C++ CFX_ByteString函数代码示例

CFX_ByteString GetNameFromTT(const uint8_t* name_table,
                             uint32_t name_table_size,
                             uint32_t name_id) {
  if (!name_table || name_table_size < 6) {
    return CFX_ByteString();
  }
  uint32_t name_count = GET_TT_SHORT(name_table + 2);
  uint32_t string_offset = GET_TT_SHORT(name_table + 4);
  // We will ignore the possibility of overlap of structures and
  // string table as if it's all corrupt there's not a lot we can do.
  if (name_table_size < string_offset) {
    return CFX_ByteString();
  }

  const uint8_t* string_ptr = name_table + string_offset;
  uint32_t string_ptr_size = name_table_size - string_offset;
  name_table += 6;
  name_table_size -= 6;
  if (name_table_size < name_count * 12) {
    return CFX_ByteString();
  }

  for (uint32_t i = 0; i < name_count; i++, name_table += 12) {
    if (GET_TT_SHORT(name_table + 6) == name_id &&
        GET_TT_SHORT(name_table) == 1 && GET_TT_SHORT(name_table + 2) == 0) {
      return GetStringFromTable(string_ptr, string_ptr_size,
                                GET_TT_SHORT(name_table + 10),
                                GET_TT_SHORT(name_table + 8));
    }
  }
  return CFX_ByteString();
}

CFX_ByteString CPDF_Object::GetString() const
{
    switch (m_Type) {
        case PDFOBJ_BOOLEAN:
            return ((CPDF_Boolean*)this)->m_bValue ? "true" : "false";
        case PDFOBJ_NUMBER:
            return ((CPDF_Number*)this)->GetString();
        case PDFOBJ_STRING:
            return ((CPDF_String*)this)->m_String;
        case PDFOBJ_NAME:
            return ((CPDF_Name*)this)->m_Name;
        case PDFOBJ_REFERENCE: {
                CPDF_Reference* pRef = (CPDF_Reference*)(FX_LPVOID)this;
                if (pRef->m_pObjList == NULL) {
                    break;
                }
                CPDF_Object* pObj = pRef->m_pObjList->GetIndirectObject(pRef->m_RefObjNum);
                if (pObj == NULL) {
                    return CFX_ByteString();
                }
                return pObj->GetString();
            }
    }
    return CFX_ByteString();
}

CFX_ByteString CFPF_SkiaFont::GetFamilyName()
{
    if (!m_Face) {
        return CFX_ByteString();
    }
    return CFX_ByteString(FXFT_Get_Face_Family_Name(m_Face));
}

CFX_ByteString CPDF_StreamParser::ReadHexString() {
  if (!PositionIsInBounds())
    return CFX_ByteString();

  CFX_ByteTextBuf buf;
  bool bFirst = true;
  int code = 0;
  while (PositionIsInBounds()) {
    int ch = m_pBuf[m_Pos++];

    if (ch == '>')
      break;

    if (!std::isxdigit(ch))
      continue;

    int val = FXSYS_toHexDigit(ch);
    if (bFirst) {
      code = val * 16;
    } else {
      code += val;
      buf.AppendByte((uint8_t)code);
    }
    bFirst = !bFirst;
  }
  if (!bFirst)
    buf.AppendChar((char)code);

  if (buf.GetLength() > MAX_STRING_LENGTH)
    return CFX_ByteString(buf.GetBuffer(), MAX_STRING_LENGTH);

  return buf.GetByteString();
}

CFX_ByteString CFX_Font::GetFamilyName() const {
  if (!m_Face && !m_pSubstFont) {
    return CFX_ByteString();
  }
  if (m_Face) {
    return CFX_ByteString(FXFT_Get_Face_Family_Name(m_Face));
  }
  return m_pSubstFont->m_Family;
}

static CFX_ByteString GetStringFromTable(const uint8_t* string_ptr,
                                         uint32_t string_ptr_length,
                                         uint16_t offset,
                                         uint16_t length) {
  if (string_ptr_length < static_cast<uint32_t>(offset + length)) {
    return CFX_ByteString();
  }
  return CFX_ByteString(string_ptr + offset, length);
}

