Name

Return Value

If the compressed data in stream is at a synchronization point (see deflate() with a flush level of Z_SYNC_FLUSH or Z_FULL_FLUSH), inflateSyncPoint() shall return a non-zero value, other than Z_STREAM_ERROR. Otherwise, if the stream is valid, inflateSyncPoint() shall return 0. If stream is invalid, or in an invalid state, inflateSyncPoint() shall return Z_STREAM_ERROR to indicate the error.

Detailed Description

The inflateSyncPoint() function shall return a non-zero value if the compressed data stream referenced by stream is at a synchronization point.

Examples

#include <stdio.h>
#include <zlib.h>    

void InflateSyncPoint( )
{       
    uLong len = (uLong)strlen(hello)+1;
    Byte *compr, *uncompr;
    uLong comprLen = 20*sizeof(int); 
    uLong uncomprLen = comprLen;
    compr    = (Byte*)calloc((uInt)comprLen, 1);
    uncompr  = (Byte*)calloc((uInt)uncomprLen, 1);
    z_stream stream;
    const char hello[] = "hello, hello!";
    stream.next_in = (Bytef*)hello;
    stream.avail_in = (uInt)sourceLen;
    stream.next_out = dest;
    stream.avail_out = (uInt)*destLen;   
    stream.zalloc = (alloc_func)0;
    stream.zfree = (free_func)0;
    stream.opaque = (voidpf)0;
    err = deflateInit(&stream, level);
    err = deflate(&stream, Z_FINISH);    
    *destLen = stream.total_out;      
    int h=inflateSyncPoint(&stream);
    deflateEnd(&stream);
    free(compr);
    free(uncompr);
}            

A non-zero value of h , other than Z_STREAM_ERROR is indication of synchronization point.