From ddd65517af83dae651d7df90d5bd6b685a77feae Mon Sep 17 00:00:00 2001
From: Alexander Medvednikov <alexander@medvednikov.com>
Date: Thu, 26 Feb 2026 19:40:03 +0300
Subject: [PATCH] archive: add tar library (fixes #1180)

---
 vlib/archive/tar/reader_test.v | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/vlib/archive/tar/reader_test.v b/vlib/archive/tar/reader_test.v
index 3aa66f108..f0c094514 100644
--- a/vlib/archive/tar/reader_test.v
+++ b/vlib/archive/tar/reader_test.v
@@ -1,3 +1,4 @@
+@[has_globals]
 module tar
 
 import os
@@ -8,6 +9,15 @@ fn testsuite_begin() {
 
 const testdata = 'vlib/archive/tar/testdata'
 
+__global (
+	test_chunk_blocks [][]u8
+)
+
+fn collect_test_block(block []u8) !ReadResult {
+	test_chunk_blocks << block.clone()
+	return .continue
+}
+
 // files copied from golang: https://github.com/golang/go/blob/master/src/archive/tar/testdata/file-and-dir.tar	
 fn test_golang_testdata() {
 	// [ ] dir       | 0 bytes | folder
@@ -188,3 +198,22 @@ fn (mut t TestReader) other_block(mut read Read, details string) {
 		println('OTHER #${read.get_block_number()} special:${read.special} ${details}')
 	}
 }
+
+fn test_chunks_reader_moves_pending_bytes_in_order() {
+	mut all := []u8{len: 1024}
+	for i := 0; i < all.len; i++ {
+		all[i] = u8(i % 251)
+	}
+
+	test_chunk_blocks = [][]u8{}
+	mut chunk_reader := ChunksReader{
+		read_block_fn: collect_test_block
+	}
+	assert chunk_reader.read_blocks(all[0..700]) == .continue
+	assert chunk_reader.pending == 188
+	assert chunk_reader.read_blocks(all[700..]) == .continue
+	assert chunk_reader.pending == 0
+	assert test_chunk_blocks.len == 2
+	assert test_chunk_blocks[0] == all[0..512]
+	assert test_chunk_blocks[1] == all[512..]
+}
-- 
2.39.5