filesystem: add Android assets support

filesystem/android.c

@@ -0,0 +1,334 @@
+/*
+android.c - android support for filesystem
+Copyright (C) 2022 Velaron
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+*/
+
+#include "port.h"
+
+#if XASH_ANDROID
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include <stddef.h>
+#include STDINT_H
+#include "filesystem_internal.h"
+#include "crtlib.h"
+#include "xash3d_mathlib.h"
+#include "common/com_strings.h"
+
+#include <jni.h>
+#include <android/asset_manager.h>
+#include <android/asset_manager_jni.h>
+#include <time.h>
+
+struct android_assets_s
+{
+	string package_name;
+	qboolean engine;
+	AAssetManager *asset_manager;
+	AAssetDir *dir;
+};
+
+/*
+struct android_saf_s
+{
+
+};
+*/
+
+struct jni_methods_s
+{
+	JNIEnv *env;
+	jobject activity;
+	jclass activity_class;
+	jmethodID getPackageName;
+	jmethodID getCallingPackage;
+	jmethodID getAssetsList;
+} jni;
+
+static void Android_GetAssetManager( android_assets_t *assets )
+{
+	jmethodID getAssets;
+	jobject assetManager;
+
+	getAssets = (*jni.env)->GetMethodID( jni.env, jni.activity_class, "getAssets", "(Z)Landroid/content/res/AssetManager;" );
+	assetManager = (*jni.env)->CallObjectMethod( jni.env, jni.activity, getAssets, assets->engine );
+
+	if( assetManager )
+		assets->asset_manager = AAssetManager_fromJava( jni.env, assetManager );
+	else if( assets->engine )
+		Con_Reportf( S_WARN "Couldn't add engine assets!" );
+}
+
+static const char *Android_GetPackageName( qboolean engine )
+{
+	static string pkg;
+	jstring resultJNIStr;
+	const char *resultCStr;
+
+	resultJNIStr = (*jni.env)->CallObjectMethod( jni.env, jni.activity, engine ? jni.getPackageName : jni.getCallingPackage );
+
+	if( !resultJNIStr )
+		return NULL;
+
+	resultCStr = (*jni.env)->GetStringUTFChars( jni.env, resultJNIStr, NULL );
+	Q_strncpy( pkg, resultCStr, sizeof( pkg ));
+	(*jni.env)->ReleaseStringUTFChars( jni.env, resultJNIStr, resultCStr );
+
+	return pkg;
+}
+
+static void Android_ListDirectory( stringlist_t *list, const char *path, qboolean engine )
+{
+	jstring JStr = (*jni.env)->NewStringUTF( jni.env, path );
+	jobjectArray JNIArray = (*jni.env)->CallObjectMethod( jni.env, jni.activity, jni.getAssetsList, engine, JStr );
+	int JNIArraySize = (*jni.env)->GetArrayLength( jni.env, JNIArray );
+
+	for( int i = 0; i < JNIArraySize; i++ )
+	{
+		jstring JNIStr = (*jni.env)->GetObjectArrayElement( jni.env, JNIArray, i );
+		const char *CStr = (*jni.env)->GetStringUTFChars( jni.env, JNIStr, NULL );
+
+		stringlistappend( list, (char *)CStr );
+		(*jni.env)->ReleaseStringUTFChars( jni.env, JNIStr, CStr );
+	}
+}
+
+static void FS_CloseAndroidAssets( android_assets_t *assets )
+{
+	if( assets->dir )
+		AAssetDir_close( assets->dir );
+
+	Mem_Free( assets );
+}
+
+static android_assets_t *FS_LoadAndroidAssets( qboolean engine )
+{
+	android_assets_t *assets = (android_assets_t *)Mem_Calloc( fs_mempool, sizeof( android_assets_t ));
+	memset( assets, 0, sizeof( android_assets_t ));
+
