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-rw-r--r--source/HTTPServer/MultipartParser.cpp256
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diff --git a/source/HTTPServer/MultipartParser.cpp b/source/HTTPServer/MultipartParser.cpp
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+
+// MultipartParser.cpp
+
+// Implements the cMultipartParser class that parses messages in "multipart/*" encoding into the separate parts
+
+#include "Globals.h"
+#include "MultipartParser.h"
+#include "NameValueParser.h"
+
+
+
+
+
+// Disable MSVC warnings:
+#if defined(_MSC_VER)
+ #pragma warning(push)
+ #pragma warning(disable:4355) // 'this' : used in base member initializer list
+#endif
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// self-test:
+
+#if 0
+
+class cMultipartParserTest :
+ public cMultipartParser::cCallbacks
+{
+public:
+ cMultipartParserTest(void)
+ {
+ cMultipartParser Parser("multipart/mixed; boundary=\"MyBoundaryString\"; foo=bar", *this);
+ const char Data[] =
+"ThisIsIgnoredPrologue\r\n\
+--MyBoundaryString\r\n\
+\r\n\
+Body with confusing strings\r\n\
+--NotABoundary\r\n\
+--MyBoundaryStringWithPostfix\r\n\
+--\r\n\
+--MyBoundaryString\r\n\
+content-disposition: inline\r\n\
+\r\n\
+This is body\r\n\
+--MyBoundaryString\r\n\
+\r\n\
+Headerless body with trailing CRLF\r\n\
+\r\n\
+--MyBoundaryString--\r\n\
+ThisIsIgnoredEpilogue";
+ printf("Multipart parsing test commencing.\n");
+ Parser.Parse(Data, sizeof(Data) - 1);
+ // DEBUG: Check if the onscreen output corresponds with the data above
+ printf("Multipart parsing test finished\n");
+ }
+
+ virtual void OnPartStart(void) override
+ {
+ printf("Starting a new part\n");
+ }
+
+
+ virtual void OnPartHeader(const AString & a_Key, const AString & a_Value) override
+ {
+ printf(" Hdr: \"%s\"=\"%s\"\n", a_Key.c_str(), a_Value.c_str());
+ }
+
+
+ virtual void OnPartData(const char * a_Data, int a_Size) override
+ {
+ printf(" Data: %d bytes, \"%.*s\"\n", a_Size, a_Size, a_Data);
+ }
+
+
+ virtual void OnPartEnd(void) override
+ {
+ printf("Part end\n");
+ }
+} g_Test;
+
+#endif
+
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cMultipartParser:
+
+
+cMultipartParser::cMultipartParser(const AString & a_ContentType, cCallbacks & a_Callbacks) :
+ m_Callbacks(a_Callbacks),
+ m_IsValid(true),
+ m_EnvelopeParser(*this),
+ m_HasHadData(false)
+{
+ static AString s_Multipart = "multipart/";
+
+ // Check that the content type is multipart:
+ AString ContentType(a_ContentType);
+ if (strncmp(ContentType.c_str(), "multipart/", 10) != 0)
+ {
+ m_IsValid = false;
+ return;
+ }
+ size_t idxSC = ContentType.find(';', 10);
+ if (idxSC == AString::npos)
+ {
+ m_IsValid = false;
+ return;
+ }
+
+ // Find the multipart boundary:
+ ContentType.erase(0, idxSC + 1);
+ cNameValueParser CTParser(ContentType.c_str(), ContentType.size());
+ CTParser.Finish();
+ if (!CTParser.IsValid())
+ {
+ m_IsValid = false;
+ return;
+ }
+ m_Boundary = CTParser["boundary"];
+ m_IsValid = !m_Boundary.empty();
+ if (!m_IsValid)
+ {
+ return;
+ }
+
+ // Set the envelope parser for parsing the body, so that our Parse() function parses the ignored prefix data as a body
+ m_EnvelopeParser.SetIsInHeaders(false);
+
+ // Append an initial CRLF to the incoming data, so that a body starting with the boundary line will get caught
