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windows-server-2003/admin/activec/shellext/xmlfile.cpp

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/*--------------------------------------------------------------------------*
*
* Microsoft Windows
* Copyright (C) Microsoft Corporation, 1999 - 1999
*
* File: xmlfile.cpp
*
* Contents: Implements extracting console icon from XML file
*
* History: 17-Dec-99 audriusz Created
*
*--------------------------------------------------------------------------*/
#include "stdafx.h"
#include "shlobj.h"
#include "Extract.h"
#include "base64.h"
#include "xmlfile.h"
#include "strings.h"
//---------------------------------------------------------------------------
// static (private) implementation helpers used thru this file
//---------------------------------------------------------------------------
static bool FindStringInData( LPCSTR &pstrSource, int nBytesPerChar, DWORD &dwCharsLeft, LPCSTR pstrKey);
static HRESULT DecodeBase64Fragment( LPCSTR &pstrSource, int nBytesPerChar, DWORD &dwCharsLeft, HGLOBAL& hgResult);
static HRESULT FindAndReadIconData(LPCSTR &pstrSource, int nBytesPerChar, DWORD &dwCharsLeft, LPCSTR strIconName, HGLOBAL& hglobIcon);
static HRESULT LoadIconFromHGlobal(HGLOBAL hData, HICON& hIcon);
static HRESULT ValidateXMLDocument(LPCSTR &pFileData, DWORD &dwLen, int *piBytesPerEnglishChar = NULL);
// following function is a friend of class CXMLPersistableIcon. If renaming, take this into accnt
static HRESULT LoadIconFromXMLData(LPCSTR pFileData, DWORD dwLen, CPersistableIcon &persistableIcon);
/***************************************************************************\
*
* FUNCTION: FindStringInData
*
* PURPOSE: This function locates the string in provided data
* NOTE - it matches first byte only (codepage of UNICODE string is ignored)
*
* PARAMETERS:
* LPCSTR &pstrSource - [in/out] - data to search thru / possition
* of the first char following the found match
* int nBytesPerChar - [in] - width of the character
* ( only the first byte of each character will be examined )
* DWORD &dwCharsLeft - [in/out] - init. data len / data left after matching string
* LPCSTR pstrKey - [in] - substring to search
*
* RETURNS:
* bool - true if succeeded
*
\***************************************************************************/
// Following sample illustrates algorithm used for the search.
// we will try to locate "Console" in the string "Microsoft Management Console"
//------------------------------------------------
// Standard search (a la strstr)
//------------------------------------------------
// 1.
// Microsoft Management Console
// Console <- comparing (fails - move to the next char)
// 2.
// Microsoft Management Console
// Console <- comparing (fails - move to the next char)
// ------------------------ (19 steps skipped)
// 22.
// Console <- comparing (succeeds)
//------------------------------------------------
// More inteligent search
//------------------------------------------------
// 1. ! <- last char in searched seq
// Microsoft Management Console
// Console <- comparing (fails - last char in searched seq is 'o';
// and 'o' is 3rd character from the end in the key;
// so we can advance by 2 chars to match it)
// 2. ! <- matching 'o' to last 'o' in the key
// Microsoft Management Console
// Console <- comparing (fails - last char in searched seq is 't';
// 't' is not in the key
// so we can advance by key length (7 chars) to skip it)
// 3. ! <- pos following the last char in searched seq
// Microsoft Management Console
// Console <- comparing (fails - last char in searched seq is 'e';
// 'e' is last character in the key;
// we still can advance by key length (7 chars) to skip it)
// 4. ! <- pos following the last char in searched seq
// Microsoft Management Console
// Console <- comparing (fails)
// 5. ! <- match point
// Microsoft Management Console
// Console <- comparing (fails)
// 6. ! <- match point
// Microsoft Management Console
// Console <- comparing (succeeds)
//------------------------------------------------
static bool
FindStringInData( LPCSTR &pstrSource, int nBytesPerChar, DWORD &dwCharsLeft, LPCSTR pstrKey)
{
// check parameters
if( (!pstrSource) || (!pstrKey) )
return false;
typedef unsigned short KeyLen_t;
static KeyLen_t nKeyDist[256]; // static - to keep stack small
// calculate the key length
DWORD dwKeyLen = strlen(pstrKey);
// test for empty search key
if (!dwKeyLen)
return true; // we always match empty strings
// test for longer search key than data provided
if (dwKeyLen > dwCharsLeft)
return false; // we'll never find longer substrings than the source
// key length var size is not too big to minimize tho lookup table size
KeyLen_t nKeyLen = (KeyLen_t)dwKeyLen;
// recheck here if the key isn't too long
if ((DWORD)nKeyLen != dwKeyLen) // key len does not fit to our variable -
return false; // we do not deel with such a long keys
// form the table holding minimal character distance from the end of pstrKey
// It is used for increasing search speed:
// When key does not match at current location, [instead of trying one location ahead,]
// algorythm checks the last character in sequence tested with a key (data[keylen-1]).
