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Minimal test - lines (41, 58)

Code

StringUnicharInputStream::Read(char16_t* aBuf, uint32_t aCount,
                               uint32_t* aReadCount) {
  if (mPos >= mLen) {
    *aReadCount = 0;
    return NS_OK;
  }
  nsAString::const_iterator iter;
  mString.BeginReading(iter);
  const char16_t* us = iter.get();
  uint32_t amount = mLen - mPos;
  if (amount > aCount) {
    amount = aCount;
  }
  memcpy(aBuf, us + mPos, sizeof(char16_t) * amount);
  mPos += amount;
  *aReadCount = amount;
  return NS_OK;
}

Minimal test - lines (24, 38)

Code

class StringUnicharInputStream final : public nsIUnicharInputStream {
 public:
  explicit StringUnicharInputStream(const nsAString& aString)
      : mString(aString), mPos(0), mLen(aString.Length()) {}

  NS_DECL_ISUPPORTS
  NS_DECL_NSIUNICHARINPUTSTREAM

  nsString mString;
  uint32_t mPos;
  uint32_t mLen;

 private:
  ~StringUnicharInputStream() = default;
};