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/*
*
* Copyright 2015 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/iomgr/load_file.h"
#include <errno.h>
#include <string.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/string_util.h>
#include "src/core/lib/gpr/string.h"
#include "src/core/lib/iomgr/block_annotate.h"
grpc_error* grpc_load_file(const char* filename, int add_null_terminator,
grpc_slice* output) {
unsigned char* contents = nullptr;
size_t contents_size = 0;
grpc_slice result = grpc_empty_slice();
FILE* file;
size_t bytes_read = 0;
grpc_error* error = GRPC_ERROR_NONE;
GRPC_SCHEDULING_START_BLOCKING_REGION;
file = fopen(filename, "rb");
if (file == nullptr) {
error = GRPC_OS_ERROR(errno, "fopen");
goto end;
}
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) {
error = GRPC_OS_ERROR(errno, "fread");
GPR_ASSERT(ferror(file));
goto end;
}
if (add_null_terminator) {
contents[contents_size++] = 0;
}
result = grpc_slice_new(contents, contents_size, gpr_free);
end:
*output = result;
if (file != nullptr) fclose(file);
if (error != GRPC_ERROR_NONE) {
grpc_error* error_out =
grpc_error_set_str(GRPC_ERROR_CREATE_REFERENCING_FROM_STATIC_STRING(
"Failed to load file", &error, 1),
GRPC_ERROR_STR_FILENAME,
grpc_slice_from_copied_string(
filename)); // TODO(ncteisen), always static?
GRPC_ERROR_UNREF(error);
error = error_out;
}
GRPC_SCHEDULING_END_BLOCKING_REGION_NO_EXEC_CTX;
return error;
}
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