more frees and remove unused functions

lib/flutter_libsparkmobile.dart

@@ -407,12 +407,38 @@ abstract final class LibSpark {
       txHashPtr,
     );
 
-    // todo: more comprehensive frees
     malloc.free(privateKeyPtr);
     malloc.free(recipientsPtr);
+
+    for (int i = 0; i < privateRecipients.length; i++) {
+      malloc.free(privateRecipientsPtr[i].output.ref.memo);
+      malloc.free(privateRecipientsPtr[i].output.ref.address);
+      malloc.free(privateRecipientsPtr[i].output);
+    }
     malloc.free(privateRecipientsPtr);
+
+    for (int i = 0; i < serializedCoins.length; i++) {
+      malloc.free(serializedCoinsPtr[i].serializedCoinContext.ref.data);
+      malloc.free(serializedCoinsPtr[i].serializedCoinContext);
+      malloc.free(serializedCoinsPtr[i].serializedCoin.ref.data);
+      malloc.free(serializedCoinsPtr[i].serializedCoin);
+    }
     malloc.free(serializedCoinsPtr);
+
+    for (int i = 0; i < allAnonymitySets.length; i++) {
+      for (int j = 0; j < allAnonymitySets[i].set.length; j++) {
+        malloc.free(coverSetDataAllPtr[i].cover_set[j].data);
+      }
+      malloc.free(coverSetDataAllPtr[i].cover_set);
+      malloc.free(coverSetDataAllPtr[i].cover_set_representation);
+    }
     malloc.free(coverSetDataAllPtr);
+
+    for (int i = 0; i < idAndBlockHashes.length; i++) {
+      malloc.free(idAndBlockHashesPtr[i].hash);
+    }
+    malloc.free(idAndBlockHashesPtr);
+
     malloc.free(txHashPtr);
 
     if (result.address == nullptr.address) {
@@ -449,241 +475,6 @@ abstract final class LibSpark {
     );
   }
 
