1 files changed, 162 insertions, 0 deletions
diff --git a/src/libevent_util.cc b/src/libevent_util.cc
new file mode 100644
index 0000000..3b60b6d
--- /dev/null
+++ b/src/libevent_util.cc
@@ -0,0 +1,162 @@
+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2014 Tatsuhiro Tsujikawa
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#include "libevent_util.h"
+
+#include <cstring>
+#include <algorithm>
+
+namespace nghttp2 {
+
+namespace util {
+
+EvbufferBuffer::EvbufferBuffer()
+    : evbuffer_(nullptr),
+      bucket_(nullptr),
+      buf_(nullptr),
+      bufmax_(0),
+      buflen_(0),
+      limit_(0),
+      writelen_(0) {}
+
+EvbufferBuffer::EvbufferBuffer(evbuffer *evbuffer, uint8_t *buf, size_t bufmax,
+                               ssize_t limit)
+    : evbuffer_(evbuffer),
+      bucket_(limit == -1 ? nullptr : evbuffer_new()),
+      buf_(buf),
+      bufmax_(bufmax),
+      buflen_(0),
+      limit_(limit),
+      writelen_(0) {}
+
+void EvbufferBuffer::reset(evbuffer *evbuffer, uint8_t *buf, size_t bufmax,
+                           ssize_t limit) {
+  evbuffer_ = evbuffer;
+  buf_ = buf;
+  if (limit != -1 && !bucket_) {
+    bucket_ = evbuffer_new();
+  }
+  bufmax_ = bufmax;
+  buflen_ = 0;
+  limit_ = limit;
+  writelen_ = 0;
+}
+
+EvbufferBuffer::~EvbufferBuffer() {
+  if (bucket_) {
+    evbuffer_free(bucket_);
+  }
+}
+
+int EvbufferBuffer::write_buffer() {
+  for (auto pos = buf_, end = buf_ + buflen_; pos < end;) {
+    // To avoid merging chunks in evbuffer, we first add to temporal
+    // buffer bucket_ and then move its chain to evbuffer_.
+    auto nwrite = std::min(end - pos, limit_);
+    auto rv = evbuffer_add(bucket_, pos, nwrite);
+    if (rv == -1) {
+      return -1;
+    }
+    rv = evbuffer_add_buffer(evbuffer_, bucket_);
+    if (rv == -1) {
+      return -1;
+    }
+    pos += nwrite;
+  }
+  return 0;
+}
+
+int EvbufferBuffer::flush() {
+  int rv;
+  if (buflen_ > 0) {
+    if (limit_ == -1) {
+      rv = evbuffer_add(evbuffer_, buf_, buflen_);
+    } else {
+      rv = write_buffer();
+    }
+    if (rv == -1) {
+      return -1;
+    }
+    writelen_ += buflen_;
+    buflen_ = 0;
+  }
+  return 0;
+}
+
+int EvbufferBuffer::add(const uint8_t *data, size_t datalen) {
+  int rv;
+  if (buflen_ + datalen > bufmax_) {
+    if (buflen_ > 0) {
+      if (limit_ == -1) {
+        rv = evbuffer_add(evbuffer_, buf_, buflen_);
+      } else {
+        rv = write_buffer();
+      }
+      if (rv == -1) {
+        return -1;
+      }
+      writelen_ += buflen_;
+      buflen_ = 0;
+    }
+    if (datalen > bufmax_) {
+      if (limit_ == -1) {
+        rv = evbuffer_add(evbuffer_, data, datalen);
+      } else {
+        rv = write_buffer();
+      }
+      if (rv == -1) {
+        return -1;
+      }
+      writelen_ += buflen_;
+      return 0;
+    }
+  }
+  memcpy(buf_ + buflen_, data, datalen);
+  buflen_ += datalen;
+  return 0;
+}
+
+size_t EvbufferBuffer::get_buflen() const { return buflen_; }
+
+size_t EvbufferBuffer::get_writelen() const { return writelen_; }
+
+void bev_enable_unless(bufferevent *bev, int events) {
+  if ((bufferevent_get_enabled(bev) & events) == events) {
+    return;
+  }
+
+  bufferevent_enable(bev, events);
+}
+
+void bev_disable_unless(bufferevent *bev, int events) {
+  if ((bufferevent_get_enabled(bev) & events) == 0) {
+    return;
+  }
+
+  bufferevent_disable(bev, events);
+}
+
+} // namespace util
+
+} // namespace nghttp2