From 6dbac5918bcc0a1aff3f39bcf974e8e4ae916e75 Mon Sep 17 00:00:00 2001
From: Jef Roosens <roosensjef@gmail.com>
Date: Wed, 12 Jan 2022 23:06:03 +0100
Subject: [PATCH] Start of .PKGINFO function

---
 src/archive.v | 37 +++++++++++++++++++++++++++++++++++++
 src/main.v    |  4 +++-
 2 files changed, 40 insertions(+), 1 deletion(-)

diff --git a/src/archive.v b/src/archive.v
index 2e33f89..6846ddb 100644
--- a/src/archive.v
+++ b/src/archive.v
@@ -8,6 +8,7 @@ struct C.archive {}
 
 struct C.archive_entry {}
 
+// Create a new archive struct
 fn C.archive_read_new() &C.archive
 fn C.archive_read_support_filter_all(&C.archive)
 fn C.archive_read_support_format_all(&C.archive)
@@ -16,6 +17,8 @@ fn C.archive_read_next_header(&C.archive, &&C.archive_entry) int
 fn C.archive_entry_pathname(&C.archive_entry) &char
 fn C.archive_read_data_skip(&C.archive)
 fn C.archive_read_free(&C.archive) int
+fn C.archive_read_data(&C.archive, voidptr, int)
+fn C.archive_entry_size(&C.archive_entry) int
 
 pub fn list_filenames() {
 	a := C.archive_read_new()
@@ -34,3 +37,37 @@ pub fn list_filenames() {
 
 	r = C.archive_read_free(a)  // Note 3
 }
+
+pub fn get_pkg_info(pkg_path string) ?string {
+	a := C.archive_read_new()
+	entry := &C.archive_entry{}
+	mut r := 0
+
+	C.archive_read_support_filter_all(a)
+	C.archive_read_support_format_all(a)
+
+	// TODO find out where does this 10240 come from
+	r = C.archive_read_open_filename(a, &char(pkg_path.str), 10240)
+
+	if r != C.ARCHIVE_OK {
+		return error('Failed to open package.')
+	}
+
+	// We iterate over every header in search of the .PKGINFO one
+	mut pkg_info := ''
+	for C.archive_read_next_header(a, &entry) == C.ARCHIVE_OK {
+		// TODO possibly avoid this cstring_to_vstring
+		if cstring_to_vstring(C.archive_entry_pathname(entry)) == '.PKGINFO' {
+			size := C.archive_entry_size(entry)
+
+			mut buf := []byte{len: size}
+			C.archive_read_data(a, voidptr(&buf), size)
+			break
+		}else{
+			C.archive_read_data_skip(a)
+		}
+	}
+
+	r = C.archive_read_free(a)  // Note 3
+	return ''
+}
diff --git a/src/main.v b/src/main.v
index 54b3662..dbf4652 100644
--- a/src/main.v
+++ b/src/main.v
@@ -95,7 +95,9 @@ fn main() {
 		logger.info("Created package directory '$repo.pkg_dir()'.")
 	}
 
-	archive.list_filenames()
+	archive.get_pkg_info('test/homebank-5.5.1-1-x86_64.pkg.tar.zst') or {
+		eprintln(err.msg)
+	}
 	web.run(&App{
 		logger: logger
 		api_key: key