-  static ({int changeToMint, List<LibSparkCoin> coins}) getCoinsToSpend({
-    required int sendAmount,
-    required int recipientsToSubtractFee,
-    required List<LibSparkCoin> coins,
-    required int privateRecipientsCount,
-    required int recipientsCount,
-  }) {
-    final coinsPtr = malloc.allocate<CCSparkMintMeta>(
-      sizeOf<CCSparkMintMeta>() * coins.length,
-    );
-
-    for (int i = 0; i < coins.length; i++) {
-      coinsPtr[i].height = coins[i].height!;
-      coinsPtr[i].id = coins[i].id!;
-      coinsPtr[i].isUsed = coins[i].isUsed! ? 1 : 0;
-      coinsPtr[i].txid = coins[i].txHash!.unsignedCharPointer();
-      coinsPtr[i].i = coins[i].diversifier!.toInt();
-      coinsPtr[i].d = coins[i].encryptedDiversifier!.unsignedCharPointer();
-      coinsPtr[i].dLength = coins[i].encryptedDiversifier!.length;
-      coinsPtr[i].nonceHex = coins[i].nonceHex!.toNativeUtf8().cast<Char>();
-      coinsPtr[i].nonceHexLength = coins[i].nonceHex!.length;
-      coinsPtr[i].memo = coins[i].memo!.toNativeUtf8().cast<Char>();
-      coinsPtr[i].memoLength = coins[i].memo!.length;
-      coinsPtr[i].serial_context =
-          coins[i].serialContext!.unsignedCharPointer();
-      coinsPtr[i].serial_contextLength = coins[i].serialContext!.length;
-      coinsPtr[i].type = coins[i].type.value;
-
-      final serCoin = base64Decode(coins[i].serializedCoin!);
-      coinsPtr[i].serializedCoin = serCoin.unsignedCharPointer();
-      coinsPtr[i].serializedCoinLength = serCoin.length;
-    }
-
-    final result = _bindings.getCoinsToSpend(
-      sendAmount,
-      coinsPtr,
-      coins.length,
-    );
-
-    for (int i = 0; i < coins.length; i++) {
-      malloc.free(coinsPtr[i].txid);
-      malloc.free(coinsPtr[i].d);
-      malloc.free(coinsPtr[i].nonceHex);
-      malloc.free(coinsPtr[i].memo);
-      malloc.free(coinsPtr[i].serial_context);
-      malloc.free(coinsPtr[i].serializedCoin);
-    }
-    malloc.free(coinsPtr);
-
-    if (result.ref.errorMessageLength > 0) {
-      final ex = Exception(
-        result.ref.errorMessage.cast<Utf8>().toDartString(
-              length: result.ref.errorMessageLength,
-            ),
-      );
-      malloc.free(result.ref.errorMessage);
-      malloc.free(result);
-      throw ex;
-    }
-
-    final ({int changeToMint, List<LibSparkCoin> coins}) ret = (
-      changeToMint: result.ref.changeToMint,
-      coins: <LibSparkCoin>[],
-    );
-
-    for (int i = 0; i < result.ref.length; i++) {
-      final LibSparkCoinType coinType;
-      switch (result.ref.list[i].type) {
-        case 0:
-          coinType = LibSparkCoinType.mint;
-          break;
-        case 1:
-          coinType = LibSparkCoinType.mint;
-          break;
-        default:
-          throw Exception(
-            "Unknown coin type \"${result.ref.list[i].type}\" found.",
-          );
-      }
-
-      final coin = LibSparkCoin(
-        type: coinType,
-        id: result.ref.list[i].id,
-        height: result.ref.list[i].height,
-        isUsed: result.ref.list[i].isUsed > 0,
-        nonceHex: result.ref.list[i].nonceHex
-            .cast<Utf8>()
-            .toDartString(length: result.ref.list[i].nonceHexLength),
-        value: BigInt.from(result.ref.list[i].v),
-        memo: result.ref.list[i].memo
-            .cast<Utf8>()
-            .toDartString(length: result.ref.list[i].memoLength),
-        txHash: result.ref.list[i].txid.toUint8List(32),
-        serialContext: result.ref.list[i].serial_context
-            .toUint8List(result.ref.list[i].serial_contextLength),
-        diversifier: BigInt.from(result.ref.list[i].i),
-        encryptedDiversifier:
-            result.ref.list[i].d.toUint8List(result.ref.list[i].dLength),
-        serializedCoin: base64Encode(result.ref.list[i].serializedCoin
-            .toUint8List(result.ref.list[i].serializedCoinLength)),
-      );
-
-      ret.coins.add(coin);
-
-      malloc.free(result.ref.list[i].txid);
-      malloc.free(result.ref.list[i].d);
-      malloc.free(result.ref.list[i].nonceHex);
-      malloc.free(result.ref.list[i].memo);
-      malloc.free(result.ref.list[i].serial_context);
-      malloc.free(result.ref.list[i].serializedCoin);
-    }
-
-    malloc.free(result);
-
-    return ret;
-  }
-
-  static ({int fee, List<LibSparkCoin> coins}) selectSparkCoins({