+	assets->engine = engine;
+
+	Android_GetAssetManager( assets );
+	if( !assets->asset_manager )
+	{
+		FS_CloseAndroidAssets( assets );
+		return NULL;
+	}
+
+	assets->dir = AAssetManager_openDir( assets->asset_manager, "" );
+	if( !assets->dir )
+	{
+		FS_CloseAndroidAssets( assets );
+		return NULL;
+	}
+
+	return assets;
+}
+
+static int FS_FileTime_AndroidAssets( searchpath_t *search, const char *filename )
+{
+	static time_t time;
+
+	if( !time )
+	{
+		struct tm file_tm;
+
+		strptime( __DATE__ " "__TIME__, "%b %d %Y %H:%M:%S", &file_tm );
+		time = mktime( &file_tm );
+	}
+
+	return time;
+}
+
+static int FS_FindFile_AndroidAssets( struct searchpath_s *search, const char *path, char *fixedname, size_t len )
+{
+	AAsset *assets = AAssetManager_open( search->assets->asset_manager, path, AASSET_MODE_UNKNOWN );
+
+	if( assets )
+	{
+		AAsset_close( assets );
+
+		Q_strncpy( fixedname, path, len );
+		return 0;
+	}
+
+	return -1;
+}
+
+static void FS_PrintInfo_AndroidAssets( searchpath_t *search, char *dst, size_t size )
+{
+	Q_snprintf( dst, size, "%s", search->assets->package_name );
+}
+
+static void FS_Close_AndroidAssets( searchpath_t *search )
+{
+	FS_CloseAndroidAssets( search->assets );
+}
+
+static void FS_Search_AndroidAssets( searchpath_t *search, stringlist_t *list, const char *pattern, int caseinsensitive )
+{
+	string temp;
+	stringlist_t dirlist;
+	const char *slash, *backslash, *colon, *separator;
+	int basepathlength, dirlistindex, resultlistindex;
+	char *basepath;
+
+	slash = Q_strrchr( pattern, '/' );
+	backslash = Q_strrchr( pattern, '\\' );
+	colon = Q_strrchr( pattern, ':' );
+
+	separator = Q_max( slash, backslash );
+	separator = Q_max( separator, colon );
+
+	basepathlength = separator ? (separator + 1 - pattern) : 0;
+	basepath = Mem_Calloc( fs_mempool, basepathlength + 1 );
+	if( basepathlength )
+		memcpy( basepath, pattern, basepathlength );
+	basepath[basepathlength] = '\0';
+
+	stringlistinit( &dirlist );
+	Android_ListDirectory( &dirlist, basepath, search->assets->engine );
+
+	Q_strncpy( temp, basepath, sizeof( temp ));
+
+	for( dirlistindex = 0; dirlistindex < dirlist.numstrings; dirlistindex++ )
+	{
+		Q_strncpy( &temp[basepathlength], dirlist.strings[dirlistindex], sizeof( temp ) - basepathlength );
+
+		if( matchpattern( temp, (char *)pattern, true ))
+		{
+			for( resultlistindex = 0; resultlistindex < list->numstrings; resultlistindex++ )
+			{
+				if( !Q_strcmp( list->strings[resultlistindex], temp ))
+					break;
+			}
+
+			if( resultlistindex == list->numstrings )
+				stringlistappend( list, temp );
+		}
+	}
+
+	stringlistfreecontents( &dirlist );
+
+	Mem_Free( basepath );
+}
+
+static file_t *FS_OpenFile_AndroidAssets( searchpath_t *search, const char *filename, const char *mode, int pack_ind )
+{
+	file_t *file = (file_t *)Mem_Calloc( fs_mempool, sizeof( file_t ));
+	AAsset *assets = AAssetManager_open( search->assets->asset_manager, filename, AASSET_MODE_RANDOM );
+
+	file->handle = AAsset_openFileDescriptor( assets, &file->offset, &file->real_length );
