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authorLars Hjemli <hjemli@gmail.com>2007-05-13 14:21:19 +0200
committerLars Hjemli <hjemli@gmail.com>2007-05-13 14:21:19 +0200
commitc4ef667961ef4668c9449124f97d55b9ac46c059 (patch)
tree3e1d3ed9dbf2bac55d0ffbcd2909c5d935fae48b /shared.c
parent48dc00342effe3ba530ff6cbb79e5d0d5fc740fd (diff)
Add standard interface for file diff functions
Signed-off-by: Lars Hjemli <hjemli@gmail.com>
Diffstat (limited to 'shared.c')
-rw-r--r--shared.c79
1 files changed, 79 insertions, 0 deletions
diff --git a/shared.c b/shared.c
index f8a17b6..801f68d 100644
--- a/shared.c
+++ b/shared.c
@@ -207,6 +207,85 @@ void cgit_diff_tree_cb(struct diff_queue_struct *q,
}
}
+static int load_mmfile(mmfile_t *file, const unsigned char *sha1)
+{
+ enum object_type type;
+
+ if (is_null_sha1(sha1)) {
+ file->ptr = (char *)"";
+ file->size = 0;
+ } else {
+ file->ptr = read_sha1_file(sha1, &type, &file->size);
+ }
+ return 1;
+}
+
+/*
+ * 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.
+ */
+char *diffbuf = NULL;
+int buflen = 0;
+
+int filediff_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 */
+ diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
+ memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
+ buflen += mb[i].size;
+ continue;
+ }
+
+ /* we have a complete line */
+ if (!diffbuf) {
+ ((linediff_fn)priv)(mb[i].ptr, mb[i].size);
+ continue;
+ }
+ diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
+ memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
+ ((linediff_fn)priv)(diffbuf, buflen + mb[i].size);
+ free(diffbuf);
+ diffbuf = NULL;
+ buflen = 0;
+ }
+ if (diffbuf) {
+ ((linediff_fn)priv)(diffbuf, buflen);
+ free(diffbuf);
+ diffbuf = NULL;
+ buflen = 0;
+ }
+ return 0;
+}
+
+int cgit_diff_files(const unsigned char *old_sha1,
+ const unsigned char *new_sha1,
+ linediff_fn fn)
+{
+ mmfile_t file1, file2;
+ xpparam_t diff_params;
+ xdemitconf_t emit_params;
+ xdemitcb_t emit_cb;
+
+ if (!load_mmfile(&file1, old_sha1) || !load_mmfile(&file2, new_sha1))
+ return 1;
+
+ diff_params.flags = XDF_NEED_MINIMAL;
+ emit_params.ctxlen = 3;
+ emit_params.flags = XDL_EMIT_FUNCNAMES;
+ emit_cb.outf = filediff_cb;
+ emit_cb.priv = fn;
+ xdl_diff(&file1, &file2, &diff_params, &emit_params, &emit_cb);
+ return 0;
+}
+
void cgit_diff_tree(const unsigned char *old_sha1,
const unsigned char *new_sha1,
filepair_fn fn)