CBZOptimizer/cbz/cbz_loader.go

package cbz

import (
	"CBZOptimizer/packer"
	"archive/zip"
	"bytes"
	"fmt"
	"io"
	"io/ioutil"
	"path/filepath"
	"strings"
)

func LoadChapter(filePath string) (*packer.Chapter, error) {
	// Open the .cbz file
	r, err := zip.OpenReader(filePath)
	if err != nil {
		return nil, fmt.Errorf("failed to open .cbz file: %w", err)
	}
	defer r.Close()

	chapter := &packer.Chapter{
		FilePath: filePath,
	}

	for _, f := range r.File {
		if !f.FileInfo().IsDir() {
			// Open the file inside the zip
			rc, err := f.Open()
			if err != nil {
				return nil, fmt.Errorf("failed to open file inside .cbz: %w", err)
			}

			// Determine the file extension
			ext := strings.ToLower(filepath.Ext(f.Name))

			if ext == ".xml" && strings.ToLower(filepath.Base(f.Name)) == "comicinfo.xml" {
				// Read the ComicInfo.xml file content
				xmlContent, err := ioutil.ReadAll(rc)
				if err != nil {
					rc.Close()
					return nil, fmt.Errorf("failed to read ComicInfo.xml content: %w", err)
				}
				chapter.ComicInfoXml = string(xmlContent)
			} else {
				// Read the file contents for page
				buf := new(bytes.Buffer)
				_, err = io.Copy(buf, rc)
				if err != nil {
					rc.Close()
					return nil, fmt.Errorf("failed to read file contents: %w", err)
				}

				// Create a new Page object
				page := &packer.Page{
					Index:      uint16(len(chapter.Pages)), // Simple index based on order
					Extension:  ext,
					Size:       uint64(buf.Len()),
					Contents:   buf,
					IsSplitted: false,
				}

				// Add the page to the chapter
				chapter.Pages = append(chapter.Pages, page)
			}
			rc.Close()
		}
	}

	return chapter, nil
}