Add basic diff view

Finally, xdiff is used to show per-file diffs via commit view.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

7 files changed, 270 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index 58a583b..4aa7afe 100644
--- a/Makefile
+++ b/Makefile
@@ -1,30 +1,30 @@
 CGIT_VERSION = 0.1-pre
 
 INSTALL_BIN = /var/www/htdocs/cgit.cgi
 INSTALL_CSS = /var/www/htdocs/cgit.css
 CACHE_ROOT = /var/cache/cgit
 
 EXTLIBS = ../git/libgit.a ../git/xdiff/lib.a -lz -lcrypto
 OBJECTS = shared.o cache.o parsing.o html.o ui-shared.o ui-repolist.o \
-        ui-summary.o ui-log.o ui-view.c ui-tree.c ui-commit.c
+        ui-summary.o ui-log.o ui-view.c ui-tree.c ui-commit.c ui-diff.o
 
 CFLAGS += -Wall
 
 all: cgit
 
 install: all clean-cache
         install cgit $(INSTALL_BIN)
         install cgit.css $(INSTALL_CSS)
 
 cgit: cgit.c cgit.h git.h $(OBJECTS)
         $(CC) $(CFLAGS) -DCGIT_VERSION='"$(CGIT_VERSION)"' cgit.c -o cgit \
                 $(OBJECTS) $(EXTLIBS)
 
 $(OBJECTS): cgit.h git.h
 
 .PHONY: clean
 clean:
         rm -f cgit *.o
 
 clean-cache:
         rm -rf $(CACHE_ROOT)/*
diff --git a/cgit.c b/cgit.c
index 372b436..ac43441 100644
--- a/cgit.c
+++ b/cgit.c
@@ -1,134 +1,136 @@
 /* cgit.c: cgi for the git scm
  *
  * Copyright (C) 2006 Lars Hjemli
  *
  * Licensed under GNU General Public License v2
  *   (see COPYING for full license text)
  */
 
 #include "cgit.h"
 
 const char cgit_version[] = CGIT_VERSION;
 
 static void cgit_print_repo_page(struct cacheitem *item)
 {
         if (chdir(fmt("%s/%s", cgit_root, cgit_query_repo)) || 
             cgit_read_config("info/cgit", cgit_repo_config_cb)) {
                 char *title = fmt("%s - %s", cgit_root_title, "Bad request");
                 cgit_print_docstart(title, item);
                 cgit_print_pageheader(title);
                 cgit_print_error(fmt("Unable to scan repository: %s",
                                      strerror(errno)));
                 cgit_print_docend();
                 return;
         }
         setenv("GIT_DIR", fmt("%s/%s", cgit_root, cgit_query_repo), 1);
         char *title = fmt("%s - %s", cgit_repo_name, cgit_repo_desc);
         cgit_print_docstart(title, item);
         cgit_print_pageheader(title);
         if (!cgit_query_page) {
                 cgit_print_summary();
         } else if (!strcmp(cgit_query_page, "log")) {
                 cgit_print_log(cgit_query_head, cgit_query_ofs, 100);
         } else if (!strcmp(cgit_query_page, "tree")) {
                 cgit_print_tree(cgit_query_sha1);
         } else if (!strcmp(cgit_query_page, "commit")) {
                 cgit_print_commit(cgit_query_sha1);
         } else if (!strcmp(cgit_query_page, "view")) {
                 cgit_print_view(cgit_query_sha1);
+        } else if (!strcmp(cgit_query_page, "diff")) {
+                cgit_print_diff(cgit_query_sha1, cgit_query_sha2);
         }
         cgit_print_docend();
 }
 
 static void cgit_fill_cache(struct cacheitem *item)
 {
         static char buf[PATH_MAX];
 
         getcwd(buf, sizeof(buf));
         htmlfd = item->fd;
         item->st.st_mtime = time(NULL);
         if (cgit_query_repo)
                 cgit_print_repo_page(item);
         else
                 cgit_print_repolist(item);
         chdir(buf);
 }
 
 static void cgit_check_cache(struct cacheitem *item)
 {
         int i = 0;
 
