DataURISource.cpp revision 69c1e038717d3462ea5991425ba009f0aed148d2 
1/*
2 * Copyright (C) 2014 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/DataURISource.h>
18
19#include <media/stagefright/foundation/ABuffer.h>
20#include <media/stagefright/foundation/AString.h>
21#include <media/stagefright/foundation/base64.h>
22
23namespace android {
24
25// static
26sp<DataURISource> DataURISource::Create(const char *uri) {
27    if (strncasecmp("data:", uri, 5)) {
28        return NULL;
29    }
30
31    char *commaPos = strrchr(uri, ',');
32
33    if (commaPos == NULL) {
34        return NULL;
35    }
36
37    sp<ABuffer> buffer;
38
39    AString tmp(&uri[5], commaPos - &uri[5]);
40
41    if (tmp.endsWith(";base64")) {
42        AString encoded(commaPos + 1);
43
44        // Strip CR and LF...
45        for (size_t i = encoded.size(); i > 0;) {
46            i--;
47            if (encoded.c_str()[i] == '\r' || encoded.c_str()[i] == '\n') {
48                encoded.erase(i, 1);
49            }
50        }
51
52        buffer = decodeBase64(encoded);
53
54        if (buffer == NULL) {
55            ALOGE("Malformed base64 encoded content found.");
56            return NULL;
57        }
58    } else {
59#if 0
60        size_t dataLen = strlen(uri) - tmp.size() - 6;
61        buffer = new ABuffer(dataLen);
62        memcpy(buffer->data(), commaPos + 1, dataLen);
63
64        // unescape
65#else
66        // MediaPlayer doesn't care for this right now as we don't
67        // play any text-based media.
68        return NULL;
69#endif
70    }
71
72    // We don't really care about charset or mime type.
73
74    return new DataURISource(buffer);
75}
76
77DataURISource::DataURISource(const sp<ABuffer> &buffer)
78    : mBuffer(buffer) {
79}
80
81DataURISource::~DataURISource() {
82}
83
84status_t DataURISource::initCheck() const {
85    return OK;
86}
87
88ssize_t DataURISource::readAt(off64_t offset, void *data, size_t size) {
89    if ((offset < 0) || (offset >= (off64_t)mBuffer->size())) {
90        return 0;
91    }
92
93    size_t copy = mBuffer->size() - offset;
94    if (copy > size) {
95        copy = size;
96    }
97
98    memcpy(data, mBuffer->data() + offset, copy);
99
100    return copy;
101}
102
103status_t DataURISource::getSize(off64_t *size) {
104    *size = mBuffer->size();
105
106    return OK;
107}
108
109}  // namespace android
110
111