md5-file

MD5 hash for zip files

由 白昼怎懂夜的黑 提交于 2019-12-23 10:07:45
问题 Is it possible to generate MD5 hash for .zip files in java? All the examples I found were for .txt files. I want to know when we unzip the data, edit a file, again zip it and find the hash, will it be different from the original one? 回答1: You can create MD5 hashes for any arbitrary file, independently of the file type. The hash just takes any byte stream and doesn't interpret its meaning at all. So you can use the examples you have found for .txt files and apply them to .zip files. And yes,

C# calculate MD5 for opened file?

由 梦想与她 提交于 2019-12-20 19:57:28
问题 how I can calculate MD5 hash for a file that is open or used by a process? the files can be txt or and exe my current code return error for an exe because it is running here is my current code public static string GetMd5HashFromFile(string fileName) { FileStream file = new FileStream(fileName, FileMode.Open); MD5 md5 = new MD5CryptoServiceProvider(); byte[] retVal = md5.ComputeHash(file); file.Close(); StringBuilder sb = new StringBuilder(); for (int i = 0; i < retVal.Length; i++) { sb.Append

Checking the MD5 of file in VB.NET

由 社会主义新天地 提交于 2019-12-13 03:21:03
问题 When a user clicks on the button, it will ask him to choose a specific file. It checks the MD5 hash to know if this is the right file. The problem with the code is that it gives me "Wrong File" message, and I'm totally sure that the MD5 hash for the file is "3982908442F37245B305EDCF4D834494" Private Sub Button3_Click(sender As System.Object, e As System.EventArgs) Handles Button3.Click dim md5code as string OpenFileDialog1.ShowDialog() Dim md5 As MD5CryptoServiceProvider = New

can i use the function md5_file to name files when upload without having conflict with names?

由 笑着哭i 提交于 2019-12-12 19:08:02
问题 all the idea i need to be sure that the file doesn't saved more than one time and don't lose any file because if tow files get the same (md5) the second file will not saved (my goal don't save the same file Twice on hard disk) In other words, if one user upload image and after that another user upload the same image i need to don't save the the second image because it's already exist in the hard disk all of this because i need to save space on my hard disk this is my code it works fine

Will md5(file_contents_as_string) equal md5_file(/path/to/file)?

由 扶醉桌前 提交于 2019-12-05 08:34:54
问题 If I do: <?php echo md5(file_get_contents("/path/to/file")) ?> ...will this always produce the same hash as: <?php echo md5_file("/path/to/file") ?> 回答1: Yes they return the same: var_dump(md5(file_get_contents(__FILE__))); var_dump(md5_file(__FILE__)); which returns this in my case: string(32) "4d2aec3ae83694513cb9bde0617deeea" string(32) "4d2aec3ae83694513cb9bde0617deeea" Edit: Take a look at the source code of both functions: https://github.com/php/php-src/blob/master/ext/standard/md5.c

Will md5(file_contents_as_string) equal md5_file(/path/to/file)?

由 早过忘川 提交于 2019-12-03 22:08:05
If I do: <?php echo md5(file_get_contents("/path/to/file")) ?> ...will this always produce the same hash as: <?php echo md5_file("/path/to/file") ?> Yes they return the same: var_dump(md5(file_get_contents(__FILE__))); var_dump(md5_file(__FILE__)); which returns this in my case: string(32) "4d2aec3ae83694513cb9bde0617deeea" string(32) "4d2aec3ae83694513cb9bde0617deeea" Edit: Take a look at the source code of both functions: https://github.com/php/php-src/blob/master/ext/standard/md5.c (Line 47 & 76). They both use the same functions to generate the hash except that the md5_file() function

C# calculate MD5 for opened file?

由 浪尽此生 提交于 2019-12-03 07:07:57
how I can calculate MD5 hash for a file that is open or used by a process? the files can be txt or and exe my current code return error for an exe because it is running here is my current code public static string GetMd5HashFromFile(string fileName) { FileStream file = new FileStream(fileName, FileMode.Open); MD5 md5 = new MD5CryptoServiceProvider(); byte[] retVal = md5.ComputeHash(file); file.Close(); StringBuilder sb = new StringBuilder(); for (int i = 0; i < retVal.Length; i++) { sb.Append(retVal[i].ToString("x2")); } return sb.ToString(); } Cheers. Try opening the file as read-only:

hash css and js files to break cache. Is it slow?

由 你。 提交于 2019-11-28 06:03:25
问题 I have some script that generates templates of a page. Also, this scripts renders <script> and <link rel='stylesheet'> tags in the HTML. I'd like to add cache-breaking feature with "?v=xxxxx" parameter. I do it in such a way: foreach ($scripts as &$script) { // get script file name $script = "{$this->_js_folder}/{$script}"; // get it's realpath $realfile = realpath(substr($script,1)); // hashing the file $hash = md5_file($realfile); // adding cache-breaking number $script .= '?v='.$hash; } //

How can I read/stream a file without loading the entire file into memory?

由 和自甴很熟 提交于 2019-11-27 01:45:49
How can I read an arbitrary file and process it "piece by piece" (meaning byte by byte or some other chunk size that would give the best read performance) without loading the entire file into memory? An example of processing would be to generate an MD5 hash of the file although the answer could apply to any operation. I'd like to have or write this but if I can get existing code that would be great too. (c#) Here's an example of how to read a file in chunks of 1KB without loading the entire contents into memory: const int chunkSize = 1024; // read the file by chunks of 1KB using (var file =

How can I read/stream a file without loading the entire file into memory?

由 五迷三道 提交于 2019-11-26 12:28:30
问题 How can I read an arbitrary file and process it \"piece by piece\" (meaning byte by byte or some other chunk size that would give the best read performance) without loading the entire file into memory? An example of processing would be to generate an MD5 hash of the file although the answer could apply to any operation. I\'d like to have or write this but if I can get existing code that would be great too. (c#) 回答1: Here's an example of how to read a file in chunks of 1KB without loading the
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