moved tcp checksum calculation to header

Signed-off-by: Michael Krelin <hacker@klever.net>

2 files changed, 16 insertions, 13 deletions

diff --git a/src/eyetil.cc b/src/eyetil.cc
index 11e2fb7..cd22eea 100644
--- a/src/eyetil.cc
+++ b/src/eyetil.cc
@@ -74,24 +74,29 @@ void md5_digester::init() {
     if(!MD5_Init(&ctx)) throw std::runtime_error("failed to MD5_Init()");
 }
 void md5_digester::update(const void *d,size_t l) {
     if(!MD5_Update(&ctx,d,l)) throw std::runtime_error("failed to MD5_Update()");
 }
 binary_t md5_digester::final() {
     binary_t rv(MD5_DIGEST_LENGTH);
     if(!MD5_Final((unsigned char*)&(rv.front()), &ctx))
         throw std::runtime_error("failed to MD5_Final()");
     return rv;
 }
 
+uint16_t block512_t::tcpcksum(block512_t& data) {
+    uint32_t sum = std::accumulate(data.data,data.data+words,0);
+    while(uint32_t hw = sum>>16) sum = (sum&0xffff)+hw;
+    return 0xffff&~sum;
+}
 
 static void make_path_for_template(const std::string& p,mode_t m) {
     struct stat st;
     std::string pp;
     for(std::string::size_type sl=p.find('/',1);
             sl!=std::string::npos;
             sl=p.find('/',sl+1)) {
         if(stat( (pp=p.substr(0,sl)).c_str() ,&st)
                 || !S_ISDIR(st.st_mode)) {
             if(mkdir(pp.c_str(),m))
                 throw std::runtime_error("failed to mkdir()");
         }
@@ -141,33 +146,20 @@ bool tarchive_t::read_next_header() {
 }
 
 std::string tarchive_t::entry_pathname() {
     assert(a); assert(e);
     return archive_entry_pathname(e);
 }
 
 bool tarchive_t::read_data_into_fd(int fd) {
     assert(a);
     return archive_read_data_into_fd(a,fd)==ARCHIVE_OK;
 }
 
-#pragma pack(1)
-struct block512_t {
-    enum { words = 512 / sizeof(uint16_t) };
-    uint16_t data[words];
-
-    static uint16_t tcpcksum(block512_t& data) {
-        uint32_t sum = std::accumulate(data.data,data.data+words,0);
-        while(uint32_t hw = sum>>16) sum = (sum&0xffff)+hw;
-        return 0xffff&~sum;
-    }
-
-};
-#pragma pack()
 
 binary_t integrity_digest(const void *ptr,size_t size,const std::string& ukey) {
     md5_digester rv;
     std::transform( (block512_t*)ptr, ((block512_t*)ptr)+size/sizeof(block512_t),
             rv.updater<uint16_t>(), block512_t::tcpcksum );
     rv.update( binary_t(ukey) );
     return rv.final();
 }
diff --git a/src/eyetil.h b/src/eyetil.h
index 03b9ba8..7517ba6 100644
--- a/src/eyetil.h
+++ b/src/eyetil.h
@@ -54,24 +54,35 @@ struct md5_digester {
     };
 
     template<typename T>
     update_iterator<T> updater() {
         return update_iterator<T>(this);
     }
 
 };
 template<> inline void md5_digester::update<binary_t>(const binary_t& x) {
     update((const unsigned char*)&(x.front()),x.size());
 }
 
+#pragma pack(1)
+struct block512_t {
+    enum { words = 512 / sizeof(uint16_t) };
+    uint16_t data[words];
+
+    inline uint8_t *dptr(size_t o) { return ((uint8_t*)this)+o; }
+
+    static uint16_t tcpcksum(block512_t& data);
+};
+#pragma pack()
+
 class tmpdir_t {
     public:
         std::string dir;
 
         tmpdir_t(const std::string& dt);
         ~tmpdir_t();
 
         std::string get_file(const std::string& f);
 };
 
 class tarchive_t {
     public: