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Use 7zip as archiver and merge tars instead of extracting
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,78 @@ | ||
| import 'dart:io'; | ||
|
|
||
| /// API for 7-Zip archive operations | ||
| class ArchiveApi { | ||
| static const _exe = './7zip/7za.exe'; | ||
|
|
||
| /// Get current path | ||
| static Future<String> get currentPath async { | ||
| // Get current path | ||
| try { | ||
| final result = await Process.run("cmd", ["/c", "cd"], runInShell: true); | ||
| return result.stdout.toString(); | ||
| } catch (e) { | ||
| throw Exception('Failed to get current path: $e'); | ||
| } | ||
| } | ||
|
|
||
| /// Extracts the archive at [archivePath] to [destinationPath] | ||
| static Future<void> extract( | ||
| String archivePath, String destinationPath) async { | ||
| // 7zr.exe x layer2.tar.gz -olayer | ||
| // Extract archive | ||
| try { | ||
| await Process.run(_exe, ['x', archivePath, '-o$destinationPath']); | ||
| } catch (e) { | ||
| throw Exception('Failed to extract archive: $e'); | ||
| } | ||
| } | ||
|
|
||
| /// Merge the archives at [archivePaths] into [destinationPath] | ||
| static Future<void> merge( | ||
| List<String> archivePaths, String destinationPath) async { | ||
| // Merge archives | ||
| try { | ||
| // remove trailing zeros from the files | ||
| final outputFile = File(destinationPath); | ||
| for (var i = 0; i < archivePaths.length; i++) { | ||
| final fileName = archivePaths[i]; | ||
| // Read file as byte stream | ||
| final file = File(fileName); | ||
| final bytes = await file.readAsBytes(); | ||
| final length = bytes.length; | ||
|
|
||
| // Last layer | ||
| if (i == archivePaths.length - 1) { | ||
| await outputFile.writeAsBytes(bytes); | ||
| break; | ||
| } | ||
|
|
||
| // Remove trailing zeros | ||
| int lastBytePos = 0; | ||
| for (var i = length - 1; i >= 0; i--) { | ||
| if (bytes[i] != 0) { | ||
| lastBytePos = i; | ||
| break; | ||
| } | ||
| } | ||
|
|
||
| // Write to new file | ||
| await outputFile.writeAsBytes(bytes.sublist(0, lastBytePos + 1)); | ||
| } | ||
| } catch (e) { | ||
| throw Exception('Failed to merge archives: $e'); | ||
| } | ||
| } | ||
|
|
||
| /// Compress the tar archive at [filePath] to [destinationPath] | ||
| static Future<void> compress(String filePath, String destinationPath) async { | ||
| // 7zr.exe a -tgzip full_image.tar.gz full_image.tar | ||
| // Compress tar archive | ||
| try { | ||
| // 7zr.exe a -ttar combined_image.tar merged\* | ||
| await Process.run(_exe, ['a', '-tgzip', destinationPath, filePath]); | ||
| } catch (e) { | ||
| throw Exception('Failed to compress tar archive: $e'); | ||
| } | ||
| } | ||
| } |
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