-    required int requiredAmount,
-    required bool subtractFeeFromAmount,
-    required List<LibSparkCoin> coins,
-    required int privateRecipientsCount,
-  }) {
-    final coinsPtr = malloc.allocate<CCSparkMintMeta>(
-      sizeOf<CCSparkMintMeta>() * coins.length,
-    );
-
-    for (int i = 0; i < coins.length; i++) {
-      coinsPtr[i].height = coins[i].height!;
-      coinsPtr[i].id = coins[i].id!;
-      coinsPtr[i].isUsed = coins[i].isUsed! ? 1 : 0;
-      coinsPtr[i].txid = coins[i].txHash!.unsignedCharPointer();
-      coinsPtr[i].i = coins[i].diversifier!.toInt();
-      coinsPtr[i].d = coins[i].encryptedDiversifier!.unsignedCharPointer();
-      coinsPtr[i].dLength = coins[i].encryptedDiversifier!.length;
-      coinsPtr[i].nonceHex = coins[i].nonceHex!.toNativeUtf8().cast<Char>();
-      coinsPtr[i].nonceHexLength = coins[i].nonceHex!.length;
-      coinsPtr[i].memo = coins[i].memo!.toNativeUtf8().cast<Char>();
-      coinsPtr[i].memoLength = coins[i].memo!.length;
-      coinsPtr[i].serial_context =
-          coins[i].serialContext!.unsignedCharPointer();
-      coinsPtr[i].serial_contextLength = coins[i].serialContext!.length;
-      coinsPtr[i].type = coins[i].type.value;
-
-      final serCoin = base64Decode(coins[i].serializedCoin!);
-      coinsPtr[i].serializedCoin = serCoin.unsignedCharPointer();
-      coinsPtr[i].serializedCoinLength = serCoin.length;
-    }
-
-    final result = _bindings.selectSparkCoins(
-      requiredAmount,
-      subtractFeeFromAmount ? 1 : 0,
-      coinsPtr,
-      coins.length,
-      privateRecipientsCount,
-    );
-
-    for (int i = 0; i < coins.length; i++) {
-      malloc.free(coinsPtr[i].txid);
-      malloc.free(coinsPtr[i].d);
-      malloc.free(coinsPtr[i].nonceHex);
-      malloc.free(coinsPtr[i].memo);
-      malloc.free(coinsPtr[i].serial_context);
-      malloc.free(coinsPtr[i].serializedCoin);
-    }
-    malloc.free(coinsPtr);
-
-    if (result.ref.errorMessageLength > 0) {
-      final ex = Exception(
-        result.ref.errorMessage.cast<Utf8>().toDartString(
-              length: result.ref.errorMessageLength,
-            ),
-      );
-      malloc.free(result.ref.errorMessage);
-      malloc.free(result);
-      throw ex;
-    }
-
-    final ({int fee, List<LibSparkCoin> coins}) ret = (
-      fee: result.ref.fee,
-      coins: <LibSparkCoin>[],
-    );
-
-    for (int i = 0; i < result.ref.length; i++) {
-      final LibSparkCoinType coinType;
-      switch (result.ref.list[i].type) {
-        case 0:
-          coinType = LibSparkCoinType.mint;
-          break;
-        case 1:
-          coinType = LibSparkCoinType.mint;
-          break;
-        default:
-          throw Exception(
-            "Unknown coin type \"${result.ref.list[i].type}\" found.",
-          );
-      }
-
-      final coin = LibSparkCoin(
-        type: coinType,
-        id: result.ref.list[i].id,
-        height: result.ref.list[i].height,
-        isUsed: result.ref.list[i].isUsed > 0,
-        nonceHex: result.ref.list[i].nonceHex
-            .cast<Utf8>()
-            .toDartString(length: result.ref.list[i].nonceHexLength),
-        value: BigInt.from(result.ref.list[i].v),
-        memo: result.ref.list[i].memo
-            .cast<Utf8>()
-            .toDartString(length: result.ref.list[i].memoLength),
-        txHash: result.ref.list[i].txid.toUint8List(32),
-        serialContext: result.ref.list[i].serial_context
-            .toUint8List(result.ref.list[i].serial_contextLength),
-        diversifier: BigInt.from(result.ref.list[i].i),
-        encryptedDiversifier:
-            result.ref.list[i].d.toUint8List(result.ref.list[i].dLength),
-        serializedCoin: base64Encode(result.ref.list[i].serializedCoin
-            .toUint8List(result.ref.list[i].serializedCoinLength)),
-      );
-
-      ret.coins.add(coin);
-
-      malloc.free(result.ref.list[i].txid);
-      malloc.free(result.ref.list[i].d);
-      malloc.free(result.ref.list[i].nonceHex);
-      malloc.free(result.ref.list[i].memo);
-      malloc.free(result.ref.list[i].serial_context);
-      malloc.free(result.ref.list[i].serializedCoin);
-    }
-
-    malloc.free(result);
-
-    return ret;
-  }
-
   static bool validateAddress({
     required String address,
     required bool isTestNet,

