250 lines
6.4 KiB
C
250 lines
6.4 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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static AAssetManager * getMgr(struct vfs *me)
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{
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return me->priv[0].mgr;
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}
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void
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Java_pt_up_yap_app_YAPDroid_load(JNIEnv *env,
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jobject assetManager) {
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AAssetManager *mgr = AAssetManager_fromJava(env, assetManager);
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if (mgr == NULL) {
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return;
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}
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VFS_t *me = GLOBAL_VFS;
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while ( strcmp(me->name, "/assets") == 0)
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me = me->next;
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me->priv[0].mgr = mgr;
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}
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static bool
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open_asset(struct vfs *me, struct stream_desc *st, const char *fname, const char
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*io_mode)
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{
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AAssetManager *mgr;
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int mode;
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const void *buf;
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if (strstr(fname,"/assets") == fname) {
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// we're in
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mgr = getMgr(me);
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if (mgr == NULL) {
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return PlIOError(PERMISSION_ERROR_OPEN_SOURCE_SINK, TermNil,
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"asset manager",
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fname);
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}
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if (strchr(io_mode, 'w') || strchr(io_mode, 'a')) {
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return PlIOError(PERMISSION_ERROR_OPEN_SOURCE_SINK, TermNil,
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"%s: no writing but flags are %s",
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fname, io_mode);
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}
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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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{
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mode = AASSET_MODE_UNKNOWN;
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}
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AAsset *a = AAssetManager_open(mgr , fname, mode);
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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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if ((fd = AAsset_openFileDescriptor64(a, &sz0, &sz)) >= 0) {
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// can use it as red-only file
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st->file = fdopen( fd, "r");
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st->vfs = me;
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st->vfs_handle = a;
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return true;
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} else 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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AAsset_close(a);
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return rc;
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}
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// should be done, but if not
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st->vfs_handle = a;
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st->vfs = me;
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return true;
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}
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if (me->next) {
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return me->next->open(me->next, st, fname, io_mode);
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}
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return NULL;
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}
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static bool
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close_asset(struct stream_desc *st)
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{
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AAsset_close(st->vfs_handle);
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return true;
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}
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static int64_t seek64(struct stream_desc *st, int64_t offset, int whence)
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{
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return AAsset_seek64(st->vfs_handle, offset, whence);
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}
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static int getc_asset(struct stream_desc *st)
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{
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int ch;
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if ( AAsset_read (st->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(struct vfs *me, const char *dirName)
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{
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return (void *)AAssetManager_openDir (getMgr(me), dirName);
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}
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static const char *readdir_a(void *dirHandle)
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{
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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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{
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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(struct vfs *me, const char *fname, vfs_stat *out)
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{
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struct stat64 bf;
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if (stat64( "/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, sizeof(struct timespec));
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}
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AAssetManager *mgr = getMgr(me);
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AAsset *a = AAssetManager_open(mgr , 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(struct vfs *me, const char *dirName)
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{
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bool rc;
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// try not to use it as an asset
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AAssetDir *d = AAssetManager_openDir (getMgr(me), 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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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(struct vfs *me, const char *dirName)
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{
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// try not to use it as an asset
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AAsset *d = AAssetManager_open (getMgr(me), dirName, AASSET_MODE_UNKNOWN);
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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 (struct vfs *me, const char *dirName) {
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chdir("/assets");
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if (me->virtual_cwd)
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free(me->virtual_cwd);
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me->virtual_cwd = malloc( sizeof(dirName) + 1 );
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return me!= NULL;
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}
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#endif
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/* create a new alias arg for stream sno */
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VFS_t *
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Yap_InitAssetManager(void)
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{
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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|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->putc = 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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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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