feat: Add gzstd anz gunzstd executables as examples

.gitignore

@@ -1,3 +1,7 @@
 .DS_Store
 *_test
 *.dSYM
+/gzstd
+/gunzstd
+LICENSE.z
+LICENSE.uz

.vscode/settings.json

@@ -3,7 +3,9 @@
     "**/.git": true,
     "**/.DS_Store": true,
     "**/*_test": true,
-    "**/*.dSYM": true
+    "**/*.dSYM": true,
+    "gzstd": true,
+    "gunzstd": true
   },
   "search.exclude": {
     "**/node_modules": true

Makefile

@@ -1,11 +1,20 @@
-all: check test
+ifeq (1,${RELEASE})
+	VFLAGS=-prod
+endif
+
+all: check build test
 
 check:
 	v fmt -w .
 	v vet .
 
+build:
+	v $(VFLAGS) -o gzstd cmd/gzstd/gzstd.v
+	v $(VFLAGS) -o gunzstd cmd/gunzstd/gunzstd.v
+
 test:
-	v test .
+	v -use-os-system-to-run test .
+	./test.sh
 
 clean:
-	rm -rf src/*_test src/*.dSYM
+	rm -rf src/*_test src/*.dSYM gzstd gunzstd

cmd/gunzstd/gunzstd.v

@@ -0,0 +1,77 @@
+module main
+
+import os { create, exists, open, rm }
+import zstd { DecompressContext, StreamContext, new_decompress_context, new_decompress_stream_context }
+
+fn decompress(in_name string, dctx &DecompressContext, mut sctx StreamContext, mut buf []u8) ! {
+	dctx.reset(zstd.ResetDir.session_only)
+
+	mut in_file := open(in_name)!
+	defer {
+		in_file.close()
+	}
+
+	out_name := if in_name.ends_with('.z') {
+		name := in_name[..in_name.len - 2]
+		if exists(name) {
+			'${name}.uz'
+		} else {
+			name
+		}
+	} else {
+		'${in_name}.uz'
+	}
+	mut out_file := create(out_name)!
+	defer {
+		out_file.close()
+	}
+	mut out_file_ref := &out_file
+
+	drain := fn [mut out_file_ref] (buf &u8, len int) ! {
+		unsafe { out_file_ref.write_full_buffer(buf, usize(len))! }
+	}
+	abort := fn [out_name, mut out_file_ref] () {
+		out_file_ref.close()
+		rm(out_name) or { eprintln('cleanup failed: ${err.msg()}') }
+	}
+
+	for {
+		len := in_file.read_into_ptr(buf.data, buf.len) or {
+			abort()
+			return err
+		}
+		last := len < buf.len
+		unsafe {
+			dctx.decompress_chunk_at(mut sctx, buf.data, len, last, drain) or {
+				abort()
+				return err
+			}
+		}
+		if last {
+			break
+		}
+	}
+}
+
+fn main() {
+	if os.args.len < 2 {
+		eprintln('name of file to decompress missing')
+		exit(1)
+	}
+
+	dctx := new_decompress_context()!
+	defer {
+		dctx.free()
+	}
+	mut sctx := new_decompress_stream_context()
+	mut buf := []u8{len: zstd.decompress_stream_in_size}
+
+	for i in 1 .. os.args.len {
+		name := os.args[i]
+		if _ := decompress(name, dctx, mut sctx, mut buf) {
+			println('${name} decompressed')
+		} else {
+			println('${name} failed: ${err.msg()}')
+		}
+	}
+}

cmd/gzstd/gzstd.v

@@ -0,0 +1,69 @@
+module main
+
+import os { create, open, rm }
+import zstd { CompressContext, CompressParam, StreamContext, new_compress_context, new_compress_stream_context }
+
+fn compress(in_name string, cctx &CompressContext, mut sctx StreamContext, mut buf []u8) ! {
+	cctx.reset(zstd.ResetDir.session_only)
+
+	mut in_file := open(in_name)!
+	defer {
+		in_file.close()
+	}
+
+	out_name := '${in_name}.z'
+	mut out_file := create(out_name)!
+	defer {
+		out_file.close()
+	}
+	mut out_file_ref := &out_file
+
+	drain := fn [mut out_file_ref] (buf &u8, len int) ! {
+		unsafe { out_file_ref.write_full_buffer(buf, usize(len))! }
+	}
+	abort := fn [out_name, mut out_file_ref] () {
+		out_file_ref.close()
+		rm(out_name) or { eprintln('cleanup failed: ${err.msg()}') }
+	}
+
+	for {
+		len := in_file.read_into_ptr(buf.data, buf.len) or {
+			abort()
+			return err
+		}
+		last := len < buf.len
+		unsafe {
+			cctx.compress_chunk_at(mut sctx, buf.data, len, last, drain) or {
+				abort()
+				return err
+			}
+		}
+		if last {
+			break
+		}
+	}
+}
+
+fn main() {
+	if os.args.len < 2 {
+		eprintln('name of file to compress missing')
+		exit(1)
+	}
+
+	cctx := new_compress_context()!
+	defer {
+		cctx.free()
+	}
+	cctx.set_param(CompressParam.checksum_flag, 1)!
+	mut sctx := new_compress_stream_context()
+	mut buf := []u8{len: zstd.compress_stream_in_size}
+
+	for i in 1 .. os.args.len {
+		name := os.args[i]
+		if _ := compress(name, cctx, mut sctx, mut buf) {
+			println('${name} compressed')
+		} else {
+			println('${name} failed: ${err.msg()}')
+		}
+	}
+}

make.bat

@@ -1 +1,2 @@
-v test .
+v -prod -o gzstd cmd/gzstd/gzstd.v
+v -prod -o gunzstd cmd/gunzstd/gunzstd.v

test.sh

@@ -0,0 +1,35 @@
+#!/bin/sh
+
+set -e
+
+test() {
+  if [ "$2" != "" ]; then
+    echo "----------------------------------------"
+  fi
+  echo "$1"
+  echo "----------------------------------------"
+}
+
+test "compress"
+./gzstd LICENSE
+if [ ! -f "LICENSE.z" ]; then
+  echo "archive not compressed"
+  exit 1
+fi
+
+test "decompress"
+./gunzstd LICENSE.z
+if [ ! -f "LICENSE.uz" ]; then
+  echo "archive not decompressed"
+  exit 1
+fi
+
+test "compare"
+diff LICENSE LICENSE.uz
+if [ $? -ne 0 ]; then
+  exit 1
+fi
+
+rm LICENSE.z LICENSE.uz
+
+echo "done"