lib/src/flutter_libsparkmobile_bindings_generated.dart

@@ -11,7 +11,7 @@ import 'dart:ffi' as ffi;
 ///
 /// Regenerate bindings with `flutter pub run ffigen --config ffigen.yaml`.
 ///
-class FlutterLibsparkmobileBindings {
+final class FlutterLibsparkmobileBindings {
   /// Holds the symbol lookup function.
   final ffi.Pointer<T> Function<T extends ffi.NativeType>(String symbolName)
       _lookup;
@@ -194,54 +194,6 @@ class FlutterLibsparkmobileBindings {
               int,
               ffi.Pointer<ffi.UnsignedChar>)>();
 
-  ffi.Pointer<GetSparkCoinsResult> getCoinsToSpend(
-    int spendAmount,
-    ffi.Pointer<CCSparkMintMeta> coins,
-    int coinLength,
-  ) {
-    return _getCoinsToSpend(
-      spendAmount,
-      coins,
-      coinLength,
-    );
-  }
-
-  late final _getCoinsToSpendPtr = _lookup<
-      ffi.NativeFunction<
-          ffi.Pointer<GetSparkCoinsResult> Function(ffi.Int64,
-              ffi.Pointer<CCSparkMintMeta>, ffi.Int)>>('getCoinsToSpend');
-  late final _getCoinsToSpend = _getCoinsToSpendPtr.asFunction<
-      ffi.Pointer<GetSparkCoinsResult> Function(
-          int, ffi.Pointer<CCSparkMintMeta>, int)>();
-
-  ffi.Pointer<SelectSparkCoinsResult> selectSparkCoins(
-    int required1,
-    int subtractFeeFromAmount,
-    ffi.Pointer<CCSparkMintMeta> coins,
-    int coinsLength,
-    int mintNum,
-  ) {
-    return _selectSparkCoins(
-      required1,
-      subtractFeeFromAmount,
-      coins,
-      coinsLength,
-      mintNum,
-    );
-  }
-
-  late final _selectSparkCoinsPtr = _lookup<
-      ffi.NativeFunction<
-          ffi.Pointer<SelectSparkCoinsResult> Function(
-              ffi.Int64,
-              ffi.Int,
-              ffi.Pointer<CCSparkMintMeta>,
-              ffi.Int,
-              ffi.Int)>>('selectSparkCoins');
-  late final _selectSparkCoins = _selectSparkCoinsPtr.asFunction<
-      ffi.Pointer<SelectSparkCoinsResult> Function(
-          int, int, ffi.Pointer<CCSparkMintMeta>, int, int)>();
-
   ffi.Pointer<SerializedMintContextResult> serializeMintContext(
     ffi.Pointer<DartInputData> inputs,
     int inputsLength,
@@ -547,36 +499,6 @@ final class CCSparkMintMeta extends ffi.Struct {
   external int serializedCoinLength;
 }
 
-final class GetSparkCoinsResult extends ffi.Struct {
-  external ffi.Pointer<CCSparkMintMeta> list;
-
-  @ffi.Int()
-  external int length;
-
-  @ffi.Int64()
-  external int changeToMint;
-
-  external ffi.Pointer<ffi.Char> errorMessage;
-
-  @ffi.Int()
-  external int errorMessageLength;
-}
-
-final class SelectSparkCoinsResult extends ffi.Struct {
-  external ffi.Pointer<CCSparkMintMeta> list;
-
-  @ffi.Int()
-  external int length;
-
-  @ffi.Int64()
-  external int fee;
-
-  external ffi.Pointer<ffi.Char> errorMessage;
-
-  @ffi.Int()
-  external int errorMessageLength;
-}
-
 /// FFI-friendly wrapper for a spark::CoverSetData.
 ///
 /// CoverSetData: https://github.com/firoorg/sparkmobile/blob/8bf17cd3deba6c3b0d10e89282e02936d7e71cdd/src/spend_transaction.h#L28

src/flutter_libsparkmobile.cpp

@@ -305,184 +305,6 @@ SparkSpendTransactionResult* cCreateSparkSpendTransaction(
     }
 }
 
