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    inflate_add

    (PHP 7)

    inflate_add — Incrementally inflate encoded data

    설명

    string inflate_add ( resource $context , string $encoded_data [, int $flush_mode = ZLIB_SYNC_FLUSH ] )

    Incrementally inflates encoded data in the specified context.

    Limitation: header information from GZIP compressed data are not made available.

    인수

    context

    A context created with inflate_init().

    encoded_data

    A chunk of compressed data.

    flush_mode

    One of ZLIB_BLOCK, ZLIB_NO_FLUSH, ZLIB_PARTIAL_FLUSH, ZLIB_SYNC_FLUSH (default), ZLIB_FULL_FLUSH, ZLIB_FINISH. Normally you will want to set ZLIB_NO_FLUSH to maximize compression, and ZLIB_FINISH to terminate with the last chunk of data. See the » zlib manual for a detailed description of these constants.

    반환값

    Returns a chunk of uncompressed data, 실패 시 FALSE를 반환합니다.

    오류/예외

    If invalid parameters are given, inflating the data requires a preset dictionary, but none is specified, the compressed stream is corrupt or has an invalid checksum, an error of level E_WARNING is generated.

    참고

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    User Contributed Notes 1 note

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    burp at -only-in-German-fuerspam dot de
    1 year ago
    It's not obvious how to use this for _incremental_ decompression:
    You feed _the compressed data_ into inflate_add() _in pieces_.
    The internal state of the zlib context will make sure than you can split at any point and still get the correct total data out, as long as you keep reading until the end.

    In this way, you don't have to hold the complete uncompressed data in memory at any one time (and don't have to materialize it either as a file for gzopen() etc.), allowing you to parse files much bigger than the available php memory limit.

    <?php
    /* a good step size depends on the input's level of compression,
    unfortunately there's no obvious way to know that beforehand;
    in doubt instead choose a rather small value and glue the pieces together,
    until there's enough data for processing */
    $step = 500000;

    $dataGz = load_gzip_compressed_data_to_string();

    $start = 0;
    $outLen = 0;
    $ctxt = inflate_init(ZLIB_ENCODING_GZIP);
    $status = inflate_get_status($inflCtxt);

    while(    $status == ZLIB_OK) {
            $split = substr($dataGz, $start, $step);
            $dataFragment = inflate_add($inflCtxt, $split);
            /* process fragment, potentially keep parts across iterations */
            $outLen += strlen($dataFragment);
            $status = inflate_get_status($inflCtxt);
            $start += $step;
    }
    echo     'Input: ' . strlen($dataGz) . ' Bytes / Output: ' . $outLen . ' Bytes.';
    ?>

    N.B.: Archives of extremely high compression will still bomb out with a stupid and unnecessary memory exhaustion, as it's not possible to define a limit in inflate_init() similar to gzuncompress().
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