mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-29 15:06:46 +08:00
459 lines
16 KiB
Go
459 lines
16 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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"context"
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"fmt"
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"io"
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codecpdf "github.com/xiaoqidun/ofdgo/internal/codec/pdf"
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"github.com/xiaoqidun/pdfgo"
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)
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// pdfObjectChunkLimit 限制导入暂存片段的容量，不限制页面对象数量
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const pdfObjectChunkLimit = 256
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// ErrPDFPassword 表示PDF需要正确的用户或所有者密码
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var ErrPDFPassword = pdfgo.ErrPassword
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// PDFImportOptions 指定PDF转换的密码、运行时后端、进度通知与检查策略
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// Password默认使用PDF安全处理器编码，PasswordUTF8启用UTF-8输入及标准密码准备，空值尝试空密码
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// Strict禁止恢复缺失资源或丢失内容语义，默认在报告中记录警告
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// RendererOptions复用渲染器字体来源和后端配置，Backends优先于其中的后端设置
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// RasterDPI指定局部合成与三维绘制精度，0沿用渲染器DPI，默认300dpi，Strict禁用局部合成
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// OnProgress按open、pages、convert及write.*阶段报告进度，total为0表示总量未知
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// ResolveFile读取PDF引用的外部媒体、附件、页面及三维纹理，默认不访问网络或本地路径
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// ResolveReference可提供已解密的引用页面，目标阅读器由调用方维护
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// Halftones提供只读设备命名网屏，所属阅读器由调用方维护，连续色调输出不网屏化
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// Compression配置转换输出，有损模式按图片实际尺寸降采样，原始及无损模式保持完整采样
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type PDFImportOptions struct {
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Password []byte
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PasswordUTF8 bool
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Backends *RenderBackends
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RendererOptions []RendererOption
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Progress func(int) error
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OnProgress func(stage string, completed, total int) error
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Strict bool
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RasterDPI float64
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ResolveFile pdfgo.FileResolver
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ResolveReference pdfgo.ReferenceResolver
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Halftones map[string]*pdfgo.Halftone
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Compression CompressionOptions
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}
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// PDFImportReport 汇总转换页数、对象数、链接数和转换警告
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type PDFImportReport struct {
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Pages int
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TextObjects int
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PathObjects int
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ImageObjects int
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Links int
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Warnings []pdfgo.Diagnostic
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}
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// pdfImporter 保存单次转换的对象与资源状态
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type pdfImporter struct {
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ctx context.Context
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reader *pdfgo.Reader
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editor *Editor
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renderer *Renderer
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report PDFImportReport
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matrix pdfgo.Matrix
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page int
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pageActionPage int
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fontIDs map[*pdfgo.Font]string
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fonts map[*pdfgo.Font]*pdfImportedFont
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symbolFonts map[*pdfgo.Font]*pdfImportedFont
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fontWarnings map[string]bool
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clipTexts map[*pdfgo.TextClip][]TextObject
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clipPaths *renderCache[[32]byte, pdfClipPath]
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cmykSpace string
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rgbSpace string
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iccSpaces map[pdfICCKey]string
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objects *pdfObjectBuffer
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formResources *pdfFormCache
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validation *editorValidation
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pages map[pdfgo.Reference]*pdfgo.Page
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pageOrder []*pdfgo.Page
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pageIDs map[pdfgo.Reference]string
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pageIndexes map[pdfgo.Reference]int
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destinationBoxes map[pdfgo.Reference]Box
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imageIDs map[pdfImageKey][]pdfImageResource
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imageContents *renderCache[pdfImageContentKey, pdfImageContent]
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attachmentIDs map[pdfAttachmentKey]string
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modelAttachments map[*pdfgo.Stream]string
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mediaResources map[pdfMediaFileKey]pdfMediaResource
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mediaInstances map[pdfMediaInstanceKey]pdfMediaResource
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movieBounds map[*Movie]Box
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renditions *pdfRenditionImport
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maskClips map[*pdfgo.SoftMask]pdfgo.Path
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pageBox pdfgo.Rectangle
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pageWidth float64
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pageHeight float64
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pendingPath *pdfgo.PathMark
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warning func(pdfgo.Diagnostic)
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rasterDPI float64
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rasterWarned bool
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compositeCache *pdfCompositeCache
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compositeNodes []pdfCompositeNode
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compositeSpace *pdfgo.ColorSpace
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patternCells *renderCache[pdfPatternCellKey, *Pattern]
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annotationData []byte
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resolveFile pdfgo.FileResolver
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resolveReference pdfgo.ReferenceResolver
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references *codecpdf.ReferenceCache
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halftoneWarnings map[*pdfgo.Halftone]bool
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halftones map[string]*pdfgo.Halftone
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transferBackdrop bool
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transferModel pdfgo.Name
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compression CompressionOptions
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}
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// pdfObjectBuffer 分块收集导入对象，提交前只整理一次连续数据
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type pdfObjectBuffer struct {
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parts [][]GraphicObject
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size int
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}
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// ImportPDF 将PDF内容转换为独立OFD编辑文档，失败时不返回部分结果
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// 入参: ctx 取消上下文, source PDF数据, size 字节数, options 转换选项
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// 返回: *Editor 编辑文档, PDFImportReport 转换统计, error 错误信息
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func ImportPDF(ctx context.Context, source io.ReaderAt, size int64, options PDFImportOptions) (*Editor, PDFImportReport, error) {
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if err := ctx.Err(); err != nil {
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return nil, PDFImportReport{}, err
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}
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if err := options.Compression.Validate(); err != nil {
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return nil, PDFImportReport{}, err
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}
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if !finite(options.RasterDPI) || options.RasterDPI < 0 {
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return nil, PDFImportReport{}, fmt.Errorf("invalid PDF raster DPI")
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}
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renderer := NewRenderer(&Reader{}, options.RendererOptions...)
