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authorMichael Krelin <hacker@klever.net>2011-08-30 20:04:30 (UTC)
committer Michael Krelin <hacker@klever.net>2011-08-30 20:04:30 (UTC)
commit111044b60ba5f40e003d1ba1d4082794985aa3ad (patch) (side-by-side diff)
treece7949dad0cded81f47f7f067b43d2c29a795067
parent09b6e86aaad70bc7488604b2e291d098a7de0eac (diff)
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introduce incremental md5 digester
Signed-off-by: Michael Krelin <hacker@klever.net>
Diffstat (more/less context) (show whitespace changes)
-rw-r--r--src/eyetil.cc14
-rw-r--r--src/eyetil.h37
2 files changed, 51 insertions, 0 deletions
diff --git a/src/eyetil.cc b/src/eyetil.cc
index 7669cb6..57ae607 100644
--- a/src/eyetil.cc
+++ b/src/eyetil.cc
@@ -72,2 +72,16 @@ binary_t binary_t::md5() const {
+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;
+}
+
+
static void make_path_for_template(const std::string& p,mode_t m) {
diff --git a/src/eyetil.h b/src/eyetil.h
index d946e71..eff2c43 100644
--- a/src/eyetil.h
+++ b/src/eyetil.h
@@ -7,2 +7,3 @@
#include <archive_entry.h>
+#include "openssl/md5.h"
@@ -23,2 +24,38 @@ class binary_t : public std::vector<unsigned char> {
+struct md5_digester {
+ MD5_CTX ctx;
+ md5_digester() { init(); }
+
+ void init();
+ void update(const void *d,size_t l);
+ binary_t final();
+
+ template<typename T>
+ void update(const T& x) { update(&x,sizeof(x)); }
+
+ template<typename T>
+ struct update_iterator : public std::iterator<std::output_iterator_tag,T,void,T*,T&> {
+ md5_digester *d;
+ update_iterator(md5_digester *d_) : d(d_) { }
+ update_iterator(const update_iterator& x) : d(x.d) { }
+
+ update_iterator& operator*() { return *this; }
+ update_iterator& operator++() { return *this; }
+ update_iterator& operator++(int) { return *this; }
+
+ update_iterator& operator=(const T& x) {
+ d->update(x); return *this;
+ }
+ };
+
+ 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());
+}
+
class tmpdir_t {