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/*
* GodoOS - A lightweight cloud desktop
* Copyright (C) 2024 https://godoos.com
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 2.1 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package convert
import (
"archive/zip"
"bytes"
"fmt"
"io"
"os"
"strings"
)
// ConvertPptx converts an MS PowerPoint pptx file to text.
func ConvertPptx(r io.Reader) (string, error) {
var size int64
// Common case: if the reader is a file (or trivial wrapper), avoid
// loading it all into memory.
var ra io.ReaderAt
if f, ok := r.(interface {
io.ReaderAt
Stat() (os.FileInfo, error)
}); ok {
si, err := f.Stat()
if err != nil {
return "", err
}
size = si.Size()
ra = f
} else {
b, err := io.ReadAll(r)
if err != nil {
return "", nil
}
size = int64(len(b))
ra = bytes.NewReader(b)
}
zr, err := zip.NewReader(ra, size)
if err != nil {
return "", fmt.Errorf("could not unzip: %v", err)
}
zipFiles := mapZipFiles(zr.File)
contentTypeDefinition, err := getContentTypeDefinition(zipFiles["[Content_Types].xml"])
if err != nil {
return "", err
}
var textBody string
for _, override := range contentTypeDefinition.Overrides {
f := zipFiles[override.PartName]
switch override.ContentType {
case "application/vnd.openxmlformats-officedocument.presentationml.slide+xml",
"application/vnd.openxmlformats-officedocument.drawingml.diagramData+xml":
body, err := parseDocxText(f)
if err != nil {
return "", fmt.Errorf("could not parse pptx: %v", err)
}
textBody += body + "\n"
}
}
// 在成功解析ZIP文件后,添加图片提取逻辑
images, err := findImagesInZip(zr)
if err != nil {
fmt.Printf("Error extracting images: %v", err)
}
fmt.Printf("Images: %v", images)
return strings.TrimSuffix(textBody, "\n"), nil
}