Function report

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:lib\zstd\decompress.c Create Date:2022-07-28 07:06:51
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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Annotation kernel can get tool activityDownload SCCTChinese

Name: : nb of bytes read from src (< srcSize )

Proto:size_t ZSTD_decodeLiteralsBlock(ZSTD_DCtx *dctx, const void *src, size_t srcSize)

Type:size_t

Parameter:

TypeParameterName
ZSTD_DCtx *dctx
const void *src
size_tsrcSize

Brief:! ZSTD_decodeLiteralsBlock() :

434  If srcSize < r a non-null block Then Return -***************************************** Error codes handling(corruption_detected)
438  istart = src
439  litEncType = istart[0] & 3
442  Case litEncType == set_repeat
443  If litEntropy == 0 Then Return -***************************************** Error codes handling(dictionary_corrupted)
446  Case litEncType == set_compressed
447  If srcSize < 5 Then Return -***************************************** Error codes handling(corruption_detected)
451  singleStream = 0
452  lhlCode = istart[0] >> 2 & 3
453  lhc = ZSTD_readLE32(istart)
455  Case lhlCode == 0
456  Case lhlCode == 1
457  Default
459  singleStream = Not lhlCode
460  lhSize = 3
461  litSize = lhc >> 4 & 0x3FF
462  litCSize = lhc >> 14 & 0x3FF
463  Break
464  Case lhlCode == 2
466  lhSize = 4
467  litSize = lhc >> 4 & 0x3FFF
468  litCSize = lhc >> 18
469  Break
470  Case lhlCode == 3
472  lhSize = 5
473  litSize = lhc >> 4 & 0x3FFFF
474  litCSize = (lhc >> 22) + (istart[4] << 10)
475  Break
477  If litSize > Define for static allocation Then Return -***************************************** Error codes handling(corruption_detected)
479  If litCSize + lhSize > srcSize Then Return -***************************************** Error codes handling(corruption_detected)
482  If HUF_isError((litEncType == set_repeat) ? (singleStream ? Generic decompression selector : HUF_decompress4X_usingDTable(litBuffer, litSize, istart + lhSize, litCSize, HUFptr)) : (singleStream ? HUF_decompress1X2_DCtx_wksp(hufTable, litBuffer, litSize, istart + lhSize, litCSize, workspace, size of workspace ) : HUF_decompress4X_hufOnly_wksp(hufTable, litBuffer, litSize, istart + lhSize, litCSize, workspace, size of workspace ))) Then Return -***************************************** Error codes handling(corruption_detected)
493  litPtr = litBuffer
494  litSize = litSize
495  litEntropy = 1
496  If litEncType == set_compressed Then HUFptr = hufTable
498  memset(litBuffer + litSize, 0, ! ZSTD_wildcopy() :* custom version of memcpy(), can copy up to 7 bytes too many (8 bytes if length==0) )
499  Return litCSize + lhSize
502  Case litEncType == set_basic
504  lhlCode = istart[0] >> 2 & 3
506  Case lhlCode == 0
507  Case lhlCode == 2
508  Default
509  lhSize = 1
510  litSize = istart[0] >> 3
511  Break
512  Case lhlCode == 1
513  lhSize = 2
514  litSize = === Little endian r/w === >> 4
515  Break
516  Case lhlCode == 3
517  lhSize = 3
518  litSize = ZSTD_readLE24(istart) >> 4
519  Break
522  If lhSize + litSize + ! ZSTD_wildcopy() :* custom version of memcpy(), can copy up to 7 bytes too many (8 bytes if length==0) > srcSize Then
523  If litSize + lhSize > srcSize Then Return -***************************************** Error codes handling(corruption_detected)
525  No 3D Now!(litBuffer, istart + lhSize, litSize)
526  litPtr = litBuffer
527  litSize = litSize
528  memset(litBuffer + litSize, 0, ! ZSTD_wildcopy() :* custom version of memcpy(), can copy up to 7 bytes too many (8 bytes if length==0) )
529  Return lhSize + litSize
532  litPtr = istart + lhSize
533  litSize = litSize
534  Return lhSize + litSize
537  Case litEncType == set_rle
538  lhlCode = istart[0] >> 2 & 3
541  Case lhlCode == 0
542  Case lhlCode == 2
543  Default
544  lhSize = 1
545  litSize = istart[0] >> 3
546  Break
547  Case lhlCode == 1
548  lhSize = 2
549  litSize = === Little endian r/w === >> 4
550  Break
551  Case lhlCode == 3
552  lhSize = 3
553  litSize = ZSTD_readLE24(istart) >> 4
554  If srcSize < 4 Then Return -***************************************** Error codes handling(corruption_detected)
556  Break
558  If litSize > Define for static allocation Then Return -***************************************** Error codes handling(corruption_detected)
560  memset(litBuffer, istart[lhSize], litSize + ! ZSTD_wildcopy() :* custom version of memcpy(), can copy up to 7 bytes too many (8 bytes if length==0) )
561  litPtr = litBuffer
562  litSize = litSize
563  Return lhSize + 1
565  Default
566  Return -***************************************** Error codes handling(corruption_detected)
Caller
NameDescribe
ZSTD_decompressBlock_internal