-
-FFI_PLUGIN_EXPORT
-GetSparkCoinsResult* getCoinsToSpend(int64_t spendAmount, CCSparkMintMeta* coins, int coinsLength) {
-    try {
-        std::vector<CSparkMintMeta> coinsToSpend_out;
-        int64_t change;
-
-        std::list<CSparkMintMeta> _coins;
-
-        for (int i = 0; i < coinsLength; i++) {
-            CSparkMintMeta meta;
-            meta.nHeight = coins[i].height;
-            meta.nId = coins[i].id;
-            meta.isUsed = coins[i].isUsed > 0;
-            meta.txid = uint256S((const char*)coins[i].txid);
-            meta.i = coins[i].i;
-            meta.d = std::vector<unsigned char>(coins[i].d, coins[i].d + coins[i].dLength);
-            meta.v = coins[i].v;
-            Scalar k;
-            k.SetHex(std::string(coins[i].nonceHex, coins[i].nonceHexLength));
-            meta.k = k;
-            meta.memo = std::string(coins[i].memo, coins[i].memoLength);
-            meta.serial_context = std::vector<unsigned char>(coins[i].serial_context, coins[i].serial_context + coins[i].serial_contextLength);
-            meta.type = coins[i].type;
-            meta.coin = deserializeCoin(coins[i].serializedCoin, coins[i].serializedCoinLength);
-
-            _coins.push_back(meta);
-        }
-
-        CAmount _amount = spendAmount;
-        GetCoinsToSpend(_amount, coinsToSpend_out, _coins, change);
-
-        GetSparkCoinsResult* result = (GetSparkCoinsResult*)malloc(sizeof(GetSparkCoinsResult));
-        result->changeToMint = change;
-        result->length = coinsToSpend_out.size();
-        result->list = (CCSparkMintMeta*)malloc(sizeof(CCSparkMintMeta) * result->length);
-
-        for (int i = 0; i < coinsToSpend_out.size(); i++) {
-            result->list[i].height = coinsToSpend_out[i].nHeight;
-
-            result->list[i].id = coinsToSpend_out[i].nId;
-
-            result->list[i].isUsed = coinsToSpend_out[i].isUsed;
-
-            result->list[i].txid = (unsigned char*)malloc(sizeof(unsigned char*) * coinsToSpend_out[i].txid.size());
-            memcpy(result->list[i].txid, coinsToSpend_out[i].txid.begin(), sizeof(unsigned char) * coinsToSpend_out[i].txid.size());
-
-            result->list[i].i = coinsToSpend_out[i].i;
-
-            result->list[i].dLength = coinsToSpend_out[i].d.size();
-            result->list[i].d = (unsigned char*)malloc(sizeof(unsigned char) * coinsToSpend_out[i].d.size());
-            memcpy(result->list[i].d, coinsToSpend_out[i].d.data(), sizeof(unsigned char) * coinsToSpend_out[i].d.size());
-
-            result->list[i].v = coinsToSpend_out[i].v;
-
-            result->list[i].nonceHexLength = coinsToSpend_out[i].k.GetHex().length();
-            result->list[i].nonceHex = (char*)malloc(sizeof(char) * result->list[i].nonceHexLength);
-            memcpy(result->list[i].nonceHex, coinsToSpend_out[i].k.GetHex().c_str(), sizeof(char) * result->list[i].nonceHexLength);
-
-            result->list[i].memoLength = coinsToSpend_out[i].memo.length();
-            result->list[i].memo = (char*)malloc(sizeof(char) * result->list[i].memoLength);
-            memcpy(result->list[i].memo, coinsToSpend_out[i].memo.c_str(), sizeof(char) * result->list[i].memoLength);
-
-
-            result->list[i].serial_context = (unsigned char*)malloc(sizeof(unsigned char) * coinsToSpend_out[i].serial_context.size());
-            memcpy(result->list[i].serial_context, coinsToSpend_out[i].serial_context.data(), sizeof(unsigned char) * coinsToSpend_out[i].serial_context.size());
-            result->list[i].serial_contextLength = coinsToSpend_out[i].serial_context.size();
-
-            CDataStream coinStream(SER_NETWORK, PROTOCOL_VERSION);
-            coinStream << coinsToSpend_out[i].coin;
-            result->list[i].serializedCoinLength = coinStream.size();
-            result->list[i].serializedCoin = (unsigned char*)malloc(sizeof(unsigned char) * coinStream.size());
-            memcpy(result->list[i].serializedCoin, coinStream.data(), coinStream.size());
-
-            result->list[i].type = coinsToSpend_out[i].type;
-        }
-        result->errorMessageLength = 0; // false/no error
-        return result;
-    } catch (const std::exception& e) {
-        GetSparkCoinsResult *result = (GetSparkCoinsResult*)malloc(sizeof(GetSparkCoinsResult));
-        result->errorMessageLength = strlen(e.what());
-        result->errorMessage = (char*)malloc(sizeof(char) * result->errorMessageLength);
-        memcpy(result->errorMessage, e.what(), result->errorMessageLength);
-
-        return result;
-    }
-}
-
-FFI_PLUGIN_EXPORT
-SelectSparkCoinsResult* selectSparkCoins(
-        int64_t required,
-        int subtractFeeFromAmount,
-        CCSparkMintMeta* coins,
