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Ensures safe Megacart cartridge sizes too.

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This commit is contained in:
Thomas Harte 2018-10-18 21:09:05 -04:00
parent 34e13d0d4d
commit 6a2db52adb
1 changed files with 8 additions and 0 deletions
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8
Machines/ColecoVision/ColecoVision.cpp
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@ -141,11 +141,19 @@ class ConcreteMachine:
cartridge_address_limit_ = static_cast<uint16_t>(0x8000 + cartridge_.size() - 1);
if(cartridge_.size() > 32768) {
// Ensure the cartrige is a multiple of 16kb in size, as that won't
// be checked when paging.
const size_t extension = (16384 - cartridge_.size() & 16383) % 16384;
cartridge_.resize(cartridge_.size() + extension);
cartridge_pages_[0] = &cartridge_[cartridge_.size() - 16384];
cartridge_pages_[1] = cartridge_.data();
is_megacart_ = true;
} else {
// Ensure at least 32kb is allocated to the cartrige so that
// reads are never out of bounds.
cartridge_.resize(32768);
cartridge_pages_[0] = cartridge_.data();
cartridge_pages_[1] = cartridge_.data() + 16384;
is_megacart_ = false;