libdpkg: Add a test case for fd_md5()

lib/dpkg/test/t-buffer.c

@@ -2,7 +2,7 @@
  * libdpkg - Debian packaging suite library routines
  * t-buffer.c - test buffer handling
  *
- * Copyright © 2009-2010 Guillem Jover <guillem@debian.org>
+ * Copyright © 2009-2011 Guillem Jover <guillem@debian.org>
  *
  * This is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -25,24 +25,56 @@
 #include <dpkg/buffer.h>
 #include <dpkg/dpkg.h>
 
+#include <sys/types.h>
+
+#include <unistd.h>
+#include <stdlib.h>
 #include <stdio.h>
 
+static const char str_empty[] = "";
+static const char ref_hash_empty[] = "d41d8cd98f00b204e9800998ecf8427e";
+static const char str_test[] = "this is a test string\n";
+static const char ref_hash_test[] = "475aae3b885d70a9130eec23ab33f2b9";
+
 static void
 test_buffer_hash(void)
 {
-	const char str_test[] = "this is a test string\n";
-	const char str_empty[] = "";
 	char hash[MD5HASHLEN + 1];
 
 	buffer_md5(str_empty, hash, strlen(str_empty));
-	test_str(hash, ==, "d41d8cd98f00b204e9800998ecf8427e");
+	test_str(hash, ==, ref_hash_empty);
 
 	buffer_md5(str_test, hash, strlen(str_test));
-	test_str(hash, ==, "475aae3b885d70a9130eec23ab33f2b9");
+	test_str(hash, ==, ref_hash_test);
+}
+
+static void
+test_fdio_hash(void)
+{
+	char hash[MD5HASHLEN + 1];
+	char *test_file;
+	int fd;
+
+	test_file = strdup("test.XXXXXX");
+	test_pass(test_file != NULL);
+	fd = mkstemp(test_file);
+	test_pass(fd >= 0);
+
+	fd_md5(fd, hash, -1, "test empty file");
+	test_str(hash, ==, ref_hash_empty);
+
+	test_pass(write(fd, str_test, strlen(str_test)) == strlen(str_test));
+	test_pass(lseek(fd, 0, SEEK_SET) == 0);
+
+	fd_md5(fd, hash, -1, "test filled file");
+	test_str(hash, ==, ref_hash_test);
+
+	test_pass(unlink(test_file) == 0);
 }
 
 static void
 test(void)
 {
 	test_buffer_hash();
+	test_fdio_hash();
 }