added partial memory api for windows

src/win/memory.c

@@ -0,0 +1,134 @@
+/*
+ *  ----------------------------------
+ * |         libmem - by rdbo         |
+ * |      Memory Hacking Library      |
+ *  ----------------------------------
+ */
+
+/*
+ * Copyright (C) 2023    Rdbo
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License version 3
+ * as published by the Free Software Foundation.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <libmem/libmem.h>
+#include <windows.h>
+
+LM_API lm_size_t LM_CALL
+LM_ReadMemoryEx(const lm_process_t *process,
+		lm_address_t        source,
+		lm_byte_t          *dest,
+		lm_size_t           size)
+{
+	HANDLE hproc;
+	SIZE_T bytes_read;
+
+	if (!process || source == LM_ADDRESS_BAD || !dest || size == 0)
+		return 0;
+
+	hproc = open_process(process->pid, PROCESS_VM_READ);
+	if (!hproc)
+		return 0;
+
+	if (!ReadProcessMemory(hproc, source, dest, size, &bytes_read))
+		bytes_read = 0;
+
+	close_handle(hproc);
+	return (lm_size_t)bytes_read;
+}
+
+/********************************/
+
+LM_API lm_size_t LM_CALL
+LM_WriteMemoryEx(const lm_process_t *process,
+		 lm_address_t        dest,
+		 lm_bytearray_t      source,
+		 lm_size_t           size)
+{
+	HANDLE hproc;
+	SIZE_T bytes_written;
+
+	if (!process || dest == LM_ADDRESS_BAD || !source || size == 0)
+		return 0;
+
+	hproc = open_process(process->pid, PROCESS_VM_WRITE | PROCESS_VM_OPERATION);
+	if (!hproc)
+		return 0;
+
+	if (!WriteProcessMemory(hproc, dest, source, size, &bytes_written))
+		bytes_written = 0;
+
+	close_handle(hproc);
+	return (lm_size_t)bytes_written;
+}
+
+/********************************/
+
+LM_API lm_bool_t LM_CALL
+LM_ProtMemory(lm_address_t address,
+	      lm_size_t    size,
+	      lm_prot_t    prot,
+	      lm_prot_t   *oldprot_out)
+{
+	DWORD osprot;
+	DWORD old_osprot;
+
+	if (address == LM_ADDRESS_BAD || !LM_CHECK_PROT(prot))
+		return LM_FALSE;
+
+	osprot = get_os_prot(prot);
+	if (!VirtualProtect(address, size, osprot, &old_osprot))
+		return LM_FALSE;
+
+	if (oldprot_out)
+		*oldprot_out = get_prot(old_osprot);
+
+	return LM_TRUE;
+}
+
+/********************************/
+
+LM_API lm_address_t LM_CALL
+LM_AllocMemory(lm_size_t size,
+	       lm_prot_t prot)
+{
+	DWORD osprot;
+	LPVOID alloc;
+
+	if (!LM_CHECK_PROT(prot))
+		return LM_ADDRESS_BAD;
+
+	osprot = get_os_prot(prot);
+	alloc = VirtualAlloc(NULL, size, MEM_COMMIT | MEM_RESERVE, osprot);
+	if (!alloc)
+		return LM_ADDRESS_BAD;
+
+	return (lm_address_t)alloc;
+}
+
+/********************************/
+
+LM_API lm_bool_t LM_CALL
+LM_FreeMemory(lm_address_t alloc,
+	      lm_size_t    size)
+{
+	/*
+	 * From https://learn.microsoft.com/en-us/windows/win32/api/memoryapi/nf-memoryapi-virtualfree:
+	 *
+	 * "If the dwFreeType parameter is MEM_RELEASE, this parameter must be 0 (zero).
+	 *  The function frees the entire region that is reserved in the initial
+	 *  allocation call to VirtualAlloc."
+	 */
+
+	size = 0;
+	return VirtualFree(alloc, size, MEM_RELEASE) ? LM_TRUE : LM_FALSE;
+}

src/win/osprot.c

@@ -0,0 +1,60 @@
+/*
+ *  ----------------------------------
+ * |         libmem - by rdbo         |
+ * |      Memory Hacking Library      |
+ *  ----------------------------------
+ */
+
+/*
+ * Copyright (C) 2023    Rdbo
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License version 3
+ * as published by the Free Software Foundation.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "osprot.h"
+#include <sys/mman.h>
+
+DWORD
+get_os_prot(lm_prot_t prot)
+{
+	DWORD osprot = 0;
+
+	switch (prot) {
+	case LM_PROT_X:   osprot = PAGE_EXECUTE;
+	case LM_PROT_R:   osprot = PAGE_READONLY;
+	case LM_PROT_W:   osprot = PAGE_WRITECOPY;
+	case LM_PROT_XR:  osprot = PAGE_EXECUTE_READ;
+	case LM_PROT_XW:  osprot = PAGE_EXECUTE_WRITECOPY;
+	case LM_PROT_RW:  osprot = PAGE_READWRITE;
+	case LM_PROT_XRW: osprot = PAGE_EXECUTE_READWRITE;
+	}
+
+	return osprot;
+}
+
+lm_prot_t
+get_prot(DWORD osprot)
+{
+	lm_prot_t prot = LM_PROT_NONE;
+
+	switch (osprot) {
+	case PAGE_EXECUTE:           prot = LM_PROT_X;
+	case PAGE_READONLY:          prot = LM_PROT_R;
+	case PAGE_WRITECOPY:         prot = LM_PROT_W;
+	case PAGE_EXECUTE_READ:      prot = LM_PROT_XR;
+	case PAGE_EXECUTE_WRITECOPY: prot = LM_PROT_XW;
+	case PAGE_READWRITE:         prot = LM_PROT_RW;
+	case PAGE_EXECUTE_READWRITE: prot = LM_PROT_XRW;
+	}
+
+	return prot;
+}

src/win/osprot.h

@@ -0,0 +1,37 @@
+/*
+ *  ----------------------------------
+ * |         libmem - by rdbo         |
+ * |      Memory Hacking Library      |
+ *  ----------------------------------
+ */
+
+/*
+ * Copyright (C) 2023    Rdbo
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License version 3
+ * as published by the Free Software Foundation.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/* TODO: Merge 'osprot.h' and 'osprot.c' for Linux and FreeBSD */
+
+#ifndef OSPROT_H
+#define OSPROT_H
+
+#include <libmem/libmem.h>
+#include <windows.h>
+
+DWORD
+get_os_prot(lm_prot_t prot);
+
+lm_prot_t
+get_prot(DWORD osprot);
+
+#endif