         cache_prepare(item);
  top:
         if (++i > cgit_max_lock_attempts) {
                 die("cgit_refresh_cache: unable to lock %s: %s",
                     item->name, strerror(errno));
         }
         if (!cache_exist(item)) {
                 if (!cache_lock(item)) {
                         sleep(1);
                         goto top;
                 }
                 if (!cache_exist(item)) {
                         cgit_fill_cache(item);
                         cache_unlock(item);
                 } else {
                         cache_cancel_lock(item);
                 }
         } else if (cache_expired(item) && cache_lock(item)) {
                 if (cache_expired(item)) {
                         cgit_fill_cache(item);
                         cache_unlock(item);
                 } else {
                         cache_cancel_lock(item);
                 }
         }
 }
 
 static void cgit_print_cache(struct cacheitem *item)
 {
         static char buf[4096];
         ssize_t i;
 
         int fd = open(item->name, O_RDONLY);
         if (fd<0)
                 die("Unable to open cached file %s", item->name);
 
         while((i=read(fd, buf, sizeof(buf))) > 0)
                 write(STDOUT_FILENO, buf, i);
 
         close(fd);
 }
 
 static void cgit_parse_args(int argc, const char **argv)
 {
         int i;
 
         for (i = 1; i < argc; i++) {
                 if (!strncmp(argv[i], "--root=", 7)) {
                         cgit_root = xstrdup(argv[i]+7);
                 }
                 if (!strncmp(argv[i], "--cache=", 8)) {
                         cgit_cache_root = xstrdup(argv[i]+8);
                 }
                 if (!strcmp(argv[i], "--nocache")) {
                         cgit_nocache = 1;
                 }
                 if (!strncmp(argv[i], "--query=", 8)) {
                         cgit_querystring = xstrdup(argv[i]+8);
                 }
                 if (!strncmp(argv[i], "--repo=", 7)) {
                         cgit_query_repo = xstrdup(argv[i]+7);
                 }
                 if (!strncmp(argv[i], "--page=", 7)) {
                         cgit_query_page = xstrdup(argv[i]+7);
                 }
                 if (!strncmp(argv[i], "--head=", 7)) {
                         cgit_query_head = xstrdup(argv[i]+7);
                         cgit_query_has_symref = 1;
                 }
                 if (!strncmp(argv[i], "--sha1=", 7)) {
                         cgit_query_sha1 = xstrdup(argv[i]+7);
                         cgit_query_has_sha1 = 1;
                 }
                 if (!strncmp(argv[i], "--ofs=", 6)) {
diff --git a/cgit.css b/cgit.css
index 5f01926..7b8e468 100644
--- a/cgit.css
+++ b/cgit.css
@@ -1,166 +1,191 @@
 body {
         font-family: arial;
         font-size: normal;
         background: white;
         padding: 0em;
         margin: 0.5em 1em;
 }
 
 
 h2 {
         font-size: normal;
         font-weight: bold;
         margin-bottom: 0.1em;
 }
 
 a {
         color: blue;
         text-decoration: none;
 }
 
 a:hover {
         text-decoration: underline;
 }
 
 table.list {
         border: solid 1px black;
         border-collapse: collapse;
         border: solid 1px #aaa;
 }
 table.list tr {
         background: white;
 }
 table.list tr:hover {
         background: #eee;
 }
 table.list th {
         font-weight: bold;
         background: #ddd;
         border-bottom: solid 1px #aaa;
         padding: 0.1em 0.5em 0.1em 0.5em;
         vertical-align: baseline;
 }
 table.list td {
         border: none;
         padding: 0.1em 0.5em 0.1em 0.5em;
 }
 img {
         border: none;
 }
 
 
 div#header {
         background-color: #eee;
         padding: 0.25em 0.25em 0.25em 0.5em;
         font-size: 150%;
         font-weight: bold;
         border: solid 1px #ccc;
         vertical-align: middle;
 }
 div#header img#logo {
         float: right;
 }
 div#header a {
         color: black;
 }
 
 div#content {
         margin: 0.5em 0.5em;
 }
 
 div#blob {
         border: solid 1px black;
 }
 
 div.error {
         color: red;
         font-weight: bold;
         margin: 1em 2em;
 }
+div.ls-blob, div.ls-dir {
+        font-family: monospace;
+}
 div.ls-dir a {
         font-weight: bold;
 }
 th.filesize, td.filesize {
         text-align: right;
 }
+td.filesize {
+        font-family: monospace;
+}
 td.filemode {
         font-family: monospace;
 }
 
 td.blob {
         white-space: pre;
         font-family: courier;
         font-size: 100%;
         background-color: white;
 }
 
