| 169 | } |
| 170 | |
| 171 | void mime_code::decode(string* out) |
| 172 | { |
| 173 | const unsigned char *cp; |
| 174 | int ch0, ch1, ch2, ch3; |
| 175 | |
| 176 | if (m_decodeCnt <= 0) { |
| 177 | return; |
| 178 | } |
| 179 | |
| 180 | /* ���뻺�嵽 4 ���ֽڲſ�ʼ���� */ |
| 181 | |
| 182 | for (cp = (const unsigned char *) m_decodeBuf; m_decodeCnt >= 4;) { |
| 183 | /* �������еĻس����з��������ֽ� '=' */ |
| 184 | |
| 185 | if (*cp == '\r' || *cp == '\n' || *cp == m_fillChar) { |
| 186 | cp++; |
| 187 | m_decodeCnt--; |
| 188 | continue; |
| 189 | } |
| 190 | |
| 191 | /* ��һ���ֽ� */ |
| 192 | |
| 193 | if ((ch0 = m_unTab[*cp])== INVALID) { |
| 194 | /* ����Ƿ�, ��ԭ�ַ� */ |
| 195 | if(m_addInvalid) { |
| 196 | out->push_back(*cp); |
| 197 | } |
| 198 | cp++; |
| 199 | m_decodeCnt--; |
| 200 | continue; |
| 201 | } |
| 202 | cp++; |
| 203 | m_decodeCnt--; |
| 204 | |
| 205 | /* �ڶ����ֽ� */ |
| 206 | |
| 207 | if ((ch1 = m_unTab[*cp])== INVALID) { |
| 208 | /* ����Ƿ�, ��ԭ�ַ� */ |
| 209 | if (m_addInvalid) { |
| 210 | out->push_back((char) (*cp)); |
| 211 | } |
| 212 | cp++; |
| 213 | m_decodeCnt--; |
| 214 | continue; |
| 215 | } |
| 216 | cp++; |
| 217 | m_decodeCnt--; |
| 218 | |
| 219 | out->push_back((char) (ch0 << 2 | ch1 >> 4)); |
| 220 | |
| 221 | /* �������ֽ� */ |
| 222 | |
| 223 | ch2 = *cp; |
| 224 | if (ch2 == m_fillChar) { |
| 225 | cp++; |
| 226 | m_decodeCnt--; |
| 227 | continue; |
| 228 | } |