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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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 2
* 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.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#if defined(__ANDROID__)
#include <jni.h>
#include <sys/types.h>
#include <unistd.h>
#include "common/str.h"
#include "common/stream.h"
#include "common/util.h"
#include "common/archive.h"
#include "common/debug.h"
#include "common/textconsole.h"
#include "backends/platform/android/jni.h"
#include "backends/platform/android/asset-archive.h"
// Must match android.content.res.AssetManager.ACCESS_*
const jint ACCESS_UNKNOWN = 0;
const jint ACCESS_RANDOM = 1;
// This might be useful to someone else. Assumes markSupported() == true.
class JavaInputStream : public Common::SeekableReadStream {
public:
JavaInputStream(JNIEnv *env, jobject is);
virtual ~JavaInputStream();
virtual bool eos() const {
return _eos;
}
virtual bool err() const {
return _err;
}
virtual void clearErr() {
_eos = _err = false;
}
virtual uint32 read(void *dataPtr, uint32 dataSize);
virtual int32 pos() const {
return _pos;
}
virtual int32 size() const {
return _len;
}
virtual bool seek(int32 offset, int whence = SEEK_SET);
private:
void close(JNIEnv *env);
jmethodID MID_mark;
jmethodID MID_available;
jmethodID MID_close;
jmethodID MID_read;
jmethodID MID_reset;
jmethodID MID_skip;
jobject _input_stream;
jsize _buflen;
jbyteArray _buf;
uint32 _pos;
jint _len;
bool _eos;
bool _err;
};
JavaInputStream::JavaInputStream(JNIEnv *env, jobject is) :
_eos(false),
_err(false),
_pos(0)
{
_input_stream = env->NewGlobalRef(is);
_buflen = 8192;
_buf = (jbyteArray)env->NewGlobalRef(env->NewByteArray(_buflen));
jclass cls = env->GetObjectClass(_input_stream);
MID_mark = env->GetMethodID(cls, "mark", "(I)V");
assert(MID_mark);
MID_available = env->GetMethodID(cls, "available", "()I");
assert(MID_mark);
MID_close = env->GetMethodID(cls, "close", "()V");
assert(MID_close);
MID_read = env->GetMethodID(cls, "read", "([BII)I");
assert(MID_read);
MID_reset = env->GetMethodID(cls, "reset", "()V");
assert(MID_reset);
MID_skip = env->GetMethodID(cls, "skip", "(J)J");
assert(MID_skip);
// Mark start of stream, so we can reset back to it.
// readlimit is set to something bigger than anything we might
// want to seek within.
env->CallVoidMethod(_input_stream, MID_mark, 10 * 1024 * 1024);
_len = env->CallIntMethod(_input_stream, MID_available);
}
JavaInputStream::~JavaInputStream() {
JNIEnv *env = JNI::getEnv();
close(env);
env->DeleteGlobalRef(_buf);
env->DeleteGlobalRef(_input_stream);
}
void JavaInputStream::close(JNIEnv *env) {
env->CallVoidMethod(_input_stream, MID_close);
if (env->ExceptionCheck())
env->ExceptionClear();
}
uint32 JavaInputStream::read(void *dataPtr, uint32 dataSize) {
JNIEnv *env = JNI::getEnv();
if (_buflen < jint(dataSize)) {
_buflen = dataSize;
env->DeleteGlobalRef(_buf);
_buf = static_cast<jbyteArray>(env->NewGlobalRef(env->NewByteArray(_buflen)));
}
jint ret = env->CallIntMethod(_input_stream, MID_read, _buf, 0, dataSize);
if (env->ExceptionCheck()) {
warning("Exception during JavaInputStream::read(%p, %d)",
dataPtr, dataSize);
env->ExceptionDescribe();
env->ExceptionClear();
_err = true;
ret = -1;
} else if (ret == -1) {
_eos = true;
ret = 0;
} else {
env->GetByteArrayRegion(_buf, 0, ret, static_cast<jbyte *>(dataPtr));
_pos += ret;
}
return ret;
}
bool JavaInputStream::seek(int32 offset, int whence) {
JNIEnv *env = JNI::getEnv();
uint32 newpos;
switch (whence) {
case SEEK_SET:
newpos = offset;
break;
case SEEK_CUR:
newpos = _pos + offset;
break;
case SEEK_END:
newpos = _len + offset;
break;
default:
debug("Unknown 'whence' arg %d", whence);
return false;
}
jlong skip_bytes;
if (newpos > _pos) {
skip_bytes = newpos - _pos;
} else {
// Can't skip backwards, so jump back to start and skip from there.
