[giflib] Add giflib (#2062)

* Add initial version of giflib

* Fix a memory leak in dgif_target

This commit fixes a memory that was caused by calling the wrong
close function.

* giflib: Minor bug fixes that also addressees most comments from Doris

projects/giflib/Dockerfile

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+# Copyright 2018 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+################################################################################
+
+FROM gcr.io/oss-fuzz-base/base-builder
+MAINTAINER esr@thyrsus.com
+RUN apt-get update && apt-get install -y make autoconf automake libtool wget
+RUN git clone --depth=1 https://git.code.sf.net/p/giflib/code $SRC/giflib-code
+COPY *.c *.options build.sh $SRC/

projects/giflib/build.sh

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+cd $SRC/giflib-code
+./autogen.sh
+make
+cd ..
+for file in $SRC/*.c;
+do
+    name=$(basename $file .c)
+    $CC $CFLAGS -c -I giflib-code/lib ${file} -o ${name}.o
+    $CXX $CXXFLAGS -std=c++11 -I giflib-code/lib ${name}.o \
+        -o $OUT/${name} -lFuzzingEngine giflib-code/lib/.libs/libgif.a
+done
+# Place dict and config in OUT
+wget -O $OUT/gif.dict \
+  https://raw.githubusercontent.com/mirrorer/afl/master/dictionaries/gif.dict \
+  &> /dev/null
+cp $SRC/*.options $OUT/
+find $SRC/giflib-code -iname "*.gif" -exec \
+  zip -ujq $OUT/dgif_target_seed_corpus.zip "{}" \;

projects/giflib/dgif_target.c

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+/*****************************************************************************
+
+gif2rgb - convert GIF to 24-bit RGB pixel triples or vice-versa
+
+*****************************************************************************/
+
+/***************************************************************************
+
+Toshio Kuratomi had written this in a comment about the rgb2gif code:
+
+  Besides fixing bugs, what's really needed is for someone to work out how to
+  calculate a colormap for writing GIFs from rgb sources.  Right now, an rgb
+  source that has only two colors (b/w) is being converted into an 8 bit GIF....
+  Which is horrendously wasteful without compression.
+
+I (ESR) took this off the main to-do list in 2012 because I don't think
+the GIFLIB project actually needs to be in the converters-and-tools business.
+Plenty of hackers do that; our job is to supply stable library capability
+with our utilities mainly interesting as test tools.
+
+***************************************************************************/
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <ctype.h>
+#include <string.h>
+#include <stdbool.h>
+#include <fcntl.h>
+#include <stdint.h>
+
+#ifdef _WIN32
+#include <io.h>
+#endif /* _WIN32 */
+
+#include "gif_lib.h"
+
+#define PROGRAM_NAME "gif2rgb"
+
+/* ===========================================================================
+ * Display error message and exit
+ */
+void fuzz_error(const char *msg)
+{
+    fprintf(stderr, "%s: %s\n", "gif2rgb_fuzzer", msg);
+    exit(1);
+}
+/* end */
+
+int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)
+{
+	char *inFileName = "/tmp/gif.gif";
+	FILE *in = fopen(inFileName, "w");
+	if(in==NULL){
+		fuzz_error("failed fopen");
+	}
+	int Error = 0;
+	if (fwrite(Data, 1, (unsigned)Size, in) != Size)
+		fuzz_error("failed fwrite");
+	if (fclose(in))
+		fuzz_error("failed fclose");
+	GifFileType *GifFile;
+	GifFile = DGifOpenFileName(inFileName, &Error);
+	if (GifFile == NULL){
+		return 0;
+	}
+	DGifSlurp(GifFile);
+
+	DGifCloseFile(GifFile, &Error);
+	return 0;
+}

projects/giflib/dgif_target.options

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+[libfuzzer]
+dict = gif.dict

projects/giflib/gif.dict

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+#
+# AFL dictionary for GIF images
+# -----------------------------
+#
+# Created by Michal Zalewski <lcamtuf@google.com>
+#
+
+header_87a="87a"
+header_89a="89a"
+header_gif="GIF"
+
+marker_2c=","
+marker_3b=";"
+
+section_2101="!\x01\x12"
+section_21f9="!\xf9\x04"
+section_21fe="!\xfe"
+section_21ff="!\xff\x11"
+

projects/giflib/project.yaml

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+homepage: "http://giflib.sourceforge.net/"
+primary_contact: "esr@thyrsus.com"
+auto_ccs:
+  - "vincent.ulitzsch@live.de"
+  - "bshas3@gmail.com"