Add support for ZIP extraction to temporary folders.

file.c

@@ -462,7 +462,8 @@ bool init_rom_file(void)
       {
          char temporary_rom[PATH_MAX];
          strlcpy(temporary_rom, roms->elems[i].data, sizeof(temporary_rom));
-         if (!zlib_extract_first_rom(temporary_rom, sizeof(temporary_rom), valid_ext))
+         if (!zlib_extract_first_rom(temporary_rom, sizeof(temporary_rom), valid_ext,
+                  *g_settings.extraction_directory ? g_settings.extraction_directory : NULL))
          {
             RARCH_ERR("Failed to extract ROM from zipped file: %s.\n", temporary_rom);
             string_list_free(roms);

file_extract.c

@@ -308,6 +308,7 @@ end:
 struct zip_extract_userdata
 {
    char *zip_path;
+   const char *extraction_directory;
    size_t zip_path_size;
    struct string_list *ext;
    bool found_rom;
@@ -323,8 +324,13 @@ static bool zip_extract_cb(const char *name, const uint8_t *cdata, unsigned cmod
    if (ext && string_list_find_elem(data->ext, ext))
    {
       char new_path[PATH_MAX];
-      fill_pathname_resolve_relative(new_path, data->zip_path,
-            path_basename(name), sizeof(new_path));
+
+      if (data->extraction_directory)
+         fill_pathname_join(new_path, data->extraction_directory,
+               path_basename(name), sizeof(new_path));
+      else
+         fill_pathname_resolve_relative(new_path, data->zip_path,
+               path_basename(name), sizeof(new_path));
 
       switch (cmode)
       {
@@ -350,7 +356,8 @@ static bool zip_extract_cb(const char *name, const uint8_t *cdata, unsigned cmod
    return true;
 }
 
-bool zlib_extract_first_rom(char *zip_path, size_t zip_path_size, const char *valid_exts)
+bool zlib_extract_first_rom(char *zip_path, size_t zip_path_size, const char *valid_exts,
+      const char *extraction_directory)
 {
    bool ret;
    struct zip_extract_userdata userdata = {0};
@@ -369,6 +376,7 @@ bool zlib_extract_first_rom(char *zip_path, size_t zip_path_size, const char *va
 
    userdata.zip_path = zip_path;
    userdata.zip_path_size = zip_path_size;
+   userdata.extraction_directory = extraction_directory;
    userdata.ext = list;
 
    if (!zlib_parse_file(zip_path, zip_extract_cb, &userdata))

file_extract.h

@@ -30,7 +30,7 @@ typedef bool (*zlib_file_cb)(const char *name,
 bool zlib_parse_file(const char *file, zlib_file_cb file_cb, void *userdata);
 
 // Built with zlib_parse_file.
-bool zlib_extract_first_rom(char *zip_path, size_t zip_path_size, const char *valid_exts);
+bool zlib_extract_first_rom(char *zip_path, size_t zip_path_size, const char *valid_exts, const char *extraction_dir);
 struct string_list *zlib_get_file_list(const char *path);
 
 bool zlib_inflate_data_to_file(const char *path, const uint8_t *data,

general.h

@@ -286,6 +286,8 @@ struct settings
    char screenshot_directory[PATH_MAX];
    char system_directory[PATH_MAX];
 
+   char extraction_directory[PATH_MAX];
+
    bool rewind_enable;
    size_t rewind_buffer_size;
    unsigned rewind_granularity;

retroarch.cfg

@@ -8,6 +8,10 @@
 # This will be overridden by explicit command line options.
 # savestate_directory =
 
+# If set to a directory, ROMs which are temporarily extracted
+# will be extracted to this directory.
+# extraction_directory =
+
 # Automatically saves a savestate at the end of RetroArch's lifetime.
 # The path is $SRAM_PATH.auto.
 # RetroArch will automatically load any savestate with this path on startup if savestate_auto_load is set.

settings.c

@@ -376,6 +376,7 @@ void config_set_defaults(void)
    *g_settings.cheat_settings_path = '\0';
    *g_settings.screenshot_directory = '\0';
    *g_settings.system_directory = '\0';
+   *g_settings.extraction_directory = '\0';
    *g_settings.input.autoconfig_dir = '\0';
    *g_settings.input.overlay = '\0';
    *g_settings.content_directory = '\0';
@@ -929,6 +930,7 @@ bool config_load_file(const char *path, bool set_defaults)
       }
    }
 
+   CONFIG_GET_PATH(extraction_directory, "extraction_directory");
    CONFIG_GET_PATH(content_directory, "content_directory");
    if (!strcmp(g_settings.content_directory, "default"))
       *g_settings.content_directory = '\0';
@@ -1276,6 +1278,7 @@ bool config_save_file(const char *path)
    config_set_int(conf, "audio_out_rate", g_settings.audio.out_rate);
 
    config_set_path(conf, "system_directory", *g_settings.system_directory ? g_settings.system_directory : "default");
+   config_set_path(conf, "extraction_directory", g_settings.extraction_directory);
    config_set_string(conf, "audio_resampler", g_settings.audio.resampler);
    config_set_path(conf, "savefile_directory", *g_extern.savefile_dir ? g_extern.savefile_dir : "default");
    config_set_path(conf, "savestate_directory", *g_extern.savestate_dir ? g_extern.savestate_dir : "default");