Travel3: Simple image and video display site

Reads the images and videos from filesystem and builds a site in
memroy.

1 files changed, 29 insertions, 0 deletions

diff --git a/src/ro_buffer.cc b/src/ro_buffer.cc
new file mode 100644
index 0000000..ee6208e
--- /dev/null
+++ b/src/ro_buffer.cc
@@ -0,0 +1,29 @@
+#include "common.hh"
+
+#include "ro_buffer.hh"
+
+#include <algorithm>
+
+size_t RoBuffer::read(RoBuffer* buf, void* data, size_t len) {
+  assert(buf);
+  assert(data);
+  if (len == 0)
+    return 0;
+  auto* d = reinterpret_cast<char*>(data);
+  size_t got = 0;
+  while (true) {
+    size_t avail;
+    auto want = len - got;
+    auto* ptr = buf->rbuf(want, avail);
+    if (avail == 0)
+      return got;
+    if (avail >= want) {
+      std::copy_n(ptr, want, d + got);
+      buf->rcommit(want);
+      return len;
+    }
+    std::copy_n(ptr, avail, d + got);
+    buf->rcommit(avail);
+    got += avail;
+  }
+}