isapimagick.c

下载来的一个看图软件的源代码

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                         I S A P I M A G I C K                               %
%                                                                             %
%                                                                             %
%      A shim layer to give command line utilities an ISAPI interface.        %
%                                                                             %
%                                                                             %
%                                                                             %
%                              Software Design                                %
%                           William T. Radcliffe                              %
%                                June 2000                                    %
%                                                                             %
%                                                                             %
%  Copyright (C) 2000 ImageMagick Studio, a non-profit organization dedicated %
%  to making software imaging solutions freely available.                     %
%                                                                             %
%  Permission is hereby granted, free of charge, to any person obtaining a    %
%  copy of this software and associated documentation files ("ImageMagick"),  %
%  to deal in ImageMagick without restriction, including without limitation   %
%  the rights to use, copy, modify, merge, publish, distribute, sublicense,   %
%  and/or sell copies of ImageMagick, and to permit persons to whom the       %
%  ImageMagick is furnished to do so, subject to the following conditions:    %
%                                                                             %
%  The above copyright notice and this permission notice shall be included in %
%  all copies or substantial portions of ImageMagick.                         %
%                                                                             %
%  The software is provided "as is", without warranty of any kind, express or %
%  implied, including but not limited to the warranties of merchantability,   %
%  fitness for a particular purpose and noninfringement.  In no event shall   %
%  ImageMagick Studio be liable for any claim, damages or other liability,    %
%  whether in an action of contract, tort or otherwise, arising from, out of  %
%  or in connection with ImageMagick or the use or other dealings in          %
%  ImageMagick.                                                               %
%                                                                             %
%  Except as contained in this notice, the name of the ImageMagick Studio     %
%  shall not be used in advertising or otherwise to promote the sale, use or  %
%  other dealings in ImageMagick without prior written authorization from the %
%  ImageMagick Studio.                                                        %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  This is a simple shim that provides an ISAPI layer for calling into any of
%  the normal command line utilities.
*/

#include "magick.h"
#include "define.h"

#include <httpext.h>

#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <time.h>

// A critical section handle is used to protect global
// state properties
CRITICAL_SECTION gCS;
// Global path to this DLL
TCHAR gszAppPath[MAX_PATH];

/*
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%                                                                             %
%                                                                             %
%                                                                             %
%  D l l M a i n                                                              %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  DllMain - ISAPI / Win32 API method. This the the entry and exit
%  point for the extension. It is called when the extension is loaded
%  and unloaded by IIS. This is where state properties need to be 
%  retrieved from and store on persistant storage.
%
%
*/
BOOL APIENTRY DllMain( HANDLE hModule,
      DWORD ul_reason_for_call, LPVOID lpReserved )
{
  switch( ul_reason_for_call ) {
  case DLL_PROCESS_ATTACH: 
    {
      InitializeCriticalSection(&gCS);
      gszAppPath[0]='\0';
      if (!GetModuleFileName (hModule, gszAppPath, MAX_PATH))
        return FALSE;
      InitializeMagick(gszAppPath);
      break;
    }
  case DLL_PROCESS_DETACH:
		{
		  DeleteCriticalSection(&gCS);
		  break;
		}
  case DLL_THREAD_ATTACH:
  case DLL_THREAD_DETACH:
  default:
    break;
  }
  return TRUE;
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%  G e t E x t e n s i o n V e r s i o n                                      %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  GetExtensionVersion - ISAPI / Win32 API method. This method
%  is required by IIS. It is called following the process load
%  to ensure that the  extension is compatable with the server.
%
*/
BOOL WINAPI GetExtensionVersion( HSE_VERSION_INFO *pVer )
{
  pVer->dwExtensionVersion = MAKELONG(	HSE_VERSION_MINOR,
										HSE_VERSION_MAJOR );
  lstrcpyn( pVer->lpszExtensionDesc,
            "ISAPIMagick for IIS", HSE_MAX_EXT_DLL_NAME_LEN );
  return TRUE;
} 

/*
  Include the convert mainline as a subroutine
*/
#define Usage convert_Usage
#define main convert_main
#include "utilities\convert.c"
#undef Usage
#undef main
/*
  Include the combine mainline as a subroutine
*/
#define Usage combine_Usage
#define main combine_main
#include "utilities\composite.c"
#undef Usage
#undef main

