framework/lynq-framework-service/src/sms/cdma/BitwiseInputStream.cpp

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#include "BitwiseInputStream.h"
#include <algorithm>
using namespace std;

BitwiseInputStream::BitwiseInputStream(std::vector<uint8_t> buf) {
  mBuf = buf;
  mEnd = buf.size() << 3;
  mPos = 0;

}

BitwiseInputStream::~BitwiseInputStream() {
  // TODO Auto-generated destructor stub
}

int BitwiseInputStream::available() {
  return mEnd - mPos;
}

uint32_t BitwiseInputStream::read(uint32_t bits) {
  uint32_t index = mPos >> 3;
  uint32_t offset = 16 - (mPos & 0x07) - bits;  // &7==%8
  if ((bits < 0) || (bits > 8) || ((mPos + bits) > mEnd)) {
    //TDB
    return -1;
  }
  uint32_t data = (mBuf[index] & 0xFF) << 8;
  if (offset < 8)
    data |= mBuf[index + 1] & 0xFF;
  data >>= offset;
  data &= (0xFFFFFFFF >> (32 - bits));
  mPos += bits;
  return data;
}

//uint8_t* BitwiseInputStream::readByteArray(uint32_t bits, int* length) {
//  uint32_t bytes = (bits >> 3) + ((bits & 0x07) > 0 ? 1 : 0);  // &7==%8
//  uint8_t* arr = new uint8_t[bytes];
//  for (int i = 0; i < bytes; i++) {
//    int increment = std::min((uint32_t) 8, bits - (i << 3));
//    arr[i] = (uint8_t) (read(increment) << (8 - increment));
//  }
//  return arr;
//}

std::vector<uint8_t> BitwiseInputStream::readByteVector(uint32_t bits) {
  uint32_t bytes = (bits >> 3) + ((bits & 0x07) > 0 ? 1 : 0);  // &7==%8
  std::vector<uint8_t> arr;
  //uint8_t* arr = new uint8_t[bytes];
  for (int i = 0; i < bytes; i++) {
    int increment = std::min((uint32_t) 8, bits - (i << 3));
    arr.push_back((uint8_t) (read(increment) << (8 - increment)));
    //arr[i] = (uint8_t) (read(increment) << (8 - increment));
  }
  return arr;
}

void BitwiseInputStream::skip(uint32_t bits) {
  if ((mPos + bits) > mEnd) {
    //TBD log
    return;
  }
  mPos += bits;
}