Add support for RETRO_ENVIRONMENT_SET_CONTENT_INFO_OVERRIDE API extension -...

Add support for RETRO_ENVIRONMENT_SET_CONTENT_INFO_OVERRIDE API extension - enables soft patching of non-CD content

libretro.cpp

@@ -28,7 +28,7 @@
 #define MEDNAFEN_CORE_NAME_MODULE "pce"
 #define MEDNAFEN_CORE_NAME "Beetle PCE"
 #define MEDNAFEN_CORE_VERSION "v0.9.48"
-#define MEDNAFEN_CORE_EXTENSIONS "pce|cue|ccd|chd|sgx"
+#define MEDNAFEN_CORE_EXTENSIONS "pce|sgx|cue|ccd|chd|toc|m3u"
 #define MEDNAFEN_CORE_TIMING_FPS 7159090.90909090 / 455.0 / 263.0
 #define MEDNAFEN_CORE_GEOMETRY_BASE_W 256
 #define MEDNAFEN_CORE_GEOMETRY_BASE_H 224
@@ -621,16 +621,23 @@ end:
 static std::vector<CDIF *> CDInterfaces;   // FIXME: Cleanup on error out.
 // TODO: LoadCommon()
 
-static bool MDFNI_LoadCD(const char *devicename)
+static bool MDFNI_LoadCD(const char *path, const char *ext)
 {
    bool ret = false;
-   log_cb(RETRO_LOG_INFO, "Loading %s...\n\n", devicename);
 
-   if(devicename && strlen(devicename) > 4 && !strcasecmp(devicename + strlen(devicename) - 4, ".m3u"))
+   if (!path || !ext)
+   {
+      log_cb(RETRO_LOG_ERROR, "Error opening CD - invalid path\n");
+      return false;
+   }
+
+   log_cb(RETRO_LOG_INFO, "Loading %s...\n\n", path);
+
+   if (!strcasecmp(ext, "m3u"))
    {
       std::vector<std::string> file_list;
 
-      ReadM3U(file_list, devicename);
+      ReadM3U(file_list, path);
 
       for(unsigned i = 0; i < file_list.size(); i++)
       {
@@ -640,7 +647,7 @@ static bool MDFNI_LoadCD(const char *devicename)
    }
    else
    {
-      CDIF *cdif = CDIF_Open(devicename, cdimagecache);
+      CDIF *cdif = CDIF_Open(path, cdimagecache);
 
       if (cdif)
       {
@@ -701,40 +708,63 @@ static bool MDFNI_LoadCD(const char *devicename)
    return true;
 }
 
-static bool MDFNI_LoadGame(const char *name)
+static bool MDFNI_LoadGame(const char *path, const char *ext,
+      const uint8_t *data, size_t size)
 {
-   MDFNFILE *GameFile = NULL;
-   MDFNGameInfo       = &EmulatedPCE;
+   MDFNFILE *GameFile          = NULL;
+   MDFNGameInfo                = &EmulatedPCE;
+   const uint8_t *content_data = NULL;
+   size_t content_size         = 0;
 
-   if(strlen(name) > 4 && (!strcasecmp(name + strlen(name) - 4, ".cue") || !strcasecmp(name + strlen(name) - 4, ".ccd") || !strcasecmp(name + strlen(name) - 4, ".chd") || !strcasecmp(name + strlen(name) - 4, ".toc") || !strcasecmp(name + strlen(name) - 4, ".m3u")))
-      return MDFNI_LoadCD(name);
+   if(ext &&
+      (!strcasecmp(ext, "cue") ||
+       !strcasecmp(ext, "ccd") ||
+       !strcasecmp(ext, "chd") ||
+       !strcasecmp(ext, "toc") ||
+       !strcasecmp(ext, "m3u")))
+      return MDFNI_LoadCD(path, ext);
 
-   MDFN_printf("Loading %s...\n",name);
+   MDFN_printf("Loading %s...\n", path ? path : "content");
 
    MDFN_indent(1);
 
-   // Construct a NULL-delimited list of known file extensions for MDFN_fopen()
-   GameFile = file_open(name);
+   /* Check whether we already have a valid
+    * data buffer */
+   if (data)
+   {
+      content_data = data;
+      content_size = size;
+   }
+   else
+   {
+      if (!path)
+      {
+         log_cb(RETRO_LOG_ERROR, "Error loading content - invalid path\n");
+         goto error;
+      }
+
+      /* Load content from file */
+      GameFile = file_open(path);
 
-   if(!GameFile)
-      goto error;
+      if(!GameFile)
+         goto error;
+
+      content_data = GameFile->data;
+      content_size = GameFile->size;
+   }
 
    MDFN_printf("Using module: pce.\n\n");
    MDFN_indent(1);
 
-   //
-   // Load per-game settings
-   //
-   // Maybe we should make a "pgcfg" subdir, and automatically load all files in it?
-   // End load per-game settings
-   //
-
-   if(PCE_Load(GameFile) <= 0)
+   if(PCE_Load(content_data, content_size, ext) <= 0)
       goto error;
 
