From 7fdfa1ffac0461bad40051ab682e02ae32ed1ce6 Mon Sep 17 00:00:00 2001
From: rbuj <robert.buj@gmail.com>
Date: Sat, 18 Jan 2020 16:07:38 +0100
Subject: autoconf: get zstd mime type using libmagic if enabled

---
 configure.ac | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index 22146e0..cdd7081 100644
--- a/configure.ac
+++ b/configure.ac
@@ -141,6 +141,7 @@ AC_ARG_ENABLE([magic],
               AS_HELP_STRING([--enable-magic], [use libmagic to detect file type]),,
               [enable_magic=no])
 
+zstd_mime_type="application/zstd"
 if test x"$enable_magic" = x"yes" ; then
 	save_LIBS="$LIBS"
 	LIBS="$LIBS -lmagic"
@@ -152,6 +153,48 @@ int main () { magic_t m = magic_open(MAGIC_NONE); }
 		       [AC_MSG_RESULT([yes])],
 		       [AC_MSG_RESULT([no])
 		        AC_MSG_ERROR([libmagic is needed for magic])])
+
+	dnl *******************************************
+	dnl This check can be removed with file >= 5.38
+	dnl *******************************************
+	AC_MSG_CHECKING([for zstd mime type])
+	AC_RUN_IFELSE([AC_LANG_PROGRAM([[#include <stdio.h>
+#include <string.h>
+#include <magic.h>]],
+		[[
+    FILE *fptr;
+    char *test_file = "test.zst";
+    char *default_mime_type = "application/zstd";
+    int status = 0;
+    if ((fptr = fopen (test_file,"wb")) == NULL) {
+        status = 1;
+    } else {
+	const unsigned char data[5] = "\x28\xb5\x2f\xfd\0";
+        int i;
+	for (i = 0; i < strlen (data); i++)
+            fwrite (&data[i], 1, 1, fptr);
+        fclose (fptr);
+        magic_t magic_cookie = magic_open (MAGIC_MIME_TYPE);
+        if (magic_cookie == NULL) {
+            status = 1;
+        } else {
+            if (magic_load (magic_cookie, NULL) != 0) {
+                status = 1;
+            } else {
+                const char *mime = magic_file (magic_cookie, test_file);
+                status = (strcmp (default_mime_type, mime) == 0);
+            }
+            magic_close(magic_cookie);
+        }
+	remove (test_file);
+    }
+    return status;]])],
+		[zstd_mime_type="application/x-zstd"],
+		[zstd_mime_type="application/zstd"]
+	)
+	AC_MSG_RESULT($zstd_mime_type)
+	dnl *******************************************
+
 	LIBS="$save_LIBS"
 
 	MAGIC_CFLAGS=
@@ -164,6 +207,9 @@ int main () { magic_t m = magic_open(MAGIC_NONE); }
 fi
 
 AM_CONDITIONAL(ENABLE_MAGIC, test x"$enable_magic" != x"no")
+ZSTD_MIME_TYPE="$zstd_mime_type"
+AC_SUBST(ZSTD_MIME_TYPE)
+AC_DEFINE_UNQUOTED(ZSTD_MIME_TYPE, "$zstd_mime_type", [define zstd mime type])
 
 AC_ARG_VAR([CPIO], [Path to the `cpio` command])
 AC_PATH_PROGS(CPIO, gcpio cpio, cpio)
-- 
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