-        int coinsLength,
-        int mintNum
-) {
-    try {
-        std::list<CSparkMintMeta> _coins;
-        for (int i = 0; i < coinsLength; i++) {
-            for (int i = 0; i < coinsLength; i++) {
-                CSparkMintMeta meta;
-                meta.nHeight = coins[i].height;
-                meta.nId = coins[i].id;
-                meta.isUsed = coins[i].isUsed > 0;
-                meta.txid = uint256S((const char*)coins[i].txid);
-                meta.i = coins[i].i;
-                meta.d = std::vector<unsigned char>(coins[i].d, coins[i].d + coins[i].dLength);
-                meta.v = coins[i].v;
-                Scalar k;
-                k.SetHex(std::string(coins[i].nonceHex, coins[i].nonceHexLength));
-                meta.k = k;
-                meta.memo = std::string(coins[i].memo, coins[i].memoLength);
-                meta.serial_context = std::vector<unsigned char>(coins[i].serial_context, coins[i].serial_context + coins[i].serial_contextLength);
-                meta.type = coins[i].type;
-                meta.coin = deserializeCoin(coins[i].serializedCoin, coins[i].serializedCoinLength);
-
-                _coins.push_back(meta);
-            }
-        }
-
-        std::pair<CAmount, std::vector<CSparkMintMeta>> estimated = SelectSparkCoins(required, subtractFeeFromAmount > 0, _coins, mintNum);
-
-        SelectSparkCoinsResult* result = (SelectSparkCoinsResult*)malloc(sizeof(SelectSparkCoinsResult));
-        result->length = estimated.second.size();
-        result->fee = estimated.first;
-        result->list = (CCSparkMintMeta*)malloc(sizeof(CCSparkMintMeta) * result->length);
-
-        for (int i = 0; i < estimated.second.size(); i++) {
-            result->list[i].height = estimated.second[i].nHeight;
-
-            result->list[i].id = estimated.second[i].nId;
-
-            result->list[i].isUsed = estimated.second[i].isUsed;
-
-            result->list[i].txid = (unsigned char*)malloc(sizeof(unsigned char) * estimated.second[i].txid.size());
-            memcpy(result->list[i].txid, estimated.second[i].txid.begin(), sizeof(unsigned char) * estimated.second[i].txid.size());
-
-            result->list[i].i = estimated.second[i].i;
-
-            result->list[i].dLength = estimated.second[i].d.size();
-            result->list[i].d = (unsigned char*)malloc(sizeof(unsigned char) * estimated.second[i].d.size());
-            memcpy(result->list[i].d, estimated.second[i].d.data(), sizeof(unsigned char) * estimated.second[i].d.size());
-
-            result->list[i].v = estimated.second[i].v;
-
-            result->list[i].nonceHexLength = estimated.second[i].k.GetHex().length();
-            result->list[i].nonceHex = (char*)malloc(sizeof(char) * result->list[i].nonceHexLength);
-            memcpy(result->list[i].nonceHex, estimated.second[i].k.GetHex().c_str(), sizeof(char) * result->list[i].nonceHexLength);
-
-            result->list[i].memoLength = estimated.second[i].memo.length();
-            result->list[i].memo = (char*)malloc(sizeof(char) * result->list[i].memoLength);
-            memcpy(result->list[i].memo, estimated.second[i].memo.c_str(), sizeof(char) * result->list[i].memoLength);
-
-
-            result->list[i].serial_context = (unsigned char*)malloc(sizeof(unsigned char) * estimated.second[i].serial_context.size());
-            memcpy(result->list[i].serial_context, estimated.second[i].serial_context.data(), sizeof(unsigned char) * estimated.second[i].serial_context.size());
-            result->list[i].serial_contextLength = estimated.second[i].serial_context.size();
-
-            CDataStream coinStream(SER_NETWORK, PROTOCOL_VERSION);
-            coinStream << estimated.second[i].coin;
-            result->list[i].serializedCoinLength = coinStream.size();
-            result->list[i].serializedCoin = (unsigned char*)malloc(sizeof(unsigned char) * coinStream.size());
-            memcpy(result->list[i].serializedCoin, coinStream.data(), coinStream.size());
-
-            result->list[i].type = estimated.second[i].type;
-        }
-        result->errorMessageLength = 0; // false/no error
-        return result;
-    } catch (const std::exception& e) {
-        SelectSparkCoinsResult *result = (SelectSparkCoinsResult*)malloc(sizeof(SelectSparkCoinsResult));
-        result->errorMessageLength = strlen(e.what());
-        result->errorMessage = (char*)malloc(sizeof(char) * result->errorMessageLength);
-        memcpy(result->errorMessage, e.what(), result->errorMessageLength);
-
-        return result;
-    }
-}
-
 FFI_PLUGIN_EXPORT
 SerializedMintContextResult* serializeMintContext(
         DartInputData* inputs,

