240 lines
6.6 KiB
C++
240 lines
6.6 KiB
C++
//
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// MODULE: APGTSQRY.CPP
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//
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// PURPOSE: Implementation file for PTS Query Parser
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// Fully implements class CHttpQuery, parsing out NAME=VALUE pairs from HTTP query string
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//
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// PROJECT: Generic Troubleshooter DLL for Microsoft AnswerPoint
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//
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// COMPANY: Saltmine Creative, Inc. (206)-284-7511 support@saltmine.com
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//
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// AUTHOR: Roman Mach
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//
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// ORIGINAL DATE: 8-2-96
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//
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// NOTES:
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// 1. Based on Print Troubleshooter DLL
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// 2. Caller is responsible to assure that all buffers passed in are large enough
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//
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// Version Date By Comments
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//--------------------------------------------------------------------
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// V0.1 - RM Original
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// V3.1 12/17/98 JM Major cleanup, add Push capablity
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//
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#pragma warning(disable:4786)
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#include "stdafx.h"
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#include "apgts.h"
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#include "apgtscls.h"
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//
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//
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CHttpQuery::CHttpQuery() :
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m_state(ST_GETDATA),
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m_nIndex(0)
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{
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}
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//
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//
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CHttpQuery::~CHttpQuery()
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{
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}
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//
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// INPUT *szInput - this is the URL-encoded query string in which we are searching
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// INPUT *pchName - must point to a buffer of size MAXBUF
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// OUTPUT *pchName - Typically NAME of a NAME=VALUE pair. Any URL-encoding stripped out.
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// Null-terminated. Leading and trailing blanks stripped.
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// INPUT *pchValue - must point to a buffer of size MAXBUF
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// OUTPUT *pchValue - Typically VALUE of a NAME=VALUE pair. Any URL-encoding stripped out.
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// Null-terminated. Leading and trailing blanks stripped.
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// RETURN - TRUE ==> more data to come
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BOOL CHttpQuery::GetFirst(LPCTSTR szInput, TCHAR *pchName, TCHAR *pchValue)
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{
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m_state = ST_GETDATA;
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m_strInput = szInput;
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m_nIndex = 0;
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BOOL status = LoopFind(pchName, pchValue);
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CleanStr(pchName);
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CleanStr(pchValue);
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return (status);
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}
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// Called after a call to CHttpQuery::GetFirst or to this fn has returned true
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// INPUT *pchName - must point to a buffer of size MAXBUF
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// OUTPUT *pchName - Typically NAME of a NAME=VALUE pair
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// Null-terminated. Leading and trailing blanks stripped.
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// INPUT *pchValue - must point to a buffer of size MAXBUF
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// OUTPUT *pchValue - Typically VALUE of a NAME=VALUE pair
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// Null-terminated. Leading and trailing blanks stripped.
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// RETURN - TRUE ==> more data to come
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BOOL CHttpQuery::GetNext(TCHAR *pchName, TCHAR *pchValue)
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{
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BOOL status = LoopFind(pchName, pchValue);
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CleanStr(pchName);
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CleanStr(pchValue);
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return (status);
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}
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// put new content on the front of the unparsed portion of the query string in which we are
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// searching.
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// Typically, szPushed should consist of 1 or more NAME=VALUE pairs, each terminated by an
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// ampersand ("&").
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void CHttpQuery::Push(LPCTSTR szPushed)
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{
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m_state = ST_GETDATA;
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m_strInput = CString(szPushed) + m_strInput.Mid(m_nIndex);
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m_nIndex = 0;
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}
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//
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// RETURN - TRUE ==> more data to come
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// INPUT *pchName - must point to a buffer of size MAXBUF
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// OUTPUT *pchName - Typically NAME of a NAME=VALUE pair. Any URL-encoding stripped out.
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// Null-terminated. May have leading and/or trailing blanks
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// INPUT *pchValue - must point to a buffer of size MAXBUF
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// OUTPUT *pchValue - Typically VALUE of a NAME=VALUE pair. Any URL-encoding stripped out.
