Update XZ Utils to 5.0.4 (third_party)

src/xz/coder.c

 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       coder.c
 /// \brief      Compresses or uncompresses a file
 //
 //  Author:     Lasse Collin
 //
 //  This file has been put into the public domain.
 //  You can do whatever you want with this file.
 //
@@ skipping 266 matching lines @@
         }
 
         return;
 }
 
 
 /// Return true if the data in in_buf seems to be in the .xz format.
 static bool
 is_format_xz(void)
 {
-        return strm.avail_in >= 6 && memcmp(in_buf.u8, "\3757zXZ", 6) == 0;
+        // Specify the magic as hex to be compatible with EBCDIC systems.
+        static const uint8_t magic[6] = { 0xFD, 0x37, 0x7A, 0x58, 0x5A, 0x00 };
+        return strm.avail_in >= sizeof(magic)
+                        && memcmp(in_buf.u8, magic, sizeof(magic)) == 0;
 }
 
 
 /// Return true if the data in in_buf seems to be in the .lzma format.
 static bool
 is_format_lzma(void)
 {
         // The .lzma header is 13 bytes.
         if (strm.avail_in < 13)
                 return false;
@@ skipping 356 matching lines @@
                         }
                 }
         }
 
         // Close the file pair. It needs to know if coding was successful to
         // know if the source or target file should be unlinked.
         io_close(pair, success);
 
         return;
 }