344 lines
7.1 KiB
C
344 lines
7.1 KiB
C
/*++
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Copyright (c) 1994-1997 Microsoft Corporation
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Module Name:
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fwrite.c
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Abstract:
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This module demonstrates a simple file transfer using ISAPI application
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using the WriteClient() callback.
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Author:
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Murali R. Krishnan ( MuraliK ) 25-Apr-1996
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Revision History:
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--*/
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#include <windows.h>
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#include <iisext.h>
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#include <dbgutil.h>
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# include "openf.h"
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DWORD
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SendHeaderToClient( IN EXTENSION_CONTROL_BLOCK * pecb, IN LPCSTR pszErrorMsg);
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DWORD
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SendFileToClient( IN EXTENSION_CONTROL_BLOCK * pecb, IN LPCSTR pszFile);
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DWORD
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SendFileOver( IN EXTENSION_CONTROL_BLOCK * pecb, IN HANDLE hFile);
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BOOL WINAPI
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DllLibMain(
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IN HINSTANCE hinstDll,
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IN DWORD fdwReason,
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IN LPVOID lpvContext OPTIONAL)
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/*++
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Routine Description:
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This function DllLibMain() is the main initialization function for
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this DLL. It initializes local variables and prepares it to be invoked
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subsequently.
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Arguments:
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hinstDll Instance Handle of the DLL
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fdwReason Reason why NT called this DLL
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lpvReserved Reserved parameter for future use.
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Return Value:
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Returns TRUE is successful; otherwise FALSE is returned.
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--*/
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{
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BOOL fReturn = TRUE;
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switch (fdwReason ) {
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case DLL_PROCESS_ATTACH:
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{
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OutputDebugString( " Initializing the global data for fwrite.dll\n");
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//
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// Initialize various data and modules.
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//
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fReturn = (InitFileHandleCache() == NO_ERROR);
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break;
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} /* case DLL_PROCESS_ATTACH */
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case DLL_PROCESS_DETACH:
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{
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//
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// Only cleanup when we are called because of a FreeLibrary().
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// i.e., when lpvContext == NULL
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// If we are called because of a process termination,
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// dont free anything. System will free resources and memory for us.
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//
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CleanupFileHandleCache();
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break;
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} /* case DLL_PROCESS_DETACH */
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default:
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break;
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} /* switch */
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return ( fReturn);
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} /* DllLibMain() */
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DWORD
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HttpExtensionProc(
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EXTENSION_CONTROL_BLOCK * pecb
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)
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{
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DWORD hseStatus;
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if ( pecb->lpszQueryString == NULL) {
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hseStatus = SendHeaderToClient( pecb, "File Not Found");
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} else {
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hseStatus = SendFileToClient( pecb, pecb->lpszQueryString);
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}
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return ( hseStatus);
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} // HttpExtensionProc()
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BOOL
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GetExtensionVersion(
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HSE_VERSION_INFO * pver
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)
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{
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pver->dwExtensionVersion = MAKELONG( 1, 0 );
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strcpy( pver->lpszExtensionDesc,
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"File Transfer using WriteClient" );
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return TRUE;
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}
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BOOL
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TerminateExtension(
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DWORD dwFlags
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)
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/*++
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Purpose:
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This is optional ISAPI extension DLL entry point.
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If present, it will be called before unloading the DLL,
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giving it a chance to perform any shutdown procedures.
