[英]PHP output buffering (ob_start, ob_flush)
I used php output buffering earlier in order to create csv file from database, because i didn't want to create an existing file, just wanted to make content downloadable. 我以前使用php输出缓冲来从数据库创建csv文件,因为我不想创建现有文件,只是想使内容可下载。
CSV is text-based file, so its easy to create this way, you set the header and flush the text content. CSV是基于文本的文件,因此可以轻松地通过这种方式创建,设置标题并刷新文本内容。 But!
但! What if, I want to create an exe from hex data?
如果我想从十六进制数据创建一个exe怎么办? (The project is: I have an existing exe file and I want that users can write something inside a HTML textbox and I convert that to hex and exchange the old text to the new one)
(该项目是:我有一个现有的exe文件,并且我希望用户可以在HTML文本框中编写一些内容,然后将其转换为十六进制并将旧文本替换为新文本)。
Thanks. 谢谢。
Use following code to download exe file by reading from hard disk. 使用以下代码通过从硬盘读取文件来下载exe文件。
<?php
$file = 'test.exe';
if (file_exists($file)) {
header('Content-Description: File Transfer');
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename='.basename($file));
header('Content-Transfer-Encoding: binary');
header('Expires: 0');
header('Cache-Control: must-revalidate');
header('Pragma: public');
header('Content-Length: ' . filesize($file));
ob_clean();
flush();
readfile($file);
exit;
}
If you want to replace part of binary file, for example from 100th byte to 200th byte you could use substr() and str_pad(): 如果要替换二进制文件的一部分,例如从第100个字节到第200个字节,则可以使用substr()和str_pad():
$binFile = file_get_contents('/pathto/exec/file.exec');
$replacedBinFile = substr($binFile, 0, 100) . str_pad(substr($_POST['text'], 0, 100), 100, "\x00") . substr($binFile, 200);
file_put_contents('/pathto/exec/file_replaced.exec', $replacedBinFile);
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