env->CallVoidMethod(_input_stream, MID_reset);
if (env->ExceptionCheck()) {
warning("Failed to rewind to start of asset stream");
env->ExceptionDescribe();
env->ExceptionClear();
return false;
}
_pos = 0;
skip_bytes = newpos;
}
while (skip_bytes > 0) {
jlong ret = env->CallLongMethod(_input_stream, MID_skip, skip_bytes);
if (env->ExceptionCheck()) {
warning("Failed to skip %ld bytes into asset stream",
static_cast<long>(skip_bytes));
env->ExceptionDescribe();
env->ExceptionClear();
return false;
} else if (ret == 0) {
warning("InputStream->skip(%ld) didn't skip any bytes. Aborting seek.",
static_cast<long>(skip_bytes));
// No point looping forever...
return false;
}
_pos += ret;
skip_bytes -= ret;
}
_eos = false;
return true;
}
// Must match android.content.res.AssetFileDescriptor.UNKNOWN_LENGTH
const jlong UNKNOWN_LENGTH = -1;
// Reading directly from a fd is so much more efficient, that it is
// worth optimising for.
class AssetFdReadStream : public Common::SeekableReadStream {
public:
AssetFdReadStream(JNIEnv *env, jobject assetfd);
virtual ~AssetFdReadStream();
virtual bool eos() const {
return _eos;
}
virtual bool err() const {
return _err;
}
virtual void clearErr() {
_eos = _err = false;
}
virtual uint32 read(void *dataPtr, uint32 dataSize);
virtual int32 pos() const {
return _pos;
}
virtual int32 size() const {
return _declared_len;
}
virtual bool seek(int32 offset, int whence = SEEK_SET);
private:
void close(JNIEnv *env);
int _fd;
jmethodID MID_close;
jobject _assetfd;
jlong _start_off;
jlong _declared_len;
uint32 _pos;
bool _eos;
bool _err;
};
AssetFdReadStream::AssetFdReadStream(JNIEnv *env, jobject assetfd) :
_eos(false),
_err(false),
_pos(0)
{
_assetfd = env->NewGlobalRef(assetfd);
jclass cls = env->GetObjectClass(_assetfd);
MID_close = env->GetMethodID(cls, "close", "()V");
assert(MID_close);
jmethodID MID_getStartOffset =
env->GetMethodID(cls, "getStartOffset", "()J");
assert(MID_getStartOffset);
_start_off = env->CallLongMethod(_assetfd, MID_getStartOffset);
jmethodID MID_getDeclaredLength =
env->GetMethodID(cls, "getDeclaredLength", "()J");
assert(MID_getDeclaredLength);
_declared_len = env->CallLongMethod(_assetfd, MID_getDeclaredLength);
jmethodID MID_getFileDescriptor =
env->GetMethodID(cls, "getFileDescriptor",
"()Ljava/io/FileDescriptor;");
assert(MID_getFileDescriptor);
jobject javafd = env->CallObjectMethod(_assetfd, MID_getFileDescriptor);
assert(javafd);
jclass fd_cls = env->GetObjectClass(javafd);
jfieldID FID_descriptor = env->GetFieldID(fd_cls, "descriptor", "I");
assert(FID_descriptor);
_fd = env->GetIntField(javafd, FID_descriptor);
}
AssetFdReadStream::~AssetFdReadStream() {
JNIEnv *env = JNI::getEnv();
env->CallVoidMethod(_assetfd, MID_close);
if (env->ExceptionCheck())
env->ExceptionClear();
env->DeleteGlobalRef(_assetfd);
}
uint32 AssetFdReadStream::read(void *dataPtr, uint32 dataSize) {
if (_declared_len != UNKNOWN_LENGTH) {
jlong cap = _declared_len - _pos;
if (dataSize > cap)
dataSize = cap;
}
int ret = ::read(_fd, dataPtr, dataSize);
if (ret == 0)
_eos = true;
else if (ret == -1)
_err = true;
else
_pos += ret;
return ret;
}
bool AssetFdReadStream::seek(int32 offset, int whence) {
if (whence == SEEK_SET) {
if (_declared_len != UNKNOWN_LENGTH && offset > _declared_len)
offset = _declared_len;
offset += _start_off;
} else if (whence == SEEK_END && _declared_len != UNKNOWN_LENGTH) {
whence = SEEK_SET;
offset = _start_off + _declared_len + offset;
}
int ret = lseek(_fd, offset, whence);