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Arguments:
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dwFlags - specifies whether the DLL can refuse to unload or not
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Returns:
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TRUE, if the DLL can be unloaded
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--*/
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{
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return TRUE;
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}
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DWORD
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SendHeaderToClient( IN EXTENSION_CONTROL_BLOCK * pecb, IN LPCSTR pszErrorMsg)
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{
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CHAR buff[600];
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//
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// Note the HTTP header block is terminated by a blank '\r\n' pair,
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// followed by the document body
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//
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wsprintf( buff,
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"Content-Type: text/html\r\n"
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"\r\n"
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"<head><title>Simple File Transfer (Write) </title></head>\n"
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"<body><h1>%s</h1>\n"
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,
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pszErrorMsg );
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if ( !pecb->ServerSupportFunction( pecb->ConnID,
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HSE_REQ_SEND_RESPONSE_HEADER,
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"200 OK",
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NULL,
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(LPDWORD) buff )
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) {
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return HSE_STATUS_ERROR;
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}
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return ( HSE_STATUS_SUCCESS);
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} // SendHeaderToClient()
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DWORD
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SendFileToClient( IN EXTENSION_CONTROL_BLOCK * pecb, IN LPCSTR pszFile)
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{
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CHAR pchBuffer[1024];
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HANDLE hFile;
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DWORD hseStatus = HSE_STATUS_SUCCESS;
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hFile = FcOpenFile( pecb, pszFile);
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if ( hFile == INVALID_HANDLE_VALUE) {
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wsprintfA( pchBuffer,
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"OpenFailed: Error (%d) while opening the file %s.\n",
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GetLastError(), pszFile);
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hseStatus = SendHeaderToClient( pecb, pchBuffer);
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} else {
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wsprintfA( pchBuffer, " Transferred file contains...");
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hseStatus = SendHeaderToClient( pecb, pchBuffer);
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if ( hseStatus == HSE_STATUS_SUCCESS) {
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hseStatus = SendFileOver( pecb, hFile);
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if ( hseStatus != HSE_STATUS_PENDING) {
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if ( hseStatus != HSE_STATUS_SUCCESS) {
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//
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// Error in transmitting the file. Send error message.
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//
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wsprintfA( pchBuffer,
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"Send Failed: Error (%d) for file %s.\n",
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GetLastError(), pszFile);
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SendHeaderToClient( pecb, pchBuffer);
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}
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}
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if ( hseStatus != HSE_STATUS_PENDING) {
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//
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// assume that the data is transmitted.
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//
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// close file handle
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FcCloseFile( hFile);
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}
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}
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}
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return (hseStatus);
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} // SendFileToClient()
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# define MAX_BUFFER_SIZE (4096)
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DWORD
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SendFileOver( IN EXTENSION_CONTROL_BLOCK * pecb, IN HANDLE hFile)
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{
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CHAR pchBuffer[MAX_BUFFER_SIZE];
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DWORD dwBytesInFile = GetFileSize(hFile, NULL);
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DWORD nRead = 0;
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DWORD hseStatus = HSE_STATUS_SUCCESS;
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OVERLAPPED ov;
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//
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// Send the whole file.
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//
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//
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// Loop thru reading the file and transmitting it to client
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//
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memset(&ov, 0, sizeof(OVERLAPPED));
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ov.OffsetHigh = 0;
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ov.Offset = 0;
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ov.hEvent = IIS_CREATE_EVENT(
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"OVERLAPPED::hEvent",
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&ov,
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TRUE,
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FALSE
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);
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if ( ov.hEvent == NULL) {
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return (HSE_STATUS_ERROR);
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}
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do {
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nRead = 0;
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// read data from the file
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if (!FcReadFromFile( hFile, pchBuffer, MAX_BUFFER_SIZE, &nRead,
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&ov)
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) {
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hseStatus = ((GetLastError() == ERROR_HANDLE_EOF) ? HSE_STATUS_SUCCESS : HSE_STATUS_ERROR);
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break;
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}
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// write data to client
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if ( !pecb->WriteClient( pecb->ConnID,
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pchBuffer, &nRead,
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0)
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) {
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hseStatus = HSE_STATUS_ERROR;
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break;
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}
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} while (TRUE);
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if ( ov.hEvent != NULL) {
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DWORD err;
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err = GetLastError();
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CloseHandle( ov.hEvent);
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ov.hEvent = NULL;
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SetLastError( err);
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}
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return (hseStatus);
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} // SendFileOver()
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