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obs-studio/plugins/win-capture/funchook.h

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win-capture: Add hooking functions These functions allow the safe hooking of windows functions, specifically windows API functions that may or may not have built-in machine code to help aid in reverse chain hooks. If a new hook is applied to an existing forward hook, that hook will be preserved to prevent that new hook's data from being removed unintentionally. Hopefully with all these precautions this will reduce the likelihood of crashes and abnormal hook behavior, while allowing existing hooks to be preserved, and allowing new hooks to be applied.
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#pragma once
#include <stdbool.h>
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#else
win-capture: Use inline define with VC only mingw already supports the regular inline keyword in C; VC does not.
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#if defined(_MSC_VER) && !defined(inline)
win-capture: Add hooking functions These functions allow the safe hooking of windows functions, specifically windows API functions that may or may not have built-in machine code to help aid in reverse chain hooks. If a new hook is applied to an existing forward hook, that hook will be preserved to prevent that new hook's data from being removed unintentionally. Hopefully with all these precautions this will reduce the likelihood of crashes and abnormal hook behavior, while allowing existing hooks to be preserved, and allowing new hooks to be applied.
2014-11-10 01:40:15 -08:00
#define inline __inline
#endif
#endif
enum hook_type {
HOOKTYPE_FORWARD_OVERWRITE,
HOOKTYPE_FORWARD_CHAIN,
HOOKTYPE_REVERSE_CHAIN
};
struct func_hook {
clang-format: Apply formatting Code submissions have continually suffered from formatting inconsistencies that constantly have to be addressed. Using clang-format simplifies this by making code formatting more consistent, and allows automation of the code formatting so that maintainers can focus more on the code itself instead of code formatting.
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void *call_addr;
uintptr_t func_addr; /* function being hooked to */
uintptr_t hook_addr; /* hook function itself */
void *bounce_addr;
const char *name;
enum hook_type type;
bool is_64bit_jump;
bool hooked;
bool started;
bool attempted_bounce;
uint8_t unhook_data[14];
uint8_t rehook_data[14];
win-capture: Add hooking functions These functions allow the safe hooking of windows functions, specifically windows API functions that may or may not have built-in machine code to help aid in reverse chain hooks. If a new hook is applied to an existing forward hook, that hook will be preserved to prevent that new hook's data from being removed unintentionally. Hopefully with all these precautions this will reduce the likelihood of crashes and abnormal hook behavior, while allowing existing hooks to be preserved, and allowing new hooks to be applied.
2014-11-10 01:40:15 -08:00
};
clang-format: Apply formatting Code submissions have continually suffered from formatting inconsistencies that constantly have to be addressed. Using clang-format simplifies this by making code formatting more consistent, and allows automation of the code formatting so that maintainers can focus more on the code itself instead of code formatting.
2019-06-22 22:13:45 -07:00
extern void hook_init(struct func_hook *hook, void *func_addr, void *hook_addr,
const char *name);
win-capture: Add hooking functions These functions allow the safe hooking of windows functions, specifically windows API functions that may or may not have built-in machine code to help aid in reverse chain hooks. If a new hook is applied to an existing forward hook, that hook will be preserved to prevent that new hook's data from being removed unintentionally. Hopefully with all these precautions this will reduce the likelihood of crashes and abnormal hook behavior, while allowing existing hooks to be preserved, and allowing new hooks to be applied.
2014-11-10 01:40:15 -08:00
extern void hook_start(struct func_hook *hook);
extern void do_hook(struct func_hook *hook, bool force);
extern void unhook(struct func_hook *hook);
static inline void rehook(struct func_hook *hook)
{
do_hook(hook, false);
}
static inline void force_rehook(struct func_hook *hook)
{
do_hook(hook, true);
}
#ifdef __cplusplus
}
#endif