 table.log td {
         white-space: nowrap;
 }
 
 table.commit-info {
         border-collapse: collapse;
         margin-top: 1.5em;
 }
 table.commit-info th {
         text-align: left;
         font-weight: normal;
         padding: 0.1em 1em 0.1em 0.1em;
 }
 table.commit-info td {
         font-weight: normal;
         padding: 0.1em 1em 0.1em 0.1em;
 }
 div.commit-subject {
         font-weight: bold;
         font-size: 125%;
         margin: 1.5em 0em 0.5em 0em;
         padding: 0em;
 }
 div.commit-msg {
         white-space: pre;
         font-family: monospace;
 }
 table.diffstat {
         border-collapse: collapse;
         margin-top: 1.5em;
 }
 table.diffstat th {
         font-weight: normal;
         text-align: left;
         text-decoration: underline;
         padding: 0.1em 1em 0.1em 0.1em;
         font-size: 100%;
 }
 table.diffstat td {
         padding: 0.1em 1em 0.1em 0.1em;
         font-size: 100%;
 }
 table.diffstat td span.modechange {
         padding-left: 1em;
         color: red;
 }
 table.diffstat td.add a {
         color: green;
 }
 table.diffstat td.del a {
         color: red;
 }
 table.diffstat td.upd a {
         color: blue;
 }
 table.diffstat td.summary {
         /* border-top: solid 1px black; */
         color: #888;
         padding-top: 0.5em;
 }
+
+table.diff td {
+        border: solid 1px black;
+        font-family: monospace;
+        white-space: pre;
+}
+
+table.diff td div.hunk {
+        background: #ccc;
+}
+
+table.diff td div.add {
+        color: green;
+}
+
+table.diff td div.del {
+        color: red;
+}
+
 .sha1 {
         font-family: courier;
         font-size: 90%;
 }
 .left {
         text-align: left;
 }
 .right {
         text-align: right;
 }
diff --git a/cgit.h b/cgit.h
index 37584d6..bba2d6c 100644
--- a/cgit.h
+++ b/cgit.h
@@ -1,108 +1,110 @@
 #ifndef CGIT_H
 #define CGIT_H
 
 #include "git.h"
 #include <openssl/sha.h>
 #include <ctype.h>
 #include <sched.h>
 
 typedef void (*configfn)(const char *name, const char *value);
 
 struct cacheitem {
         char *name;
         struct stat st;
         int ttl;
         int fd;
 };
 
 struct commitinfo {
         struct commit *commit;
         char *author;
         char *author_email;
         unsigned long author_date;
         char *committer;
         char *committer_email;
         unsigned long committer_date;
         char *subject;
         char *msg;
 };
 
 extern const char cgit_version[];
 
 extern char *cgit_root;
 extern char *cgit_root_title;
 extern char *cgit_css;
 extern char *cgit_logo;
 extern char *cgit_logo_link;
 extern char *cgit_virtual_root;
 extern char *cgit_cache_root;
 
 extern int cgit_nocache;
 extern int cgit_max_lock_attempts;
 extern int cgit_cache_root_ttl;
 extern int cgit_cache_repo_ttl;
 extern int cgit_cache_dynamic_ttl;
 extern int cgit_cache_static_ttl;
 extern int cgit_cache_max_create_time;
 
 extern char *cgit_repo_name;
 extern char *cgit_repo_desc;
 extern char *cgit_repo_owner;
 
 extern int cgit_query_has_symref;
 extern int cgit_query_has_sha1;
 
 extern char *cgit_querystring;
 extern char *cgit_query_repo;
 extern char *cgit_query_page;
 extern char *cgit_query_head;
 extern char *cgit_query_sha1;
+extern char *cgit_query_sha2;
 extern int   cgit_query_ofs;
 
 extern int htmlfd;
 
 extern void cgit_global_config_cb(const char *name, const char *value);
 extern void cgit_repo_config_cb(const char *name, const char *value);
 extern void cgit_querystring_cb(const char *name, const char *value);
 
 extern void *cgit_free_commitinfo(struct commitinfo *info);
 
 extern char *fmt(const char *format,...);
 
 extern void html(const char *txt);
 extern void htmlf(const char *format,...);
 extern void html_txt(char *txt);
 extern void html_attr(char *txt);
 extern void html_link_open(char *url, char *title, char *class);
 extern void html_link_close(void);
 extern void html_filemode(unsigned short mode);
 
