ui-tree: show hexdump of binary blobs

This teaches ui-tree to detect binary blobs and display them similar
to `hexdump -C` (only wider).

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

2 files changed, 67 insertions, 23 deletions

diff --git a/cgit.css b/cgit.css
index 957d5aa..adfc8ae 100644
--- a/cgit.css
+++ b/cgit.css
@@ -263,6 +263,25 @@ table.blob a.no a:hover {
         color: black;
 }
 
+table.bin-blob {
+        margin-top: 0.5em;
+        border: solid 1px black;
+}
+
+table.bin-blob th {
+        font-family: monospace;
+        white-space: pre;
+        border: solid 1px #777;
+        padding: 0.5em 1em;
+}
+
+table.bin-blob td {
+        font-family: monospace;
+        white-space: pre;
+        border-left: solid 1px #777;
+        padding: 0em 1em;
+}
+
 table.nowrap td {
         white-space: nowrap;
 }
diff --git a/ui-tree.c b/ui-tree.c
index c26ba4c..a37a4e5 100644
--- a/ui-tree.c
+++ b/ui-tree.c
@@ -6,6 +6,7 @@
  *   (see COPYING for full license text)
  */
 
+#include <ctype.h>
 #include "cgit.h"
 #include "html.h"
 #include "ui-shared.h"
@@ -14,12 +15,53 @@ char *curr_rev;
 char *match_path;
 int header = 0;
 
+static void print_text_buffer(char *buf, unsigned long size)
+{
+        unsigned long lineno, idx;
+        const char *numberfmt =
+                "<a class='no' id='n%1$d' name='n%1$d' href='#n%1$d'>%1$d</a>\n";
+
+        html("<table summary='blob content' class='blob'>\n");
+        html("<tr><td class='linenumbers'><pre>");
+        idx = 0;
+        lineno = 0;
+        htmlf(numberfmt, ++lineno);
+        while(idx < size - 1) { // skip absolute last newline
+                if (buf[idx] == '\n')
+                        htmlf(numberfmt, ++lineno);
+                idx++;
+        }
+        html("</pre></td>\n");
+        html("<td class='lines'><pre><code>");
+        html_txt(buf);
+        html("</code></pre></td></tr></table>\n");
+}
+
+static void print_binary_buffer(char *buf, unsigned long size)
+{
+        unsigned long ofs, idx;
+
+        html("<table summary='blob content' class='bin-blob'>\n");
+        html("<tr><th>ofs</th><th>hex dump</th><th>ascii</th></tr>");
+        for (ofs = 0; ofs < size; ofs += 32, buf += 32) {
+                htmlf("<tr><td class='right'>%04x</td><td class='hex'>", ofs);
+                for (idx = 0; idx < 32 && ofs + idx < size; idx++)
+                        htmlf("%*s%02x",
+                              idx == 16 ? 4 : 1, "",
+                              buf[idx] & 0xff);
+                html(" </td><td class='hex'>");
+                for (idx = 0; idx < 32 && ofs + idx < size; idx++)
+                        htmlf("%c", isgraph(buf[idx]) ? buf[idx] : '.');
+                html("</td></tr>\n");
+        }
+        html("</table>\n");
+}
+
 static void print_object(const unsigned char *sha1, char *path)
 {
         enum object_type type;
         char *buf;
-        unsigned long size, lineno, idx;
-        const char *numberfmt = "<a class='no' id='n%1$d' name='n%1$d' href='#n%1$d'>%1$d</a>\n";
+        unsigned long size;
 
         type = sha1_object_info(sha1, &size);
         if (type == OBJ_BAD) {
@@ -40,27 +82,10 @@ static void print_object(const unsigned char *sha1, char *path)
                         curr_rev, path);
         htmlf(")<br/>blob: %s\n", sha1_to_hex(sha1));
 
-        html("<table summary='blob content' class='blob'>\n");
-        html("<tr>\n");
-
-        html("<td class='linenumbers'><pre>");
-        idx = 0;
-        lineno = 0;
-        htmlf(numberfmt, ++lineno);
-        while(idx < size - 1) { // skip absolute last newline
-                if (buf[idx] == '\n') {
-                        htmlf(numberfmt, ++lineno);
-                }
-                idx++;
-        }
-        html("</pre></td>\n");
-
-        html("<td class='lines'><pre><code>");
-        html_txt(buf);
-        html("</code></pre></td>\n");
-
-        html("</tr>\n");
-        html("</table>\n");
+        if (buffer_is_binary(buf, size))
+                print_binary_buffer(buf, size);
+        else
+                print_text_buffer(buf, size);
 }