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// Copyright 2022 gRPC authors.
//
// 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.
#include <grpc/support/port_platform.h>
#include "src/core/lib/gprpp/load_file.h"
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include "y_absl/cleanup/cleanup.h"
#include "y_absl/status/status.h"
#include "y_absl/strings/str_cat.h"
#include <grpc/slice.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
namespace grpc_core {
// Loads the content of a file into a slice. add_null_terminator will add a NULL
// terminator if true.
y_absl::StatusOr<Slice> LoadFile(TString filename, bool add_null_terminator) {
unsigned char* contents = nullptr;
size_t contents_size = 0;
FILE* file;
size_t bytes_read = 0;
y_absl::Status error = y_absl::OkStatus();
auto sock_cleanup = y_absl::MakeCleanup([&file]() -> void {
if (file != nullptr) {
fclose(file);
}
});
file = fopen(filename.c_str(), "rb");
if (file == nullptr) {
error = y_absl::InternalError(
y_absl::StrCat("Failed to load file: ", filename,
" due to error(fdopen): ", strerror(errno)));
return error;
}
fseek(file, 0, SEEK_END);
// Converting to size_t on the assumption that it will not fail.
contents_size = static_cast<size_t>(ftell(file));
fseek(file, 0, SEEK_SET);
contents = static_cast<unsigned char*>(
gpr_malloc(contents_size + (add_null_terminator ? 1 : 0)));
bytes_read = fread(contents, 1, contents_size, file);
if (bytes_read < contents_size) {
gpr_free(contents);
GPR_ASSERT(ferror(file));
error = y_absl::InternalError(
y_absl::StrCat("Failed to load file: ", filename,
" due to error(fread): ", strerror(errno)));
return error;
}
if (add_null_terminator) {
contents[contents_size++] = 0;
}
return Slice(grpc_slice_new(contents, contents_size, gpr_free));
}
} // namespace grpc_core
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