Tests: Document input of the xz_utils_good_1_block_header_1 test case

1 files changed, 45 insertions, 5 deletions

diff --git a/Tests/LibCompress/TestXz.cpp b/Tests/LibCompress/TestXz.cpp
index b5f092a1fa..e4bd84d24f 100644
--- a/Tests/LibCompress/TestXz.cpp
+++ b/Tests/LibCompress/TestXz.cpp
@@ -1283,11 +1283,51 @@ TEST_CASE(xz_utils_good_1_block_header_1)
     //  Size in the Block Header. This has also four extra bytes of Header
     //  Padding."
     Array<u8, 72> const compressed {
-        0xFD, 0x37, 0x7A, 0x58, 0x5A, 0x00, 0x00, 0x01, 0x69, 0x22, 0xDE, 0x36, 0x03, 0xC0, 0x11, 0x0D,
-        0x21, 0x01, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7F, 0xDE, 0x39, 0xEB, 0x01, 0x00, 0x0C, 0x48,
-        0x65, 0x6C, 0x6C, 0x6F, 0x0A, 0x57, 0x6F, 0x72, 0x6C, 0x64, 0x21, 0x0A, 0x00, 0x00, 0x00, 0x00,
-        0x43, 0xA3, 0xA2, 0x15, 0x00, 0x01, 0x25, 0x0D, 0x71, 0x19, 0xC4, 0xB6, 0x90, 0x42, 0x99, 0x0D,
-        0x01, 0x00, 0x00, 0x00, 0x00, 0x01, 0x59, 0x5A
+        // Stream Header
+        0xFD, 0x37, 0x7A, 0x58, 0x5A, 0x00, // Magic
+        0x00, 0x01,                         // Stream Flags
+        0x69, 0x22, 0xDE, 0x36,             // CRC32
+
+        // Block Header
+        0x03, // Block Header Size
+        0xC0, // Block Flags (one filter, compressed size and uncompressed size present)
+        0x11, // Compressed Size
+        0x0D, // Uncompressed Size
+        // Filter 0 Flags
+        0x21,                         // Filter ID
+        0x01,                         // Size of Properties
+        0x08,                         // Filter Properties
+        0x00, 0x00, 0x00, 0x00, 0x00, // Header Padding
+        0x7F, 0xDE, 0x39, 0xEB,       // CRC32
+
+        // Compressed Data (LZMA2)
+        //   Uncompressed chunk with dictionary reset
+        0x01,       // Control Byte
+        0x00, 0x0C, // 16-bit data size minus one (big-endian)
+        0x48, 0x65, 0x6C, 0x6C, 0x6F, 0x0A, 0x57, 0x6F, 0x72, 0x6C, 0x64, 0x21, 0x0A,
+        //   End of LZMA2 stream
+        0x00,
+
+        // Block Padding
+        0x00, 0x00, 0x00,
+
+        // Uncompressed Data Check (CRC32)
+        0x43, 0xA3, 0xA2, 0x15,
+
+        // Index
+        0x00, // Index Indicator
+        0x01, // Number of Records (multibyte integer)
+        //   Record 0
+        0x25, // Unpadded Size (multibyte integer)
+        0x0D, // Uncompressed Size (multibyte integer)
+        //   CRC32
+        0x71, 0x19, 0xC4, 0xB6,
+
+        // Stream Footer
+        0x90, 0x42, 0x99, 0x0D, // CRC32
+        0x01, 0x00, 0x00, 0x00, // Backward Size
+        0x00, 0x01,             // Stream Flags
+        0x59, 0x5A,             // Footer Magic Bytes
     };
 
     auto stream = MUST(try_make<FixedMemoryStream>(compressed));