1/*
2 * Copyright (C) 2009 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#include <media/stagefright/foundation/ADebug.h>
18#include <media/stagefright/FileSource.h>
19#include <sys/types.h>
20#include <unistd.h>
21#include <sys/types.h>
22#include <sys/stat.h>
23#include <fcntl.h>
24
25namespace android {
26
27FileSource::FileSource(const char *filename)
28    : mFd(-1),
29      mOffset(0),
30      mLength(-1),
31      mDecryptHandle(NULL),
32      mDrmManagerClient(NULL),
33      mDrmBufOffset(0),
34      mDrmBufSize(0),
35      mDrmBuf(NULL){
36
37    mFd = open(filename, O_LARGEFILE | O_RDONLY);
38
39    if (mFd >= 0) {
40        mLength = lseek64(mFd, 0, SEEK_END);
41    } else {
42        ALOGE("Failed to open file '%s'. (%s)", filename, strerror(errno));
43    }
44}
45
46FileSource::FileSource(int fd, int64_t offset, int64_t length)
47    : mFd(fd),
48      mOffset(offset),
49      mLength(length),
50      mDecryptHandle(NULL),
51      mDrmManagerClient(NULL),
52      mDrmBufOffset(0),
53      mDrmBufSize(0),
54      mDrmBuf(NULL){
55    CHECK(offset >= 0);
56    CHECK(length >= 0);
57}
58
59FileSource::~FileSource() {
60    if (mFd >= 0) {
61        close(mFd);
62        mFd = -1;
63    }
64
65    if (mDrmBuf != NULL) {
66        delete[] mDrmBuf;
67        mDrmBuf = NULL;
68    }
69
70    if (mDecryptHandle != NULL) {
71        // To release mDecryptHandle
72        CHECK(mDrmManagerClient);
73        mDrmManagerClient->closeDecryptSession(mDecryptHandle);
74        mDecryptHandle = NULL;
75    }
76
77    if (mDrmManagerClient != NULL) {
78        delete mDrmManagerClient;
79        mDrmManagerClient = NULL;
80    }
81}
82
83status_t FileSource::initCheck() const {
84    return mFd >= 0 ? OK : NO_INIT;
85}
86
87ssize_t FileSource::readAt(off64_t offset, void *data, size_t size) {
88    if (mFd < 0) {
89        return NO_INIT;
90    }
91
92    Mutex::Autolock autoLock(mLock);
93
94    if (mLength >= 0) {
95        if (offset >= mLength) {
96            return 0;  // read beyond EOF.
97        }
98        int64_t numAvailable = mLength - offset;
99        if ((int64_t)size > numAvailable) {
100            size = numAvailable;
101        }
102    }
103
104    if (mDecryptHandle != NULL && DecryptApiType::CONTAINER_BASED
105            == mDecryptHandle->decryptApiType) {
106        return readAtDRM(offset, data, size);
107   } else {
108        off64_t result = lseek64(mFd, offset + mOffset, SEEK_SET);
109        if (result == -1) {
110            ALOGE("seek to %lld failed", offset + mOffset);
111            return UNKNOWN_ERROR;
112        }
113
114        return ::read(mFd, data, size);
115    }
116}
117
118status_t FileSource::getSize(off64_t *size) {
119    Mutex::Autolock autoLock(mLock);
120
121    if (mFd < 0) {
122        return NO_INIT;
123    }
124
125    *size = mLength;
126
127    return OK;
128}
129
130sp<DecryptHandle> FileSource::DrmInitialization(const char *mime) {
131    if (mDrmManagerClient == NULL) {
132        mDrmManagerClient = new DrmManagerClient();
133    }
134
135    if (mDrmManagerClient == NULL) {
136        return NULL;
137    }
138
139    if (mDecryptHandle == NULL) {
140        mDecryptHandle = mDrmManagerClient->openDecryptSession(
141                mFd, mOffset, mLength, mime);
142    }
143
144    if (mDecryptHandle == NULL) {
145        delete mDrmManagerClient;
146        mDrmManagerClient = NULL;
147    }
148
149    return mDecryptHandle;
150}
151
152void FileSource::getDrmInfo(sp<DecryptHandle> &handle, DrmManagerClient **client) {
153    handle = mDecryptHandle;
154
155    *client = mDrmManagerClient;
156}
157
158ssize_t FileSource::readAtDRM(off64_t offset, void *data, size_t size) {
159    size_t DRM_CACHE_SIZE = 1024;
160    if (mDrmBuf == NULL) {
161        mDrmBuf = new unsigned char[DRM_CACHE_SIZE];
162    }
163
164    if (mDrmBuf != NULL && mDrmBufSize > 0 && (offset + mOffset) >= mDrmBufOffset
165            && (offset + mOffset + size) <= (mDrmBufOffset + mDrmBufSize)) {
166        /* Use buffered data */
167        memcpy(data, (void*)(mDrmBuf+(offset+mOffset-mDrmBufOffset)), size);
168        return size;
169    } else if (size <= DRM_CACHE_SIZE) {
170        /* Buffer new data */
171        mDrmBufOffset =  offset + mOffset;
172        mDrmBufSize = mDrmManagerClient->pread(mDecryptHandle, mDrmBuf,
173                DRM_CACHE_SIZE, offset + mOffset);
174        if (mDrmBufSize > 0) {
175            int64_t dataRead = 0;
176            dataRead = size > mDrmBufSize ? mDrmBufSize : size;
177            memcpy(data, (void*)mDrmBuf, dataRead);
178            return dataRead;
179        } else {
180            return mDrmBufSize;
181        }
182    } else {
183        /* Too big chunk to cache. Call DRM directly */
184        return mDrmManagerClient->pread(mDecryptHandle, data, size, offset + mOffset);
185    }
186}
187}  // namespace android
188