Security-57031.1.35.tar.gz

[apple/security.git] / Security / libsecurity_cdsa_utils / lib / cuFileIo.c

diff --git a/Security/libsecurity_cdsa_utils/lib/cuFileIo.c b/Security/libsecurity_cdsa_utils/lib/cuFileIo.c
new file mode 100644 (file)
index 0000000..bb1403e
--- /dev/null
+++ b/Security/libsecurity_cdsa_utils/lib/cuFileIo.c
@@ -0,0 +1,113 @@
+/*
+ * Copyright (c) 2001-2003,2011-2012,2014 Apple Inc. All Rights Reserved.
+ * 
+ * The contents of this file constitute Original Code as defined in and are
+ * subject to the Apple Public Source License Version 1.2 (the 'License').
+ * You may not use this file except in compliance with the License. Please 
+ * obtain a copy of the License at http://www.apple.com/publicsource and 
+ * read it before using this file.
+ * 
+ * This Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 
+ * Please see the License for the specific language governing rights and 
+ * limitations under the License.
+ */
+ 
+/*
+       File:            cuFileIo.c 
+       
+       Description: simple file read/write utilities
+*/
+
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include "cuFileIo.h"
+
+int writeFile(
+       const char                      *fileName,
+       const unsigned char     *bytes,
+       unsigned                        numBytes)
+{
+       int             rtn;
+       int     fd;
+       
+       fd = open(fileName, O_RDWR | O_CREAT | O_TRUNC, 0600);
+       if(fd < 0) {
+               return errno;
+       }
+       rtn = (int)lseek(fd, 0, SEEK_SET);
+       if(rtn < 0) {
+               return errno;
+       }
+       rtn = (int)write(fd, bytes, (size_t)numBytes);
+       if(rtn != (int)numBytes) {
+               if(rtn >= 0) {
+                       printf("writeFile: short write\n");
+               }
+               rtn = EIO;
+       }
+       else {
+               rtn = 0;
+       }
+       close(fd);
+       return rtn;
+}
+       
+/*
+ * Read entire file. 
+ */
+int readFile(
+       const char              *fileName,
+       unsigned char   **bytes,                // mallocd and returned
+       unsigned                *numBytes)              // returned
+{
+       int rtn;
+       int fd;
+       unsigned char *buf;
+       struct stat     sb;
+       unsigned size;
+       
+       *numBytes = 0;
+       *bytes = NULL;
+       fd = open(fileName, O_RDONLY, 0);
+       if(fd < 0) {
+               return errno;
+       }
+       rtn = fstat(fd, &sb);
+       if(rtn) {
+               goto errOut;
+       }
+       size = (unsigned)sb.st_size;
+       buf = malloc(size);
+       if(buf == NULL) {
+               rtn = ENOMEM;
+               goto errOut;
+       }
+       rtn = (int)lseek(fd, 0, SEEK_SET);
+       if(rtn < 0) {
+               goto errOut;
+       }
+       rtn = (int)read(fd, buf, (size_t)size);
+       if(rtn != (int)size) {
+               if(rtn >= 0) {
+                       printf("readFile: short read\n");
+               }
+               rtn = EIO;
+       }
+       else {
+               rtn = 0;
+               *bytes = buf;
+               *numBytes = size;
+       }
+errOut:
+       close(fd);
+       return rtn;
+}