+ m_IncomingData.assign("\r\n");
+
+ /*
+ m_Boundary = AString("\r\n--") + m_Boundary
+ m_BoundaryEnd = m_Boundary + "--\r\n";
+ m_Boundary = m_Boundary + "\r\n";
+ */
+}
+
+
+
+
+
+void cMultipartParser::Parse(const char * a_Data, int a_Size)
+{
+ // Skip parsing if invalid
+ if (!m_IsValid)
+ {
+ return;
+ }
+
+ // Append to buffer, then parse it:
+ m_IncomingData.append(a_Data, a_Size);
+ while (true)
+ {
+ if (m_EnvelopeParser.IsInHeaders())
+ {
+ int BytesConsumed = m_EnvelopeParser.Parse(m_IncomingData.data(), m_IncomingData.size());
+ if (BytesConsumed < 0)
+ {
+ m_IsValid = false;
+ return;
+ }
+ if ((BytesConsumed == a_Size) && m_EnvelopeParser.IsInHeaders())
+ {
+ // All the incoming data has been consumed and still waiting for more
+ return;
+ }
+ m_IncomingData.erase(0, BytesConsumed);
+ }
+
+ // Search for boundary / boundary end:
+ size_t idxBoundary = m_IncomingData.find("\r\n--");
+ if (idxBoundary == AString::npos)
+ {
+ // Boundary string start not present, present as much data to the part callback as possible
+ if (m_IncomingData.size() > m_Boundary.size() + 8)
+ {
+ size_t BytesToReport = m_IncomingData.size() - m_Boundary.size() - 8;
+ m_Callbacks.OnPartData(m_IncomingData.data(), BytesToReport);
+ m_IncomingData.erase(0, BytesToReport);
+ }
+ return;
+ }
+ if (idxBoundary > 0)
+ {
+ m_Callbacks.OnPartData(m_IncomingData.data(), idxBoundary);
+ m_IncomingData.erase(0, idxBoundary);
+ }
+ idxBoundary = 4;
+ size_t LineEnd = m_IncomingData.find("\r\n", idxBoundary);
+ if (LineEnd == AString::npos)
+ {
+ // Not a complete line yet, present as much data to the part callback as possible
+ if (m_IncomingData.size() > m_Boundary.size() + 8)
+ {
+ size_t BytesToReport = m_IncomingData.size() - m_Boundary.size() - 8;
+ m_Callbacks.OnPartData(m_IncomingData.data(), BytesToReport);
+ m_IncomingData.erase(0, BytesToReport);
+ }
+ return;
+ }
+ if (
+ (LineEnd - idxBoundary != m_Boundary.size()) && // Line length not equal to boundary
+ (LineEnd - idxBoundary != m_Boundary.size() + 2) // Line length not equal to boundary end
+ )
+ {
+ // Got a line, but it's not a boundary, report it as data:
+ m_Callbacks.OnPartData(m_IncomingData.data(), LineEnd);
+ m_IncomingData.erase(0, LineEnd);
+ continue;
+ }
+
+ if (strncmp(m_IncomingData.c_str() + idxBoundary, m_Boundary.c_str(), m_Boundary.size()) == 0)
+ {
+ // Boundary or BoundaryEnd found:
+ m_Callbacks.OnPartEnd();
+ size_t idxSlash = idxBoundary + m_Boundary.size();
+ if ((m_IncomingData[idxSlash] == '-') && (m_IncomingData[idxSlash + 1] == '-'))
+ {
+ // This was the last part
+ m_Callbacks.OnPartData(m_IncomingData.data() + idxSlash + 4, m_IncomingData.size() - idxSlash - 4);
+ m_IncomingData.clear();
+ return;
+ }
+ m_Callbacks.OnPartStart();
+ m_IncomingData.erase(0, LineEnd + 2);
+
+ // Keep parsing for the headers that may have come with this data:
+ m_EnvelopeParser.Reset();
+ continue;
+ }
+
+ // It's a line, but not a boundary. It can be fully sent to the data receiver, since a boundary cannot cross lines
+ m_Callbacks.OnPartData(m_IncomingData.c_str(), LineEnd);
+ m_IncomingData.erase(0, LineEnd);
+ } // while (true)
+}
+
+
+
+
+
+void cMultipartParser::OnHeaderLine(const AString & a_Key, const AString & a_Value)
+{
+ m_Callbacks.OnPartHeader(a_Key, a_Value);
+}
+
+
+
+