CFX_ByteString CFX_Font::GetFamilyName() const
{
    if (m_Face == NULL && m_pSubstFont == NULL) {
        return CFX_ByteString();
    }
    if (m_Face) {
        return CFX_ByteString(FXFT_Get_Face_Family_Name(m_Face));
    } else {
        return m_pSubstFont->m_Family;
    }
}

bool CXML_Element::GetAttrFloat(const CFX_ByteStringC& space,
                                const CFX_ByteStringC& name,
                                FX_FLOAT& attribute) const {
  const CFX_WideString* pValue =
      m_AttrMap.Lookup(CFX_ByteString(space), CFX_ByteString(name));
  if (pValue) {
    attribute = pValue->GetFloat();
    return true;
  }
  return false;
}

bool CXML_Element::GetAttrInteger(const CFX_ByteStringC& name,
                                  int& attribute) const {
  CFX_ByteStringC bsSpace;
  CFX_ByteStringC bsName;
  FX_XML_SplitQualifiedName(name, bsSpace, bsName);
  const CFX_WideString* pwsValue =
      m_AttrMap.Lookup(CFX_ByteString(bsSpace), CFX_ByteString(bsName));
  if (pwsValue) {
    attribute = pwsValue->GetInteger();
    return true;
  }
  return false;
}

void CPDF_StandardSecurityHandler::AES256_SetPassword(
    CPDF_Dictionary* pEncryptDict,
    const uint8_t* password,
    FX_DWORD size,
    FX_BOOL bOwner,
    const uint8_t* key) {
  uint8_t sha[128];
  CRYPT_SHA1Start(sha);
  CRYPT_SHA1Update(sha, key, 32);
  CRYPT_SHA1Update(sha, (uint8_t*)"hello", 5);
  uint8_t digest[20];
  CRYPT_SHA1Finish(sha, digest);
  CFX_ByteString ukey = pEncryptDict->GetString(FX_BSTRC("U"));
  uint8_t digest1[48];
  if (m_Revision >= 6) {
    Revision6_Hash(password, size, digest,
                   (bOwner ? (const uint8_t*)ukey : NULL), digest1);
  } else {
    CRYPT_SHA256Start(sha);
    CRYPT_SHA256Update(sha, password, size);
    CRYPT_SHA256Update(sha, digest, 8);
    if (bOwner) {
      CRYPT_SHA256Update(sha, ukey, ukey.GetLength());
    }
    CRYPT_SHA256Finish(sha, digest1);
  }
  FXSYS_memcpy(digest1 + 32, digest, 16);
  pEncryptDict->SetAtString(bOwner ? FX_BSTRC("O") : FX_BSTRC("U"),
                            CFX_ByteString(digest1, 48));
  if (m_Revision >= 6) {
    Revision6_Hash(password, size, digest + 8,
                   (bOwner ? (const uint8_t*)ukey : NULL), digest1);
  } else {
    CRYPT_SHA256Start(sha);
    CRYPT_SHA256Update(sha, password, size);
    CRYPT_SHA256Update(sha, digest + 8, 8);
    if (bOwner) {
      CRYPT_SHA256Update(sha, ukey, ukey.GetLength());
    }
    CRYPT_SHA256Finish(sha, digest1);
  }
  uint8_t* aes = FX_Alloc(uint8_t, 2048);
  CRYPT_AESSetKey(aes, 16, digest1, 32, TRUE);
  uint8_t iv[16];
  FXSYS_memset(iv, 0, 16);
  CRYPT_AESSetIV(aes, iv);
  CRYPT_AESEncrypt(aes, digest1, key, 32);
  FX_Free(aes);
  pEncryptDict->SetAtString(bOwner ? FX_BSTRC("OE") : FX_BSTRC("UE"),
                            CFX_ByteString(digest1, 32));
}

CFX_ByteString CPDF_StreamParser::ReadHexString()
{
    if (m_Size <= m_Pos) {
        return CFX_ByteString();
    }
    int ch = m_pBuf[m_Pos++];
    CFX_ByteTextBuf buf;
    FX_BOOL bFirst = TRUE;
    int code = 0;
    while (1) {
        if (ch == '>') {
            break;
        }
        if (ch >= '0' && ch <= '9') {
            if (bFirst) {
                code = (ch - '0') * 16;
            } else {
                code += ch - '0';
                buf.AppendChar((char)code);
            }
            bFirst = !bFirst;
        } else if (ch >= 'A' && ch <= 'F') {
            if (bFirst) {
                code = (ch - 'A' + 10) * 16;
            } else {
                code += ch - 'A' + 10;
                buf.AppendChar((char)code);
            }
            bFirst = !bFirst;
        } else if (ch >= 'a' && ch <= 'f') {
            if (bFirst) {
                code = (ch - 'a' + 10) * 16;
            } else {
                code += ch - 'a' + 10;
                buf.AppendChar((char)code);
            }
            bFirst = !bFirst;
        }
        if (m_Size <= m_Pos) {
            break;
        }
        ch = m_pBuf[m_Pos++];
    }
    if (!bFirst) {
        buf.AppendChar((char)code);
    }
    if (buf.GetLength() > MAX_STRING_LENGTH) {
        return CFX_ByteString(buf.GetBuffer(), MAX_STRING_LENGTH);
    }
    return buf.GetByteString();
}

