apply: fix binary patch detection.

The comparison to find "Binary files " string was looking at a
wrong place when offset != 0.

Also, we may have the full 40-byte textual sha1 on the index
line; two off-by-one errors prevented it.

Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/apply.c b/apply.c
index 3418118..590adc6 100644 (file)
--- a/apply.c
+++ b/apply.c
@@ -370,7 +370,7 @@ static int gitdiff_index(const char *line, struct patch *patch)
        int len;
 
        ptr = strchr(line, '.');
-       if (!ptr || ptr[1] != '.' || 40 <= ptr - line)
+       if (!ptr || ptr[1] != '.' || 40 < ptr - line)
                return 0;
        len = ptr - line;
        memcpy(patch->old_sha1_prefix, line, len);
@@ -384,7 +384,7 @@ static int gitdiff_index(const char *line, struct patch *patch)
                ptr = eol;
        len = ptr - line;
 
-       if (40 <= len)
+       if (40 < len)
                return 0;
        memcpy(patch->new_sha1_prefix, line, len);
        patch->new_sha1_prefix[len] = 0;
@@ -895,7 +895,8 @@ static int parse_chunk(char *buffer, unsigned long size, struct patch *patch)
                static const char binhdr[] = "Binary files ";
 
                if (sizeof(binhdr) - 1 < size - offset - hdrsize &&
-                   !memcmp(binhdr, buffer + hdrsize, sizeof(binhdr)-1))
+                   !memcmp(binhdr, buffer + hdrsize + offset,
+                           sizeof(binhdr)-1))
                        patch->is_binary = 1;
 
                if (patch->is_binary && !apply && !check)