Revert "Move sources and headers to src and include"v0.1

This reverts commit 48e7a711aedbf25ead8f0f7c83f3ea3b997f7137.

1 files changed, 113 insertions, 0 deletions

diff --git a/subhook_x86.c b/subhook_x86.c
new file mode 100644
index 0000000..4f03c7b
--- /dev/null
+++ b/subhook_x86.c
@@ -0,0 +1,113 @@
+/* Copyright (c) 2012-2013 Zeex
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <errno.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+
+#if defined _MSC_VER
+	typedef __int32 int32_t;
+	#if defined SUBHOOK_X86
+		typedef __int32 intptr_t;
+	#elif defined SUBHOOK_X86_64
+		typedef __int64 intptr_t;
+	#endif
+#else
+	#include <stdint.h>
+#endif
+
+#include "subhook.h"
+#include "subhook_private.h"
+
+#define JMP_OPCODE 0xE9
+
+static const unsigned char jmp_opcode = JMP_OPCODE;
+static const unsigned char jmp_instr[] = { JMP_OPCODE, 0x0, 0x0, 0x0, 0x0 };
+
+struct subhook_x86 {
+	struct subhook _;
+	unsigned char code[sizeof(jmp_instr)];
+};
+
+SUBHOOK_EXPORT subhook_t SUBHOOK_API subhook_new() {
+	struct subhook_x86 *hook;
+
+	if ((hook = calloc(1, sizeof(*hook))) == NULL)
+		return NULL;
+
+	return (subhook_t)hook;
+}
+
+SUBHOOK_EXPORT void SUBHOOK_API subhook_free(subhook_t hook) {
+	free(hook);
+}
+
+SUBHOOK_EXPORT int SUBHOOK_API subhook_install(subhook_t hook) {
+	void *src;
+	void *dst;
+	intptr_t offset;
+
+	if (hook->installed)
+		return -EINVAL;
+
+	src = hook->src;
+	dst = hook->dst;
+
+	subhook_unprotect(src, sizeof(jmp_instr));
+	memcpy(((struct subhook_x86 *)hook)->code, src, sizeof(jmp_instr));
+	memcpy(src, &jmp_instr, sizeof(jmp_instr));
+
+	offset = (intptr_t)dst - ((intptr_t)src + sizeof(jmp_instr));
+	memcpy((void *)((intptr_t)src + sizeof(jmp_opcode)), &offset,
+	       sizeof(jmp_instr) - sizeof(jmp_opcode));
+
+	hook->installed = 1;
+	return 0;
+}
+
+SUBHOOK_EXPORT int SUBHOOK_API subhook_remove(subhook_t hook) {
+	if (!hook->installed)
+		return -EINVAL;
+
+	memcpy(hook->src, ((struct subhook_x86 *)hook)->code,
+	       sizeof(jmp_instr));
+
+	hook->installed = 0;
+	return 0;
+}
+
+SUBHOOK_EXPORT void *SUBHOOK_API subhook_read_dst(void *src) {
+	unsigned char opcode;
+	int32_t offset;
+
+	memcpy(&opcode, src, sizeof(opcode));
+	if (opcode != jmp_opcode)
+		return NULL;
+
+	memcpy(&offset, (void *)((intptr_t)src + sizeof(jmp_opcode)),
+	       sizeof(offset));
+	return (void *)(offset + (intptr_t)src + sizeof(jmp_instr));
+}