1/*
2 * Copyright (C) 2013 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 RASTERMILL_STREAM_H
18#define RASTERMILL_STREAM_H
19
20#include <jni.h>
21#include <stdio.h>
22#include <sys/types.h>
23
24class Stream {
25public:
26    Stream();
27    virtual ~Stream();
28
29    size_t peek(void* buffer, size_t size);
30    size_t read(void* buffer, size_t size);
31
32protected:
33    virtual size_t doRead(void* buffer, size_t size) = 0;
34
35private:
36    char* mPeekBuffer;
37    size_t mPeekSize;
38    size_t mPeekOffset;
39};
40
41class MemoryStream : public Stream {
42public:
43    MemoryStream(void* buffer, size_t size) :
44            mBuffer((char*)buffer),
45            mRemaining(size) {}
46
47protected:
48    virtual size_t doRead(void* buffer, size_t size);
49
50private:
51    char* mBuffer;
52    size_t mRemaining;
53};
54
55class FileStream : public Stream {
56public:
57    FileStream(FILE* fd) : mFd(fd) {}
58
59protected:
60    virtual size_t doRead(void* buffer, size_t size);
61
62private:
63    FILE* mFd;
64};
65
66class JavaInputStream : public Stream {
67public:
68    JavaInputStream(JNIEnv* env, jobject inputStream, jbyteArray byteArray) :
69            mEnv(env),
70            mInputStream(inputStream),
71            mByteArray(byteArray),
72            mByteArrayLength(env->GetArrayLength(byteArray)) {}
73
74protected:
75    virtual size_t doRead(void* buffer, size_t size);
76
77private:
78    JNIEnv* mEnv;
79    const jobject mInputStream;
80    const jbyteArray mByteArray;
81    const size_t mByteArrayLength;
82};
83
84jint JavaStream_OnLoad(JNIEnv* env);
85
86#endif //RASTERMILL_STREAM_H
87