从PHP中的/Filter/FlateDecode PDF流提取数据 [英] Data extraction from /Filter /FlateDecode PDF stream in PHP

问题描述

我无法解密流中的数据，例如:

I can not decrypt the data from the stream like:

    56 0 obj 
    << /Length 1242 /Filter /FlateDecode >>
    stream
    x]êΩnƒ Ñ{ûbÀKq¬æ\âê¢....(whole binary is omitted)
    endstream
    endobj

我尝试将文件和二进制字符串中的二进制内容(x]êΩnƒ Ñ{ûbÀKq¬æ\âê¢....)隔离开.解码功能gzinflate($encripted_data)向我发送解码错误，我认为发生这种情况是因为编码后的内容未缩小".

I tried isolate the binary content (x]êΩnƒ Ñ{ûbÀKq¬æ\âê¢....) in a file and in a binary string. Decoding function gzinflate($encripted_data) sends me error of decoding, and I think it happens because encoded content in not "deflated" or so.

在PDF参考v 1.7(第六版)的第67页中，我发现/FlateDecode过滤器的描述为: ...对使用zlib/deflate压缩方法编码的数据进行解压缩，从而再现原始文本或二进制数据

In PDF Reference v 1.7, (six edition), on a page 67, I found the description of /FlateDecode filter as: ...Decompresses data encoded using the zlib/deflate compression method, reproducing the original text or binary data

我需要真正的原始解决方案，aka php函数或/和算法来处理此"\ FlateDecoded"流.

I need real raw solution, aka php function or/and algorithm what to do with this "\FlateDecoded" stream.

谢谢！

推荐答案

header('Content-Type: text');           // I going to download the result of decoding
$n = "binary_file.bin";                 // decoded part in file in a directory
$f = @fopen($n, "rb");                  // now file is mine
$c = fread($f, filesize($n));           // now I know all about it 
$u = @gzuncompress($c);                 // function, exactly fits for this /FlateDecode filter
$out = fopen("php://output", "wb");     // ready to output anywhere
fwrite($out, $u);                       // output to downloadable file

铃铛！铃儿响叮当！...

Jingle bells! Jingle bells!...

gzuncompress()-解决方案

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