blob: b2e0c396e26d9ff7d2554b5bbd79b5529f9e122d [file] [log] [blame]
/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "Stream"
#include "Stream.h"
#include <string.h>
#include "JNIHelpers.h"
#include "utils/log.h"
#include "utils/math.h"
static struct {
jmethodID read;
jmethodID reset;
} gInputStreamClassInfo;
Stream::Stream()
: mPeekBuffer(0)
, mPeekSize(0)
, mPeekOffset(0) {
}
Stream::~Stream() {
delete mPeekBuffer;
}
size_t Stream::peek(void* buffer, size_t size) {
size_t peek_remaining = mPeekSize - mPeekOffset;
if (size > peek_remaining) {
char* old_peek = mPeekBuffer;
mPeekBuffer = new char[size];
if (old_peek) {
memcpy(mPeekBuffer, old_peek + mPeekOffset, peek_remaining);
delete old_peek;
}
size_t read = doRead(mPeekBuffer + mPeekOffset, size - peek_remaining);
mPeekOffset = 0;
mPeekSize = peek_remaining + read;
}
size = min(size, mPeekSize - mPeekOffset);
memcpy(buffer, mPeekBuffer + mPeekOffset, size);
return size;
}
size_t Stream::read(void* buffer, size_t size) {
size_t bytes_read = 0;
size_t peek_remaining = mPeekSize - mPeekOffset;
if (peek_remaining) {
bytes_read = min(size, peek_remaining);
memcpy(buffer, mPeekBuffer + mPeekOffset, bytes_read);
mPeekOffset += bytes_read;
if (mPeekOffset == mPeekSize) {
delete mPeekBuffer;
mPeekBuffer = 0;
mPeekOffset = 0;
mPeekSize = 0;
}
size -= bytes_read;
buffer = ((char*) buffer) + bytes_read;
}
if (size) {
bytes_read += doRead(buffer, size);
}
return bytes_read;
}
size_t MemoryStream::doRead(void* buffer, size_t size) {
size = min(size, mRemaining);
memcpy(buffer, mBuffer, size);
mBuffer += size;
mRemaining -= size;
return size;
}
size_t FileStream::doRead(void* buffer, size_t size) {
return fread(buffer, 1, size, mFd);
}
size_t JavaInputStream::doRead(void* dstBuffer, size_t size) {
size_t totalBytesRead = 0;
do {
size_t requested = min(size, mByteArrayLength);
jint bytesRead = mEnv->CallIntMethod(mInputStream,
gInputStreamClassInfo.read, mByteArray, 0, requested);
if (mEnv->ExceptionCheck() || bytesRead < 0) {
return 0;
}
mEnv->GetByteArrayRegion(mByteArray, 0, bytesRead, (jbyte*)dstBuffer);
dstBuffer = (char*)dstBuffer + bytesRead;
totalBytesRead += bytesRead;
size -= bytesRead;
} while (size > 0);
return totalBytesRead;
}
jint JavaStream_OnLoad(JNIEnv* env) {
// Skip the verbose logging on error for these, as they won't be subject
// to obfuscators or similar and are thus unlikely to ever fail
jclass inputStreamClazz = env->FindClass("java/io/InputStream");
if (!inputStreamClazz) {
return -1;
}
gInputStreamClassInfo.read = env->GetMethodID(inputStreamClazz, "read", "([BII)I");
gInputStreamClassInfo.reset = env->GetMethodID(inputStreamClazz, "reset", "()V");
if (!gInputStreamClassInfo.read || !gInputStreamClassInfo.reset) {
return -1;
}
return 0;
}