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%  C G I F i f o                                                              %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  Method CGIFifo is the default output stream handler for CGI usage. It is
%  called by the stream subsystem whenever a buffer of data needs to be sent
%  to the output.It receives a pointer to the image as well as the buffer
%  of data and its length.
%
%  The format of the HttpUnescape method is:
%
%      int CGIFifo(const Image *image,const void *data,const size_t length)
%
%  A description of each parameter follows:
%
%    o image:  A pointer to the image being sent to the output stream.
%
%    o data: A pointer to the buffer of data to be sent.
%
%    o length: The length of the buffer of data to be sent.
%
*/
int CGIFifo(const Image *image,const void *data,const size_t length)
{
  EXTENSION_CONTROL_BLOCK *pECB;
  size_t tlen=length;
  pECB = (EXTENSION_CONTROL_BLOCK *)image->client_data;
  pECB->WriteClient( pECB->ConnID, (char *)data, &tlen, 0);
  return(tlen);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%  D e c o d e H e x                                                          %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  Method DecodeHex decodes a hexadecimal string. It stops after outmax
%  characters or when an invalid hex character is reached. It also sets
%  the input pointer to the first unprocessed character.  Returns the
%  the result as a binary number.
%
%  The format of the HttpUnescape method is:
%
%      int DecodeHex(const char **input,size_t outmax)
%
%  A description of each parameter follows:
%
%    o input:  Specifies the string to be converted.
%
%    o outmax: Specifies the maximum number of characters to process.
%
*/
int DecodeHex(const char **input,size_t outmax)
{
  static char
    hex_to_bin [128] = {
      -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,    /*            */
      -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,    /*            */
      -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,    /*            */
       0, 1, 2, 3, 4, 5, 6, 7, 8, 9,-1,-1,-1,-1,-1,-1,    /*   0..9     */
      -1,10,11,12,13,14,15,-1,-1,-1,-1,-1,-1,-1,-1,-1,    /*   A..F     */
      -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,    /*            */
      -1,10,11,12,13,14,15,-1,-1,-1,-1,-1,-1,-1,-1,-1,    /*   a..f     */
      -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1 };  /*            */

  int
    nextch;

  size_t
    index,
    result;

  assert(input != (const char **) NULL);
  assert((*input) != (const char *) NULL);

  index  = 0;
  result = 0;
  while (outmax == 0 || index < outmax)
  {
    nextch = (*input) [index] & 127;
    if (nextch && hex_to_bin [nextch] != -1)
    {
      result = result * 16 + hex_to_bin [nextch];
      index++;
    }
    else
      break;
  }
  (*input) += index;
  return (result);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%  H t t p U n e s c a p e                                                    %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  Method HttpUnescape removes HTTP escaping from a string. If the result
%  string is NULL, it modifies the source string in place, else fills-in
%  the result string. This method returns the resulting string. End-of-line
%  sequences (%0A%0D) are stored as a single new-line character, i.e.
%  carriage-returns (%0D) are not stored.
%
%  The format of the HttpUnescape method is:
%
%      char *HttpUnescape(char *string,char *result)
%
%  A description of each parameter follows:
%
%    o string:  Specifies the string to be converted.
%
%    o result:  Specifies the destination for the converted result. A NULL
%               indicates that the conversion happens "in-place".
%
*/
char *HttpUnescape(char *string,char *result)
{
  char
    *target; /* Where we store the result */

  assert(string != (char *) NULL);
  if (!result) /* If result string is null, */
    result = string; /* modify in place */
  target = result;

  while (*string)
  {
    if (*string == '%'  /* Unescape %xx sequence */
          && isxdigit(string [1]) && isxdigit(string [2]))
      {
        string++;
        *target = DecodeHex ((const char **) &string, 2);
        if (*target != '\r')
          target++; /* We do not store CR's */
      }
    else
      {
        if (*string == '+') /* Spaces are escaped as '+' */
          *target++ = ' ';
        else
          *target++ = *string; /* Otherwise just copy */