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if options.Backends != nil {
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WithRenderBackends(*options.Backends)(renderer)
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}
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if options.RasterDPI != 0 {
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renderer.DPI = options.RasterDPI
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}
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if !finite(renderer.DPI) || renderer.DPI <= 0 {
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return nil, PDFImportReport{}, fmt.Errorf("invalid PDF raster DPI")
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}
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progress := editorProgress(options.OnProgress).withContext(ctx)
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if err := progress.report("open", 0, 0); err != nil {
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return nil, PDFImportReport{}, err
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}
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editor := NewEditor()
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editor.SetRenderBackends(renderer.Backends())
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editor.fontDirs, editor.fontFS = renderer.FontSources()
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editor.fontSourcesCache = renderer.fontSourcesCache
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importer := pdfImporter{ctx: ctx, editor: editor, renderer: renderer, rasterDPI: renderer.DPI, fontIDs: map[*pdfgo.Font]string{}, fonts: map[*pdfgo.Font]*pdfImportedFont{}, pages: map[pdfgo.Reference]*pdfgo.Page{}, pageIDs: map[pdfgo.Reference]string{}}
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readOptions := pdfgo.ReaderOptions{Password: options.Password, PasswordUTF8: options.PasswordUTF8, ShapeText: importer.shapePDFText}
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var diagnostics []pdfgo.Diagnostic
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var readWarning func(pdfgo.Diagnostic)
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if !options.Strict {
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readWarning = func(diagnostic pdfgo.Diagnostic) { diagnostics = append(diagnostics, diagnostic) }
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readOptions.Warning = func(diagnostic pdfgo.Diagnostic) { readWarning(diagnostic) }
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}
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reader, err := pdfgo.NewReaderWithOptions(convertReader{context: ctx, source: source}, size, readOptions)
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if err != nil {
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return nil, PDFImportReport{}, err
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}
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defer reader.Close()
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importer.reader = reader
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outputIntents, err := reader.OutputIntents()
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if err != nil {
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return nil, PDFImportReport{}, fmt.Errorf("import PDF output intents: %w", err)
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}
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importer.report.Warnings = diagnostics
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if len(outputIntents) != 0 {
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if options.Strict {
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return nil, PDFImportReport{}, &pdfgo.UnsupportedError{Feature: "PDF output intent conversion"}
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}
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importer.report.Warnings = append(importer.report.Warnings, pdfgo.Diagnostic{Message: "PDF output intents not transferred to OFD"})
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}
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importer.pageIndexes = make(map[pdfgo.Reference]int)
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importer.resolveFile = options.ResolveFile
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importer.resolveReference = options.ResolveReference
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importer.halftones = options.Halftones
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importer.compression = options.Compression
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importer.references = &codecpdf.ReferenceCache{}
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defer importer.references.Close()
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importer.halftoneWarnings = make(map[*pdfgo.Halftone]bool)
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if security := reader.Encryption(); security != nil && !security.Owner && security.Permissions&0xf3c != 0xf3c {
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if options.Strict {
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return nil, PDFImportReport{}, &pdfgo.UnsupportedError{Feature: "PDF access permission conversion"}
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}
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importer.report.Warnings = append(importer.report.Warnings, pdfgo.Diagnostic{Message: "PDF access permissions not transferred to OFD"})
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}
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if !options.Strict {
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importer.warning = func(warning pdfgo.Diagnostic) {
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warning.Page = importer.page + 1
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importer.report.Warnings = append(importer.report.Warnings, warning)
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}
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readWarning = importer.warning
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}
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if err := progress.report("pages", 0, 0); err != nil {
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return nil, PDFImportReport{}, err
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}
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err = reader.WalkPages(ctx, func(index int, page *pdfgo.Page) error {
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_, width, height := codecpdf.PageMatrix(page)
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if _, err := editor.AddPage(width, height); err != nil {
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return err
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}
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importer.pages[page.Reference] = page
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importer.pageOrder = append(importer.pageOrder, page)
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importer.pageIDs[page.Reference] = editor.pages[index].ID
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importer.pageIndexes[page.Reference] = index
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return progress.report("pages", index+1, 0)
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})
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if err != nil {
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return nil, PDFImportReport{}, err
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}
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if len(editor.pages) != 0 {
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importer.page = -1
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if err := importer.documentAttachments(ctx); err != nil {
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return nil, PDFImportReport{}, fmt.Errorf("import PDF attachments: %w", err)
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}
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if err := importer.outlines(ctx); err != nil {
