LZ4_compress_destSize

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Description

LZ4_compress_destSize() : Reverse the logic : compresses as much data as possible from 'src' buffer into already allocated buffer 'dst', of size >= 'targetDestSize'. This function either compresses the entire 'src' content into 'dst' if it's large enough, or fill 'dst' buffer completely with as much data as possible from 'src'. note: acceleration parameter is fixed to "default".

*srcSizePtr : will be modified to indicate how many bytes where read from 'src' to fill 'dst'. New value is necessarily <= input value. Note : from v1.8.2 to v1.9.1, this function had a bug (fixed un v1.9.2+): the produced compressed content could, in specific circumstances, require to be decompressed into a destination buffer larger by at least 1 byte than the content to decompress. If an application uses `LZ4compress_destSize(), it's highly recommended to update liblz4 to v1.9.2 or better. If this can't be done or ensured, the receiving decompression function should provide a dstCapacity which is > decompressedSize, by at least 1 byte. See https://github.com/lz4/lz4/issues/859 for details

LZ4int LZ4_compress_destSize  
(  
    const char * src,  
    char * dst,  
    int * srcSizePtr,  
    int targetDstSize  
)  
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LZ4int LZ4_compress_destSize (     const char * src,     char * dst,     int * srcSizePtr,     int targetDstSize )

: Nb bytes written into 'dst' (necessarily <= targetDestSize) or 0 if compression fails.