+
+	file->position = 0;
+	file->ungetc = EOF;
+
+	AAsset_close( assets );
+
+	return file;
+}
+
+static byte *FS_LoadAndroidAssetsFile( searchpath_t *search, const char *path, int pack_ind, fs_offset_t *filesize )
+{
+	byte *buf;
+	off_t size;
+	AAsset *asset;
+
+	if( filesize ) *filesize = 0;
+
+	asset = AAssetManager_open( search->assets->asset_manager, path, AASSET_MODE_RANDOM );
+	if( !asset )
+		return NULL;
+
+	size = AAsset_getLength( asset );
+
+	buf = (byte *)Mem_Malloc( fs_mempool, size + 1 );
+	buf[size] = '\0';
+
+	if( AAsset_read( asset, buf, size ) < 0 )
+	{
+		Mem_Free( buf );
+		AAsset_close( asset );
+		return NULL;
+	}
+
+	AAsset_close( asset );
+
+	if( filesize ) *filesize = size;
+
+	return buf;
+}
+
+searchpath_t *FS_AddAndroidAssets_Fullpath( const char *path, int flags )
+{
+	searchpath_t *search;
+	android_assets_t *assets = NULL;
+	qboolean engine = true;
+
+	if(( flags & FS_STATIC_PATH ) || ( flags & FS_CUSTOM_PATH ))
+		return NULL;
+
+	if(( flags & FS_GAMEDIR_PATH ) && Q_stricmp( GI->basedir, GI->gamefolder ))
+		engine = false;
+
+	assets = FS_LoadAndroidAssets( engine );
+
+	if( !assets )
+	{
+		Con_Reportf( S_ERROR "%s: unable to load Android assets \"%s\"\n", __FUNCTION__, Android_GetPackageName( engine ) );
+		return NULL;
+	}
+
+	Q_strncpy( assets->package_name, Android_GetPackageName( engine ), sizeof( assets->package_name ));
+
+	search = (searchpath_t *)Mem_Calloc( fs_mempool, sizeof( searchpath_t ));
+	memset( search, 0, sizeof( searchpath_t ));
+
+	Q_strncpy( search->filename, assets->package_name, sizeof( search->filename ));
+	search->assets = assets;
+	search->type = SEARCHPATH_ANDROID_ASSETS;
+	search->flags = FS_NOWRITE_PATH | FS_CUSTOM_PATH;
+
+	search->pfnPrintInfo = FS_PrintInfo_AndroidAssets;
+	search->pfnClose = FS_Close_AndroidAssets;
+	search->pfnOpenFile = FS_OpenFile_AndroidAssets;
+	search->pfnFileTime = FS_FileTime_AndroidAssets;
+	search->pfnFindFile = FS_FindFile_AndroidAssets;
+	search->pfnSearch = FS_Search_AndroidAssets;
+	search->pfnLoadFile = FS_LoadAndroidAssetsFile;
+
+	Con_Reportf( "Adding Android assets: %s\n", assets->package_name );
+
+	return search;
+}
+
+void FS_InitAndroid( void )
+{
+	jmethodID getContext;
+
+	jni.env = (JNIEnv *)Sys_GetNativeObject( "JNIEnv" );
+	jni.activity_class = Sys_GetNativeObject( "ActivityClass" );
+
+	getContext = (*jni.env)->GetStaticMethodID( jni.env, jni.activity_class, "getContext", "()Landroid/content/Context;" );
+	jni.activity = (*jni.env)->CallStaticObjectMethod( jni.env, jni.activity_class, getContext );
+
+	jni.getPackageName = (*jni.env)->GetMethodID( jni.env, jni.activity_class, "getPackageName", "()Ljava/lang/String;" );
+	jni.getCallingPackage = (*jni.env)->GetMethodID( jni.env, jni.activity_class, "getCallingPackage", "()Ljava/lang/String;" );
+	jni.getAssetsList = (*jni.env)->GetMethodID( jni.env, jni.activity_class, "getAssetsList", "(ZLjava/lang/String;)[Ljava/lang/String;" );
+}
+
+#endif // XASH_ANDROID

