Reduced memory consumption on network level.

src/base/net/tools/LineReader.cpp

@@ -0,0 +1,103 @@
+/* XMRig
+ * Copyright 2018-2020 SChernykh   <https://github.com/SChernykh>
+ * Copyright 2016-2020 XMRig       <https://github.com/xmrig>, <support@xmrig.com>
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#include "base/net/tools/LineReader.h"
+#include "base/net/tools/NetBuffer.h"
+#include "base/kernel/interfaces/ILineListener.h"
+
+#include <cassert>
+#include <cstring>
+
+
+xmrig::LineReader::~LineReader()
+{
+    NetBuffer::release(m_buf);
+}
+
+
+void xmrig::LineReader::parse(char *data, size_t size)
+{
+    assert(m_listener != nullptr && size > 0);
+    if (!m_listener || size == 0) {
+        return;
+    }
+
+    if (!m_buf) {
+        return getline(data, size);
+    }
+
+    add(data, size);
+    getline(m_buf, m_pos);
+}
+
+
+void xmrig::LineReader::reset()
+{
+    if (m_buf) {
+        NetBuffer::release(m_buf);
+        m_buf = nullptr;
+        m_pos = 0;
+    }
+}
+
+
+void xmrig::LineReader::add(const char *data, size_t size)
+{
+    if (size > NetBuffer::kChunkSize - m_pos) {
+        return;
+    }
+
+    if (!m_buf) {
+        m_buf = NetBuffer::allocate();
+        m_pos = 0;
+    }
+
+    memcpy(m_buf + m_pos, data, size);
+    m_pos += size;
+}
+
+
+void xmrig::LineReader::getline(char *data, size_t size)
+{
+    char *end        = nullptr;
+    char *start      = data;
+    size_t remaining = size;
+
+    while ((end = static_cast<char*>(memchr(start, '\n', remaining))) != nullptr) {
+        *end = '\0';
+
+        end++;
+
+        const auto len = static_cast<size_t>(end - start);
+        if (len > 1) {
+            m_listener->onLine(start, len - 1);
+        }
+
+        remaining -= len;
+        start = end;
+    }
+
+    if (remaining == 0) {
+        return reset();
+    }
+
+    if (!m_buf || m_buf != data) {
+        add(start, remaining);
+    }
+}