函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:lib\zstd\decompress.c Create Date:2022-07-27 08:04:35
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称： : decompressed size of the frames contained

函数原型：unsigned long long ZSTD_findDecompressedSize(const void *src, size_t srcSize)

返回类型：unsigned long long

参数：

类型参数名称
const void *src
size_tsrcSize

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

322  totalDstSize等于0
323  当srcSize大于等于ZSTD_frameHeaderSize_prefix循环
324  magicNumber等于ZSTD_readLE32(src)
326  如果magicNumber按位与0xFFFFFFF0U的值恒等于ZSTD_MAGIC_SKIPPABLE_START则
328  如果srcSize小于magic number + skippable frame length 则返回:-***************************************** Error codes handling(srcSize_wrong)
330  skippableSize等于ZSTD_readLE32((constBYTE * )src + 4)加magic number + skippable frame length
331  如果srcSize小于skippableSize则
332  返回:ZSTD_CONTENTSIZE_ERROR
335  src等于src加skippableSize
336  srcSize减等于skippableSize
337  继续下一循环
341  ret等于 : decompressed size of the single frame pointed to be `src` if known, otherwise
342  如果ret大于等于ZSTD_CONTENTSIZE_ERROR则返回:ret
346  如果totalDstSize加ret小于totalDstSize则返回:ZSTD_CONTENTSIZE_ERROR
348  totalDstSize加等于ret
351  frameSrcSize等于 : the compressed size of the frame starting at `src`
352  如果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.则
353  返回:ZSTD_CONTENTSIZE_ERROR
356  src等于src加frameSrcSize
357  srcSize减等于frameSrcSize
361  如果srcSize则
362  返回:ZSTD_CONTENTSIZE_ERROR
365  返回:totalDstSize