implement save file decryption/encryption

src/Episode3/DataIndex.cc

@@ -10,6 +10,7 @@
 
 #include "../Loggers.hh"
 #include "../Compression.hh"
+#include "../PSOEncryption.hh"
 #include "../Text.hh"
 #include "../Quest.hh"
 
@@ -1712,4 +1713,33 @@ shared_ptr<const COMDeckDefinition> DataIndex::random_com_deck() const {
 
 
 
+void PlayerConfig::decrypt() {
+  if (!this->is_encrypted) {
+    return;
+  }
+  decrypt_trivial_gci_data(
+      &this->card_counts,
+      offsetof(PlayerConfig, decks) - offsetof(PlayerConfig, card_counts),
+      this->basis);
+  this->is_encrypted = 0;
+  this->basis = 0;
+}
+
+void PlayerConfig::encrypt(uint8_t basis) {
+  if (this->is_encrypted) {
+    if (this->basis == basis) {
+      return;
+    }
+    this->decrypt();
+  }
+  decrypt_trivial_gci_data(
+      &this->card_counts,
+      offsetof(PlayerConfig, decks) - offsetof(PlayerConfig, card_counts),
+      basis);
+  this->is_encrypted = 1;
+  this->basis = basis;
+}
+
+
+
 } // namespace Episode3

src/Episode3/DataIndex.hh

@@ -582,8 +582,8 @@ struct DeckDefinition {
 } __attribute__((packed)); // 0x84 bytes in total
 
 struct PlayerConfig {
-  // The first offsets in the comments in this struct are relative to start of
-  // 61/98 command; the second are relative to the start of the
+  // The first offsets in the comments in this struct are relative to the start
+  // of the 61/98 command; the second are relative to the start of the
   // Ep3PlayerDataSegment structure in the reverse-engineering project.
   // TODO: Fill in the unknown fields here by looking around callsites of
   // get_player_data_segment
@@ -626,6 +626,9 @@ struct PlayerConfig {
   /* 299C:2120 */ ptext<char, 0x10> name;
   /* 29AC:2130 */ parray<uint8_t, 0xCC> unknown_a11;
   /* 2A78:21FC */
+
+  void decrypt();
+  void encrypt(uint8_t basis);
 } __attribute__((packed));
 
 enum class HPType : uint8_t {