269 lines
6.6 KiB
C++
269 lines
6.6 KiB
C++
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//////////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2000 Microsoft Corporation. All Rights Reserved.
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//
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// File: DplayBufHelp.cpp
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// Content: Helper functions for DPlay Buffers (Byte arrays)
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//
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//////////////////////////////////////////////////////////////////////////////
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#include "stdafx.h"
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#include "Direct.h"
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#define SAFE_FREE(p) { if(p) { free (p); p=NULL; } }
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#define SAFE_DELETE(p) { if(p) { delete (p); p=NULL; } }
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#define INITIAL_BUFFER_SIZE 20
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HRESULT WINAPI VB_GrowBuffer(SAFEARRAY **Buffer, DWORD dwGrowSize);
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HRESULT WINAPI VB_NewBuffer(SAFEARRAY **Buffer, long *lOffSet);
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HRESULT WINAPI VB_AddDataToBuffer(SAFEARRAY **Buffer, void *lData, DWORD lSize, long *lOffSet);
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HRESULT WINAPI VB_AddStringToBuffer(SAFEARRAY **Buffer, BSTR StringData, long *lOffSet);
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HRESULT WINAPI VB_GetDataFromBuffer(SAFEARRAY **Buffer, void *lData, DWORD lSize, long *lOffSet);
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HRESULT WINAPI VB_GetStringFromBuffer(SAFEARRAY **Buffer, long *lOffSet, BSTR *sData);
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// Functions for writing a buffer
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HRESULT WINAPI VB_AddStringToBuffer(SAFEARRAY **Buffer, BSTR StringData, long *lOffSet)
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{
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HRESULT hr;
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// For strings we will first write out a DWORD
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// containging the length of the string. Then we
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// will write the actual data to the string.
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DWORD dwStrLen= (((DWORD*)StringData)[-1]);
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DWORD dwDataSize = sizeof(DWORD) + dwStrLen;
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if (!StringData)
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return E_INVALIDARG;
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if (!((SAFEARRAY*)*Buffer))
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{
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// We need to create this buffer, it doesn't exist
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SAFEARRAY *lpData = NULL;
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SAFEARRAYBOUND rgsabound[1];
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// Let's create our SafeArray
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rgsabound[0].lLbound = 0; // A single dimension array that is zero based
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rgsabound[0].cElements = dwDataSize; //Set the initial size
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// Create this data
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lpData = SafeArrayCreate(VT_UI1, 1, rgsabound);
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if (!lpData)
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return E_OUTOFMEMORY;
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(SAFEARRAY*)*Buffer = lpData;
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}
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if (!((SAFEARRAY*)*Buffer)->pvData)
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return E_INVALIDARG;
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// Do we have enough memory for this string right now?
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if (*lOffSet + dwDataSize > ((SAFEARRAY*)*Buffer)->rgsabound[0].cElements)
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if (FAILED( hr = VB_GrowBuffer(Buffer, dwDataSize) ) )
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return hr;
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// Ok, now we' ve got our memory, copy it over
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// First the length
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BYTE *lPtr = (BYTE*)((SAFEARRAY*)*Buffer)->pvData;
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__try {
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memcpy(lPtr + *lOffSet, &dwStrLen, sizeof(DWORD));
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*lOffSet += sizeof(DWORD);
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// Now the actual string
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memcpy(lPtr + *lOffSet, StringData, dwStrLen);
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*lOffSet += dwStrLen;
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}
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__except(EXCEPTION_EXECUTE_HANDLER)
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{
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return E_INVALIDARG;
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}
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return S_OK;
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}
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HRESULT WINAPI VB_AddDataToBuffer(SAFEARRAY **Buffer, void *lData, DWORD lSize, long *lOffSet)
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{
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HRESULT hr;
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if (!lData)
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return E_INVALIDARG;
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if (!lSize)
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return E_INVALIDARG;
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if (!((SAFEARRAY*)*Buffer))
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{
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// We need to create this buffer, it doesn't exist
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SAFEARRAY *lpData = NULL;
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SAFEARRAYBOUND rgsabound[1];
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// Let's create our SafeArray
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rgsabound[0].lLbound = 0; // A single dimension array that is zero based
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rgsabound[0].cElements = lSize; //Set the initial size
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// Create this data
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lpData = SafeArrayCreate(VT_UI1, 1, rgsabound);
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if (!lpData)
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return E_OUTOFMEMORY;
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(SAFEARRAY*)*Buffer = lpData;
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}
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if (!((SAFEARRAY*)*Buffer)->pvData)
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return E_INVALIDARG;
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// Do we have enough memory for this string right now?
