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-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,
207 } 207 }
208} 208}
209 209
210static int load_mmfile(mmfile_t *file, const unsigned char *sha1)
211{
212 enum object_type type;
213
214 if (is_null_sha1(sha1)) {
215 file->ptr = (char *)"";
216 file->size = 0;
217 } else {
218 file->ptr = read_sha1_file(sha1, &type, &file->size);
219 }
220 return 1;
221}
222
223/*
224 * Receive diff-buffers from xdiff and concatenate them as
225 * needed across multiple callbacks.
226 *
227 * This is basically a copy of xdiff-interface.c/xdiff_outf(),
228 * ripped from git and modified to use globals instead of
229 * a special callback-struct.
230 */
231char *diffbuf = NULL;
232int buflen = 0;
233
234int filediff_cb(void *priv, mmbuffer_t *mb, int nbuf)
235{
236 int i;
237
238 for (i = 0; i < nbuf; i++) {
239 if (mb[i].ptr[mb[i].size-1] != '\n') {
240 /* Incomplete line */
241 diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
242 memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
243 buflen += mb[i].size;
244 continue;
245 }
246
247 /* we have a complete line */
248 if (!diffbuf) {
249 ((linediff_fn)priv)(mb[i].ptr, mb[i].size);
250 continue;
251 }
252 diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
253 memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
254 ((linediff_fn)priv)(diffbuf, buflen + mb[i].size);
255 free(diffbuf);
256 diffbuf = NULL;
257 buflen = 0;
258 }
259 if (diffbuf) {
260 ((linediff_fn)priv)(diffbuf, buflen);
261 free(diffbuf);
262 diffbuf = NULL;
263 buflen = 0;
264 }
265 return 0;
266}
267
268int cgit_diff_files(const unsigned char *old_sha1,
269 const unsigned char *new_sha1,
270 linediff_fn fn)
271{
272 mmfile_t file1, file2;
273 xpparam_t diff_params;
274 xdemitconf_t emit_params;
275 xdemitcb_t emit_cb;
276
277 if (!load_mmfile(&file1, old_sha1) || !load_mmfile(&file2, new_sha1))
278 return 1;
279
280 diff_params.flags = XDF_NEED_MINIMAL;
281 emit_params.ctxlen = 3;
282 emit_params.flags = XDL_EMIT_FUNCNAMES;
283 emit_cb.outf = filediff_cb;
284 emit_cb.priv = fn;
285 xdl_diff(&file1, &file2, &diff_params, &emit_params, &emit_cb);
286 return 0;
287}
288
210void cgit_diff_tree(const unsigned char *old_sha1, 289void cgit_diff_tree(const unsigned char *old_sha1,
211 const unsigned char *new_sha1, 290 const unsigned char *new_sha1,
212 filepair_fn fn) 291 filepair_fn fn)