Merge CUPS 1.4svn-r7319.

[thirdparty/cups.git] / driver / check.c

diff --git a/driver/check.c b/driver/check.c
new file mode 100644 (file)
index 0000000..d7ceb3d
--- /dev/null
+++ b/driver/check.c
@@ -0,0 +1,111 @@
+/*
+ * "$Id$"
+ *
+ *   Byte checking routines for CUPS.
+ *
+ *   Copyright 2007 by Apple Inc.
+ *   Copyright 1993-2005 by Easy Software Products.
+ *
+ *   These coded instructions, statements, and computer programs are the
+ *   property of Apple Inc. and are protected by Federal copyright
+ *   law.  Distribution and use rights are outlined in the file "LICENSE.txt"
+ *   which should have been included with this file.  If this file is
+ *   file is missing or damaged, see the license at "http://www.cups.org/".
+ *
+ * Contents:
+ *
+ *   cupsCheckBytes() - Check to see if all bytes are zero.
+ *   cupsCheckValue() - Check to see if all bytes match the given value.
+ */
+
+/*
+ * Include necessary headers.
+ */
+
+#include "driver.h"
+
+
+/*
+ * 'cupsCheckBytes()' - Check to see if all bytes are zero.
+ */
+
+int                                            /* O - 1 if they match */
+cupsCheckBytes(const unsigned char *bytes,     /* I - Bytes to check */
+               int                 length)     /* I - Number of bytes to check */
+{
+  while (length > 7)
+  {
+    if (*bytes++)
+      return (0);
+    if (*bytes++)
+      return (0);
+    if (*bytes++)
+      return (0);
+    if (*bytes++)
+      return (0);
+    if (*bytes++)
+      return (0);
+    if (*bytes++)
+      return (0);
+    if (*bytes++)
+      return (0);
+    if (*bytes++)
+      return (0);
+
+    length -= 8;
+  }
+
+  while (length > 0)
+    if (*bytes++)
+      return (0);
+    else
+      length --;
+
+  return (1);
+}
+
+
+/*
+ * 'cupsCheckValue()' - Check to see if all bytes match the given value.
+ */
+
+int                                            /* O - 1 if they match */
+cupsCheckValue(const unsigned char *bytes,     /* I - Bytes to check */
+               int                 length,     /* I - Number of bytes to check */
+              const unsigned char value)       /* I - Value to check */
+{
+  while (length > 7)
+  {
+    if (*bytes++ != value)
+      return (0);
+    if (*bytes++ != value)
+      return (0);
+    if (*bytes++ != value)
+      return (0);
+    if (*bytes++ != value)
+      return (0);
+    if (*bytes++ != value)
+      return (0);
+    if (*bytes++ != value)
+      return (0);
+    if (*bytes++ != value)
+      return (0);
+    if (*bytes++ != value)
+      return (0);
+
+    length -= 8;
+  }
+
+  while (length > 0)
+    if (*bytes++ != value)
+      return (0);
+    else
+      length --;
+
+  return (1);
+}
+
+
+/*
+ * End of "$Id$".
+ */