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Achievements: Mirror whacky rcheevos header handling

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Stenzek 2024-09-29 20:38:46 +10:00
parent 6dc4fa5c75
commit 07f410bc6a
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1 changed files with 6 additions and 5 deletions
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11
src/core/achievements.cpp
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@ -290,15 +290,16 @@ std::string Achievements::GetGameHash(CDImage* image)
return {};
}
// See rcheevos hash.c - rc_hash_psx().
const u32 MAX_HASH_SIZE = 64 * 1024 * 1024;
const u32 hash_size =
std::min(std::min<u32>(sizeof(header) + header.file_size, MAX_HASH_SIZE), static_cast<u32>(executable_data.size()));
// This is absolutely bonkers silly. Someone decided to hash the file size specified in the executable, plus 2048,
// instead of adding the size of the header. It _should_ be "header.file_size + sizeof(header)". But we have to hack
// around it because who knows how many games are affected by this.
// https://github.com/RetroAchievements/rcheevos/blob/b8dd5747a4ed38f556fd776e6f41b131ea16178f/src/rhash/hash.c#L2824
const u32 hash_size = std::min(header.file_size + 2048, static_cast<u32>(executable_data.size()));
MD5Digest digest;
digest.Update(executable_name.c_str(), static_cast<u32>(executable_name.size()));
if (hash_size > 0)
digest.Update(executable_data);
digest.Update(executable_data.data(), hash_size);
u8 hash[16];
digest.Final(hash);