support base85 encoding/decoding

PiperOrigin-RevId: 725692677

internal/encoding/BUILD

@@ -0,0 +1,39 @@
+# Copyright 2025 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
+#
+#     https://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.
+
+licenses(["notice"])
+
+package(default_visibility = ["//:__subpackages__"])
+
+cc_library(
+    name = "base85",
+    srcs = ["base85.cc"],
+    hdrs = ["base85.h"],
+    compatible_with = ["//buildenv/target:non_prod"],
+    deps = [
+        "@com_google_absl//absl/strings",
+        "@com_google_absl//absl/strings:string_view",
+    ],
+)
+
+cc_test(
+    name = "base85_test",
+    srcs = ["base85_test.cc"],
+    deps = [
+        ":base85",
+        "@com_github_protobuf_matchers//protobuf-matchers",
+        "@com_google_absl//absl/strings",
+        "@com_google_googletest//:gtest_main",
+    ],
+)