Merge pull request #162 from Syndica/ink/guarantee-layouts

fix(core,accountsdb): Guarantee the layout of some struct types

src/accountsdb/accounts_file.zig

@@ -45,14 +45,14 @@ pub const AccountInFile = struct {
     len: usize = 0,
 
     /// info about the account stored
-    pub const StorageInfo = struct {
+    pub const StorageInfo = extern struct {
         write_version_obsolete: u64,
         data_len: u64,
         pubkey: Pubkey,
     };
 
     /// on-chain account info about the account
-    pub const AccountInfo = struct {
+    pub const AccountInfo = extern struct {
         lamports: u64,
         rent_epoch: Epoch,
         owner: Pubkey,

src/core/pubkey.zig

@@ -4,7 +4,7 @@ const Ed25519 = std.crypto.sign.Ed25519;
 const encoder = base58.Encoder.init(.{});
 const decoder = base58.Decoder.init(.{});
 
-pub const Pubkey = struct {
+pub const Pubkey = extern struct {
     data: [32]u8,
 
     const Self = @This();