feat: init with converting cbz files

cbz/cbz_creator.go

@@ -0,0 +1,61 @@
+package cbz
+
+import (
+	"CBZOptimizer/packer"
+	"archive/zip"
+	"fmt"
+	"os"
+)
+
+func WriteChapterToCBZ(chapter *packer.Chapter, outputFilePath string) error {
+	// Create a new ZIP file
+	zipFile, err := os.Create(outputFilePath)
+	if err != nil {
+		return fmt.Errorf("failed to create .cbz file: %w", err)
+	}
+	defer zipFile.Close()
+
+	// Create a new ZIP writer
+	zipWriter := zip.NewWriter(zipFile)
+	defer zipWriter.Close()
+
+	// Write each page to the ZIP archive
+	for _, page := range chapter.Pages {
+		// Construct the file name for the page
+		var fileName string
+		if page.IsSplitted {
+			// Use the format page%03d-%02d for split pages
+			fileName = fmt.Sprintf("page_%03d-%02d%s", page.Index, page.SplitPartIndex, page.Extension)
+		} else {
+			// Use the format page%03d for non-split pages
+			fileName = fmt.Sprintf("page_%03d%s", page.Index, page.Extension)
+		}
+
+		// Create a new file in the ZIP archive
+		fileWriter, err := zipWriter.Create(fileName)
+		if err != nil {
+			return fmt.Errorf("failed to create file in .cbz: %w", err)
+		}
+
+		// Write the page contents to the file
+		_, err = fileWriter.Write(page.Contents.Bytes())
+		if err != nil {
+			return fmt.Errorf("failed to write page contents: %w", err)
+		}
+	}
+
+	// Optionally, write the ComicInfo.xml file if present
+	if chapter.ComicInfoXml != "" {
+		comicInfoWriter, err := zipWriter.Create("ComicInfo.xml")
+		if err != nil {
+			return fmt.Errorf("failed to create ComicInfo.xml in .cbz: %w", err)
+		}
+
+		_, err = comicInfoWriter.Write([]byte(chapter.ComicInfoXml))
+		if err != nil {
+			return fmt.Errorf("failed to write ComicInfo.xml contents: %w", err)
+		}
+	}
+
+	return nil
+}