Function report

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:lib\zstd\decompress.c Create Date:2022-07-28 07:06:46
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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Name: : decompressed size of the frames contained

Proto:unsigned long long ZSTD_findDecompressedSize(const void *src, size_t srcSize)

Type:unsigned long long

Parameter:

TypeParameterName
const void *src
size_tsrcSize

Brief:ZSTD_findDecompressedSize() :* compatible with legacy mode* `srcSize` must be the exact length of some number of ZSTD compressed and/or* skippable frames

322  totalDstSize = 0
323  When srcSize >= ZSTD_frameHeaderSize_prefix cycle
324  magicNumber = ZSTD_readLE32(src)
326  If (magicNumber & 0xFFFFFFF0U) == ZSTD_MAGIC_SKIPPABLE_START Then
328  If srcSize < magic number + skippable frame length Then Return -***************************************** Error codes handling(srcSize_wrong)
330  skippableSize = ZSTD_readLE32((constBYTE * )src + 4) + magic number + skippable frame length
331  If srcSize < skippableSize Then
332  Return ZSTD_CONTENTSIZE_ERROR
335  src = src + skippableSize
336  srcSize -= skippableSize
337  Continue
341  ret = : decompressed size of the single frame pointed to be `src` if known, otherwise
342  If ret >= ZSTD_CONTENTSIZE_ERROR Then Return ret
346  If totalDstSize + ret < totalDstSize Then Return ZSTD_CONTENTSIZE_ERROR
348  totalDstSize += ret
351  frameSrcSize = : the compressed size of the frame starting at `src`
352  If ZSTD_isError() - tells if a size_t function result is an error code*@code: The function result to check for error.* Return: Non-zero iff the code is an error. Then
353  Return ZSTD_CONTENTSIZE_ERROR
356  src = src + frameSrcSize
357  srcSize -= frameSrcSize
361  If srcSize Then
362  Return ZSTD_CONTENTSIZE_ERROR
365  Return totalDstSize