    MDFN_LoadGameCheats(NULL);
    MDFNMP_InstallReadPatches();
 
+   if (GameFile)
+      file_close(GameFile);
+
    MDFN_indent(-2);
 
    return true;
@@ -1336,14 +1366,57 @@ bool retro_load_game(const struct retro_game_info *info)
       { 0 },
    };
 
-   if (!info || failed_init)
+   const struct retro_game_info_ext *info_ext = NULL;
+   const uint8_t *content_data                = NULL;
+   size_t content_size                        = 0;
+   const char *content_path                   = NULL;
+   char content_ext[8];
+
+   content_ext[0] = '\0';
+
+   if (failed_init)
       return false;
 
+   /* Attempt to fetch extended game info */
+   if (environ_cb(RETRO_ENVIRONMENT_GET_GAME_INFO_EXT, &info_ext))
+   {
+      content_data = (const uint8_t *)info_ext->data;
+      content_size = info_ext->size;
+
+      /* Content path information is only required
+       * if we do not have a valid data buffer */
+      if (!content_data)
+      {
+         content_path = info_ext->full_path;
+
+         strncpy(content_ext, info_ext->ext, sizeof(content_ext));
+         content_ext[sizeof(content_ext) - 1] = '\0';
+      }
+   }
+   else
+   {
+      const char *ext = NULL;
+
+      if (!info || !info->path)
+         return false;
+
+      content_data = NULL;
+      content_size = 0;
+      content_path = info->path;
+
+      if ((ext = strrchr(info->path, '.')))
+      {
+         strncpy(content_ext, ext + 1, sizeof(content_ext));
+         content_ext[sizeof(content_ext) - 1] = '\0';
+      }
+   }
+
    environ_cb(RETRO_ENVIRONMENT_SET_INPUT_DESCRIPTORS, desc);
 
    check_variables(false);
 
-   if (!MDFNI_LoadGame(info->path))
+   if (!MDFNI_LoadGame(content_path, content_ext,
+         content_data, content_size))
       return false;
 
    surf = (MDFN_Surface*)calloc(1, sizeof(*surf));
@@ -1827,8 +1900,18 @@ void retro_set_environment(retro_environment_t cb)
       { 0 },
    };
 
+   static const struct retro_system_content_info_override content_overrides[] = {
+      {
+         "pce|sgx", /* extensions */
+         false,     /* need_fullpath */
+         false      /* persistent_data */
+      },
+      { NULL, false, false }
+   };
+
    libretro_set_core_options(environ_cb);
    environ_cb(RETRO_ENVIRONMENT_SET_CONTROLLER_INFO, (void*)ports);
+   environ_cb(RETRO_ENVIRONMENT_SET_CONTENT_INFO_OVERRIDE, (void*)content_overrides);
 
    vfs_iface_info.required_interface_version = 1;
    vfs_iface_info.iface                      = NULL;

mednafen/pce/huc.cpp

@@ -203,7 +203,7 @@ static void LoadSaveMemory(const std::string& path, uint8* const data, const uin
 #endif
 }
 
-uint32 HuC_Load(MDFNFILE* fp, bool DisableBRAM, SysCardType syscard)
+uint32 HuC_Load(const uint8_t *data, size_t size, bool DisableBRAM, SysCardType syscard)
 {
 	uint32 crc = 0;
 	const uint32 sf2_threshold = 2048 * 1024;
@@ -213,24 +213,23 @@ uint32 HuC_Load(MDFNFILE* fp, bool DisableBRAM, SysCardType syscard)
 
 	uint64 len, m_len;
 
-	len = fp->size;
+	len = size;
 	if(len & 512)	// Skip copier header.
 	{
 		len &= ~512;
-		file_seek(fp, 512, SEEK_SET);
+		data += 512;
+		size -= 512;
 	}
 	m_len = (len + 8191) &~ 8191;
 
-	if(len >= 8192)
+	if(size >= 8192)
 	{
 		uint8 buf[8192];
 
-		file_read(fp, buf, 8192, 1);
+		memcpy(buf, data, 8192);
 
 		if(!memcmp(buf + 0x1FD0, "MCGENJIN", 8))
 			mcg_mapper = true;
-
-		file_seek(fp, -8192, SEEK_CUR);	// Seek backwards so we don't undo skip copier header.
 	}
 
 	if(!syscard && m_len >= sf2_threshold && !mcg_mapper)
@@ -273,7 +272,7 @@ uint32 HuC_Load(MDFNFILE* fp, bool DisableBRAM, SysCardType syscard)
 
 	if(mcg_mapper)
 	{
-		mcg = new MCGenjin(fp);
+		mcg = new MCGenjin(data, size);
 
 		for(unsigned i = 0; i < 128; i++)
 		{
@@ -303,7 +302,7 @@ uint32 HuC_Load(MDFNFILE* fp, bool DisableBRAM, SysCardType syscard)
 