// now we check how far this character may be from the end of the key - we will have
// distance of all key length in case character is not a part of the key.
// we can safelly advance by that much. Sometimes we'll be positioning the key at whole
// key_len offsets from previous test position, sometimes less - depending on data.
// initialize the table. The distance is keylen value for all characters not existing in the key
for (unsigned i = 0; i < sizeof(nKeyDist)/sizeof(nKeyDist[0]); ++i)
nKeyDist[i] = nKeyLen;
// now set minimal distance for characters in the key.
// Note, that the last character is not included intensionally - to make
// distance to it equal to whole key length
for (i = 0; i < nKeyLen - 1; ++i)
nKeyDist[pstrKey[i]] = nKeyLen - (KeyLen_t)i - 1;
// we are done with initialization. Time for real work.
LPCSTR p = pstrSource; // to speed it up: we use local variables
DWORD dwLeft = dwCharsLeft;
while ( 1 )
{
// set the pointers to start of inspected sequence
LPCSTR ke = pstrKey; // pointer to evaluating key char
LPCSTR pe = p; // pointer to evaluating source char
// try to match all characters in the key
KeyLen_t nToMatch = nKeyLen;
while ( *pe == *ke )
{
--nToMatch;
pe += nBytesPerChar;
++ke;
// inspect if there still are some chars to match
if (!nToMatch)
{
// we return the possitive answer here
// change the reference parameters accordingly
// (pointing right after the string found)
pstrSource = pe;
dwCharsLeft = dwLeft - nKeyLen;
return true;
}
}
// chLastChar is used as an index
// need to cast the char to unsigned char - else it will
// not work correctly for values over 127
// NTRAID#NTBUG9-185761-2000/09/18 AUDRIUSZ
BYTE chLastChar = p[(nKeyLen - 1) * nBytesPerChar]; // the last char from evaluated source range
// the key couldn't be found at the position we inspected.
// we can advance source pointer as far as we can match
// the position of the last character to any entry in the key
// or whole key length else.
// We have a table built for that
const KeyLen_t nToSkip = nKeyDist[chLastChar];
if ((DWORD)nToSkip + (DWORD)nKeyLen >= dwLeft)
return false; // gone too far... ( couldn't find the match )
p += (nToSkip * nBytesPerChar);
dwLeft -= nToSkip;
}
// we will not get here anyway...
return false;
}
/***************************************************************************\
*
* METHOD: DecodeBase64Fragment
*
* PURPOSE: decodes base64 data fragment pointed by arguments
*
* PARAMETERS:
* LPCSTR &pstrSource - [in/out] - data to decode / possition
* of the first char following the decoded data
* int nBytesPerChar - [in] - width of the character
* ( only the first byte of each character will be examined )
* DWORD &dwCharsLeft - [in/out] - init. data len / data left after skipping converted
* HGLOBAL& hgResult - decoded data
*
* RETURNS:
* HRESULT - result code
*
\***************************************************************************/
static HRESULT
DecodeBase64Fragment( LPCSTR &pstrSource, int nBytesPerChar, DWORD &dwCharsLeft, HGLOBAL& hgResult)
{
HRESULT hrStatus = S_OK;
LPCSTR p = pstrSource;
DWORD dwLeft = dwCharsLeft;
const size_t ICON_ALLOCATION_LEN = 8*1024; // big enough to have 1 allocation in most cases
LPBYTE pDynamicBuffer = NULL;
LPBYTE pConversionBuffer = NULL;
size_t nCharsInDynamicBuffer = 0;
size_t nDynamicBufferCapacity = 0;
HGLOBAL hGlobAlloc = NULL;
ASSERT(hResult == NULL);
static base64_table conv;
// convert until done or end is found
while (1)
{
// standard conversion. converts 4 chars (6bit each) to 3 bytes
BYTE inp[4];
memset(&inp, 0 ,sizeof(inp));
// collect 4 characters for conversion, if possible.