if (ret == -1)
return false;
_pos = ret - _start_off;
_eos = false;
return true;
}
AndroidAssetArchive::AndroidAssetArchive(jobject am) {
JNIEnv *env = JNI::getEnv();
_am = env->NewGlobalRef(am);
jclass cls = env->GetObjectClass(_am);
MID_open = env->GetMethodID(cls, "open",
"(Ljava/lang/String;I)Ljava/io/InputStream;");
assert(MID_open);
MID_openFd = env->GetMethodID(cls, "openFd", "(Ljava/lang/String;)"
"Landroid/content/res/AssetFileDescriptor;");
assert(MID_openFd);
MID_list = env->GetMethodID(cls, "list",
"(Ljava/lang/String;)[Ljava/lang/String;");
assert(MID_list);
}
AndroidAssetArchive::~AndroidAssetArchive() {
JNIEnv *env = JNI::getEnv();
env->DeleteGlobalRef(_am);
}
bool AndroidAssetArchive::hasFile(const Common::String &name) const {
JNIEnv *env = JNI::getEnv();
jstring path = env->NewStringUTF(name.c_str());
jobject result = env->CallObjectMethod(_am, MID_open, path, ACCESS_UNKNOWN);
if (env->ExceptionCheck()) {
// Assume FileNotFoundException
//warning("Error while calling AssetManager->open(%s)", name.c_str());
//env->ExceptionDescribe();
env->ExceptionClear();
env->DeleteLocalRef(path);
return false;
}
env->DeleteLocalRef(result);
env->DeleteLocalRef(path);
return true;
}
int AndroidAssetArchive::listMembers(Common::ArchiveMemberList &member_list) const {
JNIEnv *env = JNI::getEnv();
Common::List<Common::String> dirlist;
dirlist.push_back("");
int count = 0;
while (!dirlist.empty()) {
const Common::String dir = dirlist.back();
dirlist.pop_back();
jstring jpath = env->NewStringUTF(dir.c_str());
jobjectArray jpathlist =
(jobjectArray)env->CallObjectMethod(_am, MID_list, jpath);
if (env->ExceptionCheck()) {
warning("Error while calling AssetManager->list(%s). Ignoring.",
dir.c_str());
env->ExceptionDescribe();
env->ExceptionClear();
// May as well keep going ...
continue;
}
env->DeleteLocalRef(jpath);
for (jsize i = 0; i < env->GetArrayLength(jpathlist); ++i) {
jstring elem = (jstring)env->GetObjectArrayElement(jpathlist, i);
const char *p = env->GetStringUTFChars(elem, 0);
if (strlen(p)) {
Common::String thispath = dir;
if (!thispath.empty())
thispath += "/";
thispath += p;
// Assume files have a . in them, and directories don't
if (strchr(p, '.')) {
member_list.push_back(getMember(thispath));
++count;
} else {
dirlist.push_back(thispath);
}
}
env->ReleaseStringUTFChars(elem, p);
env->DeleteLocalRef(elem);
}
env->DeleteLocalRef(jpathlist);
}
return count;
}
const Common::ArchiveMemberPtr AndroidAssetArchive::getMember(const Common::String &name) const {
return Common::ArchiveMemberPtr(new Common::GenericArchiveMember(name, this));
}
Common::SeekableReadStream *AndroidAssetArchive::createReadStreamForMember(const Common::String &path) const {
JNIEnv *env = JNI::getEnv();
jstring jpath = env->NewStringUTF(path.c_str());
// Try openFd() first ...
jobject afd = env->CallObjectMethod(_am, MID_openFd, jpath);
if (env->ExceptionCheck())
env->ExceptionClear();
else if (afd != 0) {
// success :)
env->DeleteLocalRef(jpath);
return new AssetFdReadStream(env, afd);
}
// ... and fallback to normal open() if that doesn't work
jobject is = env->CallObjectMethod(_am, MID_open, jpath, ACCESS_RANDOM);
if (env->ExceptionCheck()) {
// Assume FileNotFoundException
//warning("Error opening %s", path.c_str());
//env->ExceptionDescribe();
env->ExceptionClear();
env->DeleteLocalRef(jpath);
return 0;
}
return new JavaInputStream(env, is);
}
#endif
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