make patch_delta() error cases a bit more verbose

It is especially important to distinguish between a malloc() failure
from all the other cases.  An out of memory condition is much less
worrisome than a compatibility/corruption problem.

Also make test-delta compilable again.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/Makefile b/Makefile
index 05cfe45b104d6860c3918f1c80596403ae73e5f7..8919dabc781867e121238dd8dd0a05a8ac02586e 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -796,8 +796,8 @@ test: all
 test-date$X: test-date.c date.o ctype.o
        $(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) test-date.c date.o ctype.o
 
-test-delta$X: test-delta.c diff-delta.o patch-delta.o
-       $(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $^
+test-delta$X: test-delta.o diff-delta.o patch-delta.o $(GITLIBS)
+       $(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) $(LIBS)
 
 test-dump-cache-tree$X: dump-cache-tree.o $(GITLIBS)
        $(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) $(LIBS)

diff --git a/patch-delta.c b/patch-delta.c
index e3a1d425ee2e333bce0f87b1e50fc112a8ec51a3..ed9db81fa82c812c9ffa07f5a40540dbb15da0d3 100644 (file)
--- a/patch-delta.c
+++ b/patch-delta.c
@@ -9,8 +9,7 @@
  * published by the Free Software Foundation.
  */
 
-#include <stdlib.h>
-#include <string.h>
+#include "git-compat-util.h"
 #include "delta.h"
 
 void *patch_delta(const void *src_buf, unsigned long src_size,
@@ -34,9 +33,7 @@ void *patch_delta(const void *src_buf, unsigned long src_size,
 
        /* now the result size */
        size = get_delta_hdr_size(&data, top);
-       dst_buf = malloc(size + 1);
-       if (!dst_buf)
-               return NULL;
+       dst_buf = xmalloc(size + 1);
        dst_buf[size] = 0;
 
        out = dst_buf;
@@ -55,13 +52,13 @@ void *patch_delta(const void *src_buf, unsigned long src_size,
                        if (cp_off + cp_size < cp_size ||
                            cp_off + cp_size > src_size ||
                            cp_size > size)
-                               goto bad;
+                               break;
                        memcpy(out, (char *) src_buf + cp_off, cp_size);
                        out += cp_size;
                        size -= cp_size;
                } else if (cmd) {
                        if (cmd > size)
-                               goto bad;
+                               break;
                        memcpy(out, data, cmd);
                        out += cmd;
                        data += cmd;
@@ -72,12 +69,14 @@ void *patch_delta(const void *src_buf, unsigned long src_size,
                         * extensions. In the mean time we must fail when
                         * encountering them (might be data corruption).
                         */
+                       error("unexpected delta opcode 0");
                        goto bad;
                }
        }
 
        /* sanity check */
        if (data != top || size != 0) {
+               error("delta replay has gone wild");
                bad:
                free(dst_buf);
                return NULL;