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08048f26 <transform>: 8048f26: 55 push %ebp 8048f27: 89 e5 mov %esp,%ebp 8048f29: 83 ec 28 sub $0x28,%esp 8048f2c: c7 45 f8 0e 00 00 00 movl $0xe,0xfffffff8(%ebp) 8048f33: 8b 45 f8 mov 0xfffffff8(%ebp),%eax 8048f36: 01 c0 add %eax,%eax 8048f38: 89 45 fc mov %eax,0xfffffffc(%ebp) 8048f3b: 8b 45 08 mov 0x8(%ebp),%eax 8048f3e: 83 e8 71 sub $0x71,%eax 8048f41: 89 45 ec mov %eax,0xffffffec(%ebp) 8048f44: 83 7d ec 0a cmpl $0xa,0xffffffec(%ebp) 8048f48: 77 7d ja 8048fc7 <transform+0xa1> 8048f4a: 8b 55 ec mov 0xffffffec(%ebp),%edx 8048f4d: 8b 04 95 28 a3 04 08 mov 0x804a328(,%edx,4),%eax 8048f54: ff e0 jmp *%eax 8048f56: c7 45 fc 39 00 00 00 movl $0x39,0xfffffffc(%ebp) 8048f5d: e8 1e 10 00 00 call 8049f80 <explode_bomb> 8048f62: c7 45 fc 4b 00 00 00 movl $0x4b,0xfffffffc(%ebp) 8048f69: 8b 45 f8 mov 0xfffffff8(%ebp),%eax 8048f6c: 6b c0 64 imul $0x64,%eax,%eax 8048f6f: 89 45 f8 mov %eax,0xfffffff8(%ebp) 8048f72: e9 81 00 00 00 jmp 8048ff8 <transform+0xd2> 8048f77: 8b 45 f8 mov 0xfffffff8(%ebp),%eax 8048f7a: 89 c2 mov %eax,%edx 8048f7c: c1 e2 02 shl $0x2,%edx 8048f7f: 01 c2 add %eax,%edx 8048f81: 8d 04 d5 00 00 00 00 lea 0x0(,%edx,8),%eax 8048f88: 89 45 f8 mov %eax,0xfffffff8(%ebp) 8048f8b: 8b 55 f8 mov 0xfffffff8(%ebp),%edx 8048f8e: 89 d0 mov %edx,%eax 8048f90: c1 e8 1f shr $0x1f,%eax 8048f93: 01 d0 add %edx,%eax 8048f95: d1 f8 sar %eax 8048f97: 89 45 f8 mov %eax,0xfffffff8(%ebp) 8048f9a: c7 45 fc 5a 00 00 00 movl $0x5a,0xfffffffc(%ebp) 8048fa1: eb 55 jmp 8048ff8 <transform+0xd2> 8048fa3: c7 45 fc 8b ff ff ff movl $0xffffff8b,0xfffffffc(%ebp) 8048faa: f7 5d f8 negl 0xfffffff8(%ebp) 8048fad: f7 5d fc negl 0xfffffffc(%ebp) 8048fb0: e8 cb 0f 00 00 call 8049f80 <explode_bomb> 8048fb5: 83 6d f8 36 subl $0x36,0xfffffff8(%ebp) 8048fb9: 8b 45 08 mov 0x8(%ebp),%eax 8048fbc: 01 45 f8 add %eax,0xfffffff8(%ebp) 8048fbf: 8b 45 fc mov 0xfffffffc(%ebp),%eax 8048fc2: 29 45 f8 sub %eax,0xfffffff8(%ebp) 8048fc5: eb 31 jmp 8048ff8 <transform+0xd2> 8048fc7: 8b 45 08 mov 0x8(%ebp),%eax 8048fca: 89 45 e8 mov %eax,0xffffffe8(%ebp) 8048fcd: c7 45 e4 56 55 55 55 movl $0x55555556,0xffffffe4(%ebp) 8048fd4: 8b 45 e4 mov 0xffffffe4(%ebp),%eax 8048fd7: f7 6d e8 imull 0xffffffe8(%ebp) 8048fda: 89 d1 mov %edx,%ecx 8048fdc: 8b 45 e8 mov 0xffffffe8(%ebp),%eax 8048fdf: c1 f8 1f sar $0x1f,%eax 8048fe2: 89 ca mov %ecx,%edx 8048fe4: 29 c2 sub %eax,%edx 8048fe6: 8b 45 fc mov 0xfffffffc(%ebp),%eax 8048fe9: 03 45 f8 add 0xfffffff8(%ebp),%eax 8048fec: 8d 04 02 lea (%edx,%eax,1),%eax 8048fef: 89 45 f8 mov %eax,0xfffffff8(%ebp) 8048ff2: 8b 45 fc mov 0xfffffffc(%ebp),%eax 8048ff5: 01 45 f8 add %eax,0xfffffff8(%ebp) 8048ff8: 8b 55 fc mov 0xfffffffc(%ebp),%edx 8048ffb: 8b 45 f8 mov 0xfffffff8(%ebp),%eax 8048ffe: 29 d0 sub %edx,%eax 8049000: c9 leave 8049001: c3 ret 08049002 <level_4>: 8049002: 55 push %ebp 8049003: 89 e5 mov %esp,%ebp 8049005: 83 ec 28 sub $0x28,%esp 8049008: 8d 45 fc lea 0xfffffffc(%ebp),%eax 804900b: 89 44 24 08 mov %eax,0x8(%esp) 804900f: c7 44 24 04 54 a3 04 movl $0x804a354,0x4(%esp) 8049016: 08 8049017: 8b 45 08 mov 0x8(%ebp),%eax 804901a: 89 04 24 mov %eax,(%esp) 804901d: e8 ee fa ff ff call 8048b10 <sscanf@plt> 8049022: 83 f8 01 cmp $0x1,%eax 8049025: 74 05 je 804902c <level_4+0x2a> 8049027: e8 54 0f 00 00 call 8049f80 <explode_bomb> 804902c: 8b 45 fc mov 0xfffffffc(%ebp),%eax 804902f: 89 04 24 mov %eax,(%esp) 8049032: e8 ef fe ff ff call 8048f26 <transform> 8049037: 89 04 24 mov %eax,(%esp) 804903a: e8 e7 fe ff ff call 8048f26 <transform> 804903f: 85 c0 test %eax,%eax 8049041: 78 05 js 8049048 <level_4+0x46> 8049043: e8 38 0f 00 00 call 8049f80 <explode_bomb> 8049048: c9 leave 8049049: c3 ret
At this point I know that sscanf takes in an integer and that integer is taken through transform. In the end of that if that integer turns out to be negative then this is solved. My question is what exactly is going on in transform. It seems to be a bunch of math being applied to the number through recursion. I'm not sure in what order. I just need some clarification or if i'm missing something that would make this a bit easier to understand.
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