From 6232d13f5321b87ddf12a1aa36b4545da45f173d Mon Sep 17 00:00:00 2001
From: Joel Klinghed <the_jk@spawned.biz>
Date: Wed, 17 Nov 2021 22:34:57 +0100
Subject: Travel3: Simple image and video display site

Reads the images and videos from filesystem and builds a site in
memroy.
---
 src/hasher.cc | 71 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 src/hasher.cc

(limited to 'src/hasher.cc')

diff --git a/src/hasher.cc b/src/hasher.cc
new file mode 100644
index 0000000..dd94ce4
--- /dev/null
+++ b/src/hasher.cc
@@ -0,0 +1,71 @@
+#include "common.hh"
+
+#include "hash_method.hh"
+#include "hasher.hh"
+#include "io.hh"
+#include "logger.hh"
+#include "task_runner.hh"
+
+#include <errno.h>
+#include <string.h>
+
+namespace {
+
+class HasherImpl : public Hasher {
+public:
+  HasherImpl(std::shared_ptr<Logger> logger,
+             std::shared_ptr<TaskRunner> runner,
+             size_t threads)
+    : logger_(std::move(logger)), runner_(std::move(runner)),
+      workers_(TaskRunner::create(threads)) {
+  }
+
+  void hash(std::filesystem::path path,
+            std::function<void(std::string, uint64_t)> callback) override {
+    workers_->post(std::bind(&HasherImpl::do_hash, this, path, callback));
+  }
+
+private:
+  void do_hash(std::filesystem::path path,
+               std::function<void(std::string, uint64_t)> callback) {
+    auto fd = io::open(path, io::open_flags::rdonly);
+    std::string result;
+    uint64_t size = 0;
+    if (fd) {
+      auto method = HashMethod::sha256();
+      char buffer[1 * 1024 * 1024];
+      while (true) {
+        auto got = io::read(fd.get(), buffer, sizeof(buffer));
+        if (got < 0) {
+          logger_->warn("Error reading: %s: %s", path.c_str(),
+                        strerror(errno));
+          size = 0;
+          break;
+        }
+        if (got == 0) {
+          result = method->finish();
+          break;
+        }
+        size += got;
+        method->update(buffer, got);
+      }
+    } else {
+      logger_->warn("Unable to open: %s: %s", path.c_str(),
+                    strerror(errno));
+    }
+    runner_->post(std::bind(callback, result, size));
+  }
+
+  std::shared_ptr<Logger> logger_;
+  std::shared_ptr<TaskRunner> runner_;
+  std::unique_ptr<TaskRunner> workers_;
+};
+
+}  // namespace
+
+std::unique_ptr<Hasher> Hasher::create(std::shared_ptr<Logger> logger,
+                                       std::shared_ptr<TaskRunner> runner,
+                                       size_t threads) {
+  return std::make_unique<HasherImpl>(std::move(logger), std::move(runner),
+                                      threads);
+}
-- 
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