MD5 streaming implementation.

src/main/nim/wdiwtlt/incremental_md5.nim

@@ -0,0 +1,39 @@
+import std/[paths, streams]
+import checksums/md5
+
+proc fileToMD5*(filename: Path) : string =
+
+  const blockSize: int = 8192 # read files in 8KB chunnks
+  var
+    c: MD5Context
+    d: MD5Digest
+    fs: FileStream
+    buffer: string
+
+  #read chunk of file, calling update until all bytes have been read
+  try:
+    fs = newFileStream(open($filename))
+
+    md5Init(c)
+    buffer = fs.readStr(blockSize)
+
+    while buffer.len > 0:
+      md5Update(c, buffer.cstring, buffer.len)
+      buffer = fs.readStr(blockSize)
+
+    md5Final(c, d)
+
+  finally:
+    if fs != nil:
+      close(fs)
+
+  result = $d
+
+when isMainModule:
+
+  if paramCount() > 0:
+    let arguments = commandLineParams()
+    echo("MD5: ", fileToMD5(arguments[0]))
+  else:
+    echo("Must pass filename.")
+    quit(-1)

wdiwtlt.nimble

@@ -11,7 +11,7 @@ bin           = @["wdiwtlt"]
 # Dependencies
 
 requires "nim >= 2.2.0"
-requires @["mpv", "nimterop", "uuids", "waterpark"]
+requires @["checksums", "mpv", "nimterop", "taglib", "uuids", "waterpark"]
 
 # Dependencies from https://git.jdb-software.com/jdb/nim-packages
 requires @["db_migrate", "fiber_orm"]