samp-re/bitstream.c

106 lines
1.7 KiB
C
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/* vim: set filetype=c ts=8 noexpandtab: */
#include "common.h"
#include "bitstream.h"
#include "packet.h"
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#include <stdio.h>
__declspec(naked)
void __stdcall BitStream__ctor(
struct CBitStream *this,
char *buffer,
int lengthInBytes,
char copyData)
{
_asm {
pop eax
pop ecx
push eax
mov eax, 0x44D930
jmp eax
}
}
__declspec(naked)
void __stdcall BitStream__dtor(struct CBitStream *this)
{
_asm {
pop eax
pop ecx
push eax
mov eax, 0x44D9B0
jmp eax
}
}
__declspec(naked)
int __stdcall BitStream__Read(struct CBitStream *this, char *out)
{
_asm {
pop eax
pop ecx
push eax
mov eax, 0x44D840
jmp eax
}
}
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int __stdcall Hooked_BitStream__ReadCompressed(
char *out,
unsigned char a,
unsigned char unsignedData)
{
struct CBitStream *this;
unsigned char tmpa, tmpread;
int myReadOffset;
_asm mov this, ecx
tmpa = (a >> 3) - 1;
if (unsignedData) {
unsignedData = 0;
a = 0;
} else {
unsignedData = 0xFF;
a = 0xF0;
}
while (tmpa > 0) {
myReadOffset = this->readOffset + 1;
if (myReadOffset > this->numberOfBitsUsed) {
return 0;
}
if ((0x80 >> this->readOffset) == this->ptrData[myReadOffset]) {
this->readOffset = myReadOffset;
return (int) thiscall3(
(void*) 0x44DA70, this, (int) out, tmpa, 1);
}
this->readOffset = myReadOffset;
out[tmpa] = unsignedData;
tmpa--;
}
if (this->readOffset + 1 > this->numberOfBitsUsed) {
return 0;
}
if (!thiscall1((void*) 0x44D840, this, (int) &tmpread)) { /*readBit*/
return 0;
}
out += 0; /*? esi + ebx but esi should be always 0?*/
if (tmpread) {
if (!thiscall3((void*) 0x44DA70, this, (int) out, 4, 1)) {
return 0;
}
*out |= a;
} else {
if (!thiscall3((void*) 0x44DA70, this, (int) out, 8, 1)) {
return 0;
}
}
return 1;
}