Copyrights and hexadecmal.

[minimal.git] / mapping.h

diff --git a/mapping.h b/mapping.h
index 6882d0312b28c4a850fb0c4a1153e5c30ba188c4..3b930132c755e61f49e3abd64773a160b6ae153e 100644 (file)
--- a/mapping.h
+++ b/mapping.h
@@ -1,3 +1,43 @@
+/* Minimal - the simplest thing that could possibly work
+ * Copyright (C) 2007  Jay Freeman (saurik)
+*/
+
+/*
+ *        Redistribution and use in source and binary
+ * forms, with or without modification, are permitted
+ * provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the
+ *    above copyright notice, this list of conditions
+ *    and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the
+ *    above copyright notice, this list of conditions
+ *    and the following disclaimer in the documentation
+ *    and/or other materials provided with the
+ *    distribution.
+ * 3. The name of the author may not be used to endorse
+ *    or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+ * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#ifndef MINIMAL_MAPPING_H
+#define MINIMAL_MAPPING_H
+
 #include <sys/mman.h>
 
 #include <errno.h>
@@ -7,19 +47,24 @@
 #include <sys/stat.h>
 #include <fcntl.h>
 
-void *Map(const char *path, size_t *size, bool ro) {
+void *map(const char *path, size_t offset, size_t size, size_t *psize, bool ro) {
     int fd;
     _syscall(fd = open(path, ro ? O_RDONLY : O_RDWR));
 
-    struct stat stat;
-    _syscall(fstat(fd, &stat));
+    if (size == _not(size_t)) {
+        struct stat stat;
+        _syscall(fstat(fd, &stat));
+        size = stat.st_size;
+    }
 
-    if (size != NULL)
-        *size = stat.st_size;
+    if (psize != NULL)
+        *psize = size;
 
     void *base;
-    _syscall(base = mmap(0, stat.st_size, ro ? PROT_READ : PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0));
+    _syscall(base = mmap(NULL, size, ro ? PROT_READ : PROT_READ | PROT_WRITE, MAP_SHARED, fd, offset));
 
     _syscall(close(fd));
     return base;
 }
+
+#endif/*MINIMAL_MAPPING_H*/