| 251 | } |
| 252 | |
| 253 | void forDecodeRangeAsDoubles(const FrameOfReferenceEncoded& enc, Span<double> out, std::size_t row_start) { |
| 254 | const std::size_t count = out.size(); |
| 255 | const double ref = static_cast<double>(enc.reference); |
| 256 | const uint8_t* base = enc.offsets.data(); |
| 257 | |
| 258 | switch (enc.offset_bytes) { |
| 259 | case 1: { |
| 260 | const uint8_t* src = base + row_start; |
| 261 | for (std::size_t i = 0; i < count; ++i) { |
| 262 | out[i] = ref + static_cast<double>(src[i]); |
| 263 | } |
| 264 | break; |
| 265 | } |
| 266 | case 2: { |
| 267 | const uint8_t* src = base + row_start * 2; |
| 268 | for (std::size_t i = 0; i < count; ++i) { |
| 269 | uint16_t v{}; |
| 270 | std::memcpy(&v, src + i * 2, sizeof(v)); |
| 271 | out[i] = ref + static_cast<double>(v); |
| 272 | } |
| 273 | break; |
| 274 | } |
| 275 | default: { |
| 276 | const uint8_t* src = base + row_start * 4; |
| 277 | for (std::size_t i = 0; i < count; ++i) { |
| 278 | uint32_t v{}; |
| 279 | std::memcpy(&v, src + i * 4, sizeof(v)); |
| 280 | out[i] = ref + static_cast<double>(v); |
| 281 | } |
| 282 | break; |
| 283 | } |
| 284 | } |
| 285 | } |
| 286 | |
| 287 | // --------------------------------------------------------------------------- |
| 288 | // Dictionary encoding for strings |