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// --------------------------------------------------------------------------
//
// File
// Name: HTTPQueryDecoder.cpp
// Purpose: Utility class to decode HTTP query strings
// Created: 26/3/04
//
// --------------------------------------------------------------------------
#include "Box.h"
#include <stdlib.h>
#include "HTTPQueryDecoder.h"
#include "MemLeakFindOn.h"
// --------------------------------------------------------------------------
//
// Function
// Name: HTTPQueryDecoder::HTTPQueryDecoder(
// HTTPRequest::Query_t &)
// Purpose: Constructor. Pass in the query contents you want
// to decode the query string into.
// Created: 26/3/04
//
// --------------------------------------------------------------------------
HTTPQueryDecoder::HTTPQueryDecoder(HTTPRequest::Query_t &rDecodeInto)
: mrDecodeInto(rDecodeInto),
mInKey(true),
mEscapedState(0)
{
// Insert the terminator for escaped characters
mEscaped[2] = '\0';
}
// --------------------------------------------------------------------------
//
// Function
// Name: HTTPQueryDecoder::~HTTPQueryDecoder()
// Purpose: Destructor.
// Created: 26/3/04
//
// --------------------------------------------------------------------------
HTTPQueryDecoder::~HTTPQueryDecoder()
{
}
// --------------------------------------------------------------------------
//
// Function
// Name: HTTPQueryDecoder::Decode(const char *, int)
// Purpose: Decode a chunk of query string -- call several times with
// the bits as they are received, and then call Finish()
// Created: 26/3/04
//
// --------------------------------------------------------------------------
void HTTPQueryDecoder::DecodeChunk(const char *pQueryString, int QueryStringSize)
{
for(int l = 0; l < QueryStringSize; ++l)
{
char c = pQueryString[l];
// BEFORE unescaping, check to see if we need to flip key / value
if(mEscapedState == 0)
{
if(mInKey && c == '=')
{
// Set to store characters in the value
mInKey = false;
continue;
}
else if(!mInKey && c == '&')
{
// Need to store the current key/value pair
mrDecodeInto.insert(HTTPRequest::QueryEn_t(mCurrentKey, mCurrentValue));
// Blank the strings
mCurrentKey.erase();
mCurrentValue.erase();
// Set to store characters in the key
mInKey = true;
continue;
}
}
// Decode an escaped value?
if(mEscapedState == 1)
{
// Waiting for char one of the escaped hex value
mEscaped[0] = c;
mEscapedState = 2;
continue;
}
else if(mEscapedState == 2)
{
// Escaped value, decode it
mEscaped[1] = c; // str terminated in constructor
mEscapedState = 0; // stop being in escaped mode
long ch = ::strtol(mEscaped, NULL, 16);
if(ch <= 0 || ch > 255)
{
// Bad character, just ignore
continue;
}
// Use this instead
c = (char)ch;
}
else if(c == '+')
{
c = ' ';
}
else if(c == '%')
{
mEscapedState = 1;
continue;
}
// Store decoded value into the appropriate string
if(mInKey)
{
mCurrentKey += c;
}
else
{
mCurrentValue += c;
}
}
// Don't do anything here with left over values, DecodeChunk might be called
// again. Let Finish() clean up.
}
// --------------------------------------------------------------------------
//
// Function
// Name: HTTPQueryDecoder::Finish()
// Purpose: Finish the decoding. Necessary to get the last item!
// Created: 26/3/04
//
// --------------------------------------------------------------------------
void HTTPQueryDecoder::Finish()
{
// Insert any remaining value.
if(!mCurrentKey.empty())
{
mrDecodeInto.insert(HTTPRequest::QueryEn_t(mCurrentKey, mCurrentValue));
// Blank values, just in case
mCurrentKey.erase();
mCurrentValue.erase();
}
}
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