Function read_buf

extlibs/minizip/src/deflate.c:1267–1295

=========================================================================== * Read a new buffer from the current input stream, update the adler32 * and total number of bytes read. All deflate() input goes through * this function so some applications may wish to modify it to avoid * allocating a large strm->next_in buffer and copying from it. * (See also flush_pending()). */

(strm, buf, size)

 * (See also flush_pending()).
 */
local unsigned read_buf(strm, buf, size)
z_streamp strm;
Bytef* buf;

unsigned size;
{
    unsigned len = strm->avail_in;

    if (len > size) len = size;
    if (len == 0) return 0;

    strm->avail_in -= len;

    zmemcpy(buf, strm->next_in, len);
    if (strm->state->wrap == 1)
    {
        strm->adler = adler32(strm->adler, buf, len);
    }
#ifdef GZIP
    else if (strm->state->wrap == 2)
    {
        strm->adler = crc32(strm->adler, buf, len);
    }
#endif
    strm->next_in += len;
    strm->total_in += len;

    return len;
}

/* ===========================================================================
 * Initialize the "longest match" routines for a new zlib stream