chore: import upstream snapshot with attribution

third_party/gif/BUILD.bazel

@@ -0,0 +1 @@
+# copybara:uncomment package(default_applicable_licenses = ["//tensorflow:license"])

third_party/gif/gif.BUILD

@@ -0,0 +1,59 @@
+# Description:
+#   A library for decoding and encoding GIF images
+
+licenses(["notice"])  # MIT
+
+exports_files(["COPYING"])
+
+cc_library(
+    name = "gif",
+    srcs = [
+        "dgif_lib.c",
+        "egif_lib.c",
+        "gif_err.c",
+        "gif_font.c",
+        "gif_hash.c",
+        "gif_hash.h",
+        "gif_lib_private.h",
+        "gifalloc.c",
+        "openbsd-reallocarray.c",
+        "quantize.c",
+    ],
+    hdrs = ["gif_lib.h"],
+    defines = select({
+        ":android": [
+            "S_IREAD=S_IRUSR",
+            "S_IWRITE=S_IWUSR",
+            "S_IEXEC=S_IXUSR",
+        ],
+        "//conditions:default": [],
+    }),
+    includes = ["."],
+    visibility = ["//visibility:public"],
+    deps = select({
+        ":windows": [":windows_polyfill"],
+        "//conditions:default": [],
+    }),
+)
+
+cc_library(
+    name = "windows_polyfill",
+    hdrs = ["windows/unistd.h"],
+    includes = ["windows"],
+)
+
+genrule(
+    name = "windows_unistd_h",
+    outs = ["windows/unistd.h"],
+    cmd = "touch $@",
+)
+
+config_setting(
+    name = "windows",
+    constraint_values = ["@platforms//os:windows"],
+)
+
+config_setting(
+    name = "android",
+    values = {"crosstool_top": "//external:android/crosstool"},
+)

