feat: init with converting cbz files

cbz/cbz_loader.go

@@ -0,0 +1,71 @@
+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
+}