Make a noble effort at setting OS_CODE correctly.
This updates the OS_CODE determination at compile time to match as
closely as possible the operating system mappings documented in
the PKWare APPNOTE.TXT version 6.3.4, section 4.4.2.2. That byte
in the gzip header is used by nobody for anything, as far as I can
tell. However we might as well try to set it appropriately.
diff --git a/zutil.h b/zutil.h
index 3b761d3..9441a1e 100644
--- a/zutil.h
+++ b/zutil.h
@@ -98,28 +98,38 @@
#endif
#ifdef AMIGA
-# define OS_CODE 0x01
+# define OS_CODE 1
#endif
#if defined(VAXC) || defined(VMS)
-# define OS_CODE 0x02
+# define OS_CODE 2
# define F_OPEN(name, mode) \
fopen((name), (mode), "mbc=60", "ctx=stm", "rfm=fix", "mrs=512")
#endif
+#ifdef __370__
+# if __TARGET_LIB__ < 0x20000000
+# define OS_CODE 4
+# elif __TARGET_LIB__ < 0x40000000
+# define OS_CODE 11
+# else
+# define OS_CODE 8
+# endif
+#endif
+
#if defined(ATARI) || defined(atarist)
-# define OS_CODE 0x05
+# define OS_CODE 5
#endif
#ifdef OS2
-# define OS_CODE 0x06
+# define OS_CODE 6
# if defined(M_I86) && !defined(Z_SOLO)
# include <malloc.h>
# endif
#endif
#if defined(MACOS) || defined(TARGET_OS_MAC)
-# define OS_CODE 0x07
+# define OS_CODE 7
# ifndef Z_SOLO
# if defined(__MWERKS__) && __dest_os != __be_os && __dest_os != __win32_os
# include <unix.h> /* for fdopen */
@@ -131,18 +141,24 @@
# endif
#endif
-#ifdef TOPS20
-# define OS_CODE 0x0a
+#ifdef __acorn
+# define OS_CODE 13
#endif
-#ifdef WIN32
-# ifndef __CYGWIN__ /* Cygwin is Unix, not Win32 */
-# define OS_CODE 0x0b
-# endif
+#if defined(WIN32) && !defined(__CYGWIN__)
+# define OS_CODE 10
#endif
-#ifdef __50SERIES /* Prime/PRIMOS */
-# define OS_CODE 0x0f
+#ifdef _BEOS_
+# define OS_CODE 16
+#endif
+
+#ifdef __TOS_OS400__
+# define OS_CODE 18
+#endif
+
+#ifdef __APPLE__
+# define OS_CODE 19
#endif
#if defined(_BEOS_) || defined(RISCOS)
@@ -177,7 +193,7 @@
/* common defaults */
#ifndef OS_CODE
-# define OS_CODE 0x03 /* assume Unix */
+# define OS_CODE 3 /* assume Unix */
#endif
#ifndef F_OPEN
