Add an Emacs interface in contrib.

diff --git a/patch-delta.c b/patch-delta.c
index b68dd13c63be4a3834354916398b1ab4827334cc..c0e13114351c4ea427ddfe4d9e9c20a541201ad6 100644 (file)
--- a/patch-delta.c
+++ b/patch-delta.c
@@ -20,55 +20,39 @@ void *patch_delta(void *src_buf, unsigned long src_size,
        const unsigned char *data, *top;
        unsigned char *dst_buf, *out, cmd;
        unsigned long size;
-       int i;
 
-       /* the smallest delta size possible is 4 bytes */
-       if (delta_size < 4)
+       if (delta_size < DELTA_SIZE_MIN)
                return NULL;
 
        data = delta_buf;
        top = delta_buf + delta_size;
 
        /* make sure the orig file size matches what we expect */
-       cmd = *data++;
-       size = cmd & ~0x80;
-       i = 7;
-       while (cmd & 0x80) {
-               cmd = *data++;
-               size |= (cmd & ~0x80) << i;
-               i += 7;
-       }
+       size = get_delta_hdr_size(&data);
        if (size != src_size)
                return NULL;
 
        /* now the result size */
-       cmd = *data++;
-       size = cmd & ~0x80;
-       i = 7;
-       while (cmd & 0x80) {
-               cmd = *data++;
-               size |= (cmd & ~0x80) << i;
-               i += 7;
-       }
-       dst_buf = malloc(size);
+       size = get_delta_hdr_size(&data);
+       dst_buf = malloc(size + 1);
        if (!dst_buf)
                return NULL;
+       dst_buf[size] = 0;
 
        out = dst_buf;
        while (data < top) {
                cmd = *data++;
                if (cmd & 0x80) {
                        unsigned long cp_off = 0, cp_size = 0;
-                       const unsigned char *buf;
                        if (cmd & 0x01) cp_off = *data++;
                        if (cmd & 0x02) cp_off |= (*data++ << 8);
                        if (cmd & 0x04) cp_off |= (*data++ << 16);
                        if (cmd & 0x08) cp_off |= (*data++ << 24);
                        if (cmd & 0x10) cp_size = *data++;
                        if (cmd & 0x20) cp_size |= (*data++ << 8);
+                       if (cmd & 0x40) cp_size |= (*data++ << 16);
                        if (cp_size == 0) cp_size = 0x10000;
-                       buf = (cmd & 0x40) ? dst_buf : src_buf;
-                       memcpy(out, buf + cp_off, cp_size);
+                       memcpy(out, src_buf + cp_off, cp_size);
                        out += cp_size;
                } else {
                        memcpy(out, data, cmd);