1 files changed, 161 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/com32/lib/syslinux/initramfs_file.c b/contrib/syslinux-4.02/com32/lib/syslinux/initramfs_file.c
new file mode 100644
index 0000000..763eff2
--- /dev/null
+++ b/contrib/syslinux-4.02/com32/lib/syslinux/initramfs_file.c
@@ -0,0 +1,161 @@
+/* ----------------------------------------------------------------------- *
+ *
+ *   Copyright 2007-2008 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.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * initramfs_file.c
+ *
+ * Utility functions to add arbitrary files including cpio header
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <syslinux/linux.h>
+
+#define CPIO_MAGIC "070701"
+struct cpio_header {
+    char c_magic[6];		/* 070701 */
+    char c_ino[8];		/* Inode number */
+    char c_mode[8];		/* File mode and permissions */
+    char c_uid[8];		/* uid */
+    char c_gid[8];		/* gid */
+    char c_nlink[8];		/* Number of links */
+    char c_mtime[8];		/* Modification time */
+    char c_filesize[8];		/* Size of data field */
+    char c_maj[8];		/* File device major number */
+    char c_min[8];		/* File device minor number */
+    char c_rmaj[8];		/* Device node reference major number */
+    char c_rmin[8];		/* Device node reference minor number */
+    char c_namesize[8];		/* Length of filename including final \0 */
+    char c_chksum[8];		/* Checksum if c_magic ends in 2 */
+};
+
+static uint32_t next_ino = 1;
+
+/* Create cpio headers for the directory entries leading up to a file.
+   Returns the number of bytes; doesn't touch the buffer if too small. */
+static size_t initramfs_mkdirs(const char *filename, void *buffer,
+			       size_t buflen)
+{
+    const char *p = filename;
+    char *bp = buffer;
+    int len;
+    size_t bytes = 0;
+    int pad;
+
+    while ((p = strchr(p, '/'))) {
+	if (p != filename && p[-1] != '/') {
+	    len = p - filename;
+	    bytes += ((sizeof(struct cpio_header) + len + 1) + 3) & ~3;
+	}
+	p++;
+    }
+
+    if (buflen >= bytes) {
+	p = filename;
+	while ((p = strchr(p, '/'))) {
+	    if (p != filename && p[-1] != '/') {
+		len = p - filename;
+		bp += sprintf(bp, "070701%08x%08x%08x%08x%08x%08x%08x%08x%08x"
+			      "%08x%08x%08x%08x", next_ino++, S_IFDIR | 0755,
+			      0, 0, 1, 0, 0, 0, 1, 0, 1, len + 1, 0);
+		memcpy(bp, filename, len);
+		bp += len;
+		pad = (-(sizeof(struct cpio_header) + len) & 3) + 1;
+		memset(bp, 0, pad);
+		bp += pad;
+	    }
+	}
+    }
+
+    return bytes;
+}
+
+/*
+ * Create a file header (with optional parent directory entries)
+ * and add it to an initramfs chain
+ */
+int initramfs_mknod(struct initramfs *ihead, const char *filename,
+		    int do_mkdir,
+		    uint16_t mode, size_t len, uint32_t major, uint32_t minor)
+{
+    size_t bytes;
+    int namelen = strlen(filename);
+    int pad;
+    char *buffer, *bp;
+
+    if (do_mkdir)
+	bytes = initramfs_mkdirs(filename, NULL, 0);
+    else
+	bytes = 0;
+
+    bytes += ((sizeof(struct cpio_header) + namelen + 1) + 3) & ~3;
+
+    bp = buffer = malloc(bytes);
+    if (!buffer)
+	return -1;
+
+    if (do_mkdir)
+	bp += initramfs_mkdirs(filename, bp, bytes);
+
+    bp += sprintf(bp, "070701%08x%08x%08x%08x%08x%08x%08x%08x%08x"
+		  "%08x%08x%08x%08x", next_ino++, mode,
+		  0, 0, 1, 0, len, 0, 1, major, minor, namelen + 1, 0);
+    memcpy(bp, filename, namelen);
+    bp += len;
+    pad = (-(sizeof(struct cpio_header) + namelen) & 3) + 1;
+    memset(bp, 0, pad);
+
+    if (initramfs_add_data(ihead, buffer, bytes, bytes, 4)) {
+	free(buffer);
+	return -1;
+    }
+
+    return 0;
+}
+
+/*
+ * Add a file given data in memory to an initramfs chain.  This
+ * can be used to create nonfiles like symlinks by specifying an
+ * appropriate mode.
+ */
+int initramfs_add_file(struct initramfs *ihead, const void *data,
+		       size_t data_len, size_t len,
+		       const char *filename, int do_mkdir, uint32_t mode)
+{
+    if (initramfs_mknod(ihead, filename, do_mkdir,
+			(mode & S_IFMT) ? mode : mode | S_IFREG, len, 0, 1))
+	return -1;
+
+    return initramfs_add_data(ihead, data, data_len, len, 4);
+}
+
+int initramfs_add_trailer(struct initramfs *ihead)
+{
+    return initramfs_mknod(ihead, "TRAILER!!!", 0, 0, 0, 0, 0);
+}