 extern int cgit_read_config(const char *filename, configfn fn);
 extern int cgit_parse_query(char *txt, configfn fn);
 extern struct commitinfo *cgit_parse_commit(struct commit *commit);
 
 extern void cache_prepare(struct cacheitem *item);
 extern int cache_lock(struct cacheitem *item);
 extern int cache_unlock(struct cacheitem *item);
 extern int cache_cancel_lock(struct cacheitem *item);
 extern int cache_exist(struct cacheitem *item);
 extern int cache_expired(struct cacheitem *item);
 
 extern char *cgit_repourl(const char *reponame);
 extern char *cgit_pageurl(const char *reponame, const char *pagename, 
                           const char *query);
 
 extern void cgit_print_error(char *msg);
 extern void cgit_print_date(unsigned long secs);
 extern void cgit_print_docstart(char *title, struct cacheitem *item);
 extern void cgit_print_docend();
 extern void cgit_print_pageheader(char *title);
 
 extern void cgit_print_repolist(struct cacheitem *item);
 extern void cgit_print_summary();
 extern void cgit_print_log(const char *tip, int ofs, int cnt);
 extern void cgit_print_view(const char *hex);
 extern void cgit_print_tree(const char *hex);
 extern void cgit_print_commit(const char *hex);
+extern void cgit_print_diff(const char *old_hex, const char *new_hex);
 
 #endif /* CGIT_H */
diff --git a/shared.c b/shared.c
index b576df8..762eb38 100644
--- a/shared.c
+++ b/shared.c
@@ -1,100 +1,104 @@
 /* shared.c: global vars + some callback functions
  *
  * Copyright (C) 2006 Lars Hjemli
  *
  * Licensed under GNU General Public License v2
  *   (see COPYING for full license text)
  */
 
 #include "cgit.h"
 
 char *cgit_root         = "/usr/src/git";
 char *cgit_root_title   = "Git repository browser";
 char *cgit_css          = "/cgit.css";
 char *cgit_logo         = "/git-logo.png";
 char *cgit_logo_link    = "http://www.kernel.org/pub/software/scm/git/docs/";
 char *cgit_virtual_root = NULL;
 
 char *cgit_cache_root   = "/var/cache/cgit";
 
 int cgit_nocache               =  0;
 int cgit_max_lock_attempts     =  5;
 int cgit_cache_root_ttl        =  5;
 int cgit_cache_repo_ttl        =  5;
 int cgit_cache_dynamic_ttl     =  5;
 int cgit_cache_static_ttl      = -1;
 int cgit_cache_max_create_time =  5;
 
 char *cgit_repo_name    = NULL;
 char *cgit_repo_desc    = NULL;
 char *cgit_repo_owner   = NULL;
 
 int cgit_query_has_symref = 0;
 int cgit_query_has_sha1   = 0;
 
 char *cgit_querystring  = NULL;
 char *cgit_query_repo   = NULL;
 char *cgit_query_page   = NULL;
 char *cgit_query_head   = NULL;
 char *cgit_query_sha1   = NULL;
+char *cgit_query_sha2   = NULL;
 int   cgit_query_ofs    = 0;
 
 int htmlfd = 0;
 
 void cgit_global_config_cb(const char *name, const char *value)
 {
         if (!strcmp(name, "root"))
                 cgit_root = xstrdup(value);
         else if (!strcmp(name, "root-title"))
                 cgit_root_title = xstrdup(value);
         else if (!strcmp(name, "css"))
                 cgit_css = xstrdup(value);
         else if (!strcmp(name, "logo"))
                 cgit_logo = xstrdup(value);
         else if (!strcmp(name, "logo-link"))
                 cgit_logo_link = xstrdup(value);
         else if (!strcmp(name, "virtual-root"))
                 cgit_virtual_root = xstrdup(value);
         else if (!strcmp(name, "nocache"))
                 cgit_nocache = atoi(value);
         else if (!strcmp(name, "cache-root"))
                 cgit_cache_root = xstrdup(value);
 }
 
 void cgit_repo_config_cb(const char *name, const char *value)
 {
         if (!strcmp(name, "name"))
                 cgit_repo_name = xstrdup(value);
         else if (!strcmp(name, "desc"))
                 cgit_repo_desc = xstrdup(value);
         else if (!strcmp(name, "owner"))
                 cgit_repo_owner = xstrdup(value);
 }
 
