Do hash-based verification of disc images

src/dusk/iso_validate.cpp

@@ -1,8 +1,8 @@
 #include "iso_validate.hpp"
 
 #include <nod.h>
-
-#include "SDL3/SDL_iostream.h"
+#include <SDL3/SDL_iostream.h>
+#include <stdexcept>
 
 namespace {
 
@@ -147,7 +147,7 @@ ValidationError verify_disc(NodHandle* disc, VerificationStatus& status) {
     const auto hashState = XXH3_createState();
     XXH3_128bits_reset(hashState);
 
-    while (!status.shouldCancel) {
+    while (true) {
         size_t bytesAvail;
         const auto buf = nod_buf_read(disc, &bytesAvail);
         if (!bytesAvail)
@@ -159,13 +159,9 @@ ValidationError verify_disc(NodHandle* disc, VerificationStatus& status) {
         nod_buf_consume(disc, bytesAvail);
     }
 
-    if (status.shouldCancel) {
-        return ValidationError::Cancelled;
-    }
-
     const auto hash = XXH3_128bits_digest(hashState);
     if (!XXH128_isEqual(hash, status.knownDisc->hash)) {
-        return ValidationError::DiscHashMismatch;
+        return ValidationError::HashMismatch;
     }
 
     return ValidationError::Success;
@@ -214,6 +210,11 @@ ValidationError validate(const char* path, VerificationStatus& status) {
     return verify_disc(disc.handle, status);
 }
 
+ValidationError validate(const char* path) {
+    VerificationStatus status{};
+    return validate(path, status);
+}
+
 bool isPal(const char* path) {
     NodHandleWrapper disc;
 

src/dusk/iso_validate.hpp

@@ -7,14 +7,13 @@ namespace dusk::iso {
     struct KnownDisc;
 
     enum class ValidationError : u8 {
-        Success = 0,
+        Unknown = 0,
         IOError,
         InvalidImage,
         WrongGame,
         WrongVersion,
-        Cancelled,
-        DiscHashMismatch,
-        Unknown
+        HashMismatch,
+        Success
     };
 
     struct VerificationStatus {
@@ -25,6 +24,7 @@ namespace dusk::iso {
     };
 
     ValidationError validate(const char* path, VerificationStatus& status);
+    ValidationError validate(const char* path);
     bool isPal(const char* path);
 }
 

src/dusk/ui/prelaunch.cpp

@@ -56,6 +56,8 @@ constexpr std::array<SDL_DialogFileFilter, 2> kDiscFileFilters{{
 
 static std::string get_error_msg(iso::ValidationError error) {
     switch (error) {
+    default:
+        return "The selected disc image could not be validated.";
     case iso::ValidationError::IOError:
         return "Unable to read the selected file.";
     case iso::ValidationError::InvalidImage:
@@ -64,22 +66,19 @@ static std::string get_error_msg(iso::ValidationError error) {
         return "The selected game is not supported by Dusk.";
     case iso::ValidationError::WrongVersion:
         return "Dusk currently supports GameCube USA and PAL disc images only.";
+    case iso::ValidationError::HashMismatch:
+        return "The selected disc image did not pass hash verification, it may be corrupt or modified.";
     case iso::ValidationError::Success:
         return "The selected disc image is valid.";
-    default:
-        return "The selected disc image could not be validated.";
     }
 }
 
 void file_dialog_callback(void*, const char* path, const char* error) {
-    auto& state = prelaunch_state();
-    if (error != nullptr) {
-        return;
-    }
-    if (path == nullptr) {
+    if (path == nullptr || error != nullptr) {
         return;
     }
 
+    auto& state = prelaunch_state();
     const auto validation = iso::validate(path);
     if (validation != iso::ValidationError::Success) {
         state.errorString = escape(get_error_msg(validation));