for (int nChars = 0; nChars < 4 && dwLeft && *p != '<' && *p != '='; --dwLeft)
{
BYTE bt = conv.map2six(*p);
p += nBytesPerChar;
if (bt != 0xff)
inp[nChars++] = bt;
}
// if nothing to convert - we are done
if (!nChars)
break;
// make sure we have enough storage for result
if (nChars + nCharsInDynamicBuffer > nDynamicBufferCapacity)
{
// need to extend the dynamic buffer
LPBYTE pnewBuffer = (LPBYTE)realloc(pDynamicBuffer, nDynamicBufferCapacity + ICON_ALLOCATION_LEN);
if (!pnewBuffer)
{
hrStatus = E_OUTOFMEMORY;
goto ON_ERROR;
}
// assign new pointer
pDynamicBuffer = pnewBuffer;
nDynamicBufferCapacity += ICON_ALLOCATION_LEN;
pConversionBuffer = &pDynamicBuffer[nCharsInDynamicBuffer];
}
// decode and put the staff to the memory;
int nCharsPut = conv.decode4(inp, nChars, pConversionBuffer);
// update count & current pointer
nCharsInDynamicBuffer += nCharsPut;
pConversionBuffer += nCharsPut;
}
// allocate the buffer and store the result data
// The same buffer is not reused for conversion, because
// it's assumed to be saffer to load icon from stream, containing only
// as much data as required ( we would have larger buffer, containing some
// uninitialized data at the end if returning buffer used for conversion)
hGlobAlloc = GlobalAlloc(GMEM_MOVEABLE, nCharsInDynamicBuffer);
if (hGlobAlloc == NULL)
{
hrStatus = E_OUTOFMEMORY;
goto ON_ERROR;
}
// if we have characters, copy them to result
if (nCharsInDynamicBuffer)
{
LPVOID pResultStorage = GlobalLock(hGlobAlloc);
if (pResultStorage == NULL)
{
hrStatus = E_OUTOFMEMORY;
goto ON_ERROR;
}
memcpy(pResultStorage, pDynamicBuffer, nCharsInDynamicBuffer);
GlobalUnlock(hGlobAlloc);
}
// assign the memory handle to caller
hgResult = hGlobAlloc;
hGlobAlloc = NULL; // assign null to avoid releasing it
// adjust poiters to start from where we finished the next time
pstrSource = p;
dwCharsLeft = dwLeft;
hrStatus = S_OK;
ON_ERROR: // note: ok result falls thru as well
if (hGlobAlloc)
GlobalFree(hGlobAlloc);
if (pDynamicBuffer)
free(pDynamicBuffer);
return hrStatus;
}
/***************************************************************************\
*
* METHOD: FindAndReadIconData
*
* PURPOSE: Function locates Icon data in the xml file data and loads it into HGLOBAL
*
* PARAMETERS:
* LPCSTR &pstrSource - [in/out] - data to look thru / possition
* of the first char following the decoded icon data
* int nBytesPerChar - [in] - width of the character
* ( only the first byte of each character will be examined )
* DWORD &dwCharsLeft - [in/out] - init. data len / data left after skipping decoded
* LPCSTR strIconName - [in] name of Icon to locate
* - NOTE: it assumes icon data to be a base64-encoded stream, saved
* as contents of XML element, having IconName as its attribute
* HGLOBAL& hglobIcon - [out] - memory block containing icon data
*
* RETURNS:
* HRESULT - result code
*
\***************************************************************************/
static HRESULT FindAndReadIconData(LPCSTR &pstrSource, int nBytesPerChar, DWORD &dwCharsLeft, LPCSTR strIconName, HGLOBAL& hglobIcon)
{
ASSERT(hglobIcon == NULL); // we do not free data here, pass null handler!
