1/*
2 * Copyright (C) 2006 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef UTILS_DEFINED
18#define UTILS_DEFINED
19
20#include "SkStream.h"
21
22#include "android_util_Binder.h"
23
24#include <jni.h>
25#include <androidfw/Asset.h>
26
27namespace android {
28
29class AssetStreamAdaptor : public SkStream {
30public:
31    AssetStreamAdaptor(Asset* a) : fAsset(a) {}
32    virtual bool rewind();
33    virtual size_t read(void* buffer, size_t size);
34
35private:
36    Asset*  fAsset;
37};
38
39
40/** Restore the file descriptor's offset in our destructor
41 */
42class AutoFDSeek {
43public:
44    AutoFDSeek(int fd) : fFD(fd) {
45        fCurr = ::lseek(fd, 0, SEEK_CUR);
46    }
47    ~AutoFDSeek() {
48        if (fCurr >= 0) {
49            ::lseek(fFD, fCurr, SEEK_SET);
50        }
51    }
52private:
53    int     fFD;
54    off64_t   fCurr;
55};
56
57jobject nullObjectReturn(const char msg[]);
58
59}; // namespace android
60
61#endif
62