mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
synced 2024-11-23 12:22:08 +00:00
217 lines
7.7 KiB
C++
217 lines
7.7 KiB
C++
/*
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* Copyright (c) 2018-2019 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stratosphere/cfg.hpp>
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#include "ldr_capabilities.hpp"
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#include "ldr_content_management.hpp"
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#include "ldr_meta.hpp"
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namespace sts::ldr {
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namespace {
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/* Convenience definitions. */
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constexpr size_t MetaCacheBufferSize = 0x8000;
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constexpr const char *MetaFilePath = "/main.npdm";
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/* Types. */
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struct MetaCache {
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Meta meta;
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u8 buffer[MetaCacheBufferSize];
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};
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/* Global storage. */
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ncm::TitleId g_cached_title_id;
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MetaCache g_meta_cache;
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MetaCache g_original_meta_cache;
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/* Helpers. */
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Result ValidateSubregion(size_t allowed_start, size_t allowed_end, size_t start, size_t size, size_t min_size = 0) {
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if (!(size >= min_size && allowed_start <= start && start <= allowed_end && start + size <= allowed_end)) {
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return ResultLoaderInvalidMeta;
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}
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return ResultSuccess;
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}
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Result ValidateNpdm(const Npdm *npdm, size_t size) {
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/* Validate magic. */
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if (npdm->magic != Npdm::Magic) {
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return ResultLoaderInvalidMeta;
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}
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/* Validate flags. */
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if (hos::GetVersion() >= hos::Version_700) {
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/* 7.0.0 added 0x10 as a valid bit to NPDM flags. */
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if (npdm->flags & ~0x1F) {
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return ResultLoaderInvalidMeta;
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}
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} else {
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if (npdm->flags & ~0xF) {
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return ResultLoaderInvalidMeta;
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}
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}
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/* Validate Acid extents. */
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R_TRY(ValidateSubregion(sizeof(Npdm), size, npdm->acid_offset, npdm->acid_size, sizeof(Acid)));
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/* Validate Aci extends. */
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R_TRY(ValidateSubregion(sizeof(Npdm), size, npdm->aci_offset, npdm->aci_size, sizeof(Aci)));
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return ResultSuccess;
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}
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Result ValidateAcid(const Acid *acid, size_t size) {
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/* Validate magic. */
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if (acid->magic != Acid::Magic) {
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return ResultLoaderInvalidMeta;
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}
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/* TODO: Check if retail flag is set if not development hardware. */
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/* Validate Fac, Sac, Kac. */
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R_TRY(ValidateSubregion(sizeof(Acid), size, acid->fac_offset, acid->fac_size));
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R_TRY(ValidateSubregion(sizeof(Acid), size, acid->sac_offset, acid->sac_size));
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R_TRY(ValidateSubregion(sizeof(Acid), size, acid->kac_offset, acid->kac_size));
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return ResultSuccess;
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}
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Result ValidateAci(const Aci *aci, size_t size) {
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/* Validate magic. */
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if (aci->magic != Aci::Magic) {
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return ResultLoaderInvalidMeta;
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}
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/* Validate Fah, Sac, Kac. */
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R_TRY(ValidateSubregion(sizeof(Aci), size, aci->fah_offset, aci->fah_size));
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R_TRY(ValidateSubregion(sizeof(Aci), size, aci->sac_offset, aci->sac_size));
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R_TRY(ValidateSubregion(sizeof(Aci), size, aci->kac_offset, aci->kac_size));
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return ResultSuccess;
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}
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Result LoadMetaFromFile(FILE *f, MetaCache *cache) {
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/* Reset cache. */
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cache->meta = {};
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/* Read from file. */
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size_t npdm_size = 0;
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{
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/* Get file size. */
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fseek(f, 0, SEEK_END);
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npdm_size = ftell(f);
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fseek(f, 0, SEEK_SET);
