refactor userdiff textconv code

diff --git a/diff.c b/diff.c
index d1fd594ba34617e5476a79b5664ca4624400b6b1..6f01595ece4e9934bc9167bdbb61fad362bb7663 100644 (file)
--- a/diff.c
+++ b/diff.c
@@ -294,18 +294,8 @@ static int fill_mmfile(mmfile_t *mf, struct diff_filespec *one)
        else if (diff_populate_filespec(one, 0))
                return -1;
 
-       diff_filespec_load_driver(one);
-       if (one->driver->textconv) {
-               size_t size;
-               mf->ptr = run_textconv(one->driver->textconv, one, &size);
-               if (!mf->ptr)
-                       return -1;
-               mf->size = size;
-       }
-       else {
-               mf->ptr = one->data;
-               mf->size = one->size;
-       }
+       mf->ptr = one->data;
+       mf->size = one->size;
        return 0;
 }
 
@@ -1323,6 +1313,14 @@ void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const
                options->b_prefix = b;
 }
 
+static const char *get_textconv(struct diff_filespec *one)
+{
+       if (!DIFF_FILE_VALID(one))
+               return NULL;
+       diff_filespec_load_driver(one);
+       return one->driver->textconv;
+}
+
 static void builtin_diff(const char *name_a,
                         const char *name_b,
                         struct diff_filespec *one,
@@ -1337,6 +1335,7 @@ static void builtin_diff(const char *name_a,
        const char *set = diff_get_color_opt(o, DIFF_METAINFO);
        const char *reset = diff_get_color_opt(o, DIFF_RESET);
        const char *a_prefix, *b_prefix;
+       const char *textconv_one, *textconv_two;
 
        diff_set_mnemonic_prefix(o, "a/", "b/");
        if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
@@ -1390,8 +1389,12 @@ static void builtin_diff(const char *name_a,
        if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
                die("unable to read files to diff");
 
+       textconv_one = get_textconv(one);
+       textconv_two = get_textconv(two);
+
        if (!DIFF_OPT_TST(o, TEXT) &&
-           (diff_filespec_is_binary(one) || diff_filespec_is_binary(two))) {
+           ( (diff_filespec_is_binary(one) && !textconv_one) ||
+             (diff_filespec_is_binary(two) && !textconv_two) )) {
                /* Quite common confusing case */
                if (mf1.size == mf2.size &&
                    !memcmp(mf1.ptr, mf2.ptr, mf1.size))
@@ -1412,6 +1415,21 @@ static void builtin_diff(const char *name_a,
                struct emit_callback ecbdata;
                const struct userdiff_funcname *pe;
 
+               if (textconv_one) {
+                       size_t size;
+                       mf1.ptr = run_textconv(textconv_one, one, &size);
+                       if (!mf1.ptr)
+                               die("unable to read files to diff");
+                       mf1.size = size;
+               }
+               if (textconv_two) {
+                       size_t size;
+                       mf2.ptr = run_textconv(textconv_two, two, &size);
+                       if (!mf2.ptr)
+                               die("unable to read files to diff");
+                       mf2.size = size;
+               }
+
                pe = diff_funcname_pattern(one);
                if (!pe)
                        pe = diff_funcname_pattern(two);
@@ -1443,6 +1461,10 @@ static void builtin_diff(const char *name_a,
                              &xpp, &xecfg, &ecb);
                if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
                        free_diff_words_data(&ecbdata);
+               if (textconv_one)
+                       free(mf1.ptr);
+               if (textconv_two)
+                       free(mf2.ptr);
        }
 
  free_ab_and_return: