1 files changed, 98 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/com32/lib/sys/fileread.c b/contrib/syslinux-4.02/com32/lib/sys/fileread.c
new file mode 100644
index 0000000..aab99c8
--- /dev/null
+++ b/contrib/syslinux-4.02/com32/lib/sys/fileread.c
@@ -0,0 +1,98 @@
+/* ----------------------------------------------------------------------- *
+ *
+ *   Copyright 2004-2008 H. Peter Anvin - All Rights Reserved
+ *
+ *   Permission is hereby granted, free of charge, to any person
+ *   obtaining a copy of this software and associated documentation
+ *   files (the "Software"), to deal in the Software without
+ *   restriction, including without limitation the rights to use,
+ *   copy, modify, merge, publish, distribute, sublicense, and/or
+ *   sell copies of the Software, and to permit persons to whom
+ *   the Software is furnished to do so, subject to the following
+ *   conditions:
+ *
+ *   The above copyright notice and this permission notice shall
+ *   be included in all copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ *   OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ *   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ *   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ *   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ *   OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * read.c
+ *
+ * Reading from a file
+ */
+
+#include <errno.h>
+#include <string.h>
+#include <com32.h>
+#include <syslinux/pmapi.h>
+#include <minmax.h>
+#include "file.h"
+
+int __file_get_block(struct file_info *fp)
+{
+    ssize_t bytes_read;
+
+    bytes_read = __com32.cs_pm->read_file(&fp->i.fd.handle, fp->i.buf,
+					  MAXBLOCK >> fp->i.fd.blocklg2);
+    if (!bytes_read) {
+	errno = EIO;
+	return -1;
+    }
+    
+    fp->i.nbytes = bytes_read;
+    fp->i.datap  = fp->i.buf;
+    return 0;
+}
+
+ssize_t __file_read(struct file_info * fp, void *buf, size_t count)
+{
+    char *bufp = buf;
+    ssize_t n = 0;
+    size_t ncopy;
+
+    while (count) {
+	if (fp->i.nbytes == 0) {
+	    if (fp->i.offset >= fp->i.fd.size || !fp->i.fd.handle)
+		return n;	/* As good as it gets... */
+
+	    if (count > MAXBLOCK) {
+		/* Large transfer: copy directly, without buffering */
+		ncopy = __com32.cs_pm->read_file(&fp->i.fd.handle, bufp,
+						 count >> fp->i.fd.blocklg2);
+		if (!ncopy) {
+		    errno = EIO;
+		    return n ? n : -1;
+		}
+
+		goto got_data;
+	    } else {
+		if (__file_get_block(fp))
+		    return n ? n : -1;
+	    }
+	}
+
+	ncopy = min(count, fp->i.nbytes);
+	memcpy(bufp, fp->i.datap, ncopy);
+
+	fp->i.datap += ncopy;
+	fp->i.offset += ncopy;
+	fp->i.nbytes -= ncopy;
+
+    got_data:
+	n += ncopy;
+	bufp += ncopy;
+	count -= ncopy;
+    }
+
+    return n;
+}