[memfile] Add support for faking files in memory

src/main/sdvxhook2/config-io.c

@@ -9,11 +9,13 @@
 #define SDVXHOOK2_CONFIG_IO_DISABLE_BIO2_EMU_KEY "io.disable_bio2_emu"
 #define SDVXHOOK2_CONFIG_IO_DISABLE_POLL_LIMITER_KEY "io.disable_poll_limiter"
 #define SDVXHOOK2_CONFIG_IO_FORCE_HEADPHONES_KEY "io.force_headphones"
+#define SDVXHOOK2_CONFIG_IO_DISABLE_FILE_HOOKS_KEY "io.disable_file_hooks"
 
 #define SDVXHOOK2_CONFIG_IO_DEFAULT_DISABLE_CARD_READER_EMU_VALUE false
 #define SDVXHOOK2_CONFIG_IO_DEFAULT_DISABLE_BIO2_EMU_VALUE false
 #define SDVXHOOK2_CONFIG_IO_DEFAULT_DISABLE_POLL_LIMITER_VALUE false
 #define SDVXHOOK2_CONFIG_IO_DEFAULT_FORCE_HEADPHONES_VALUE false
+#define SDVXHOOK2_CONFIG_IO_DEFAULT_DISABLE_FILE_HOOKS_VALUE false
 
 void sdvxhook2_config_io_init(struct cconfig *config)
 {
@@ -41,6 +43,12 @@ void sdvxhook2_config_io_init(struct cconfig *config)
         SDVXHOOK2_CONFIG_IO_FORCE_HEADPHONES_KEY,
         SDVXHOOK2_CONFIG_IO_DEFAULT_FORCE_HEADPHONES_VALUE,
         "Forces game to think headphones are attached");
+
+    cconfig_util_set_bool(
+        config,
+        SDVXHOOK2_CONFIG_IO_DISABLE_FILE_HOOKS_KEY,
+        SDVXHOOK2_CONFIG_IO_DEFAULT_DISABLE_FILE_HOOKS_VALUE,
+        "Disables the built in file hooks, requiring manual file creation (/dev/raw/j.dest)");
 }
 
 void sdvxhook2_config_io_get(
@@ -93,4 +101,16 @@ void sdvxhook2_config_io_get(
             SDVXHOOK2_CONFIG_IO_FORCE_HEADPHONES_KEY,
             SDVXHOOK2_CONFIG_IO_DEFAULT_FORCE_HEADPHONES_VALUE);
     }
+
+    if (!cconfig_util_get_bool(
+            config,
+            SDVXHOOK2_CONFIG_IO_DISABLE_FILE_HOOKS_KEY,
+            &config_io->disable_file_hooks,
+            SDVXHOOK2_CONFIG_IO_DEFAULT_DISABLE_FILE_HOOKS_VALUE)) {
+        log_warning(
+            "Invalid value for key '%s' specified, fallback "
+            "to default '%d'",
+            SDVXHOOK2_CONFIG_IO_DISABLE_FILE_HOOKS_KEY,
+            SDVXHOOK2_CONFIG_IO_DEFAULT_DISABLE_FILE_HOOKS_VALUE);
+    }
 }

src/main/sdvxhook2/config-io.h

@@ -10,6 +10,7 @@ struct sdvxhook2_config_io {
     bool disable_bio2_emu;
     bool disable_poll_limiter;
     bool force_headphones;
+    bool disable_file_hooks;
 };
 
 void sdvxhook2_config_io_init(struct cconfig *config);

src/main/sdvxhook2/dllmain.c

@@ -14,6 +14,7 @@
 #include "hooklib/adapter.h"
 #include "hooklib/app.h"
 #include "hooklib/config-adapter.h"
+#include "hooklib/memfile.h"
 #include "hooklib/rs232.h"
 
 #include "bio2emu/emu.h"
@@ -51,6 +52,21 @@ static struct bio2emu_port bio2_emu = {
     .dispatcher = bio2_emu_bi2a_dispatch_request,
 };
 
+static void attach_dest_fd_intercept(const char *sidcode)
+{
+    char region = sidcode[3];
+
+    if (region == 'X') {
+        region = 'J';
+    }
+
+    char target_file[8] = "\\x.dest";
+    target_file[1] = tolower(region);
+
+    // can only capture these by ending path due to /dev/raw being mountable
+    memfile_hook_add_fd(target_file, ENDING_MATCH, NULL, 0);
+}
+
 static bool my_dll_entry_init(char *sidcode, struct property_node *param)
 {
     struct cconfig *config;
@@ -113,12 +129,21 @@ static bool my_dll_entry_init(char *sidcode, struct property_node *param)
     iohook_push_handler(ac_io_port_dispatch_irp);
     iohook_push_handler(bio2emu_port_dispatch_irp);
 
+    if (!config_io.disable_file_hooks) {
+        memfile_hook_init();
+        iohook_push_handler(memfile_hook_dispatch_irp);
+        attach_dest_fd_intercept(sidcode);
+    }
+
     rs232_hook_init();
     rs232_hook_limit_hooks();
 
     if (!config_io.disable_bio2_emu) {
         bio2emu_init();
-        bio2_emu_bi2a_init(&bio2_emu, config_io.disable_poll_limiter, config_io.force_headphones);
+        bio2_emu_bi2a_init(
+            &bio2_emu,
+            config_io.disable_poll_limiter,
+            config_io.force_headphones);
     }
 
     if (!config_io.disable_card_reader_emu) {
@@ -157,6 +182,10 @@ static bool my_dll_entry_main(void)
         sdvx_io_fini();
     }
 
+    if (!config_io.disable_file_hooks) {
+        memfile_hook_fini();
+    }
+
     return result;
 }