Kyle Bayes
d3d789cf7d
PiperOrigin-RevId: 515431052 Change-Id: I440de0cb417ce216b6d636a5d86dc9ef6cc1fc06
81 lines
2.2 KiB
C
81 lines
2.2 KiB
C
// Copyright 2022 DeepMind Technologies Limited
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "engine/engine_file.h"
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#include <stdio.h>
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#include <limits.h>
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#include "engine/engine_util_errmem.h"
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void* mju_fileToMemory(const char* filename, int* filesize) {
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// open file
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*filesize = 0;
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FILE* fp = fopen(filename, "rb");
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if (!fp) {
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return NULL;
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}
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// find size
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if (fseek(fp, 0, SEEK_END) != 0) {
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fclose(fp);
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mju_warning("Failed to calculate size for '%s'", filename);
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return NULL;
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}
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// ensure file size fits in int
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long long_filesize = ftell(fp); // NOLINT(runtime/int)
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if (long_filesize > INT_MAX) {
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fclose(fp);
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mju_warning("File size over 2GB is not supported. File: '%s'", filename);
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return NULL;
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} else if (long_filesize < 0) {
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fclose(fp);
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mju_warning("Failed to calculate size for '%s'", filename);
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return NULL;
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}
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*filesize = long_filesize;
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// go back to start of file
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if (fseek(fp, 0, SEEK_SET) != 0) {
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fclose(fp);
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mju_warning("Read error while reading '%s'", filename);
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return NULL;
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}
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// allocate and read
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void* buffer = mju_malloc(*filesize);
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if (!buffer) {
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mju_error("mjFileToMemory: could not allocate memory");
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}
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size_t bytes_read = fread(buffer, 1, *filesize, fp);
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// check that read data matches file size
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if (bytes_read != *filesize) { // SHOULD NOT OCCUR
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if (ferror(fp)) {
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fclose(fp);
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mju_free(buffer);
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*filesize = 0;
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mju_warning("Read error while reading '%s'", filename);
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return NULL;
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} else if (feof(fp)) {
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*filesize = bytes_read;
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}
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}
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// close file, return contents
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fclose(fp);
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return buffer;
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}
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