From fce68dc8f39dfceab3e80513390bae8fa936a6b9 Mon Sep 17 00:00:00 2001
From: Mattes D <github@xoft.cz>
Date: Fri, 1 Jan 2016 16:42:22 +0100
Subject: Added HTTPResponseParser.

---
 src/HTTPServer/HTTPResponseParser.cpp | 177 ++++++++++++++++++++++++++++++++++
 1 file changed, 177 insertions(+)
 create mode 100644 src/HTTPServer/HTTPResponseParser.cpp

(limited to 'src/HTTPServer/HTTPResponseParser.cpp')

diff --git a/src/HTTPServer/HTTPResponseParser.cpp b/src/HTTPServer/HTTPResponseParser.cpp
new file mode 100644
index 000000000..b3ce9dab6
--- /dev/null
+++ b/src/HTTPServer/HTTPResponseParser.cpp
@@ -0,0 +1,177 @@
+
+// HTTPResponseParser.cpp
+
+// Implements the cHTTPResponseParser class representing the parser for incoming HTTP responses
+
+#include "Globals.h"
+#include "HTTPResponseParser.h"
+
+
+
+
+
+cHTTPResponseParser::cHTTPResponseParser(cHTTPResponseParser::cCallbacks & a_Callbacks):
+	Super(mkResponse),
+	m_Callbacks(a_Callbacks),
+	m_IsInHeaders(true),
+	m_IsFinished(false),
+	m_EnvelopeParser(*this)
+{
+}
+
+
+
+
+
+size_t cHTTPResponseParser::Parse(const char * a_Data, size_t a_Size)
+{
+	// If parsing already finished or errorred, let the caller keep all the data:
+	if (m_IsFinished || m_HasHadError)
+	{
+		return a_Size;
+	}
+
+	// If still waiting for the status line, add to buffer and try parsing it:
+	if (m_StatusLine.empty())
+	{
+		m_Buffer.append(a_Data, a_Size);
+		if (!ParseStatusLine())
+		{
+			// All data used, but not a complete status line yet.
+			return 0;
+		}
+		if (m_HasHadError)
+		{
+			return AString::npos;
+		}
+		// Status line completed, feed the rest of the buffer into the envelope parser:
+		auto bytesConsumed = m_EnvelopeParser.Parse(m_Buffer.data(), m_Buffer.size());
+		if (bytesConsumed == AString::npos)
+		{
+			m_HasHadError = true;
+			m_Callbacks.OnError("Failed to parse the envelope");
+			return AString::npos;
+		}
+		m_Buffer.erase(0, bytesConsumed);
+		if (!m_Buffer.empty())
+		{
+			// Headers finished and there's still data left in the buffer, process it as message body:
+			m_IsInHeaders = false;
+			return ParseBody(m_Buffer.data(), m_Buffer.size());
+		}
+		return 0;
+	}  // if (m_StatusLine.empty())
+
+	// If still parsing headers, send them to the envelope parser:
+	if (m_IsInHeaders)
+	{
+		auto bytesConsumed = m_EnvelopeParser.Parse(a_Data, a_Size);
+		if (bytesConsumed == AString::npos)
+		{
+			m_HasHadError = true;
+			m_Callbacks.OnError("Failed to parse the envelope");
+			return AString::npos;
+		}
+		if (bytesConsumed < a_Size)
+		{
+			// Headers finished and there's still data left in the buffer, process it as message body:
+			HeadersFinished();
+			return ParseBody(a_Data + bytesConsumed, a_Size - bytesConsumed);
+		}
+		return 0;
+	}
+
+	// Already parsing the body
+	return ParseBody(a_Data, a_Size);
+}
+
+
+
+
+
+bool cHTTPResponseParser::ParseStatusLine(void)
+{
+	auto idxLineEnd = m_Buffer.find("\r\n");
+	if (idxLineEnd == AString::npos)
+	{
+		// Not a complete line yet
+		return false;
+	}
+	m_StatusLine = m_Buffer.substr(0, idxLineEnd);
+	m_Buffer.erase(0, idxLineEnd + 2);
+	m_Callbacks.OnStatusLine(m_StatusLine);
+	return true;
+}
+
+
+
+
+size_t cHTTPResponseParser::ParseBody(const char * a_Data, size_t a_Size)
+{
+	if (m_TransferEncodingParser == nullptr)
+	{
+		// We have no Transfer-encoding parser assigned. This should have happened when finishing the envelope
+		return AString::npos;
+	}
+
+	// Parse the body using the transfer encoding parser:
+	return m_TransferEncodingParser->Parse(a_Data, a_Size);
+}
+
+
+
+
+
+void cHTTPResponseParser::HeadersFinished(void)
+{
+	m_IsInHeaders = false;
+	m_Callbacks.OnHeadersFinished();
+
+	auto transferEncoding = m_Headers.find("transfer-encoding");
+	if (transferEncoding == m_Headers.end())
+	{
+		m_TransferEncodingParser = cTransferEncodingParser::Create(*this, "identity", m_ContentLength);
+	}
+}
+
+
+
+
+
+void cHTTPResponseParser::OnHeaderLine(const AString & a_Key, const AString & a_Value)
+{
+	AddHeader(a_Key, a_Value);
+	m_Callbacks.OnHeaderLine(a_Key, a_Value);
+}
+
+
+
+
+
+void cHTTPResponseParser::OnError(const AString & a_ErrorDescription)
+{
+	m_HasHadError = true;
+	m_Callbacks.OnError(a_ErrorDescription);
+}
+
+
+
+
+
+void cHTTPResponseParser::OnBodyData(const void * a_Data, size_t a_Size)
+{
+	m_Callbacks.OnBodyData(a_Data, a_Size);
+}
+
+
+
+
+
+void cHTTPResponseParser::OnBodyFinished(void)
+{
+	m_Callbacks.OnBodyFinished();
+}
+
+
+
+
-- 
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