mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-29 17:27:08 +08:00
109 lines
3.5 KiB
Go
109 lines
3.5 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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"bufio"
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"bytes"
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"context"
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"encoding/xml"
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"io"
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)
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// editorResourceElement 返回标准资源集合中的声明元素名称
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// 入参: group 资源集合名称
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// 返回: string 声明元素名称，未知集合返回空值
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func editorResourceElement(group string) string {
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switch group {
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case "Fonts":
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return "Font"
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case "MultiMedias":
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return "MultiMedia"
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case "ColorSpaces":
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return "ColorSpace"
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case "DrawParams":
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return "DrawParam"
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case "CompositeGraphicUnits":
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return "CompositeGraphicUnit"
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}
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return ""
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}
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// editorResourceDefinitions 单次流式读取资源声明依赖，保留历史索引和非图像媒体
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// 入参: ctx 取消上下文, data 资源索引内容, name 文件路径, source 扫描结果, preserved 是否保留全部声明
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// 返回: *editorResourceRefs 含声明依赖的引用，无法安全分析时为空, error 解析或取消错误
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func editorResourceDefinitions(ctx context.Context, data []byte, name string, source *editorResourceRefs, preserved bool) (*editorResourceRefs, error) {
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result := *source
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result.ids, result.fonts = make(map[string]bool), nil
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result.definitions = make(map[string]*editorResourceRefs)
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outer := &editorResourceRefs{ids: make(map[string]bool), files: make(map[string]bool), fonts: make(map[string]*editorFontUsage)}
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scan := editorReferenceScan{refs: outer, name: name, safe: true}
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input := bufio.NewReader(imageInput{ReadCloser: io.NopCloser(bytes.NewReader(data)), context: ctx})
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if found, err := editorXMLPrefix(input); err != nil || !found {
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return nil, err
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}
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decoder := xml.NewDecoder(input)
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for {
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if err := ctx.Err(); err != nil {
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return nil, err
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}
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token, err := decoder.Token()
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if err == io.EOF {
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if !scan.seen || len(scan.stack) != 0 {
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return nil, nil
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}
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return &result, ctx.Err()
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}
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if err != nil {
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return nil, err
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}
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depth := len(scan.stack)
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if node, ok := token.(xml.StartElement); ok {
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if depth == 0 && node.Name.Local != "Res" || depth == 1 && editorResourceElement(node.Name.Local) == "" {
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return nil, nil
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}
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if depth == 2 {
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kind := editorResourceElement(scan.stack[1])
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var id, mediaType string
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for _, attr := range node.Attr {
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if attr.Name.Space == "" {
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switch attr.Name.Local {
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case "ID":
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id = editorResourceID(attr.Value)
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case "Type":
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mediaType = attr.Value
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}
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}
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}
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if node.Name.Local != kind || id == "" || result.definitions[id] != nil {
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return nil, nil
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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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result.definitions[id] = refs
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scan.refs = refs
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if preserved || kind == "MultiMedia" && mediaType != "Image" {
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result.ids[id] = true
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}
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}
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}
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if !scan.accept(token) {
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return nil, ctx.Err()
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}
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if _, end := token.(xml.EndElement); end && depth == 3 {
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scan.refs = outer
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}
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}
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}
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