Atmosphere/libraries/libstratosphere/source/updater/updater_files.cpp

68 lines
2.1 KiB
C++

/*
* Copyright (c) 2018-2020 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "updater_files.hpp"
namespace ams::updater {
Result ReadFile(size_t *out_size, void *dst, size_t dst_size, const char *path) {
FILE *fp = fopen(path, "rb");
if (fp == NULL) {
return ResultInvalidBootImagePackage();
}
ON_SCOPE_EXIT { fclose(fp); };
std::memset(dst, 0, dst_size);
size_t read_size = fread(dst, 1, dst_size, fp);
if (ferror(fp)) {
return fsdevGetLastResult();
}
*out_size = read_size;
return ResultSuccess();
}
Result GetFileHash(size_t *out_size, void *dst_hash, const char *path, void *work_buffer, size_t work_buffer_size) {
FILE *fp = fopen(path, "rb");
if (fp == NULL) {
return ResultInvalidBootImagePackage();
}
ON_SCOPE_EXIT { fclose(fp); };
Sha256Context sha_ctx;
sha256ContextCreate(&sha_ctx);
size_t total_size = 0;
while (true) {
size_t read_size = fread(work_buffer, 1, work_buffer_size, fp);
if (ferror(fp)) {
return fsdevGetLastResult();
}
if (read_size == 0) {
break;
}
sha256ContextUpdate(&sha_ctx, work_buffer, read_size);
total_size += read_size;
if (read_size != work_buffer_size) {
break;
}
}
sha256ContextGetHash(&sha_ctx, dst_hash);
*out_size = total_size;
return ResultSuccess();
}
}