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 := strings.ToLower(cleanPackagePath(name))
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if removed[key] || strings.HasSuffix(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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data, replaced := parts[name]
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if known, ok := generated[name]; ok && replaced && known.refs != nil && known.matches(data) {
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refs.merge(known.refs)
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continue
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}
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var input io.ReadCloser
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if replaced {
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if known := generated[name]; data == nil && known.staged != nil {
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input = known.staged.open()
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} else {
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input = io.NopCloser(bytes.NewReader(data))
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}
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} else {
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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 err
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}
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}
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resource, safe := refs.scan(imageInput{ReadCloser: input, context: e.output.ctx}, name)
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input.Close()
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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 !safe {
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return nil
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}
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if resource {
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resources = append(resources, name)
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}
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}
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type resourceFile struct{ key, role string }
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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 := parseEditorXML(data)
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if err != nil {
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return err
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}
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for _, group := range root.children {
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for _, node := range group.children {
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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 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 != strings.ToLower(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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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[string]map[[32]byte]string)
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imageResults := make(map[outputImageKey][]byte)
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for _, key := range slices.Sorted(maps.Keys(actual)) {
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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).report("compress", e.output.completed, 0); err != nil {
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return err
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}
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if data, ok := parts[actual[key]]; ok && len(data) > outputOptimizationBufferLimit {
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continue
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}
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if reader != nil && parts[actual[key]] == nil {
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if file, ok := reader.packageFile(actual[key]); ok && file.UncompressedSize64 > outputOptimizationBufferLimit {
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continue
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}
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}
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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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if len(data) > outputOptimizationBufferLimit {
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continue
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}
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if role == "MediaFile" {
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options := e.output.options
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if !e.output.images[key] {
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options.Mode = CompressionLossless
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}
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demand := e.output.sizes[key]
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if options.Mode != CompressionLossy {
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options = CompressionOptions{Mode: options.Mode}
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demand = image.Point{}
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}
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cacheKey := outputImageKey{hash: sha256.Sum256(data), 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 = pdfgo.OptimizeImageResource(e.output.ctx, data, options, demand)
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if err == nil {
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imageResults[cacheKey] = nil
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if len(candidate) < len(data) {
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imageResults[cacheKey] = candidate
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}
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}
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}
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if err != nil {
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if e.output.ctx.Err() != nil {
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return e.output.ctx.Err()
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}
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} else if candidate != nil && len(candidate) < len(data) {
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data = candidate
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parts[actual[key]] = data
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}
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if bytes.HasPrefix(data, []byte{255, 216}) {
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formats[key] = "JPEG"
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ext := path.Ext(actual[key])
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if !strings.EqualFold(ext, ".jpg") && !strings.EqualFold(ext, ".jpeg") {
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stem := strings.TrimSuffix(actual[key], ext)
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name := stem + ".jpg"
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for n := 1; reserved[strings.ToLower(name)]; n++ {
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name = fmt.Sprintf("%s-%d.jpg", stem, n)
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}
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reserved[strings.ToLower(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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if seen[role] == nil {
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seen[role] = make(map[[32]byte]string)
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}
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hash := sha256.Sum256(data)
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if first, ok := seen[role][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[role][hash] = key
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}
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}
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}
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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 := parseEditorXML(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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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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fragment := data[node.start:node.end]
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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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patch := editorXMLContent(data, file, escaped.Bytes())
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patch.start -= node.start
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patch.end -= node.start
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fragment = editorPatchXML(fragment, []editorXMLPatch{patch})
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}
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if field == "MediaFile" && formats[key] != "" && node.attr("Format") != formats[key] {
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parsed, err := parseEditorXML(fragment)
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if err != nil {
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return err
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}
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fragment, err = editorXMLAttribute(fragment, parsed, "Format", formats[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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if !bytes.Equal(fragment, data[node.start:node.end]) {
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patches = append(patches, editorXMLPatch{start: node.start, end: node.end, data: fragment})
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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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