libwebp: Unicode command tools on Windows

Define macros in examples/unicode.h to use Unicode argv
on Windows. Keep char everywhere on Unix since it handles
UTF-8 without any change.

Impact:
 - All fopen () and SHCreateStreamOnFile(),
 - All fprintf() printing file paths,
 - All strcmp() used with "-",
 - File path parsing,
 - Gif reading.

Concerned executables from examples/ and extras/:
  anim_diff, anim_dump, vwebp, vwebp_sdl,
  cwebp, dwebp, gif2webp, img2webp,
  webpmux, webpinfo, webp_quality, get_disto

When compiled on Windows with Unicode enabled, webpmux and
img2webp will not work when used with an argument file and
will print "Reading arguments from a file is a feature
unavailable with Unicode binaries."

BUG=webp:398

Change-Id: Ic55d222a3ce1a715f9c4cce57ecbe2705d5ce317

extras/get_disto.c

@@ -26,6 +26,7 @@
 #include "webp/encode.h"
 #include "imageio/image_dec.h"
 #include "imageio/imageio_util.h"
+#include "../examples/unicode.h"
 
 static size_t ReadPicture(const char* const filename, WebPPicture* const pic,
                           int keep_alpha) {
@@ -48,7 +49,8 @@ static size_t ReadPicture(const char* const filename, WebPPicture* const pic,
 
  End:
   if (!ok) {
-    fprintf(stderr, "Error! Could not process file %s\n", filename);
+    WFPRINTF(stderr, "Error! Could not process file %s\n",
+             (const W_CHAR*)filename);
   }
   free((void*)data);
   return ok ? data_size : 0;
@@ -239,9 +241,11 @@ int main(int argc, const char *argv[]) {
   const char* name2 = NULL;
   const char* output = NULL;
 
+  INIT_WARGV(argc, argv);
+
   if (!WebPPictureInit(&pic1) || !WebPPictureInit(&pic2)) {
     fprintf(stderr, "Can't init pictures\n");
-    return 1;
+    FREE_WARGV_AND_RETURN(1);
   }
 
   for (c = 1; c < argc; ++c) {
@@ -263,11 +267,11 @@ int main(int argc, const char *argv[]) {
         fprintf(stderr, "missing file name after %s option.\n", argv[c - 1]);
         goto End;
       }
-      output = argv[c];
+      output = (const char*)GET_WARGV(argv, c);
     } else if (name1 == NULL) {
-      name1 = argv[c];
+      name1 = (const char*)GET_WARGV(argv, c);
     } else {
-      name2 = argv[c];
+      name2 = (const char*)GET_WARGV(argv, c);
     }
   }
   if (help || name1 == NULL || name2 == NULL) {
@@ -347,5 +351,5 @@ int main(int argc, const char *argv[]) {
  End:
   WebPPictureFree(&pic1);
   WebPPictureFree(&pic2);
-  return ret;
+  FREE_WARGV_AND_RETURN(ret);
 }

extras/vwebp_sdl.c

@@ -25,6 +25,7 @@
 #include "webp_to_sdl.h"
 #include "webp/decode.h"
 #include "imageio/imageio_util.h"
+#include "../examples/unicode.h"
 
 #if defined(WEBP_HAVE_JUST_SDL_H)
 #include <SDL.h>
@@ -51,19 +52,22 @@ static void ProcessEvents(void) {
 int main(int argc, char* argv[]) {
   int c;
   int ok = 0;
+
+  INIT_WARGV(argc, argv);
+
   for (c = 1; c < argc; ++c) {
     const char* file = NULL;
     const uint8_t* webp = NULL;
     size_t webp_size = 0;
     if (!strcmp(argv[c], "-h")) {
       printf("Usage: %s [-h] image.webp [more_files.webp...]\n", argv[0]);
-      return 0;
+      FREE_WARGV_AND_RETURN(0);
     } else {
-      file = argv[c];
+      file = (const char*)GET_WARGV(argv, c);
     }
     if (file == NULL) continue;
     if (!ImgIoUtilReadFile(file, &webp, &webp_size)) {
-      fprintf(stderr, "Error opening file: %s\n", file);
+      WFPRINTF(stderr, "Error opening file: %s\n", (const W_CHAR*)file);
       goto Error;
     }
     if (webp_size != (size_t)(int)webp_size) {
@@ -73,7 +77,7 @@ int main(int argc, char* argv[]) {
     ok = WebpToSDL((const char*)webp, (int)webp_size);
     free((void*)webp);
     if (!ok) {
-      fprintf(stderr, "Error decoding file %s\n", file);
+      WFPRINTF(stderr, "Error decoding file %s\n", (const W_CHAR*)file);
       goto Error;
     }
     ProcessEvents();
@@ -82,7 +86,7 @@ int main(int argc, char* argv[]) {
 
  Error:
   SDL_Quit();
-  return ok ? 0 : 1;
+  FREE_WARGV_AND_RETURN(ok ? 0 : 1);
 }
 
 #else  // !WEBP_HAVE_SDL

extras/webp_quality.c

@@ -13,26 +13,30 @@
 
 #include "extras/extras.h"
 #include "imageio/imageio_util.h"
+#include "../examples/unicode.h"
 
 int main(int argc, const char *argv[]) {
   int c;
   int quiet = 0;
   int ok = 1;
+
+  INIT_WARGV(argc, argv);
+
   for (c = 1; ok && c < argc; ++c) {
     if (!strcmp(argv[c], "-quiet")) {
       quiet = 1;
     } else if (!strcmp(argv[c], "-help") || !strcmp(argv[c], "-h")) {
       printf("webp_quality [-h][-quiet] webp_files...\n");
-      return 0;
+      FREE_WARGV_AND_RETURN(0);
     } else {
-      const char* const filename = argv[c];
+      const char* const filename = (const char*)GET_WARGV(argv, c);
       const uint8_t* data = NULL;
       size_t data_size = 0;
       int q;
       ok = ImgIoUtilReadFile(filename, &data, &data_size);
       if (!ok) break;
       q = VP8EstimateQuality(data, data_size);
-      if (!quiet) printf("[%s] ", filename);
+      if (!quiet) WPRINTF("[%s] ", (const W_CHAR*)filename);
       if (q < 0) {
         fprintf(stderr, "Not a WebP file, or not a lossy WebP file.\n");
         ok = 0;
@@ -46,5 +50,5 @@ int main(int argc, const char *argv[]) {
       free((void*)data);
     }
   }
-  return ok ? 0 : 1;
+  FREE_WARGV_AND_RETURN(ok ? 0 : 1);
 }