// make local vars for efficiency
DWORD dwLen = dwCharsLeft;
LPCSTR pstrData = pstrSource;
// locate the string with the name of icon (assume it's unique enough)
const bool bIconFound = FindStringInData( pstrData, nBytesPerChar, dwLen, strIconName);
if (!bIconFound)
return E_FAIL;
// now locate the end of tag '>' ( start of the contents )
const bool bStartFound = FindStringInData( pstrData, nBytesPerChar, dwLen, ">" );
if (!bStartFound)
return E_FAIL;
HRESULT hr = DecodeBase64Fragment( pstrData, nBytesPerChar, dwLen, hglobIcon);
if (FAILED(hr))
return hr;
// update pointers to start from where we finished the next time
dwCharsLeft = dwLen;
pstrSource = pstrData;
return S_OK;
}
/***************************************************************************\
*
* METHOD: LoadIconFromHGlobal
*
* PURPOSE: Function extracts HICON from stream contained in HGLOBAL
*
* PARAMETERS:
* HGLOBAL hData [in] - data to load from
* HICON& hIcon [out] - read icon
*
* RETURNS:
* HRESULT - result code
*
\***************************************************************************/
static HRESULT LoadIconFromHGlobal(HGLOBAL hData, HICON& hIcon)
{
HRESULT hr = S_OK;
// create the stream
IStreamPtr spStream;
hr = CreateStreamOnHGlobal(hData, FALSE/*do not release*/, &spStream);
if (FAILED(hr))
return hr;
// read the icon as image list
HIMAGELIST himl = ImageList_Read (spStream);
if (!himl)
return E_FAIL;
// retrieve icon from image list
hIcon = ImageList_GetIcon (himl, 0, ILD_NORMAL);
// destroy image list (no longer need it)
ImageList_Destroy (himl);
return S_OK;
}
/***************************************************************************\
*
* METHOD: LoadIconFromXMLData
*
* PURPOSE: Loads icon from memory containing file data of XML document
*
* PARAMETERS:
* LPCSTR pFileData - file data suspected to contain XML document
* DWORD dwLen - the len of input data
* CPersistableIcon &persistableIcon - Icon to initialize upon successful loading
*
* RETURNS:
* HRESULT - result code (S_OK - icon loaded, error code else)
*
\***************************************************************************/
static HRESULT LoadIconFromXMLData(LPCSTR pFileData, DWORD dwLen, CPersistableIcon &persistableIcon)
{
HRESULT hr = S_OK;
int nBytesPerChar = 0;
// check if we recognize the document contents
hr = ValidateXMLDocument(pFileData,dwLen, &nBytesPerChar);
if (hr != S_OK) // hr == S_FALSE means format is not recognized
return E_FAIL;
// Get required keywords.
USES_CONVERSION;
LPCSTR lpcstrLarge = T2CA(XML_ATTR_CONSOLE_ICON_LARGE);
LPCSTR lpcstrSmall = T2CA(XML_ATTR_CONSOLE_ICON_SMALL);
HICON hLargeIcon = NULL;
HICON hSmallIcon = NULL;
// try to read large icon first
HGLOBAL hgLargeIcon = NULL;
hr = FindAndReadIconData(pFileData, nBytesPerChar, dwLen, lpcstrLarge, hgLargeIcon );
if (FAILED(hr))
return hr;
// try to read small icon ( look behind the large one - it should be there!)
HGLOBAL hgSmallIcon = NULL;
hr = FindAndReadIconData( pFileData, nBytesPerChar, dwLen, lpcstrSmall, hgSmallIcon );
if (FAILED(hr))
goto ON_ERROR;
// do get the handles of the icons!
hr = LoadIconFromHGlobal(hgLargeIcon, hLargeIcon);
if (FAILED(hr))
goto ON_ERROR;
hr = LoadIconFromHGlobal(hgSmallIcon, hSmallIcon);
if (FAILED(hr))
goto ON_ERROR;
persistableIcon.m_icon32.Attach (hLargeIcon);
persistableIcon.m_icon16.Attach (hSmallIcon);
// done!
