szip: add support for unpacking zip archives and simple zip files

thirdparty/zip/zip.c

@@ -1007,6 +1007,10 @@ int zip_extract(const char *zipname, const char *dir,
   return status;
 }
 
+int zip_extract_without_callback(const char *zipname, const char *dir) {
+  return zip_extract(zipname, dir, NULL, NULL);
+} // for simple V bind ¯\_(ツ)_/¯
+
 int zip_extract_stream(const char *stream, size_t size, const char *dir,
                        int (*on_extract)(const char *filename, void *arg),
                        void *arg) {

thirdparty/zip/zip.h

@@ -312,6 +312,8 @@ extern int zip_create(const char *zipname, const char *filenames[], size_t len);
 extern int zip_extract(const char *zipname, const char *dir,
                        int (*on_extract_entry)(const char *filename, void *arg),
                        void *arg);
+// temporary working unzip solution
+extern int zip_extract_without_callback(const char *zipname, const char *dir);
 
 /**
  * Extracts a zip archive stream into directory.

vlib/szip/szip.v

@@ -39,6 +39,8 @@ fn C.zip_entry_fread(&Zip, byteptr) int
 
 fn C.zip_total_entries(&Zip) int
 
+fn C.zip_extract_without_callback(charptr, charptr) int
+
 // CompressionLevel lists compression levels, see in "thirdparty/zip/miniz.h"
 pub enum CompressionLevel {
 	no_compression = 0
@@ -201,16 +203,69 @@ pub fn (mut zentry Zip) extract_entry(path string) ? {
 	}
 }
 
-/*
+
-extract extracts the current zip entry using a callback function (on_extract).
+// extract zip file to directory
-fn (mut zentry Zip) extract(path string) bool {
+pub fn extract_zip_to_dir(file string, dir string) ?bool {
-	if C.access(path.str, 0) == -1 {
+	if C.access(dir.str, 0) == -1 {
-		return false
+		return error('szip: cannot open directory for extracting, directory not exists')
-		// return error('szip: cannot open directory for extracting, directory not exists')
 	}
-	res := C.zip_extract(zentry, path.str, 0, 0)
+	res := C.zip_extract_without_callback(charptr(file.str), charptr(dir.str))
 	return res == 0
 }
+
+// zip files (full path) to zip file
+pub fn zip_files(path_to_file []string, path_to_export_zip string) ? {
+
+	// open or create new zip
+	mut zip := szip.open(path_to_export_zip, .no_compression, .write) or { panic(err) }
+
+	// add all files from the directory to the archive
+	for file in path_to_file {
+
+		// add file to zip
+		zip.open_entry(os.base(file)) or { panic(err) }
+		file_as_byte := os.read_bytes(file) or { panic(err) }
+        zip.write_entry(file_as_byte) or { panic(err) }
+
+        zip.close_entry()
+	}
+
+	// close zip
+	defer {
+		zip.close()
+	}
+}
+
+/*
+
+TODO add 
+// zip all files in directory to zip file
+pub fn zip_folder(path_to_dir string, path_to_export_zip string) {
+
+	// get list files from directory
+	files := os.ls(path_to_dir) or { panic(err) }
+
+	// open or create new zip
+	mut zip := szip.open(path_to_export_zip, .no_compression, .write) or { panic(err) }
+
+	// add all files from the directory to the archive
+	for file in files {
+		eprintln('Zipping $file to ${path_to_export_zip}...')
+		println(path_to_dir + file)
+
+		// add file to zip
+		zip.open_entry(file) or { panic(err) }
+		file_as_byte := os.read_bytes(path_to_dir + '/'+ file) or { panic(err) }
+        zip.write_entry(file_as_byte) or { panic(err) }
+
+        zip.close_entry()
+	}
+
+	// close zip
+	zip.close()
+
+	eprintln('Successfully')
+}
 */
 
 // total returns the number of all entries (files and directories) in the zip archive.

vlib/szip/szip_test.v

@@ -2,12 +2,36 @@ import szip
 import os
 
 fn test_szip() {
-	mut z := szip.open('test_compile.zip', .best_speed, .write) or {
+
-		assert false
+// create temp files for zip/unzip test
-		return
+	test_path := 'zip files'
-	}
+	test_out_zip := 'v_test_zip.zip'
-	defer {
+	
-		z.close()
+	os.mkdir(test_path) or { panic(err) }
-		os.rm('test_compile.zip') or { }
+	os.write_file(test_path + os.path_separator + 'file_1.txt', 'file one') or { panic(err) }
+	os.write_file(test_path + os.path_separator + 'file_2.txt', 'file file two') or { panic(err) }
+
+	// get list files from directory
+	mut files := os.ls(test_path) or { panic(err) }
+	for mut file in files {
+		file = os.getwd() + os.path_separator + test_path + os.path_separator + *file
 	}
+
+// zip files
+	szip.zip_files(files, test_out_zip) or { panic(err) }
+	assert os.exists(test_out_zip)
+
+// remove files before next test
+	os.rm(test_path + os.path_separator + 'file_1.txt') or { panic(err) }
+	os.rm(test_path + os.path_separator + 'file_2.txt') or { panic(err) }
+
+// extract test
+	szip.extract_zip_to_dir(test_out_zip, test_path) or { panic(err) }
+	assert os.exists(test_path + os.path_separator + 'file_1.txt')
+	assert os.exists(test_path + os.path_separator + 'file_2.txt')
+
+// clear temp files
+	// remove temp files and dir
+	os.rmdir_all (test_path) or { panic(err) }
+	os.rm(test_out_zip) or { }
 }