1# Copyright 2018 Google LLC 2# 3# Licensed under the Apache License, Version 2.0 (the "License"); 4# you may not use this file except in compliance with the License. 5# You may obtain a copy of the License at 6# 7# https://www.apache.org/licenses/LICENSE-2.0 8# 9# Unless required by applicable law or agreed to in writing, software 10# distributed under the License is distributed on an "AS IS" BASIS, 11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12# See the License for the specific language governing permissions and 13# limitations under the License. 14 15""" 16Rule that allows to embed binary files into a C++ program. 17 18The result is exposed as an absl::string_view global variable. 19""" 20 21def cc_data_blob(name, src, varname): 22 native.genrule( 23 name = name + "_sources", 24 srcs = [src], 25 outs = [name + ".cc", name + ".h"], 26 cmd = "; ".join([ 27 "cat $< > $(@D)/datablob.tmp", 28 "pushd $(@D)", 29 "outname=%s" % name, 30 "echo 'namespace {' > $$outname.cc", 31 "xxd -i datablob.tmp >> $$outname.cc", 32 "echo '}' >> $$outname.cc", 33 "echo '#include \"absl/strings/string_view.h\"' >> $$outname.cc", 34 "echo 'absl::string_view %s(reinterpret_cast<const char*>(datablob_tmp), datablob_tmp_len);' >> $$outname.cc" % varname, 35 "echo '#include \"absl/strings/string_view.h\"' >> $$outname.h", 36 "echo 'extern absl::string_view %s;' >> $$outname.h" % varname, 37 "rm datablob.tmp", 38 "popd", 39 ]), 40 ) 41 native.cc_library( 42 name = name, 43 srcs = [name + ".cc"], 44 hdrs = [name + ".h"], 45 deps = ["@com_google_absl//absl/strings"], 46 ) 47