[draco] Add fuzz target for 3D mesh/point cloud decoding

projects/draco/Dockerfile

@@ -1,21 +1,5 @@
-# Copyright 2020 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
-RUN apt-get update && apt-get install -y git cmake make pkg-config
-RUN git clone --depth 1 https://github.com/google/draco draco
-COPY build.sh $SRC/
-WORKDIR $WORK/
+RUN apt-get update && apt-get install -y cmake
+RUN git clone --depth 1 https://github.com/google/draco.git /src/draco
+COPY build.sh fuzz_decode.cc $SRC/
+WORKDIR $SRC/draco

projects/draco/build.sh

@@ -1,5 +1,5 @@
 #!/bin/bash -eu
-# Copyright 2020 Google Inc.
+# Copyright 2026 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -12,7 +12,15 @@
 # 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.
-#
-################################################################################
 
-sh $SRC/draco/src/draco/tools/fuzz/build.sh
+mkdir build && cd build
+cmake -DCMAKE_C_COMPILER="$CC" -DCMAKE_CXX_COMPILER="$CXX" \
+      -DCMAKE_C_FLAGS="$CFLAGS" -DCMAKE_CXX_FLAGS="$CXXFLAGS" \
+      -DDRACO_TESTS=OFF -DDRACO_JS_GLUE=OFF ..
+make -j$(nproc) draco_static
+
+cd $SRC
+$CXX $CXXFLAGS $LIB_FUZZING_ENGINE fuzz_decode.cc \
+    -I/src/draco/src -I/src/draco/build \
+    /src/draco/build/libdraco.a \
+    -o $OUT/fuzz_decode

projects/draco/fuzz_decode.cc

@@ -0,0 +1,60 @@
+// Copyright 2026 Google LLC
+//
+// 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.
+
+// Fuzz target for Draco 3D mesh/point cloud decoding.
+// Exercises DecodeMeshFromBuffer and DecodePointCloudFromBuffer on
+// arbitrary (potentially malformed) compressed geometry data.
+
+#include <cstddef>
+#include <cstdint>
+#include <memory>
+
+#include "draco/compression/decode.h"
+#include "draco/core/decoder_buffer.h"
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+  draco::DecoderBuffer buffer;
+  buffer.Init(reinterpret_cast<const char *>(data), size);
+
+  draco::Decoder decoder;
+
+  // Try decoding as mesh first, then as point cloud.
+  auto mesh_status = decoder.DecodeMeshFromBuffer(&buffer);
+  if (mesh_status.ok()) {
+    auto mesh = std::move(mesh_status).value();
+    // Access decoded data to exercise attribute accessors.
+    for (int i = 0; i < mesh->num_attributes(); ++i) {
+      auto attr = mesh->attribute(i);
+      if (attr && mesh->num_points() > 0) {
+        std::vector<float> values(attr->num_components());
+        attr->GetValue(draco::AttributeValueIndex(0), values.data());
+      }
+    }
+  }
+
+  buffer.Init(reinterpret_cast<const char *>(data), size);
+  auto pc_status = decoder.DecodePointCloudFromBuffer(&buffer);
+  if (pc_status.ok()) {
+    auto pc = std::move(pc_status).value();
+    for (int i = 0; i < pc->num_attributes(); ++i) {
+      auto attr = pc->attribute(i);
+      if (attr && pc->num_points() > 0) {
+        std::vector<float> values(attr->num_components());
+        attr->GetValue(draco::AttributeValueIndex(0), values.data());
+      }
+    }
+  }
+
+  return 0;
+}

projects/draco/project.yaml

@@ -1,12 +1,3 @@
 homepage: "https://github.com/google/draco"
+main_repo: "https://github.com/google/draco"
 language: c++
-primary_contact: "fgalligan@google.com"
-auto_ccs:
-  - "ostava@google.com"
-  - "vytyaz@google.com"
-fuzzing_engines:
-  - libfuzzer
-  - honggfuzz
-  - centipede
-main_repo: 'https://github.com/google/draco'
-file_github_issue: True