141 lines
3 KiB
C++
141 lines
3 KiB
C++
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/************************************************************************
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Copyright (c) 2000 - 2000 Microsoft Corporation
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Module Name :
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bitisapi.cpp
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Abstract :
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ISAPI to get HTTP/1.1 byte range to work through HTTP/1.0 proxies.
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Author :
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Revision History :
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***********************************************************************/
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#include <windows.h>
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#include <wininet.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <httpfilt.h>
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#include <strsafe.h>
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// From ntrtl.h:
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//
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extern "C"
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{
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ULONG
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__cdecl
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DbgPrint(
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PCH Format,
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...
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);
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}
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const size_t INT_DIGITS = 10;
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const size_t INT64_DIGITS = 20;
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BOOL
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DecodeURL(LPSTR pszUrl, LPCSTR * ppRange);
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BOOL WINAPI
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GetFilterVersion(HTTP_FILTER_VERSION * pVer)
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{
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//
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// Specify the types and order of notification
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//
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pVer->dwFlags = (SF_NOTIFY_PREPROC_HEADERS | SF_NOTIFY_ORDER_HIGH);
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pVer->dwFilterVersion = HTTP_FILTER_REVISION;
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StringCchCopyA( pVer->lpszFilterDesc, SF_MAX_FILTER_DESC_LEN, "ISAPI filter for BITS download");
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return TRUE;
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}
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DWORD WINAPI
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HttpFilterProc( HTTP_FILTER_CONTEXT * pfc,
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DWORD NotificationType,
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VOID * pvData )
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{
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char Template[] = " bytes=%s\r\n";
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HTTP_FILTER_PREPROC_HEADERS *pHeaders;
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char szUrl[INTERNET_MAX_URL_LENGTH];
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DWORD cbUrl = sizeof(szUrl);
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// The value of the range header. Looks like "bytes=<start>-<end>".
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//
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char szValue[ RTL_NUMBER_OF(Template) + INT64_DIGITS + 1 + INT64_DIGITS ];
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LPCSTR szRange = 0;
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if (NotificationType == SF_NOTIFY_PREPROC_HEADERS)
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{
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pHeaders = (PHTTP_FILTER_PREPROC_HEADERS) pvData;
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if (! pHeaders->GetHeader(pfc, "url", szUrl, &cbUrl))
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{
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return SF_STATUS_REQ_NEXT_NOTIFICATION;
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}
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if (! DecodeURL(szUrl, &szRange))
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{
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return SF_STATUS_REQ_NEXT_NOTIFICATION;
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}
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if (! pHeaders->SetHeader(pfc, "url", szUrl))
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{
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#if DBG
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DbgPrint("unable to set URL='%s'", szUrl);
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#endif
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return SF_STATUS_REQ_ERROR;
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}
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if (S_OK != StringCbPrintfA(szValue, sizeof(szValue), Template, szRange))
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{
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#if DBG
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DbgPrint("byte range is too long: '%s'", szRange );
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#endif
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return SF_STATUS_REQ_ERROR;
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}
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if (! pHeaders->AddHeader(pfc, "Range:", szValue))
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{
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return SF_STATUS_REQ_ERROR;
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}
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}
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return SF_STATUS_REQ_NEXT_NOTIFICATION;
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}
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BOOL
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DecodeURL(LPSTR pszUrl, LPCSTR * ppRange)
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{
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LPSTR pszStart = strchr(pszUrl, '@');
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if (!pszStart)
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{
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return FALSE;
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}
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++pszStart;
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LPSTR pszEnd = strchr(pszStart, '@');
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if (!pszEnd)
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{
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return FALSE;
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}
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//
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// Plant '\0' over the leading and trailing '@'.
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//
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*(pszStart-1) = '\0';
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*pszEnd = '\0';
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*ppRange = pszStart;
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return TRUE;
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}
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