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Task/Bitmap-Read-a-PPM-file/Nim/bitmap-read-a-ppm-file.nim

@@ -0,0 +1,33 @@
+import strutils
+
+proc readPPM(f: TFile): Image =
+  if f.readLine != "P6":
+    raise newException(E_base, "Invalid file format")
+
+  var line = ""
+  while f.readLine(line):
+    if line[0] != '#':
+      break
+
+  var parts = line.split(" ")
+  result = img(parseInt parts[0], parseInt parts[1])
+
+  if f.readLine != "255":
+    raise newException(E_base, "Invalid file format")
+
+  var
+    arr: array[256, int8]
+    read = f.readBytes(arr, 0, 256)
+    pos = 0
+
+  while read != 0:
+    for i in 0 .. < read:
+      case pos mod 3
+      of 0: result.pixels[pos div 3].r = arr[i].uint8
+      of 1: result.pixels[pos div 3].g = arr[i].uint8
+      of 2: result.pixels[pos div 3].b = arr[i].uint8
+      else: discard
+
+      inc pos
+
+    read = f.readBytes(arr, 0, 256)