| 130 | } |
| 131 | |
| 132 | void CachedCompressedReadBuffer::seek(size_t offset_in_compressed_file, size_t offset_in_decompressed_block) |
| 133 | { |
| 134 | /// Nothing to do if we already at required position |
| 135 | if (!owned_cell && file_pos == offset_in_compressed_file |
| 136 | && ((!buffer().empty() && offset() == offset_in_decompressed_block) || |
| 137 | nextimpl_working_buffer_offset == offset_in_decompressed_block)) |
| 138 | return; |
| 139 | |
| 140 | if (owned_cell && |
| 141 | offset_in_compressed_file == file_pos - owned_cell->compressed_size && |
| 142 | offset_in_decompressed_block <= working_buffer.size()) |
| 143 | { |
| 144 | pos = working_buffer.begin() + offset_in_decompressed_block; |
| 145 | } |
| 146 | else |
| 147 | { |
| 148 | /// Remember position in compressed file (will be moved in nextImpl) |
| 149 | file_pos = offset_in_compressed_file; |
| 150 | /// We will discard our working_buffer, but have to account rest bytes |
| 151 | bytes += offset(); |
| 152 | /// No data, everything discarded |
| 153 | resetWorkingBuffer(); |
| 154 | owned_cell.reset(); |
| 155 | |
| 156 | /// Remember required offset in decompressed block which will be set in |
| 157 | /// the next ReadBuffer::next() call |
| 158 | nextimpl_working_buffer_offset = offset_in_decompressed_block; |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | std::pair<size_t, size_t> CachedCompressedReadBuffer::position() const |
| 163 | { |