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Change: store length of SL_STRUCTLIST in the savegame

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This wasn't consistently done, and often variables were used that
were read by an earlier blob. By moving it next to the struct
itself, the code becomes a bit more self-contained and easier to
read.

Additionally, this allows for external tooling to know how many
structs to expect, instead of having to know where to find the
length-field or a hard-coded value that can change at any moment.
This commit is contained in:
Patric Stout
2021-06-06 23:23:12 +02:00
committed by Patric Stout
parent d0bcb9839a
commit a146bcfe93
7 changed files with 156 additions and 42 deletions
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21
src/saveload/town_sl.cpp
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@@ -122,8 +122,21 @@ public:
SLE_CONDVAR(TransportedCargoStat<uint32>, new_act, SLE_UINT32, SLV_165, SL_MAX_VERSION),
};
/**
* Get the number of cargoes used by this savegame version.
* @return The number of cargoes used by this savegame version.
*/
size_t GetNumCargo() const
{
if (IsSavegameVersionBefore(SLV_EXTEND_CARGOTYPES)) return 32;
if (IsSavegameVersionBefore(SLV_SAVELOAD_LIST_LENGTH)) return NUM_CARGO;
/* Read from the savegame how long the list is. */
return SlGetStructListLength(NUM_CARGO);
}
void Save(Town *t) const override
{
SlSetStructListLength(NUM_CARGO);
for (CargoID i = 0; i < NUM_CARGO; i++) {
SlObject(&t->supplied[i], this->GetDescription());
}
@@ -131,7 +144,7 @@ public:
void Load(Town *t) const override
{
uint num_cargo = IsSavegameVersionBefore(SLV_EXTEND_CARGOTYPES) ? 32 : NUM_CARGO;
size_t num_cargo = this->GetNumCargo();
for (CargoID i = 0; i < num_cargo; i++) {
SlObject(&t->supplied[i], this->GetDescription());
}
@@ -149,14 +162,16 @@ public:
void Save(Town *t) const override
{
for (int i = TE_BEGIN; i < TE_END; i++) {
SlSetStructListLength(NUM_TE);
for (size_t i = TE_BEGIN; i < TE_END; i++) {
SlObject(&t->received[i], this->GetDescription());
}
}
void Load(Town *t) const override
{
for (int i = TE_BEGIN; i < TE_END; i++) {
size_t length = IsSavegameVersionBefore(SLV_SAVELOAD_LIST_LENGTH) ? (size_t)TE_END : SlGetStructListLength(TE_END);
for (size_t i = 0; i < length; i++) {
SlObject(&t->received[i], this->GetDescription());
}
}