digitalmars.D.learn - Proper way to work with huge binary files
- C (8/8) Jan 24 2012 Hello all.
- Justin Whear (4/14) Jan 24 2012 std.stream has a BufferedStream class which doesn't care whether the
- Jonathan M Davis (13/23) Jan 24 2012 You'd probably just use std.stdio.File's byChunk with std.md5.MD5_CTX.
Hello all. After a quick recce on the main D site I couldn't find a how-to for large binary files. Suppose I'm using an old machine with limited memory, and I want to compute the MD5 hash of a 4 GB file. Do I need to buffer the input as in C++? And how should I check for exceptions? Example code much appreciated. Thank you for reading.
Jan 24 2012
On Tue, 24 Jan 2012 15:53:48 +0000, C wrote:Hello all. After a quick recce on the main D site I couldn't find a how-to for large binary files. Suppose I'm using an old machine with limited memory, and I want to compute the MD5 hash of a 4 GB file. Do I need to buffer the input as in C++? And how should I check for exceptions? Example code much appreciated. Thank you for reading.std.stream has a BufferedStream class which doesn't care whether the underlying stream is text or binary. I'd start there. Justin
Jan 24 2012
On Tuesday, January 24, 2012 15:53:48 C wrote:Hello all. After a quick recce on the main D site I couldn't find a how-to for large binary files. Suppose I'm using an old machine with limited memory, and I want to compute the MD5 hash of a 4 GB file. Do I need to buffer the input as in C++? And how should I check for exceptions? Example code much appreciated. Thank you for reading.You'd probably just use std.stdio.File's byChunk with std.md5.MD5_CTX. Something like MD5_CTX md5; md5.start(); auto file = File(filename); foreach(ubyte[] buffer; file.byChunk(4096)) md5.update(buffer); ubyte[16] result; md5.finish(result); I've never used std.md5 though, so I'm just going by the docs on how to use it. - Jonathan M Davis
Jan 24 2012