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// Null-terminated. May have leading and/or trailing blanks
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BOOL CHttpQuery::LoopFind(TCHAR *pchName, TCHAR *pchValue)
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{
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*pchName = NULL;
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*pchValue = NULL;
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TCHAR ch;
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int val, oldval = 0;
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TCHAR temp[20]; // a way bigger buffer than we need
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TCHAR *pchPut; // initially points to pchName but can change to point to pchValue
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int nLength = m_strInput.GetLength();
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if (m_nIndex >= nLength)
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return (FALSE);
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pchPut = pchName;
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while (m_nIndex < nLength)
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{
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ch = m_strInput[m_nIndex++]; // You might think something related to _tcsinc()
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// would be called for to advance m_nIndex. You'd be wrong,
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// although the choice would be harmless.
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// URL-encoding keeps us within the ASCII character set, so no double-
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// byte issues should arise. Besides that, the strings passed in to the
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// command line of the troubleshooter controls are even further
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// constrained: for example, even in a Japanese-language topic, node
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// names will be ASCII.
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switch(m_state) {
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case ST_GETDATA:
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if (ch == _T('&'))
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// expect another NAME=VALUE pair
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return (TRUE);
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else if (ch == _T('=')) {
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// Got a name, expect a value
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pchPut = pchValue;
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break;
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}
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else if (ch == _T('%'))
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// expect to be followed by 2-digit hex
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m_state = ST_DECODEHEX1;
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else if (ch == _T('+'))
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// encoded blank
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AddBuffer(_T(' '),pchPut);
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else
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AddBuffer(ch,pchPut);
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break;
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case ST_DECODEHEX1:
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// first of 2 hex digits
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temp[0] = ch;
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m_state = ST_DECODEHEX2;
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break;
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case ST_DECODEHEX2:
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// second of 2 hex digits; parse it into a hex value & affix it to *pchPut
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temp[1] = ch;
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temp[2] = 0;
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_stscanf(temp,_T("%02X"),&val);
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// reinterpret CR, LF, or CRLF as '\n'
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if (val == 0x0A) {
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if (oldval != 0x0D)
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AddBuffer(_T('\n'),pchPut);
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}
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else if (val == 0x0D)
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AddBuffer(_T('\n'),pchPut);
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else
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AddBuffer( static_cast<TCHAR>(val), pchPut );
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oldval = val;
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m_state = ST_GETDATA;
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break;
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default:
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return (FALSE);
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}
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}
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return (TRUE);
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}
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//
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// append ch to *tostr, with a few subtleties: see comments in body of routine
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void CHttpQuery::AddBuffer( TCHAR ch, TCHAR *tostr)
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{
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if (ch == _T('\t'))
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// TAB -> 4 blanks
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PutStr(_T(" "),tostr);
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else if (ch == _T('\n'))
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// blank before newline
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PutStr(_T(" \n"),tostr);
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else if (ch == _T('<'))
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// html: must encrypt left angle bracket.
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PutStr(_T("<"),tostr);
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else if (ch == _T('>'))
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// html: must encrypt right angle bracket.
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PutStr(_T(">"),tostr);
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else if (ch > 0x7E || ch < 0x20)
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// refuse DEL, NUL, and control characters
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return;
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else {
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TCHAR temp[2];
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temp[0] = ch;
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temp[1] = _T('\0');
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PutStr(temp,tostr);
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}
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}
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// append string *addtostr to string *instr up to a maximum size of MAXBUF-1
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// INPUT/OUTPUT *instr
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// INPUT *addtostr
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// NOTE that this fails silently if total lengths exceed MAXBUF-1 chars
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void CHttpQuery::PutStr(LPCTSTR instr, TCHAR *addtostr)
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{
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if ((_tcslen(instr)+_tcslen(addtostr)) >= (MAXBUF-1)) {
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// can't add it to buff
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return;
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}
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_tcscat(addtostr,instr);
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}
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// Acts upon INPUT/OUTPUT *str - strip any leading control characters and spaces,
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// turn any other control characters and spaces into '\0's
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/* static */ void CHttpQuery::CleanStr(TCHAR *str)
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{
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TCHAR temp[MAXBUF], *ptr;
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int len;
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ptr = str;
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while (*ptr > _T('\0') && *ptr <= _T(' '))
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ptr = _tcsinc(ptr);
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_tcscpy(temp,ptr);
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if ((len = _tcslen(temp))!=0) {
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ptr = &temp[len-1];
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while (ptr > temp) {
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if (*ptr > _T('\0') && *ptr <= _T(' '))
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*ptr = _T('\0');
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else
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break;
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ptr = _tcsdec(temp, ptr);
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}
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}
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_tcscpy(str,temp);
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} |