ReactOS 0.4.15-dev-7089-gea8a49d
memory.c
Go to the documentation of this file.
1/*
2 * PROJECT: ReactOS Spooler Router
3 * LICENSE: GPL-2.0+ (https://spdx.org/licenses/GPL-2.0+)
4 * PURPOSE: Functions for allocating and freeing memory
5 * COPYRIGHT: Copyright 2015-2017 Colin Finck (colin@reactos.org)
6 */
7
8#include "precomp.h"
9
10
30{
31 ASSERT(pcbBuffer);
32
33 // Align down the buffer size in pcbBuffer to a 4-byte boundary.
34 *pcbBuffer -= *pcbBuffer % sizeof(DWORD);
35
36 // Check if pBuffer is 4-byte aligned. If not, allocate a 4-byte aligned buffer.
37 if ((ULONG_PTR)pBuffer % sizeof(DWORD))
38 pBuffer = DllAllocSplMem(*pcbBuffer);
39
40 return pBuffer;
41}
42
57{
58 DWORD cbInput;
59 PWSTR pwszOutput;
60
61 // Sanity check
62 if (!pwszInput)
63 return NULL;
64
65 // Get the length of the input string.
66 cbInput = (wcslen(pwszInput) + 1) * sizeof(WCHAR);
67
68 // Allocate it. We don't use DllAllocSplMem here, because it unnecessarily zeroes the memory.
69 pwszOutput = HeapAlloc(hProcessHeap, 0, cbInput);
70 if (!pwszOutput)
71 {
72 ERR("HeapAlloc failed!\n");
73 return NULL;
74 }
75
76 // Copy the string and return it.
77 CopyMemory(pwszOutput, pwszInput, cbInput);
78 return pwszOutput;
79}
80
96{
97 return HeapAlloc(hProcessHeap, HEAP_ZERO_MEMORY, dwBytes);
98}
99
113{
114 if ( !pMem ) return TRUE;
115 return HeapFree(hProcessHeap, 0, pMem);
116}
117
131{
132 if ( pwszString )
133 return HeapFree(hProcessHeap, 0, pwszString);
134 return FALSE;
135}
136
157ReallocSplMem(PVOID pOldMem, DWORD cbOld, DWORD cbNew)
158{
159 PVOID pNewMem;
160
161 // Always allocate the new block of memory.
162 pNewMem = DllAllocSplMem(cbNew);
163 if (!pNewMem)
164 {
165 ERR("DllAllocSplMem failed!\n");
166 return NULL;
167 }
168
169 // Copy the old memory into the new block and free it.
170 if (pOldMem)
171 {
172 CopyMemory(pNewMem, pOldMem, min(cbOld, cbNew));
173 DllFreeSplMem(pOldMem);
174 }
175
176 return pNewMem;
177}
178
195ReallocSplStr(PWSTR* ppwszString, PCWSTR pwszInput)
196{
197 if (*ppwszString)
198 DllFreeSplStr(*ppwszString);
199
200 *ppwszString = AllocSplStr(pwszInput);
201
202 return TRUE;
203}
204
239UndoAlignRpcPtr(PVOID pDestinationBuffer, PVOID pSourceBuffer, DWORD cbBuffer, PDWORD pcbNeeded)
240{
241 // pDestinationBuffer is accessed unless pSourceBuffer equals pDestinationBuffer or cbBuffer is 0.
242 ASSERT(pDestinationBuffer || pSourceBuffer == pDestinationBuffer || cbBuffer == 0);
243
244 // If pSourceBuffer is given, and source and destination pointers don't match,
245 // we assume that pSourceBuffer is the buffer allocated by AlignRpcPtr.
246 if (pSourceBuffer && pSourceBuffer != pDestinationBuffer)
247 {
248 // Copy back the buffer data to the (usually unaligned) destination buffer
249 // and free the buffer allocated by AlignRpcPtr.
250 CopyMemory(pDestinationBuffer, pSourceBuffer, cbBuffer);
251 DllFreeSplMem(pSourceBuffer);
252 }
253
254 // If pcbNeeded is given, align it up to a 4-byte boundary.
255 if (pcbNeeded && *pcbNeeded % sizeof(DWORD))
256 *pcbNeeded += sizeof(DWORD) - *pcbNeeded % sizeof(DWORD);
257
258 return pcbNeeded;
259}
#define ERR(fmt,...)
Definition: debug.h:110
#define NULL
Definition: types.h:112
#define TRUE
Definition: types.h:120
#define FALSE
Definition: types.h:117
#define HeapAlloc
Definition: compat.h:733
#define HeapFree(x, y, z)
Definition: compat.h:735
#define HEAP_ZERO_MEMORY
Definition: compat.h:134
unsigned int BOOL
Definition: ntddk_ex.h:94
unsigned long DWORD
Definition: ntddk_ex.h:95
_CRTIMP size_t __cdecl wcslen(_In_z_ const wchar_t *_Str)
HANDLE hProcessHeap
Definition: kbswitch.c:43
#define ASSERT(a)
Definition: mode.c:44
#define min(a, b)
Definition: monoChain.cc:55
#define DWORD
Definition: nt_native.h:44
DWORD * PDWORD
Definition: pedump.c:68
PVOID pBuffer
uint16_t * PWSTR
Definition: typedefs.h:56
const uint16_t * PCWSTR
Definition: typedefs.h:57
uint32_t ULONG_PTR
Definition: typedefs.h:65
BOOL WINAPI DllFreeSplMem(PVOID pMem)
Definition: memory.c:112
PVOID WINAPI ReallocSplMem(PVOID pOldMem, DWORD cbOld, DWORD cbNew)
Definition: memory.c:157
PVOID WINAPI AlignRpcPtr(PVOID pBuffer, PDWORD pcbBuffer)
Definition: memory.c:29
PVOID WINAPI DllAllocSplMem(DWORD dwBytes)
Definition: memory.c:95
BOOL WINAPI DllFreeSplStr(PWSTR pwszString)
Definition: memory.c:130
PWSTR WINAPI AllocSplStr(PCWSTR pwszInput)
Definition: memory.c:56
PDWORD WINAPI UndoAlignRpcPtr(PVOID pDestinationBuffer, PVOID pSourceBuffer, DWORD cbBuffer, PDWORD pcbNeeded)
Definition: memory.c:239
BOOL WINAPI ReallocSplStr(PWSTR *ppwszString, PCWSTR pwszInput)
Definition: memory.c:195
#define CopyMemory
Definition: winbase.h:1710
_In_ DWORD _Out_ PDWORD pcbNeeded
Definition: winddi.h:3828
#define WINAPI
Definition: msvc.h:6
__wchar_t WCHAR
Definition: xmlstorage.h:180