I want to compute hash value of file, to check if the file content has changed.
I have Array-list holding lines of files as element of list. Now I want to compute the Hash value of it.
Is the Hash value best for it to check if the file is modified or not ?
I have code to MD5 string in VB.Net, but i want convert it to php with same value return
VB.Net Code :
Public Shared Function ConverFileName(ByVal FileName As String) As String Dim str2 As String = "" Dim provider As New MD5CryptoServiceProvider Try Dim buffer As Byte() = provider.ComputeHash(Encoding.Default.GetBytes(FileName)) Dim num2 As Integer = (buffer.Length - 1) Dim i As Integer = 0 Do While (i <= num2) str2 = (str2 & StringType.FromByte(buffer(i))) i += 1 Loop Catch exception1 As Exception ProjectData.SetProjectError(exception1) Dim exception As Exception = exception1 ProjectData.ClearProjectError End Try Return str2 End Function
I am woring with a numpy's 1d array with thousands of uint64 numbers in python 2.7. What is the fastest way to calculate the md5 of every number individually?
Each number has to be converted to string before calling the md5 function. I read in many places that iterating over numpy's arrays and doing stuff in pure python is dead slow. Is there any way to circumvent that?
I am using the REST PUT BLOB API for Microsoft AZUREIt is indicated at https://docs.microsoft.com/en-us/rest/api/storageservices/put-blob :"When omitted in version 2012-02-12 and later, the Blob Service Generates an MD5 hash."
I use "x-ms-version" = "2019-02-02"The uploaded file is automatically encoded with an MD5 hash !It is also different from the uploaded file.How to avoid this?I think this is a parameter to specify ...Thanks
Computing md5 needs a stream of bytes to pass through. I'm assuming it is possible to intercept csv.writer as a stream of bytes while a million rows are written. In below py code, a million rows are written, how do I compute md5 without reading the file into memory just for md5?
def query2csv(connection, fileUri, sqlQuery, args): import csv tocsvfile = open(fileUri, 'w+') writer = csv.writer(tocsvfile, delimiter=',', quotechar='"') # , quoting=csv.QUOTE_MINIMAL #As a huge blob goes into writer, pass through, md5 how? # I do not want to read the huge file through memory just to compute md5 with connection.cursor() as cur: cur.execute(sqlQuery, args) column_names = list(map(lambda x: x, cur.description)) writer.writerow(column_names) writer.writerows(__batch_rows(cur))