diff --git a/data.c b/data.c
new file mode 100644
index 0000000..aef8c36
--- /dev/null
+++ b/data.c
@@ -0,0 +1,250 @@
+/*
+ * (C) Copyright David Gibson <dwg@au1.ibm.com>, IBM Corporation.  2005.
+ *
+ * 
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  General Public License for more details.
+ *                                                                       
+ *  You should have received a copy of the GNU General Public License    
+ *  along with this program; if not, write to the Free Software          
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 
+ *                                                                   USA 
+ */
+
+#include "dtc.h"
+
+#if 0
+static struct data data_init_buf(char *buf, int len)
+{
+	struct data d;
+
+	d.asize = 0;
+	d.len = len;
+	d.val = buf;
+
+	return d;
+}
+
+struct data data_ref_string(char *str)
+{
+	return data_init_buf(str, strlen(str)+1);
+}
+#endif
+
+void data_free(struct data d)
+{
+	assert(!d.val || d.asize);
+
+	if (d.val)
+		free(d.val);
+}
+
+struct data data_grow_for(struct data d, int xlen)
+{
+	struct data nd;
+	int newsize;
+
+	/* we must start with an allocated datum */
+	assert(!d.val || d.asize);
+
+	if (xlen == 0)
+		return d;
+
+	newsize = xlen;
+
+	while ((d.len + xlen) > newsize)
+		newsize *= 2;
+
+	nd.asize = newsize;
+	nd.val = xrealloc(d.val, newsize);
+	nd.len = d.len;
+
+	assert(nd.asize >= (d.len + xlen));
+
+	return nd;
+}
+
+struct data data_copy_mem(char *mem, int len)
+{
+	struct data d;
+
+	d = data_grow_for(empty_data, len);
+
+	d.len = len;
+	memcpy(d.val, mem, len);
+
+	return d;
+}
+
+char hexval(char c)
+{
+	switch (c) {
+	case '0' ... '9':
+		return c - '0';
+	case 'a' ... 'f':
+		return c - 'a';
+	case 'A' ... 'F':
+		return c - 'A';
+	default:
+		assert(0);
+	}
+}
+
+char get_oct_char(char *s, int *i)
+{
+	char x[4];
+	char *endx;
+	long val;
+
+	x[3] = '\0';
+	x[0] = s[(*i)];
+	if (x[0]) {
+		x[1] = s[(*i)+1];
+		if (x[1])
+			x[2] = s[(*i)+2];
+	}
+
+	val = strtol(x, &endx, 8);
+	if ((endx - x) == 0)
+		fprintf(stderr, "Empty \\nnn escape\n");
+		
+	(*i) += endx - x;
+	return val;
+}
+
+char get_hex_char(char *s, int *i)
+{
+	char x[3];
+	char *endx;
+	long val;
+
+	x[2] = '\0';
+	x[0] = s[(*i)];
+	if (x[0])
+		x[1] = s[(*i)+1];
+
+	val = strtol(x, &endx, 16);
+	if ((endx - x) == 0)
+		fprintf(stderr, "Empty \\x escape\n");
+		
+	(*i) += endx - x;
+	return val;
+}
+
+struct data data_copy_escape_string(char *s, int len)
+{
+	int i = 0;
+	struct data d;
+	char *q;
+
+	d = data_grow_for(empty_data, strlen(s)+1);
+
+	q = d.val;
+	while (i < len) {
+		char c = s[i++];
+
+		if (c != '\\') {
+			q[d.len++] = c;
+			continue;
+		}
+
+		c = s[i++];
+		assert(c);
+		switch (c) {
+		case 't':
+			q[d.len++] = '\t';
+			break;
+		case 'n':
+			q[d.len++] = '\n';
+			break;
+		case 'r':
+			q[d.len++] = '\r';
+			break;
+		case '0' ... '7':
+			i--; /* need to re-read the first digit as
+			      * part of the octal value */
+			q[d.len++] = get_oct_char(s, &i);
+			break;
+		case 'x':
+			q[d.len++] = get_hex_char(s, &i);
+			break;
+		default:
+			q[d.len++] = c;
+		}
+	}
+
+	q[d.len++] = '\0';
+	return d;
+}
+
+struct data data_copy_file(FILE *f, size_t len)
+{
+	struct data d;
+
+	d = data_grow_for(empty_data, len);
+
+	d.len = len;
+	fread(d.val, len, 1, f);
+
+	return d;
+}
+
+struct data data_append_data(struct data d, void *p, int len)
+{
+	d = data_grow_for(d, len);
+	memcpy(d.val + d.len, p, len);
+	d.len += len;
+	return d;
+}
+
+struct data data_append_cell(struct data d, cell_t word)
+{
+	cell_t beword = cpu_to_be32(word);
+
+	return data_append_data(d, &beword, sizeof(beword));
+}
+
+struct data data_append_byte(struct data d, uint8_t byte)
+{
+	return data_append_data(d, &byte, 1);
+}
+
+struct data data_append_zeroes(struct data d, int len)
+{
+	d = data_grow_for(d, len);
+
+	memset(d.val + d.len, 0, len);
+	d.len += len;
+	return d;
+}
+
+struct data data_append_align(struct data d, int align)
+{
+	int newlen = ALIGN(d.len, align);
+	return data_append_zeroes(d, newlen - d.len);
+}
+
+int data_is_one_string(struct data d)
+{
+	int i;
+	int len = d.len;
+
+	if (len == 0)
+		return 0;
+
+	for (i = 0; i < len-1; i++)
+		if (d.val[i] == '\0')
+			return 0;
+
+	if (d.val[len-1] != '\0')
+		return 0;
+
+	return 1;
+}