testdata: use Go generate to produce test files

Author: dsnet

testdata/huffman.go

@@ -4,6 +4,8 @@
 
 // +build ignore
 
+//go:generate go run huffman.go
+
 // Generates huffman.txt. This test file heavily favors prefix based encodings
 // since some symbols are heavily favored over others. This leads to compression
 // savings that can be gained by assigning shorter prefix codes to those more

testdata/random.go

@@ -4,6 +4,8 @@
 
 // +build ignore
 
+//go:generate go run random.go
+
 // Generates random.bin. This test file contains random data throughout and
 // tests the worst case compression scenario.
 package main

testdata/repeats.go

@@ -4,6 +4,8 @@
 
 // +build ignore
 
+//go:generate go run repeats.go
+
 // Generates repeats.bin. This test file heavily favors LZ77 based compression
 // since a large bulk of its data is a copy from some distance ago. Also, since
 // the source data is mostly random, prefix encoding does not benefit as much.

testdata/zeros.go

@@ -4,6 +4,8 @@
 
 // +build ignore
 
+//go:generate go run zeros.go
+
 // Generates zeros.bin. This test file contains zeroed data throughout and
 // tests the best case compression scenario.
 package main