/libs/rs/rsStream.cpp
http://github.com/CyanogenMod/android_frameworks_base · C++ · 113 lines · 81 code · 15 blank · 17 comment · 7 complexity · 425a670d64ed3a927bc523066e7cd906 MD5 · raw file
- /*
- * Copyright (C) 2009 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.
- */
- #include "rsContext.h"
- #include "rsStream.h"
- using namespace android;
- using namespace android::renderscript;
- IStream::IStream(const uint8_t *buf, bool use64) {
- mData = buf;
- mPos = 0;
- mUse64 = use64;
- }
- void IStream::loadByteArray(void *dest, size_t numBytes) {
- memcpy(dest, mData + mPos, numBytes);
- mPos += numBytes;
- }
- uint64_t IStream::loadOffset() {
- uint64_t tmp;
- if (mUse64) {
- mPos = (mPos + 7) & (~7);
- tmp = reinterpret_cast<const uint64_t *>(&mData[mPos])[0];
- mPos += sizeof(uint64_t);
- return tmp;
- }
- return loadU32();
- }
- void IStream::loadString(String8 *s) {
- uint32_t len = loadU32();
- s->setTo((const char *)&mData[mPos], len);
- mPos += len;
- }
- // Output stream implementation
- OStream::OStream(uint64_t len, bool use64) {
- mData = (uint8_t*)malloc(len);
- mLength = len;
- mPos = 0;
- mUse64 = use64;
- }
- OStream::~OStream() {
- free(mData);
- }
- void OStream::addByteArray(const void *src, size_t numBytes) {
- // We need to potentially grow more than once if the number of byes we write is substantial
- while (mPos + numBytes >= mLength) {
- growSize();
- }
- memcpy(mData + mPos, src, numBytes);
- mPos += numBytes;
- }
- void OStream::addOffset(uint64_t v) {
- if (mUse64) {
- mPos = (mPos + 7) & (~7);
- if (mPos + sizeof(v) >= mLength) {
- growSize();
- }
- mData[mPos++] = (uint8_t)(v & 0xff);
- mData[mPos++] = (uint8_t)((v >> 8) & 0xff);
- mData[mPos++] = (uint8_t)((v >> 16) & 0xff);
- mData[mPos++] = (uint8_t)((v >> 24) & 0xff);
- mData[mPos++] = (uint8_t)((v >> 32) & 0xff);
- mData[mPos++] = (uint8_t)((v >> 40) & 0xff);
- mData[mPos++] = (uint8_t)((v >> 48) & 0xff);
- mData[mPos++] = (uint8_t)((v >> 56) & 0xff);
- } else {
- addU32(v);
- }
- }
- void OStream::addString(String8 *s) {
- uint32_t len = s->size();
- addU32(len);
- if (mPos + len*sizeof(char) >= mLength) {
- growSize();
- }
- char *stringData = reinterpret_cast<char *>(&mData[mPos]);
- for (uint32_t i = 0; i < len; i ++) {
- stringData[i] = s->string()[i];
- }
- mPos += len*sizeof(char);
- }
- void OStream::growSize() {
- uint8_t *newData = (uint8_t*)malloc(mLength*2);
- memcpy(newData, mData, mLength*sizeof(uint8_t));
- mLength = mLength * 2;
- free(mData);
- mData = newData;
- }