runDecoder will run the decoder for the remainder of the frame.
(dst []byte, dec *blockDec)
| 328 | |
| 329 | // runDecoder will run the decoder for the remainder of the frame. |
| 330 | func (d *frameDec) runDecoder(dst []byte, dec *blockDec) ([]byte, error) { |
| 331 | saved := d.history.b |
| 332 | |
| 333 | // We use the history for output to avoid copying it. |
| 334 | d.history.b = dst |
| 335 | d.history.ignoreBuffer = len(dst) |
| 336 | // Store input length, so we only check new data. |
| 337 | crcStart := len(dst) |
| 338 | d.history.decoders.maxSyncLen = 0 |
| 339 | if d.o.limitToCap { |
| 340 | d.history.decoders.maxSyncLen = uint64(cap(dst) - len(dst)) |
| 341 | } |
| 342 | if d.FrameContentSize != fcsUnknown { |
| 343 | if !d.o.limitToCap || d.FrameContentSize+uint64(len(dst)) < d.history.decoders.maxSyncLen { |
| 344 | d.history.decoders.maxSyncLen = d.FrameContentSize + uint64(len(dst)) |
| 345 | } |
| 346 | if d.history.decoders.maxSyncLen > d.o.maxDecodedSize { |
| 347 | if debugDecoder { |
| 348 | println("maxSyncLen:", d.history.decoders.maxSyncLen, "> maxDecodedSize:", d.o.maxDecodedSize) |
| 349 | } |
| 350 | return dst, ErrDecoderSizeExceeded |
| 351 | } |
| 352 | if debugDecoder { |
| 353 | println("maxSyncLen:", d.history.decoders.maxSyncLen) |
| 354 | } |
| 355 | if !d.o.limitToCap && uint64(cap(dst)) < d.history.decoders.maxSyncLen { |
| 356 | // Alloc for output |
| 357 | dst2 := make([]byte, len(dst), d.history.decoders.maxSyncLen+compressedBlockOverAlloc) |
| 358 | copy(dst2, dst) |
| 359 | dst = dst2 |
| 360 | } |
| 361 | } |
| 362 | var err error |
| 363 | for { |
| 364 | err = dec.reset(d.rawInput, d.WindowSize) |
| 365 | if err != nil { |
| 366 | break |
| 367 | } |
| 368 | if debugDecoder { |
| 369 | println("next block:", dec) |
| 370 | } |
| 371 | err = dec.decodeBuf(&d.history) |
| 372 | if err != nil { |
| 373 | break |
| 374 | } |
| 375 | if uint64(len(d.history.b)-crcStart) > d.o.maxDecodedSize { |
| 376 | println("runDecoder: maxDecodedSize exceeded", uint64(len(d.history.b)-crcStart), ">", d.o.maxDecodedSize) |
| 377 | err = ErrDecoderSizeExceeded |
| 378 | break |
| 379 | } |
| 380 | if d.o.limitToCap && len(d.history.b) > cap(dst) { |
| 381 | println("runDecoder: cap exceeded", uint64(len(d.history.b)), ">", cap(dst)) |
| 382 | err = ErrDecoderSizeExceeded |
| 383 | break |
| 384 | } |
| 385 | if uint64(len(d.history.b)-crcStart) > d.FrameContentSize { |
| 386 | println("runDecoder: FrameContentSize exceeded", uint64(len(d.history.b)-crcStart), ">", d.FrameContentSize) |
| 387 | err = ErrFrameSizeExceeded |