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/* Read data into cache buffer. */
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if (npdm_size > MetaCacheBufferSize || fread(cache->buffer, npdm_size, 1, f) != 1) {
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return ResultLoaderTooLargeMeta;
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}
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}
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/* Ensure size is big enough. */
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if (npdm_size < sizeof(Npdm)) {
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return ResultLoaderInvalidMeta;
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}
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/* Validate the meta. */
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{
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Meta *meta = &cache->meta;
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Npdm *npdm = reinterpret_cast<Npdm *>(cache->buffer);
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R_TRY(ValidateNpdm(npdm, npdm_size));
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Acid *acid = reinterpret_cast<Acid *>(cache->buffer + npdm->acid_offset);
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Aci *aci = reinterpret_cast<Aci *>(cache->buffer + npdm->aci_offset);
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R_TRY(ValidateAcid(acid, npdm->acid_size));
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R_TRY(ValidateAci(aci, npdm->aci_size));
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/* Set Meta members. */
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meta->npdm = npdm;
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meta->acid = acid;
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meta->aci = aci;
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meta->acid_fac = reinterpret_cast<u8 *>(acid) + acid->fac_offset;
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meta->acid_sac = reinterpret_cast<u8 *>(acid) + acid->sac_offset;
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meta->acid_kac = reinterpret_cast<u8 *>(acid) + acid->kac_offset;
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meta->aci_fah = reinterpret_cast<u8 *>(aci) + aci->fah_offset;
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meta->aci_sac = reinterpret_cast<u8 *>(aci) + aci->sac_offset;
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meta->aci_kac = reinterpret_cast<u8 *>(aci) + aci->kac_offset;
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}
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return ResultSuccess;
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}
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}
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/* API. */
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Result LoadMeta(Meta *out_meta, ncm::TitleId title_id) {
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FILE *f = nullptr;
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/* Try to load meta from file. */
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R_TRY(OpenCodeFile(f, title_id, MetaFilePath));
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{
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ON_SCOPE_EXIT { fclose(f); };
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R_TRY(LoadMetaFromFile(f, &g_meta_cache));
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}
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/* Patch meta. Start by setting all title ids to the current title id. */
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Meta *meta = &g_meta_cache.meta;
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meta->acid->title_id_min = title_id;
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meta->acid->title_id_max = title_id;
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meta->aci->title_id = title_id;
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/* For HBL, we need to copy some information from the base meta. */
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if (cfg::IsHblOverrideKeyHeld(title_id)) {
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if (R_SUCCEEDED(OpenCodeFileFromBaseExefs(f, title_id, MetaFilePath))) {
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ON_SCOPE_EXIT { fclose(f); };
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if (R_SUCCEEDED(LoadMetaFromFile(f, &g_original_meta_cache))) {
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Meta *o_meta = &g_original_meta_cache.meta;
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/* Fix pool partition. */
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if (hos::GetVersion() >= hos::Version_500) {
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meta->acid->flags = (meta->acid->flags & 0xFFFFFFC3) | (o_meta->acid->flags & 0x0000003C);
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}
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/* Fix flags. */
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const u16 program_info_flags = caps::GetProgramInfoFlags(o_meta->aci_kac, o_meta->aci->kac_size);
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caps::SetProgramInfoFlags(program_info_flags, meta->acid_kac, meta->acid->kac_size);
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caps::SetProgramInfoFlags(program_info_flags, meta->aci_kac, meta->aci->kac_size);
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}
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}
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}
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/* Set output. */
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g_cached_title_id = title_id;
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*out_meta = *meta;
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return ResultSuccess;
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}
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Result LoadMetaFromCache(Meta *out_meta, ncm::TitleId title_id) {
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if (g_cached_title_id != title_id) {
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return LoadMeta(out_meta, title_id);
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}
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*out_meta = g_meta_cache.meta;
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return ResultSuccess;
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}
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void InvalidateMetaCache() {
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/* Set the cached title id back to zero. */
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g_cached_title_id = {};
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}
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}
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