 void cgit_querystring_cb(const char *name, const char *value)
 {
         if (!strcmp(name,"r")) {
                 cgit_query_repo = xstrdup(value);
         } else if (!strcmp(name, "p")) {
                 cgit_query_page = xstrdup(value);
         } else if (!strcmp(name, "h")) {
                 cgit_query_head = xstrdup(value);
                 cgit_query_has_symref = 1;
         } else if (!strcmp(name, "id")) {
                 cgit_query_sha1 = xstrdup(value);
                 cgit_query_has_sha1 = 1;
+        } else if (!strcmp(name, "id2")) {
+                cgit_query_sha2 = xstrdup(value);
+                cgit_query_has_sha1 = 1;
         } else if (!strcmp(name, "ofs")) {
                 cgit_query_ofs = atoi(value);
         }
 }
 
 void *cgit_free_commitinfo(struct commitinfo *info)
 {
         free(info->author);
         free(info->author_email);
         free(info->committer);
         free(info->committer_email);
         free(info->subject);
         free(info);
         return NULL;
 }
diff --git a/ui-diff.c b/ui-diff.c
new file mode 100644
index 0000000..0bd9ade
--- a/dev/null
+++ b/ui-diff.c
@@ -0,0 +1,131 @@
+/* ui-diff.c: show diff between two blobs
+ *
+ * Copyright (C) 2006 Lars Hjemli
+ *
+ * Licensed under GNU General Public License v2
+ *   (see COPYING for full license text)
+ */
+
+#include "cgit.h"
+#include "xdiff.h"
+
+char *diff_buffer;
+int diff_buffer_size;
+
+
+/*
+ * print a single line returned from xdiff
+ */
+static void print_line(char *line, int len)
+{
+        char *class = "ctx";
+        char c = line[len-1];
+
+        if (line[0] == '+')
+                class = "add";
+        else if (line[0] == '-')
+                class = "del";
+        else if (line[0] == '@')
+                class = "hunk";
+
+        htmlf("<div class='%s'>", class);
+        line[len-1] = '\0';
+        html_txt(line);
+        html("</div>");
+        line[len-1] = c;
+}
+
+/*
+ * Receive diff-buffers from xdiff and concatenate them as
+ * needed across multiple callbacks.
+ *
+ * This is basically a copy of xdiff-interface.c/xdiff_outf(),
+ * ripped from git and modified to use globals instead of
+ * a special callback-struct.
+ */
+int diff_cb(void *priv_, mmbuffer_t *mb, int nbuf)
+{
+        int i;
+
+        for (i = 0; i < nbuf; i++) {
+                if (mb[i].ptr[mb[i].size-1] != '\n') {
+                        /* Incomplete line */
+                        diff_buffer = xrealloc(diff_buffer,
+                                               diff_buffer_size + mb[i].size);
+                        memcpy(diff_buffer + diff_buffer_size,
+                               mb[i].ptr, mb[i].size);
+                        diff_buffer_size += mb[i].size;
+                        continue;
+                }
+
+                /* we have a complete line */
+                if (!diff_buffer) {
+                        print_line(mb[i].ptr, mb[i].size);
+                        continue;
+                }
+                diff_buffer = xrealloc(diff_buffer,
+                                       diff_buffer_size + mb[i].size);
+                memcpy(diff_buffer + diff_buffer_size, mb[i].ptr, mb[i].size);
+                print_line(diff_buffer, diff_buffer_size + mb[i].size);
+                free(diff_buffer);
+                diff_buffer = NULL;
+                diff_buffer_size = 0;
+        }
+        if (diff_buffer) {
+                print_line(diff_buffer, diff_buffer_size);
+                free(diff_buffer);
+                diff_buffer = NULL;
+                diff_buffer_size = 0;
+        }
+        return 0;
+}
+
+static int load_mmfile(mmfile_t *file, const unsigned char *sha1)