filesystem/filesystem.c

@@ -71,8 +71,10 @@ const fs_archive_t g_archives[] =
 static const fs_archive_t g_directory_archive =
 { NULL, SEARCHPATH_PLAIN, FS_AddDir_Fullpath, false };
 
-// static const fs_archive_t g_android_archive =
-// { NULL, SEARCHPATH_ANDROID, FS_AddAndroid_Fullpath, false, false };
+#ifdef XASH_ANDROID
+static const fs_archive_t g_android_archive =
+{ NULL, SEARCHPATH_ANDROID_ASSETS, FS_AddAndroidAssets_Fullpath, false };
+#endif
 
 #ifdef XASH_REDUCE_FD
 static file_t *fs_last_readfile;
@@ -403,6 +405,10 @@ void FS_AddGameDirectory( const char *dir, uint flags )
 
 	stringlistfreecontents( &list );
 
+#ifdef XASH_ANDROID
+	FS_AddArchive_Fullpath( &g_android_archive, dir, flags );
+#endif
+
 	// add the directory to the search path
 	// (unpacked files have the priority over packed files)
 	search = FS_AddArchive_Fullpath( &g_directory_archive, dir, flags );
@@ -1406,6 +1412,10 @@ qboolean FS_InitStdio( qboolean unused_set_to_true, const char *rootdir, const c
 
 	FS_InitMemory();
 
+#ifdef XASH_ANDROID
+	FS_InitAndroid();
+#endif
+
 	Q_strncpy( fs_rootdir, rootdir, sizeof( fs_rootdir ));
 	Q_strncpy( fs_gamedir, gamedir, sizeof( fs_gamedir ));
 	Q_strncpy( fs_basedir, basedir, sizeof( fs_basedir ));

filesystem/filesystem_internal.h

@@ -22,6 +22,10 @@ GNU General Public License for more details.
 #include "xash3d_types.h"
 #include "filesystem.h"
 
+#if XASH_ANDROID
+#include <android/asset_manager.h>
+#endif
+
 #ifdef __cplusplus
 extern "C"
 {
@@ -31,6 +35,10 @@ typedef struct dir_s dir_t;
 typedef struct zip_s zip_t;
 typedef struct pack_s pack_t;
 typedef struct wfile_s wfile_t;
+#if XASH_ANDROID
+typedef struct android_assets_s android_assets_t;
+// typedef struct android_saf_s android_saf_t;
+#endif
 
 #define FILE_BUFF_SIZE		(2048)
 
@@ -58,7 +66,8 @@ enum
 	SEARCHPATH_PAK,
 	SEARCHPATH_WAD,
 	SEARCHPATH_ZIP,
-	SEARCHPATH_PK3DIR, // it's actually a plain directory but it must behave like a ZIP archive
+	SEARCHPATH_PK3DIR, // it's actually a plain directory but it must behave like a ZIP archive,
+	SEARCHPATH_ANDROID_ASSETS
 };
 
 typedef struct stringlist_s
@@ -81,6 +90,9 @@ typedef struct searchpath_s
 		pack_t  *pack;
 		wfile_t *wad;
 		zip_t   *zip;
+#if XASH_ANDROID
+		android_assets_t *assets;
+#endif
 	};
 
 	struct searchpath_s *next;
@@ -225,6 +237,12 @@ searchpath_t *FS_AddDir_Fullpath( const char *path, int flags );
 qboolean FS_FixFileCase( dir_t *dir, const char *path, char *dst, const size_t len, qboolean createpath );
 void FS_InitDirectorySearchpath( searchpath_t *search, const char *path, int flags );
 
+//
+// android.c
+//
+void FS_InitAndroid( void );
+searchpath_t *FS_AddAndroidAssets_Fullpath( const char *path, int flags );
+
 #ifdef __cplusplus
 }
 #endif