third_party/gif/gif_fix_image_counter.patch

@@ -0,0 +1,89 @@
+diff --git a/dgif_lib.c b/dgif_lib.c
+index 82fc097..214a0e7 100644
+--- a/dgif_lib.c
++++ b/dgif_lib.c
+@@ -810,7 +810,8 @@ DGifSetupDecompress(GifFileType *GifFile)
+ 
+     /* coverity[check_return] */
+     if (InternalRead(GifFile, &CodeSize, 1) < 1) {    /* Read Code size from file. */
+-	return GIF_ERROR;    /* Failed to read Code size. */
++        GifFile->Error = D_GIF_ERR_READ_FAILED;
++        return GIF_ERROR;    /* Failed to read Code size. */
+     }
+     BitsPerPixel = CodeSize;
+ 
+@@ -1118,6 +1119,31 @@ DGifBufferedInput(GifFileType *GifFile, GifByteType *Buf, GifByteType *NextByte)
+     return GIF_OK;
+ }
+ 
++/******************************************************************************
++ This routine is called in case of error during parsing image. We need to
++ decrease image counter and reallocate memory for saved images. Not decreasing
++ ImageCount may lead to null pointer dereference, because the last element in
++ SavedImages may point to the spoilt image and null pointer buffers. 
++*******************************************************************************/
++void
++DGifDecreaseImageCounter(GifFileType *GifFile)
++{
++    GifFile->ImageCount--;
++    if (GifFile->SavedImages[GifFile->ImageCount].RasterBits != NULL) {
++        free(GifFile->SavedImages[GifFile->ImageCount].RasterBits);
++    }
++    if (GifFile->SavedImages[GifFile->ImageCount].ImageDesc.ColorMap != NULL) {
++        GifFreeMapObject(GifFile->SavedImages[GifFile->ImageCount].ImageDesc.ColorMap);
++    }
++    
++    // Realloc array according to the new image counter.
++    SavedImage *correct_saved_images = (SavedImage *)reallocarray(
++        GifFile->SavedImages, GifFile->ImageCount, sizeof(SavedImage));
++    if (correct_saved_images != NULL) {
++        GifFile->SavedImages = correct_saved_images;
++    }
++}
++
+ /******************************************************************************
+  This routine reads an entire GIF into core, hanging all its state info off
+  the GifFileType pointer.  Call DGifOpenFileName() or DGifOpenFileHandle()
+@@ -1148,17 +1174,20 @@ DGifSlurp(GifFileType *GifFile)
+               /* Allocate memory for the image */
+               if (sp->ImageDesc.Width <= 0 || sp->ImageDesc.Height <= 0 ||
+                       sp->ImageDesc.Width > (INT_MAX / sp->ImageDesc.Height)) {
++                  DGifDecreaseImageCounter(GifFile);
+                   return GIF_ERROR;
+               }
+               ImageSize = sp->ImageDesc.Width * sp->ImageDesc.Height;
+ 
+               if (ImageSize > (SIZE_MAX / sizeof(GifPixelType))) {
++                  DGifDecreaseImageCounter(GifFile);
+                   return GIF_ERROR;
+               }
+               sp->RasterBits = (unsigned char *)reallocarray(NULL, ImageSize,
+                       sizeof(GifPixelType));
+ 
+               if (sp->RasterBits == NULL) {
++                  DGifDecreaseImageCounter(GifFile);
+                   return GIF_ERROR;
+               }
+ 
+@@ -1177,13 +1206,17 @@ DGifSlurp(GifFileType *GifFile)
+ 			   j += InterlacedJumps[i]) {
+ 			  if (DGifGetLine(GifFile, 
+ 					  sp->RasterBits+j*sp->ImageDesc.Width, 
+-					  sp->ImageDesc.Width) == GIF_ERROR)
+-			      return GIF_ERROR;
++					  sp->ImageDesc.Width) == GIF_ERROR) {
++                              DGifDecreaseImageCounter(GifFile);
++                              return GIF_ERROR;
++                          }
+ 		      }
+ 	      }
+ 	      else {
+-		  if (DGifGetLine(GifFile,sp->RasterBits,ImageSize)==GIF_ERROR)
+-		      return (GIF_ERROR);
++                  if (DGifGetLine(GifFile,sp->RasterBits,ImageSize)==GIF_ERROR) {
++                      DGifDecreaseImageCounter(GifFile);
++                      return GIF_ERROR;
++                  }
+ 	      }
+ 
+               if (GifFile->ExtensionBlocks) {

third_party/gif/gif_fix_strtok_r.patch

@@ -0,0 +1,15 @@
+diff -r -u ./fixed_gif_font.c ./gif_font.c
+--- ./fixed_gif_font.c	2019-09-05 11:05:25.009598262 -0700
++++ ./gif_font.c	2019-09-05 10:52:45.308389085 -0700
+@@ -11,6 +11,11 @@
+
+ #include "gif_lib.h"
+
++// Windows doesn't have strtok_r.
++#if defined(WIN32) || defined(_WIN32) || defined(__WIN32) && !defined(__CYGWIN__)
++#define strtok_r strtok_s
++#endif
++
+ /*****************************************************************************
+  Ascii 8 by 8 regular font - only first 128 characters are supported.
+ *****************************************************************************/

third_party/gif/workspace.bzl

@@ -0,0 +1,17 @@
+"""Loads the gif library, used by TF."""
+
+load("//third_party:repo.bzl", "tf_http_archive", "tf_mirror_urls")
+
+def repo():
+    tf_http_archive(
+        name = "gif",
+        build_file = "//third_party/gif:gif.BUILD",
+        patch_file = [
+            "//third_party/gif:gif_fix_strtok_r.patch",
+            "//third_party/gif:gif_fix_image_counter.patch",
+        ],
+        sha256 = "31da5562f44c5f15d63340a09a4fd62b48c45620cd302f77a6d9acf0077879bd",
+        strip_prefix = "giflib-5.2.1",
+        system_build_file = "//third_party/systemlibs:gif.BUILD",
+        urls = tf_mirror_urls("https://pilotfiber.dl.sourceforge.net/project/giflib/giflib-5.2.1.tar.gz"),
+    )