diff --git a/src/odttemplate.c b/src/odttemplate.c
new file mode 100644
index 0000000..db0d0c4
--- /dev/null
+++ b/src/odttemplate.c
@@ -0,0 +1,107 @@
+/*
+ * odttemplate.c
+ * Copyright © 2016 David A. Baer
+ * All rights reserved.
+ * 
+ * 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. Neither the name of the organization nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY David A. Baer ''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 David A. Baer 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.
+ * 
+ */
+
+#include <archive.h>
+#include <archive_entry.h>
+#include "odttemplate.h"
+
+#define ODTTEMPLATE_BLOCK_SIZE 8192
+
+int odttemplate(const char* template_fn, const char* output_fn, struct dict* substitutions_dict) {
+
+    struct archive* arch_in = archive_read_new();
+    struct archive_entry* ent;
+    struct dict_iter* i;
+    char ftype;
+    const char* fn;
+    if (archive_read_support_format_zip(arch_in) != ARCHIVE_OK) {
+        return ODTTEMPLATE_FATAL;
+    }
+    if (archive_read_open_filename(arch_in, template_fn, ODTTEMPLATE_BLOCK_SIZE) != ARCHIVE_OK) {
+        return ODTTEMPLATE_FATAL;
+    }
+    while (archive_read_next_header(arch_in, &ent) != ARCHIVE_EOF) {
+        switch (archive_entry_filetype(ent)) {
+            case AE_IFREG:
+                ftype = 'F';
+                break;
+            case AE_IFLNK:
+                ftype = 'L';
+                break;
+            case AE_IFSOCK:
+                ftype = 'S';
+                break;
+            case AE_IFCHR:
+                ftype = 'C';
+                break;
+            case AE_IFBLK:
+                ftype = 'B';
+                break;
+            case AE_IFDIR:
+                ftype = 'D';
+                break;
+            case AE_IFIFO:
+                ftype = 'P';
+                break;
+            default:
+                ftype = '?';
+        }
+        fn = archive_entry_pathname(ent);
+        printf("%s [%c]", fn, ftype);
+        if (substitutions_dict && (dict_find(substitutions_dict, fn, NULL) == DICT_OK)) {
+            printf(" - in dictionary, skip");
+        }
+        printf("\n");
+        archive_read_data_skip(arch_in);
+    }
+    archive_read_close(arch_in);
+    archive_read_free(arch_in);
+    i = dict_iter_begin(substitutions_dict);
+    while (!dict_iter_done(i)) {
+        printf("Substitute %s: \"%s\"\n", dict_iter_key(i), (char*)dict_iter_value(i));
+        dict_iter_next(i);
+    }
+
+    return ODTTEMPLATE_OK;
+}
+
+#ifdef ODTTEMPLATE_DEBUG
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(int argc, char* argv[]) {
+    struct dict* d = dict_init();
+    if (argc < 2) {
+        printf("Specify ZIP file.\n");
+        exit(1);
+    }
+    dict_add(d, "content.xml", "<foo>bar</foo>");
+    odttemplate(argv[1], NULL, d);
+}
+#endif
diff --git a/src/odttemplate.h b/src/odttemplate.h
new file mode 100644
index 0000000..95c2870
--- /dev/null
+++ b/src/odttemplate.h
@@ -0,0 +1,44 @@
+/*
+ * odttemplate.h
+ * Copyright © 2016 David A. Baer
+ * All rights reserved.
+ * 
+ * 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. Neither the name of the organization nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY David A. Baer ''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 David A. Baer 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 _ODTTEMPLATE_H
+#define _ODTTEMPLATE_H
+
+#include "dict.h"
+
+#define ODTTEMPLATE_OK       0
+#define ODTTEMPLATE_FATAL    1
+
+int odttemplate(
+        const char* template_fn,
+        const char* output_fn,
+        struct dict* substitutions_dict
+);
+
+#endif /* !def(_ODTTEMPLATE_H) */