+{
+        char type[20];
+
+        if (is_null_sha1(sha1)) {
+                file->ptr = (char *)"";
+                file->size = 0;
+        } else {
+                file->ptr = read_sha1_file(sha1, type, &file->size);
+        }
+        return 1;
+}
+
+static void run_diff(const unsigned char *sha1, const unsigned char *sha2)
+{
+        mmfile_t file1, file2;
+        xpparam_t diff_params;
+        xdemitconf_t emit_params;
+        xdemitcb_t emit_cb;
+
+        if (!load_mmfile(&file1, sha1) || !load_mmfile(&file2, sha2)) {
+                cgit_print_error("Unable to load files for diff");
+                return;
+        }
+
+        diff_params.flags = XDF_NEED_MINIMAL;
+
+        emit_params.ctxlen = 3;
+        emit_params.flags = XDL_EMIT_FUNCNAMES;
+
+        emit_cb.outf = diff_cb;
+
+        xdl_diff(&file1, &file2, &diff_params, &emit_params, &emit_cb);
+}
+
+
+
+void cgit_print_diff(const char *old_hex, const char *new_hex)
+{
+        unsigned char sha1[20], sha2[20];
+
+        get_sha1(old_hex, sha1);
+        get_sha1(new_hex, sha2);
+
+        html("<h2>diff</h2>\n");
+        html("<table class='diff'><tr><td>");
+        run_diff(sha1, sha2);
+        html("</td></tr></table>");
+}
diff --git a/xdiff.h b/xdiff.h
new file mode 100644
index 0000000..fa409d5
--- a/dev/null
+++ b/xdiff.h
@@ -0,0 +1,105 @@
+/*
+ *  LibXDiff by Davide Libenzi ( File Differential Library )
+ *  Copyright (C) 2003  Davide Libenzi
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library 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
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ *  Davide Libenzi <davidel@xmailserver.org>
+ *
+ */
+
+#if !defined(XDIFF_H)
+#define XDIFF_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* #ifdef __cplusplus */
+
+
+#define XDF_NEED_MINIMAL (1 << 1)
+#define XDF_IGNORE_WHITESPACE (1 << 2)
+#define XDF_IGNORE_WHITESPACE_CHANGE (1 << 3)
+#define XDF_WHITESPACE_FLAGS (XDF_IGNORE_WHITESPACE | XDF_IGNORE_WHITESPACE_CHANGE)
+
+#define XDL_PATCH_NORMAL '-'
+#define XDL_PATCH_REVERSE '+'
+#define XDL_PATCH_MODEMASK ((1 << 8) - 1)
+#define XDL_PATCH_IGNOREBSPACE (1 << 8)
+
+#define XDL_EMIT_FUNCNAMES (1 << 0)
+#define XDL_EMIT_COMMON (1 << 1)
+
+#define XDL_MMB_READONLY (1 << 0)
+
+#define XDL_MMF_ATOMIC (1 << 0)
+
+#define XDL_BDOP_INS 1
+#define XDL_BDOP_CPY 2
+#define XDL_BDOP_INSB 3
+
+#define XDL_MERGE_MINIMAL 0
+#define XDL_MERGE_EAGER 1
+#define XDL_MERGE_ZEALOUS 2
+
+typedef struct s_mmfile {
+        char *ptr;
+        long size;
+} mmfile_t;
+
+typedef struct s_mmbuffer {
+        char *ptr;
+        long size;
+} mmbuffer_t;
+
+typedef struct s_xpparam {
+        unsigned long flags;
+} xpparam_t;
+
+typedef struct s_xdemitcb {
+        void *priv;
+        int (*outf)(void *, mmbuffer_t *, int);
+} xdemitcb_t;
+
+typedef struct s_xdemitconf {
+        long ctxlen;
+        unsigned long flags;
+} xdemitconf_t;
+
+typedef struct s_bdiffparam {
+        long bsize;
+} bdiffparam_t;
+
+
+#define xdl_malloc(x) malloc(x)
+#define xdl_free(ptr) free(ptr)
+#define xdl_realloc(ptr,x) realloc(ptr,x)
+
+void *xdl_mmfile_first(mmfile_t *mmf, long *size);
+void *xdl_mmfile_next(mmfile_t *mmf, long *size);
+long xdl_mmfile_size(mmfile_t *mmf);
+
+int xdl_diff(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp,
+             xdemitconf_t const *xecfg, xdemitcb_t *ecb);
+
+int xdl_merge(mmfile_t *orig, mmfile_t *mf1, const char *name1,
+                mmfile_t *mf2, const char *name2,
+                xpparam_t const *xpp, int level, mmbuffer_t *result);
+
+#ifdef __cplusplus
+}
+#endif /* #ifdef __cplusplus */
+
+#endif /* #if !defined(XDIFF_H) */
+