feat(渲染编辑): 完善渲染压缩及文档版本编辑

ofdgo_compression_profiles.go

@@ -0,0 +1,135 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ofdgo
+
+import (
+	"bytes"
+	"context"
+	"crypto/sha256"
+	"fmt"
+	"io"
+	"maps"
+	"slices"
+)
+
+// editorProfileReference 记录颜色配置文件所在的资源索引及颜色空间标识
+type editorProfileReference struct {
+	index string
+	id    string
+}
+
+// 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)
+	buffer := make([]byte, 32*1024)
+	for _, name := range slices.Sorted(maps.Keys(profiles)) {
+		if err := ctx.Err(); err != nil {
+			return err
+		}
+		if protected[name] {
+			continue
+		}
+		var input io.ReadCloser
+		if data, ok := parts[name]; ok {
+			input = io.NopCloser(bytes.NewReader(data))
+		} else {
+			if reader == nil {
+				return fmt.Errorf("file not found: %s", name)
+			}
+			var err error
+			input, err = reader.openFile(name)
+			if err != nil {
+				return err
+			}
+		}
+		hash := sha256.New()
+		_, err := io.CopyBuffer(hash, imageInput{ReadCloser: input, context: ctx}, buffer)
+		closeErr := input.Close()
+		if err != nil {
+			return err
+		}
+		if closeErr != nil {
+			return closeErr
+		}
+		key := [32]byte(hash.Sum(nil))
+		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.readFile(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 {
+				location := indexes[name][editorResourceID(node.attr("ID"))]
+				if !node.matchesOFD("ColorSpace") || location == "" {
+					continue
+				}
+				fragment, err := editorXMLAttribute(data, node, "Profile", "/"+location)
+				if err != nil {
+					return err
+				}
+				patches = append(patches, editorXMLPatch{start: node.start, end: node.end, data: fragment})
+			}
+		}
+		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
+}