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Merge pull request #4867 from lioncash/simplify

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Boot_WiiWAD: Simplify state_checksum()
This commit is contained in:
Matthew Parlane 2017-03-07 18:27:50 +13:00 committed by GitHub
commit cfc909f422
1 changed files with 16 additions and 15 deletions
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31
Source/Core/Core/Boot/Boot_WiiWAD.cpp
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@ -2,7 +2,10 @@
// Licensed under GPLv2+
// Refer to the license.txt file included.
#include <array>
#include <cstddef>
#include <memory>
#include <numeric>
#include <string>
#include "Common/CommonPaths.h"
@ -20,19 +23,6 @@
#include "DiscIO/Volume.h"
#include "DiscIO/VolumeCreator.h"
static u32 state_checksum(u32* buf, int len)
{
u32 checksum = 0;
len = len >> 2;
for (int i = 0; i < len; i++)
{
checksum += buf[i];
}
return checksum;
}
struct StateFlags
{
u32 checksum;
@ -43,6 +33,17 @@ struct StateFlags
u32 unknown[6];
};
static u32 StateChecksum(const StateFlags& flags)
{
constexpr size_t length_in_bytes = sizeof(StateFlags) - 4;
constexpr size_t num_elements = length_in_bytes / sizeof(u32);
std::array<u32, num_elements> flag_data;
std::memcpy(flag_data.data(), &flags.flags, length_in_bytes);
return std::accumulate(flag_data.cbegin(), flag_data.cend(), 0U);
}
bool CBoot::Boot_WiiWAD(const std::string& _pFilename)
{
std::string state_filename(Common::GetTitleDataPath(TITLEID_SYSMENU, Common::FROM_SESSION_ROOT) +
@ -55,7 +56,7 @@ bool CBoot::Boot_WiiWAD(const std::string& _pFilename)
state_file.ReadBytes(&state, sizeof(StateFlags));
state.type = 0x03; // TYPE_RETURN
state.checksum = state_checksum((u32*)&state.flags, sizeof(StateFlags) - 4);
state.checksum = StateChecksum(state);
state_file.Seek(0, SEEK_SET);
state_file.WriteBytes(&state, sizeof(StateFlags));
@ -68,7 +69,7 @@ bool CBoot::Boot_WiiWAD(const std::string& _pFilename)
memset(&state, 0, sizeof(StateFlags));
state.type = 0x03; // TYPE_RETURN
state.discstate = 0x01; // DISCSTATE_WII
state.checksum = state_checksum((u32*)&state.flags, sizeof(StateFlags) - 4);
state.checksum = StateChecksum(state);
state_file.WriteBytes(&state, sizeof(StateFlags));
}