inline PBYTE detour_skip_jmp(PBYTE pbCode, PVOID *ppGlobals)
{
if (pbCode == NULL) {
return NULL;
}
if (ppGlobals != NULL) {
*ppGlobals = NULL;
}
if (pbCode[0] == 0xff && pbCode[1] == 0x25) { // jmp [+imm32]
// Looks like an import alias jump, then get the code it points to.
PBYTE pbTarget = *(PBYTE *)&pbCode[2];
if (detour_is_imported(pbCode, pbTarget)) {
PBYTE pbNew = *(PBYTE *)pbTarget;
DETOUR_TRACE(("%p->%p: skipped over import table.\n", pbCode, pbNew));
return pbNew;
}
}
else if (pbCode[0] == 0xeb) { // jmp +imm8
// These just started appearing with CL13.
PBYTE pbNew = pbCode + 2 + *(CHAR *)&pbCode[1];
DETOUR_TRACE(("%p->%p: skipped over short jump.\n", pbCode, pbNew));
if (pbNew[0] == 0xe9) { // jmp +imm32
pbCode = pbNew;
pbNew = pbCode + *(INT32 *)&pbCode[1];
DETOUR_TRACE(("%p->%p: skipped over short jump.\n", pbCode, pbNew));
}
return pbNew;
}
return pbCode;
}
inline PBYTE detour_skip_jmp(PBYTE pbCode, PVOID *ppGlobals)
{
if (pbCode == NULL) {
return NULL;
}
if (ppGlobals != NULL) {
*ppGlobals = NULL;
}
// First, skip over the import vector if there is one.
if (pbCode[0] == 0xff && pbCode[1] == 0x25) { // jmp [imm32]
// Looks like an import alias jump, then get the code it points to.
PBYTE pbTarget = *(PBYTE *)&pbCode[2];
if (detour_is_imported(pbCode, pbTarget)) {
PBYTE pbNew = *(PBYTE *)pbTarget;
DETOUR_TRACE(("%p->%p: skipped over import table.\n", pbCode, pbNew));
pbCode = pbNew;
}
}
// Then, skip over a patch jump
if (pbCode[0] == 0xeb) { // jmp +imm8
PBYTE pbNew = pbCode + 2 + *(CHAR *)&pbCode[1];
DETOUR_TRACE(("%p->%p: skipped over short jump.\n", pbCode, pbNew));
pbCode = pbNew;
// Finally, skip over a long jump if it is the target of the patch jump.
if (pbCode[0] == 0xe9) { // jmp +imm32
PBYTE pbNew = pbCode + 5 + *(INT32 *)&pbCode[1];
DETOUR_TRACE(("%p->%p: skipped over long jump.\n", pbCode, pbNew));
pbCode = pbNew;
}
}
return pbCode;
}
