checkout-index: plug memory leak from prefix_path()

diff --git a/diff-delta.c b/diff-delta.c
index aaee7be4d20dade99d351f6bdd70632cf249230e..5bc22047f8715b0b1e628ab5ba93afa68e2ccc9e 100644 (file)
--- a/diff-delta.c
+++ b/diff-delta.c
@@ -131,12 +131,13 @@ static struct index ** delta_index(const unsigned char *buf,
 /* the maximum size for any opcode */
 #define MAX_OP_SIZE COPYOP_SIZE(0xffffffff, 0xffffffff)
 
-void *diff_delta(void *from_buf, unsigned long from_size,
-                void *to_buf, unsigned long to_size,
+void *diff_delta(const void *from_buf, unsigned long from_size,
+                const void *to_buf, unsigned long to_size,
                 unsigned long *delta_size,
                 unsigned long max_size)
 {
-       unsigned int i, outpos, outsize, inscnt, hash_shift;
+       unsigned int i, outpos, outsize, hash_shift;
+       int inscnt;
        const unsigned char *ref_data, *ref_top, *data, *top;
        unsigned char *out;
        struct index *entry, **hash;
@@ -222,6 +223,20 @@ void *diff_delta(void *from_buf, unsigned long from_size,
                        unsigned char *op;
 
                        if (inscnt) {
+                               while (moff && ref_data[moff-1] == data[-1]) {
+                                       if (msize == 0x10000)
+                                               break;
+                                       /* we can match one byte back */
+                                       msize++;
+                                       moff--;
+                                       data--;
+                                       outpos--;
+                                       if (--inscnt)
+                                               continue;
+                                       outpos--;  /* remove count slot */
+                                       inscnt--;  /* make it -1 */
+                                       break;
+                               }
                                out[outpos - inscnt - 1] = inscnt;
                                inscnt = 0;
                        }