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return nil, PDFImportReport{}, fmt.Errorf("import PDF outlines: %w", err)
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}
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if err := importer.documentOpenActions(ctx); err != nil {
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return nil, PDFImportReport{}, fmt.Errorf("import PDF document actions: %w", err)
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}
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importer.page = 0
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}
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if err := progress.report("convert", 0, len(editor.pages)); err != nil {
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return nil, PDFImportReport{}, err
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}
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err = reader.WalkPages(ctx, func(index int, page *pdfgo.Page) error {
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matrix, width, height := codecpdf.PageMatrix(page)
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importer.matrix = matrix
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importer.page = index
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importer.rasterWarned = false
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importer.pageBox = page.CropBox
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importer.pageWidth = width
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importer.pageHeight = height
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importer.maskClips = make(map[*pdfgo.SoftMask]pdfgo.Path)
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importer.compositeCache = nil
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importer.compositeNodes = nil
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importer.compositeSpace = nil
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importer.patternCells = nil
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importer.clipTexts = make(map[*pdfgo.TextClip][]TextObject)
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importer.clipPaths = nil
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importer.annotationData = nil
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if err := importer.pageOpenActions(ctx, page); err != nil {
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return fmt.Errorf("import PDF page %d actions: %w", index+1, err)
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}
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if err := importer.compositePage(nil, func(visitor pdfgo.Visitor) error { return reader.WalkPage(ctx, page, visitor) }); err != nil {
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return fmt.Errorf("import PDF page %d: %w", index+1, err)
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}
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if err := importer.flushPath(); err != nil {
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return fmt.Errorf("import PDF page %d: %w", index+1, err)
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}
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if err := importer.annotations(ctx, page, options.Strict); err != nil {
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return fmt.Errorf("import PDF page %d: %w", index+1, err)
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}
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if len(importer.annotationData) != 0 {
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if err := editor.appendAnnotations(index, importer.annotationData, true); err != nil {
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return fmt.Errorf("import PDF page %d: %w", index+1, err)
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}
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importer.annotationData = nil
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}
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if err := importer.commitObjects(); err != nil {
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return fmt.Errorf("import PDF page %d: %w", index+1, err)
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}
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importer.report.Pages++
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if err := progress.report("convert", index+1, len(editor.pages)); err != nil {
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return err
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}
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if options.Progress != nil {
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if err := options.Progress(index + 1); err != nil {
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return err
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}
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}
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return ctx.Err()
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})
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if err != nil {
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return nil, PDFImportReport{}, err
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}
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if importer.report.Pages == 0 {
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return nil, PDFImportReport{}, fmt.Errorf("PDF contains no pages")
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}
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return editor, importer.report, nil
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}
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// ConvertPDF 将PDF转换并写入OFD，转换阶段失败时不写入目标
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// 入参: ctx 取消上下文, source PDF数据, size 字节数, output OFD输出, options 转换选项
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// 返回: PDFImportReport 转换统计, error 错误信息
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func ConvertPDF(ctx context.Context, source io.ReaderAt, size int64, output io.Writer, options PDFImportOptions) (PDFImportReport, error) {
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editor, report, err := ImportPDF(ctx, source, size, options)
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if err != nil {
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return PDFImportReport{}, err
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}
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if err := ctx.Err(); err != nil {
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return PDFImportReport{}, err
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}
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if options.OnProgress != nil {
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if err := options.OnProgress("write", 0, 0); err != nil {
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return PDFImportReport{}, err
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}
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}
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editor.OnWriteProgress = func(stage string, completed, total int) error {
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if err := ctx.Err(); err != nil {
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return err
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}
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if options.OnProgress != nil {
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return options.OnProgress("write."+stage, completed, total)
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}
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return nil
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}
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_, err = editor.WriteToWithOptions(ctx, output, WriteOptions{Compression: options.Compression})
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return report, err
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}
