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stack overflow

dante300981 (12)
My program is a decompression routine used to decompress compressed art. The problem is that when I try to decompress any compressed art with more than 0xEFF bytes I get this error. Anything below 0xEFF bytes decompresses perfectly. Anyway to fix this.

First-chance exception at 0x10240a97 in EPSDec.exe: 0xC00000FD: Stack overflow.

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#include<iostream>
#include<fstream>

using namespace std;

void loc_2AD6();
void loc_2B34();
void loc_2AEE();
void loc_2B14();
void loc_2B02();
void sub_2ABC();

fstream a1("ESPArt.bin", ios::in | ios::binary);
fstream a2("ArtDec.bin", ios::out | ios::in | ios::binary |ios::trunc);

//Global Variables

int d4;
unsigned long length1;
unsigned short d5;
unsigned char d5Temp;
unsigned short d6Temp;
unsigned short d52;
unsigned char d6;
unsigned char d7;
unsigned short BIT5;
unsigned short BIT6;
unsigned short SIZECOMPRESS;
unsigned char byte_value;
unsigned char CompByte1;
unsigned char CompByte3;
int length;
long offset;
long pos8;
long posA2;
long posA22;
long pos3;
/////////////////////////////////////////////////

int main(){
cout  <<  "Enter Offset ";
cin >> hex >> offset;
a1.seekg (offset);
SIZECOMPRESS = a1.get()<< 8;
SIZECOMPRESS |= a1.get();
pos8 = a1.tellg();
pos8 = pos8+SIZECOMPRESS;
{sub_2ABC();}}
////////////////////////////////////////////////
void sub_2ABC(){
//a1.seekg (0, ios::cur);
length1 = a1.tellg();
if(length1 == pos8)
a2.close();
else goto
CONT;
CONT:
d5Temp = a1.get();
SIZECOMPRESS--;
d5 = d5 & 0xFF00 | d5Temp;
if(d5 >= 0xFF80)
{loc_2B14();}
else goto
Continue;
Continue:
BIT5 = d5 & 0x20;
BIT6 = d5 & 0x40;
if(BIT5 != 0x0)
{loc_2AD6();}
else if(BIT6 == 0x0)
{loc_2B34();}
else
{loc_2AEE();}
}
/////////////////////////////////////////////////
void loc_2AD6(){
BIT6 = d5 & 0x40;
if(BIT6 != 0x0)
{loc_2B02();}
else goto
Continue;
Continue:
d5 =d5 & 0x1f;
d5++;
d6 = a1.get();
SIZECOMPRESS--;
do{
a2.put(d6);
d5--;
}while(d5 != 0xffff);
{sub_2ABC();}
}
/////////////////////////////////////////////////
void loc_2AEE(){
d5 = d5 & 0x1f;
d5++;
d6 = a1.get();
SIZECOMPRESS--;
d7 = a1.get();
SIZECOMPRESS--;
do{
a2.put(d6);
a2.put(d7);
d5--;
}while(d5 != 0xFFFF);
{sub_2ABC();}
}
/////////////////////////////////////////////////
void loc_2B02(){
//d5Temp = d5 & 0x0000 | d5;
d5 = d5 & 0x1f;
d5++;
d6 = a1.get();
SIZECOMPRESS--;
CompByte1;
do{
a2.put(d6);
CompByte1 = a1.get();
SIZECOMPRESS--;
a2.put(CompByte1);
d5--;
}while (d5 != 0xFFFF);
{sub_2ABC();}
}
/////////////////////////////////////////////////
void loc_2B14(){
d6 = d5;
d5 = d5 & 0xFF00 | ((d5 & 0xFF) >> 2);
d5 = d5 & 0x1f;
d5++;
//unsigned short d6Temp;
d52 =d5;
d6Temp= d6 << 8;
d6Temp = d6Temp & 0xFF00 | (unsigned char) a1.get();
d6Temp = d6Temp & 0x3ff;
d6Temp++;
do{
posA2 = a2.tellg();/// Get First-chance exception at 0x10240a97 in EPSDec.exe: 0xC00000FD: Stack overflow.
posA22 = posA2;
posA22 = posA22 - d6Temp;
a2.seekp (posA22);
CompByte1 = a2.get();
a2.seekp (posA2);
a2.put (CompByte1);
d5--;
}while(d5 != 0xFFFF);
{sub_2ABC();}}
/////////////////////////////////////////////////
void loc_2B34(){
pos3 = a2.tellg();
d5 = d5 & 0x1f;
//CompByte3;
do{
CompByte1=a1.get();
SIZECOMPRESS--;
a2.put(CompByte1);
d5--;
}while(d5 != 0xFFFF);
{sub_2ABC();}
}
Last edited on
Zaita (2770)
Unfortunately, your going to have to trace through the execution with a debugger and some breakpoints to try and isolate th section of code causing a problem. Then we maybe able to help you.
closed account (z05DSL3A)
Any chance of formatting your code, it is quite hard to follow?
dante300981 (12)
Never mind I fixed it. Seems sub_2ABC was called recursively. I've edited so the whole routine is a single function and used goto to branch
Zaita (2770)
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if(BIT6 != 0x0) {
 loc_2B02();
} else goto
 Continue;
Continue:


This piece of code scares me.
guestgulkan (2942)
It looks like those functions are calling each other in a very strange way- I don't any of them are managing to return at all.

The last line of all the functions (except sub_2ABC )is a call to sub_2ABC() .

So:
1.Main calls Sub_2ABC()
2. sub_2ABC() which at at some point will call one of the other functions.
3. All of the other functions end in a call back to sub_2ABC() - so we are back to step 2.

stack overflow.


Edit: I need to type faster.
Last edited on
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