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if (*lOffSet + lSize > ((SAFEARRAY*)*Buffer)->rgsabound[0].cElements)
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if (FAILED( hr = VB_GrowBuffer(Buffer, lSize) ) )
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return hr;
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BYTE *lPtr = (BYTE*)((SAFEARRAY*)*Buffer)->pvData;
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__try {
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memcpy(lPtr + *lOffSet, lData, lSize);
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*lOffSet += lSize;
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}
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__except(EXCEPTION_EXECUTE_HANDLER)
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{
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return E_INVALIDARG;
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}
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return S_OK;
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}
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HRESULT WINAPI VB_NewBuffer(SAFEARRAY **Buffer, long *lOffSet)
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{
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// Set up with a 20 byte msg at first
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SAFEARRAY *lpData = NULL;
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SAFEARRAYBOUND rgsabound[1];
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// Let's create our SafeArray
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rgsabound[0].lLbound = 0; // A single dimension array that is zero based
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rgsabound[0].cElements = INITIAL_BUFFER_SIZE; //Set the initial size
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// Create this data
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lpData = SafeArrayCreate(VT_UI1, 1, rgsabound);
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if (!lpData)
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return E_OUTOFMEMORY;
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(SAFEARRAY*)*Buffer = lpData;
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*lOffSet = 0;
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return S_OK;
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}
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HRESULT WINAPI VB_GrowBuffer(SAFEARRAY **Buffer, DWORD dwGrowSize)
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{
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SAFEARRAY *lpData = NULL;
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SAFEARRAYBOUND rgsabound[1];
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DWORD dwCurSize = 0;
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if (!dwGrowSize)
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return E_INVALIDARG;
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if (!((SAFEARRAY*)*Buffer))
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return E_INVALIDARG;
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if (!((SAFEARRAY*)*Buffer)->pvData)
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return E_INVALIDARG;
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dwCurSize = ((SAFEARRAY*)*Buffer)->rgsabound[0].cElements;
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// Let's create a new SafeArray
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rgsabound[0].lLbound = 0; // A single dimension array that is zero based
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rgsabound[0].cElements = dwCurSize + dwGrowSize; //Set the size
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// Create this data
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lpData = SafeArrayCreate(VT_UI1, 1, rgsabound);
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if (!lpData)
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return E_OUTOFMEMORY;
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__try {
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memcpy(lpData->pvData, ((SAFEARRAY*)*Buffer)->pvData, dwCurSize);
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SafeArrayDestroy((SAFEARRAY*)*Buffer);
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(SAFEARRAY*)*Buffer = lpData;
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}
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__except(EXCEPTION_EXECUTE_HANDLER)
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{
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return E_FAIL;
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}
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return S_OK;
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}
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HRESULT WINAPI VB_GetDataFromBuffer(SAFEARRAY **Buffer, void *lData, DWORD lSize, long *lOffSet)
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{
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// Simply copy the memory from the offset to the new data
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if (!lData)
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return E_INVALIDARG;
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if (!lSize)
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return E_INVALIDARG;
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if (!(SAFEARRAY*)*Buffer)
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return E_INVALIDARG;
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if (!((SAFEARRAY*)*Buffer)->pvData)
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return E_INVALIDARG;
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if (*lOffSet + lSize > ((SAFEARRAY*)*Buffer)->rgsabound[0].cElements)
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return E_INVALIDARG;
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BYTE *lPtr = (BYTE*)((SAFEARRAY*)*Buffer)->pvData;
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__try {
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memcpy(lData, lPtr + *lOffSet, lSize);
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*lOffSet += lSize;
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}
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__except(EXCEPTION_EXECUTE_HANDLER)
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{
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return E_INVALIDARG;
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}
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return S_OK;
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}
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HRESULT WINAPI VB_GetStringFromBuffer(SAFEARRAY **Buffer, long *lOffSet, BSTR *sData)
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{
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DWORD dwStrLen = 0;
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WCHAR *sNewString = NULL;
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// Simply copy the memory from the offset to the new data
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if (!(SAFEARRAY*)*Buffer)
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return E_INVALIDARG;
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if (!((SAFEARRAY*)*Buffer)->pvData)
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return E_INVALIDARG;
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if (*lOffSet + sizeof(DWORD) > ((SAFEARRAY*)*Buffer)->rgsabound[0].cElements)
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return E_INVALIDARG;
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BYTE *lPtr = (BYTE*)((SAFEARRAY*)*Buffer)->pvData;
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__try {
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// First read the size of the string
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dwStrLen = *(DWORD*)(lPtr + *lOffSet);
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*lOffSet += sizeof(DWORD);
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if (*lOffSet + dwStrLen > ((SAFEARRAY*)*Buffer)->rgsabound[0].cElements)
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return E_INVALIDARG;
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sNewString = (WCHAR*)new BYTE[dwStrLen+2];
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if (!sNewString)
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return E_OUTOFMEMORY;
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ZeroMemory(sNewString, dwStrLen+2);
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memcpy(sNewString, lPtr + *lOffSet, dwStrLen);
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*sData = SysAllocString(sNewString);
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*lOffSet += (dwStrLen);
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}
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__except(EXCEPTION_EXECUTE_HANDLER)
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{
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return E_INVALIDARG;
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}
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return S_OK;
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}
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