feat: namespace and cmake support

CMakeLists.txt

@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 3.5)
+project(md5sum LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 11)
+
+add_library(md5sum STATIC md5.cc md5_impl.cc)

main.cc

@@ -1,10 +0,0 @@
-#include <iostream>
-#include "md5sum.h"
-
-int main() {
-    auto ret = md5sum("dnomd343");
-    std::cout << ret << std::endl;
-
-    auto val = md5file("/Users/jucong.lin/klotski/third_party/md5sum/343.txt");
-    std::cout << val << std::endl;
-}

md5.cc

@@ -1,9 +1,11 @@
 #include "md5sum.h"
 #include "md5def.h"
 
+namespace md5 {
+
 static char hb2hex(uint8_t hb) {
     hb &= 0xF;
-    return hb < 10 ? '0' + hb : hb - 10 + 'a';
+    return char(hb < 10 ? hb + '0' : hb - 10 + 'a');
 }
 
 std::string md5sum(const std::string &dat) {
@@ -33,8 +35,8 @@ std::string md5file(std::FILE *file) {
 	MD5_CTX c;
     md5_init(&c);
 
+    size_t len;
 	uint8_t out[16];
-	size_t len = 0;
     char buff[BUFSIZ];
 	while ((len = std::fread(buff, sizeof(char), BUFSIZ, file)) > 0) {
 		md5_update(&c, buff, len);
@@ -48,3 +50,5 @@ std::string md5file(std::FILE *file) {
     }
 	return res;
 }
+
+} // namespace md5

md5_impl.cc

@@ -23,6 +23,8 @@
 #define GET(n) (ctx->block[(n)])
 #endif
 
+namespace md5 {
+
 static const void* md5_body(MD5_CTX *ctx, const void *data, uint32_t size) {
     const auto *ptr = (uint8_t*)data;
 
@@ -208,3 +210,5 @@ void md5_bin(const void *dat, size_t len, uint8_t out[16]) {
     md5_update(&c, dat, len);
     md5_final(out, &c);
 }
+
+} // namespace md5

md5def.h

@@ -1,5 +1,7 @@
 #pragma once
 
+namespace md5 {
+
 typedef struct {
     uint32_t lo, hi;
     uint32_t a, b, c, d;
@@ -11,3 +13,5 @@ void md5_init(MD5_CTX *ctx);
 void md5_final(uint8_t *result, MD5_CTX *ctx);
 void md5_update(MD5_CTX *ctx, const void *data, uint32_t size);
 void md5_bin(const void *dat, size_t len, uint8_t out[16]);
+
+} // namespace md5

md5sum.h

@@ -1,12 +1,13 @@
-#ifndef MD5_H
+#pragma once
-#define MD5_H
 
 #include <string>
 
+namespace md5 {
+
 std::string md5sum(const std::string &dat);
 std::string md5sum(const void *dat, size_t len);
 
 std::string md5file(std::FILE *file);
 std::string md5file(const char *filename);
 
-#endif // end of MD5_H
+} // namespace md5