hr = S_OK;
ON_ERROR:
if (hLargeIcon && FAILED(hr))
DestroyIcon(hLargeIcon);
if (hSmallIcon && FAILED(hr))
DestroyIcon(hSmallIcon);
if (hgLargeIcon)
GlobalFree(hgLargeIcon);
return hr;
}
/***************************************************************************\
*
* METHOD: ExtractIconFromXMLFile
*
* PURPOSE: Loads icon from file containing XML document
*
* PARAMETERS:
* LPCTSTR lpstrFileName - name of file to inspect
* CPersistableIcon &persistableIcon - Icon to initialize upon successful loading
*
* RETURNS:
* HRESULT - result code
*
\***************************************************************************/
HRESULT ExtractIconFromXMLFile(LPCTSTR lpstrFileName, CPersistableIcon &persistableIcon)
{
HRESULT hrResult = S_OK;
// open the file
HANDLE hFile = CreateFile(lpstrFileName, GENERIC_READ, FILE_SHARE_READ,
NULL, OPEN_EXISTING, 0, NULL);
if (hFile == INVALID_HANDLE_VALUE)
return hrResult = HRESULT_FROM_WIN32(GetLastError());
// map data into virtual memory
HANDLE hMapping = CreateFileMapping(hFile, NULL/*sec*/, PAGE_READONLY,
0/*sizeHi*/, 0/*sizeLo*/, NULL/*szname*/);
if (hMapping == NULL)
{
hrResult = HRESULT_FROM_WIN32(GetLastError());
CloseHandle(hFile);
return hrResult;
}
// get pointer to physical memory
LPVOID pData = MapViewOfFile(hMapping, FILE_MAP_READ, 0/*offHi*/, 0/*offLo*/, 0/*len*/);
if (pData)
{
// we are sure here the sizeHi is zero. mapping should fail else
DWORD dwLen = GetFileSize(hFile, NULL/*pSizeHi*/);
// try to load icon from mapped data
hrResult = LoadIconFromXMLData((LPCSTR)pData, dwLen, persistableIcon);
// we do not need a view any more
UnmapViewOfFile(pData);
pData = NULL;
// fall thru to release handles before return
}
else // getting the view failed
{
hrResult = HRESULT_FROM_WIN32(GetLastError());
// fall thru to release handles before return
}
CloseHandle(hMapping);
CloseHandle(hFile);
return hrResult;
}
/***************************************************************************\
*
* METHOD: ValidateXMLDocument
*
* PURPOSE: Validates XML document loaded into memory
* NOTE: it's rather __VERY__ weak inspection. it only checks if doc starts with '<'
*
* PARAMETERS:
* LPCSTR &pFileData - [in/out] - data to look thru / start of xml documet contents
* DWORD &dwLen - [in/out] - init. data len / data left after skipping header
* int *piBytesPerEnglishChar - [out, optional] - bytes occupied by english character
*
* RETURNS:
* HRESULT - (S_FALSE - data does not qualify for XML document)
*
\***************************************************************************/
static HRESULT
ValidateXMLDocument(LPCSTR &pFileData, DWORD &dwLen, int *piBytesPerEnglishChar /*= NULL*/)
{
// default to ansi when not sure
int nBytesPerChar = 1;
if (dwLen >= 2)
{
// raw UNICODE big endian ?
if ((unsigned char)pFileData[1] == 0xff && (unsigned char)pFileData[0] == 0xfe)
{
// to maintain simplicity of the code, we will treat this like little endian.
// we just position file pointer incorrectly.
// since everything we are intersted:
// - is in page 0 (xml tags and base 64)
// - never is at the end of file ( closing tags expected )
// - we do not care about the page of any data
// :we can mix the page codes of the elements and pretend dealing w/ little endian
pFileData += 3; // skip UNICODE signature and first page number
dwLen -= 3;
dwLen /= 2; // we count characters - seems like we have less of them
nBytesPerChar = 2;
}
// raw UNICODE little endian ?
else if ((unsigned char)pFileData[0] == 0xff && (unsigned char)pFileData[1] == 0xfe)
{
pFileData += 2; // skip UNICODE signature
dwLen -= 2;
dwLen /= 2; // we count characters - seems like we have less of them
nBytesPerChar = 2;
}
// compressed UNICODE (UTF 8) ?
else if (dwLen >= 2 && (unsigned char)pFileData[0] == 0xef
&& (unsigned char)pFileData[1] == 0xbb && (unsigned char)pFileData[2] == 0xbf)
{
//just skip signature and treat it as ANSI
pFileData += 3; // skip UNICODE signature
dwLen -= 3;
nBytesPerChar = 1;
}
}
// skip whitespaces
char ch;
while (dwLen && (((ch = *pFileData)==' ') || (ch=='\t') || (ch=='\n') || (ch=='\r')))
{
pFileData += nBytesPerChar;
--dwLen;
}
// check if we have a valid xml file (it should open with '<')
if (!dwLen || *pFileData != '<')
return S_FALSE;
if (piBytesPerEnglishChar)
*piBytesPerEnglishChar = nBytesPerChar;
return S_OK;
}