 	HuCROM = new uint8[m_len];
 	memset(HuCROM, 0xFF, m_len);
-	file_read(fp, HuCROM, min_T<uint64>(m_len, len), 1);
+	memcpy(HuCROM, data, min_T<uint64>(m_len, size));
 	crc = encoding_crc32(0, HuCROM, min_T<uint64>(m_len, len));
 
 	if(syscard == SYSCARD_NONE)

mednafen/pce/huc.h

 #ifndef __MDFN_PCE_HUC_H
 #define __MDFN_PCE_HUC_H
 
+#include <stddef.h>
+
 typedef enum
 {
 	SYSCARD_NONE = 0,
@@ -10,7 +12,7 @@ typedef enum
 	SYSCARD_ARCADE		// 3.0 + extras
 } SysCardType;
 
-uint32 HuC_Load(MDFNFILE* fp, bool DisableBRAM = false, SysCardType syscard = SYSCARD_NONE) MDFN_COLD;
+uint32 HuC_Load(const uint8_t *data, size_t size, bool DisableBRAM = false, SysCardType syscard = SYSCARD_NONE) MDFN_COLD;
 void HuC_SaveNV(void);
 void HuC_Kill(void) MDFN_COLD;
 

mednafen/pce/mcgenjin.cpp

@@ -193,9 +193,9 @@ void MCGenjin::WriteNV(const unsigned di, const uint8 *buffer, uint32 offset, ui
 	cs[di]->WriteNV(buffer, offset, count);
 }
 
-MCGenjin::MCGenjin(MDFNFILE* fp)
+MCGenjin::MCGenjin(const uint8_t *data, size_t size)
 {
-	const uint64 rr_size = fp->size;
+	const uint64 rr_size = size;
 	uint8 revision, num256_pages, region, cs_di[2];
 
 	if(rr_size > 1024 * 1024 * 128)
@@ -211,7 +211,7 @@ MCGenjin::MCGenjin(MDFNFILE* fp)
 	}
 
 	rom.resize(round_up_pow2(rr_size));
-	file_read(fp, &rom[0], rr_size, 1);
+	memcpy(&rom[0], data, rr_size);
 
 	if(memcmp(&rom[0x1FD0], "MCGENJIN", 8))
 	{

mednafen/pce/mcgenjin.h

@@ -18,6 +18,8 @@
 #ifndef __MDFN_PCE_MCGENJIN_H
 #define __MDFN_PCE_MCGENJIN_H
 
+#include <stddef.h>
+
 class MCGenjin_CS_Device
 {
 	public:
@@ -43,7 +45,7 @@ class MCGenjin
 {
 	public:
 
-	MCGenjin(MDFNFILE* fp);
+	MCGenjin(const uint8_t *data, size_t size);
 	~MCGenjin();
 
 	void Power(void);

mednafen/pce/pce.cpp

@@ -295,7 +295,7 @@ static const struct
 	{ 0, "" }
 };
 
-MDFN_COLD int PCE_Load(MDFNFILE *fp)
+MDFN_COLD int PCE_Load(const uint8_t *data, size_t size, const char *ext)
 {
 	IsSGX = false;
 
@@ -303,9 +303,9 @@ MDFN_COLD int PCE_Load(MDFNFILE *fp)
 
 	uint32 crc;
 
-	crc = HuC_Load(fp, MDFN_GetSettingB("pce.disable_bram_hucard"));
+	crc = HuC_Load(data, size, MDFN_GetSettingB("pce.disable_bram_hucard"));
 
-	if(!strcmp(fp->ext, "sgx"))
+	if(!strcmp(ext, "sgx"))
 		IsSGX = true;
 	else
 	{
@@ -499,7 +499,7 @@ MDFN_COLD int PCE_LoadCD(std::vector<CDIF *> *CDInterfaces)
 	if(disable_bram_cd)
 		MDFN_printf("Warning: BRAM is disabled per pcfx.disable_bram_cd setting.  This is simulating a malfunction.\n");
 
-	HuC_Load(fp, disable_bram_cd, PCE_ACEnabled ? SYSCARD_ARCADE : SYSCARD_3);
+	HuC_Load(fp->data, fp->size, disable_bram_cd, PCE_ACEnabled ? SYSCARD_ARCADE : SYSCARD_3);
 	file_close(fp);
 
 	ADPCMBuf = new RavenBuffer();

mednafen/pce/pce.h

@@ -2,6 +2,7 @@
 #define __MDFN_PCE_PCE_H
 
 #include <vector>
+#include <stddef.h>
 
 #include <mednafen/mednafen.h>
 #include <mednafen/state.h>
@@ -21,7 +22,7 @@ extern MDFNGI EmulatedPCE;
 extern bool PCE_ACEnabled; // Arcade Card emulation enabled?
 extern void PCE_Power(void);
 
-extern MDFN_COLD int PCE_Load(MDFNFILE *fp);
+extern MDFN_COLD int PCE_Load(const uint8_t *data, size_t size, const char *ext);
 extern MDFN_COLD int PCE_LoadCD(std::vector<CDIF *> *CDInterfaces);
 extern MDFN_COLD void PCE_CloseGame(void);