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// referencePage 衔接PDF访问器与当前导入会话的引用文档缓存
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// 入参: ctx 取消上下文, source 来源文档, reference 引用目标
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// 返回: *pdfgo.Page 目标页面，不可用时为空, error 取消或调用方解析错误
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func (p *pdfImporter) referencePage(ctx context.Context, source *pdfgo.Reader, reference pdfgo.ReferenceXObject) (*pdfgo.Page, error) {
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if p.references == nil {
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p.references = &codecpdf.ReferenceCache{}
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}
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return p.references.Resolve(ctx, source, reference, p.resolveFile, p.resolveReference, p.warning)
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}
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// objectValidation 在单次导入中共享不可变资源的校验结果，隔离局部编辑器
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// 返回: *editorValidation 当前编辑器的构建校验会话
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func (p *pdfImporter) objectValidation() *editorValidation {
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if p.validation == nil || p.validation.Editor != p.editor {
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p.validation = &editorValidation{Editor: p.editor}
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}
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return p.validation
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}
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// appendObject 追加本次导入对象，按需建立独立暂存缓冲
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// 入参: object 独立导入对象
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func (p *pdfImporter) appendObject(object GraphicObject) {
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if p.objects == nil {
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p.objects = &pdfObjectBuffer{}
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}
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p.objects.append(object)
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}
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// append 追加对象，小批量连续存储，超过阈值后不复制前序片段
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// 入参: object 独立对象
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func (b *pdfObjectBuffer) append(object GraphicObject) {
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index := len(b.parts) - 1
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if index == 0 && len(b.parts[0]) == cap(b.parts[0]) && cap(b.parts[0]) < pdfObjectChunkLimit {
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part := b.parts[0]
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next := make([]GraphicObject, len(part), min(pdfObjectChunkLimit, max(1, cap(part)*2)))
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copy(next, part)
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b.parts[0] = next
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}
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if index < 0 || len(b.parts[index]) == cap(b.parts[index]) {
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capacity := pdfObjectChunkLimit
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if index < 0 {
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capacity = 1
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}
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b.parts = append(b.parts, make([]GraphicObject, 0, capacity))
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index++
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}
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b.parts[index] = append(b.parts[index], object)
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b.size++
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}
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// len 获取暂存对象数量，空缓冲返回零
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// 返回: int 对象数量
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func (b *pdfObjectBuffer) len() int {
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if b == nil {
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return 0
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}
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return b.size
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}
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// truncate 回滚到已有对象位置，清理丢弃对象及片段引用
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// 入参: size 保留对象数量
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func (b *pdfObjectBuffer) truncate(size int) {
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if size < 0 || size > b.len() {
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panic("invalid PDF object buffer size")
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}
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if size == b.len() {
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return
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}
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remaining := size
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for index, part := range b.parts {
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if remaining <= len(part) {
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clear(part[remaining:])
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b.parts[index] = part[:remaining]
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clear(b.parts[index+1:])
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b.parts = b.parts[:index+1]
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b.size = size
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return
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}
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remaining -= len(part)
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}
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}
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// data 按绘制顺序整理独立对象数组，取消时保留原片段供重试
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// 入参: ctx 取消上下文
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// 返回: []GraphicObject 暂存数据, error 取消错误
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func (b *pdfObjectBuffer) data(ctx context.Context) ([]GraphicObject, error) {
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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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if b.len() == 0 {
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return nil, nil
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}
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if len(b.parts) == 1 {
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return b.parts[0][:b.size:b.size], nil
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}
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objects := make([]GraphicObject, b.size)
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offset := 0
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for _, part := range b.parts {
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if err := ctx.Err(); err != nil {
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return nil, err
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}
|
|
offset += copy(objects[offset:], part)
|
|
}
|
|
if err := ctx.Err(); err != nil {
|
|
return nil, err
|
|
}
|
|
b.parts[0] = objects
|
|
clear(b.parts[1:])
|
|
b.parts = b.parts[:1]
|
|
return objects, nil
|
|
}
|
|
|
|
// commitObjects 将当前页面待转换对象写入编辑文档
|
|
// 返回: error 对象写入错误
|
|
func (p *pdfImporter) commitObjects() error {
|
|
if p.objects.len() == 0 {
|
|
return nil
|
|
}
|
|
objects, err := p.objects.data(p.ctx)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
objects, err = p.sharedClipObjects(objects)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if err := p.objectValidation().appendOwnedObjects(p.ctx, p.page, objects); err != nil {
|
|
return err
|
|
}
|
|
p.objects = nil
|
|
return nil
|
|
}
|