CFX_ByteString CPDFSDK_DateTime::ToPDFDateTimeString()
{
	CFX_ByteString dtStr;
	char tempStr[32];
	sprintf(tempStr, "D:%04d%02d%02d%02d%02d%02d", dt.year, dt.month, dt.day, dt.hour, dt.minute, dt.second);
	dtStr = CFX_ByteString(tempStr);
	if (dt.tzHour < 0)
		dtStr += CFX_ByteString("-");
	else
		dtStr += CFX_ByteString("+");
	sprintf(tempStr, "%02d'%02d'", abs(dt.tzHour), dt.tzMinute);
	dtStr += CFX_ByteString(tempStr);
	return dtStr;
}

CPDF_Object* CPDF_StructElementImpl::GetAttr(const CFX_ByteStringC& owner,
                                             const CFX_ByteStringC& name,
                                             FX_BOOL bInheritable,
                                             FX_FLOAT fLevel) {
  if (fLevel > nMaxRecursion) {
    return nullptr;
  }
  if (bInheritable) {
    CPDF_Object* pAttr = GetAttr(owner, name, FALSE);
    if (pAttr) {
      return pAttr;
    }
    if (!m_pParent) {
      return nullptr;
    }
    return m_pParent->GetAttr(owner, name, TRUE, fLevel + 1);
  }
  CPDF_Object* pA = m_pDict->GetDirectObjectBy("A");
  if (pA) {
    CPDF_Dictionary* pAttrDict = FindAttrDict(pA, owner);
    if (pAttrDict) {
      CPDF_Object* pAttr = pAttrDict->GetDirectObjectBy(CFX_ByteString(name));
      if (pAttr) {
        return pAttr;
      }
    }
  }
  CPDF_Object* pC = m_pDict->GetDirectObjectBy("C");
  if (!pC)
    return nullptr;

  CPDF_Dictionary* pClassMap = m_pTree->m_pTreeRoot->GetDictBy("ClassMap");
  if (!pClassMap)
    return nullptr;

  if (CPDF_Array* pArray = pC->AsArray()) {
    for (uint32_t i = 0; i < pArray->GetCount(); i++) {
      CFX_ByteString class_name = pArray->GetStringAt(i);
      CPDF_Dictionary* pClassDict = pClassMap->GetDictBy(class_name);
      if (pClassDict && pClassDict->GetStringBy("O") == owner)
        return pClassDict->GetDirectObjectBy(CFX_ByteString(name));
    }
    return nullptr;
  }
  CFX_ByteString class_name = pC->GetString();
  CPDF_Dictionary* pClassDict = pClassMap->GetDictBy(class_name);
  if (pClassDict && pClassDict->GetStringBy("O") == owner)
    return pClassDict->GetDirectObjectBy(CFX_ByteString(name));
  return nullptr;
}

CFX_ByteString CFX_FontMapper::GetPSNameFromTT(void* hFont) {
  if (!m_pFontInfo)
    return CFX_ByteString();

  uint32_t size = m_pFontInfo->GetFontData(hFont, kTableNAME, nullptr, 0);
  if (!size)
    return CFX_ByteString();

  std::vector<uint8_t> buffer(size);
  uint8_t* buffer_ptr = buffer.data();
  uint32_t bytes_read =
      m_pFontInfo->GetFontData(hFont, kTableNAME, buffer_ptr, size);
  return bytes_read == size ? GetNameFromTT(buffer_ptr, bytes_read, 6)
                            : CFX_ByteString();
}

CPDF_Object* CPDF_StreamContentParser::GetObject(FX_DWORD index) {
  if (index >= m_ParamCount) {
    return NULL;
  }
  int real_index = m_ParamStartPos + m_ParamCount - index - 1;
  if (real_index >= PARAM_BUF_SIZE) {
    real_index -= PARAM_BUF_SIZE;
  }
  ContentParam& param = m_ParamBuf1[real_index];
  if (param.m_Type == PDFOBJ_NUMBER) {
    CPDF_Number* pNumber = param.m_Number.m_bInteger
                               ? new CPDF_Number(param.m_Number.m_Integer)
                               : new CPDF_Number(param.m_Number.m_Float);

    param.m_Type = 0;
    param.m_pObject = pNumber;
    return pNumber;
  }
  if (param.m_Type == PDFOBJ_NAME) {
    CPDF_Name* pName = new CPDF_Name(
        CFX_ByteString(param.m_Name.m_Buffer, param.m_Name.m_Len));
    param.m_Type = 0;
    param.m_pObject = pName;
    return pName;
  }
  if (param.m_Type == 0) {
    return param.m_pObject;
  }
  ASSERT(FALSE);
  return NULL;
}