X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=diffcore-rename.c;h=e99269872026c7f08e729acb6ffba7ef3c9c8fd8;hb=16563132977287314fa25348d97d0ffbe019442b;hp=dba965c0b4006251b1da04465d319c5fe9997ea4;hpb=56fc63193975edd4b9f520b6c65c2b97ecd8ee38;p=git.git

diff --git a/diffcore-rename.c b/diffcore-rename.c
index dba965c0..e9926987 100644
--- a/diffcore-rename.c
+++ b/diffcore-rename.c
@@ -4,8 +4,6 @@
 #include "cache.h"
 #include "diff.h"
 #include "diffcore.h"
-#include "delta.h"
-#include "count-delta.h"
 
 /* Table of rename/copy destinations */
 
@@ -135,8 +133,7 @@ static int estimate_similarity(struct diff_filespec *src,
 	 * match than anything else; the destination does not even
 	 * call into this function in that case.
 	 */
-	void *delta;
-	unsigned long delta_size, base_size, src_copied, literal_added;
+	unsigned long max_size, delta_size, base_size, src_copied, literal_added;
 	unsigned long delta_limit;
 	int score;
 
@@ -147,9 +144,9 @@ static int estimate_similarity(struct diff_filespec *src,
 	if (!S_ISREG(src->mode) || !S_ISREG(dst->mode))
 		return 0;
 
-	delta_size = ((src->size < dst->size) ?
-		      (dst->size - src->size) : (src->size - dst->size));
+	max_size = ((src->size > dst->size) ? src->size : dst->size);
 	base_size = ((src->size < dst->size) ? src->size : dst->size);
+	delta_size = max_size - base_size;
 
 	/* We would not consider edits that change the file size so
 	 * drastically.  delta_size must be smaller than
@@ -165,40 +162,22 @@ static int estimate_similarity(struct diff_filespec *src,
 	if (diff_populate_filespec(src, 0) || diff_populate_filespec(dst, 0))
 		return 0; /* error but caught downstream */
 
+
 	delta_limit = base_size * (MAX_SCORE-minimum_score) / MAX_SCORE;
-	delta = diff_delta(src->data, src->size,
-			   dst->data, dst->size,
-			   &delta_size, delta_limit);
-	if (!delta)
-		/* If delta_limit is exceeded, we have too much differences */
+	if (diffcore_count_changes(src->data, src->size,
+				   dst->data, dst->size,
+				   &src->cnt_data, &dst->cnt_data,
+				   delta_limit,
+				   &src_copied, &literal_added))
 		return 0;
 
-	/* A delta that has a lot of literal additions would have
-	 * big delta_size no matter what else it does.
+	/* How similar are they?
+	 * what percentage of material in dst are from source?
 	 */
-	if (base_size * (MAX_SCORE-minimum_score) < delta_size * MAX_SCORE)
-		return 0;
-
-	/* Estimate the edit size by interpreting delta. */
-	if (count_delta(delta, delta_size, &src_copied, &literal_added)) {
-		free(delta);
-		return 0;
-	}
-	free(delta);
-
-	/* Extent of damage */
-	if (src->size + literal_added < src_copied)
-		delta_size = 0;
+	if (!dst->size)
+		score = 0; /* should not happen */
 	else
-		delta_size = (src->size - src_copied) + literal_added;
-
-	/*
-	 * Now we will give some score to it.  100% edit gets 0 points
-	 * and 0% edit gets MAX_SCORE points.
-	 */
-	score = MAX_SCORE - (MAX_SCORE * delta_size / base_size); 
-	if (score < 0) return 0;
-	if (MAX_SCORE < score) return MAX_SCORE;
+		score = src_copied * MAX_SCORE / max_size;
 	return score;
 }
 
@@ -282,7 +261,7 @@ void diffcore_rename(struct diff_options *options)
 		else if (detect_rename == DIFF_DETECT_COPY)
 			register_rename_src(p->one, 1);
 	}
-	if (rename_dst_nr == 0 ||
+	if (rename_dst_nr == 0 || rename_src_nr == 0 ||
 	    (0 < rename_limit && rename_limit < rename_dst_nr))
 		goto cleanup; /* nothing to do */
 
@@ -326,6 +305,8 @@ void diffcore_rename(struct diff_options *options)
 			m->score = estimate_similarity(one, two,
 						       minimum_score);
 		}
+		/* We do not need the text anymore */
+		diff_free_filespec_data(two);
 		dst_cnt++;
 	}
 	/* cost matrix sorted by most to least similar pair */