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 #include "inputstream_wrapper.h"
18 #include "error_codes.h"
19
20 jmethodID InputStreamWrapper::sReadID = NULL;
21 jmethodID InputStreamWrapper::sSkipID = NULL;
22
read(int32_t length,int32_t offset)23 int32_t InputStreamWrapper::read(int32_t length, int32_t offset) {
24 if (offset < 0 || length < 0 || (offset + length) > getBufferSize()) {
25 return J_ERROR_BAD_ARGS;
26 }
27 int32_t bytesRead = 0;
28 mEnv->ReleaseByteArrayElements(mByteArray, mBytes, JNI_COMMIT);
29 mBytes = NULL;
30 if (mEnv->ExceptionCheck()) {
31 return J_EXCEPTION;
32 }
33 bytesRead = static_cast<int32_t>(mEnv->CallIntMethod(mStream, sReadID,
34 mByteArray, offset, length));
35 if (mEnv->ExceptionCheck()) {
36 return J_EXCEPTION;
37 }
38 mBytes = mEnv->GetByteArrayElements(mByteArray, NULL);
39 if (mBytes == NULL || mEnv->ExceptionCheck()) {
40 return J_EXCEPTION;
41 }
42 if (bytesRead == END_OF_STREAM) {
43 return J_DONE;
44 }
45 return bytesRead;
46 }
47
skip(int64_t count)48 int64_t InputStreamWrapper::skip(int64_t count) {
49 int64_t bytesSkipped = 0;
50 bytesSkipped = static_cast<int64_t>(mEnv->CallLongMethod(mStream, sSkipID,
51 static_cast<jlong>(count)));
52 if (mEnv->ExceptionCheck() || bytesSkipped < 0) {
53 return J_EXCEPTION;
54 }
55 return bytesSkipped;
56 }
57
58 // Acts like a read call that returns the End Of Image marker for a JPEG file.
forceReadEOI()59 int32_t InputStreamWrapper::forceReadEOI() {
60 mBytes[0] = (jbyte) 0xFF;
61 mBytes[1] = (jbyte) 0xD9;
62 return 2;
63 }
64
setReadSkipMethodIDs(jmethodID readID,jmethodID skipID)65 void InputStreamWrapper::setReadSkipMethodIDs(jmethodID readID,
66 jmethodID skipID) {
67 sReadID = readID;
68 sSkipID = skipID;
69 }
70