226 lines
6.6 KiB
C
226 lines
6.6 KiB
C
/*************************************************************************
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* *
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* YAP Prolog *
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* *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
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* *
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**************************************************************************
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* *
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* File: assets.c *
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* Last rev: 5/2/88 *
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* mods: *
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* comments: Asset Support in ANDROID *
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* *
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*************************************************************************/
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#ifdef SCCSA
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static char SccsId[] = "%W% %G%";
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#endif
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/**
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* @file assets.c
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* @author VITOR SANTOS COSTA <vsc@VITORs-MBP.lan>
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* @date Thu Nov 19 10:53:20 2015
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*
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* @brief File Aliases
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*
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*
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*/
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#include <stdbool.h>
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#include "sysbits.h"
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// for native asset manager
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#include <sys/types.h>
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#if __ANDROID__
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#include <android/asset_manager.h>
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#include <android/native_activity.h>
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AAssetManager *Yap_assetManager;
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jboolean
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Java_pt_up_yap_app_YAPDroid_setAssetManager(JNIEnv *env, jclass clazz, jobject assetManager) {
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Yap_assetManager = AAssetManager_fromJava(env, assetManager);
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return true;
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}
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static void *
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open_asset__(VFS_t *me, int sno, const char *fname, const char *io_mode) {
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int mode;
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const void *buf;
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if (strchr(io_mode, 'B'))
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mode = AASSET_MODE_BUFFER;
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else {
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mode = AASSET_MODE_UNKNOWN;
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}
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fname += strlen(me->prefix) + 1;
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AAsset *a = AAssetManager_open(Yap_assetManager, fname, mode);
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if (!a)
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return NULL;
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// try not to use it as an asset
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off64_t sz = AAsset_getLength64(a), sz0 = 0;
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int fd;
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StreamDesc *st = GLOBAL_Stream + sno;
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if ((buf = AAsset_getBuffer(a))) {
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// copy to memory
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bool rc = Yap_set_stream_to_buf(st, buf, sz);
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if (rc) AAsset_close(a);
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st->vfs = NULL;
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st->vfs_handle = NULL;
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st->status = InMemory_Stream_f|Seekable_Stream_f|Input_Stream_f;
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return st;
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} else if ((fd = AAsset_openFileDescriptor64(a, &sz0, &sz)) >= 0) {
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// can use it as read-only file
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st->file = fdopen(fd, "r");
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st->vfs = NULL;
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st->vfs_handle = NULL;
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st->status = Seekable_Stream_f|Input_Stream_f;
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return st;
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} else {
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// should be done, but if not
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GLOBAL_Stream[sno].vfs_handle = a;
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st->vfs = me;
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st->status = Input_Stream_f;
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return a;
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}
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}
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static bool
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close_asset(int sno) {
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AAsset_close(GLOBAL_Stream[sno].vfs_handle);
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return true;
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}
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static int64_t seek64(int sno, int64_t offset, int whence) {
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return AAsset_seek64(GLOBAL_Stream[sno].vfs_handle, offset, whence);
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}
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static int getc_asset(int sno) {
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int ch;
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if (AAsset_read(GLOBAL_Stream[sno].vfs_handle, &ch, 1))
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return ch;
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return -1;
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}
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static void *opendir_a(VFS_t *me, const char *dirName) {
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dirName += strlen(me->prefix) + 1;
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return (void *) AAssetManager_openDir(Yap_assetManager, dirName);
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}
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static const char *readdir_a(void *dirHandle) {
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return AAssetDir_getNextFileName((AAssetDir *) dirHandle);
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}
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static bool closedir_a(void *dirHandle) {
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AAssetDir_close((AAssetDir *) dirHandle);
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return true;
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}
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static bool stat_a(VFS_t *me, const char *fname, vfs_stat *out) {
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struct stat bf;
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fname += strlen(me->prefix) + 1;
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if (stat("/assets", &bf)) {
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out->st_dev = bf.st_dev;
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out->st_uid = bf.st_uid;
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out->st_gid = bf.st_gid;
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memcpy(&out->st_atimespec, (const void *) &out->st_atimespec, sizeof(struct timespec));
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memcpy(&out->st_mtimespec, (const void *) &out->st_mtimespec, sizeof(struct timespec));
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memcpy(&out->st_ctimespec, (const void *) &out->st_ctimespec, sizeof(struct timespec));
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memcpy(&out->st_birthtimespec, (const void *) &out->st_birthtimespec,
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sizeof(struct timespec));
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}
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AAsset *a = AAssetManager_open(Yap_assetManager, fname, AASSET_MODE_UNKNOWN);
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// try not to use it as an asset
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out->st_size = AAsset_getLength64(a);
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AAsset_close(a);
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return true;
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}
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static
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bool is_dir_a(VFS_t *me, const char *dirName) {
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bool rc;
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dirName += strlen(me->prefix) + 1;
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// try not to use it as an asset
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AAssetDir *d = AAssetManager_openDir(Yap_assetManager, dirName);
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if (d == NULL)
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return false;
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rc = (AAssetDir_getNextFileName(d) != NULL);
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__android_log_print(ANDROID_LOG_INFO, "YAPDroid", "isdir %s <%p>", dirName, d);
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AAssetDir_close(d);
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return rc;
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}
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static
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bool exists_a(VFS_t *me, const char *dirName) {
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dirName += strlen(me->prefix) + 1;
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// try not to use it as an asset
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AAsset *d = AAssetManager_open(Yap_assetManager, dirName, AASSET_MODE_UNKNOWN);
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__android_log_print(ANDROID_LOG_INFO, "YAPDroid", "exists %s <%p>", dirName, d);
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if (d == NULL)
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return false;
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AAsset_close(d);
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return true;
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}
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static bool set_cwd(VFS_t *me, const char *dirName) {
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chdir("/assets");
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if (!me->virtual_cwd)
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me->virtual_cwd = malloc(YAP_FILENAME_MAX + 1);
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strcpy(me->virtual_cwd, dirName);
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return true;
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}
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#endif
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VFS_t *
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Yap_InitAssetManager(void) {
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#if __ANDROID__
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VFS_t *me;
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/* init standard VFS */
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me = (VFS_t *) Yap_AllocCodeSpace(sizeof(struct vfs));
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me->name = "/assets";
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me->vflags = VFS_CAN_EXEC | VFS_CAN_SEEK |
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VFS_HAS_PREFIX; /// the main flags describing the operation of the Fs.
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me->prefix = "/assets";
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/** operations */
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me->open = open_asset__; /// open an object in this space
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me->close = close_asset; /// close the object
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me->get_char = getc_asset; /// get an octet to the stream
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me->put_char = NULL; /// output an octet to the stream
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me->seek = seek64; /// jump around the stream
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me->opendir = opendir_a; /// open a directory object, if one exists
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me->nextdir = readdir_a; /// open a directory object, if one exists
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me->closedir = closedir_a; /// close access a directory object
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me->stat = stat_a; /// obtain size, age, permissions of a file.
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me->isdir = is_dir_a; /// obtain size, age, permissions of a file.
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me->exists = exists_a; /// obtain size, age, permissions of a file.
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me->chdir = set_cwd; /// chnage working directory.
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me->enc = ENC_ISO_UTF8; /// how the file is encoded.
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me->parsers = NULL; /// a set of parsers that can read the stream and generate a term
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me->writers = NULL;
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me->virtual_cwd = NULL;
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LOCK(BGL);
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me->next = GLOBAL_VFS;
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GLOBAL_VFS = me;
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return me;
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UNLOCK(BGL);
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return me;
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#else
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return NULL;
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#endif
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}
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