src/flutter_libsparkmobile.h

@@ -72,22 +72,6 @@ struct SparkSpendTransactionResult* cCreateSparkSpendTransaction(
         unsigned char* txHashSig
 );
 
-FFI_PLUGIN_EXPORT
-struct GetSparkCoinsResult* getCoinsToSpend(
-        int64_t spendAmount,
-        struct CCSparkMintMeta* coins,
-        int coinLength
-);
-
-FFI_PLUGIN_EXPORT
-struct SelectSparkCoinsResult* selectSparkCoins(
-        int64_t required,
-        int subtractFeeFromAmount,
-        struct CCSparkMintMeta* coins,
-        int coinsLength,
-        int mintNum
-);
-
 FFI_PLUGIN_EXPORT
 struct SerializedMintContextResult* serializeMintContext(
         struct DartInputData* inputs,

src/structs.h

@@ -141,26 +141,6 @@ struct CCSparkMintMeta {
     int serializedCoinLength;
 };
 
-struct GetSparkCoinsResult {
-    struct CCSparkMintMeta* list;
-    int length;
-
-    int64_t changeToMint;
-
-    char *errorMessage;
-    int errorMessageLength;
-};
-
-struct SelectSparkCoinsResult {
-    struct CCSparkMintMeta* list;
-    int length;
-
-    int64_t fee;
-
-    char *errorMessage;
-    int errorMessageLength;
-};
-
 /*
  * FFI-friendly wrapper for a spark::CoverSetData.
  *
@@ -175,8 +155,6 @@ struct CCoverSetData {
     int setId;
 };
 
-
-
 struct OutputScript {
     unsigned char *bytes;
     int length;