某牛人解包器”as-util.h” 逆向代碼

說明下，有一天在Ck還是什麼地方有人求某牛人解包器"as-util.h"

的原始碼

由於作者沒有提供此檔案原始碼，我在分析解包器時候順帶分析了一下

如果沒有你用道的函數，只能說抱歉了

可以作為C語言愛好者學習使用 這個類

//"common.h"//This code  is  write without author's permission.//Reverse by 大師♂羅莊(luozhuang)//http://blog.csdn.net/luozhuang// Generic utilities in "as-util.h"//*****************************************************************************//-----------------------------------------------------------------------------// open_or_die//-----------------------------------------------------------------------------int open_or_die(const std::string& filename, int flags, int mode = 0);int write_file(const std::string& filename, const void* buff, unsigned int len);int write_bmp(const    std::string& filename,               unsigned char*   buff,               unsigned long    len,               unsigned long    width,               unsigned long    height,               unsigned short   depth_bytes);//-----------------------------------------------------------------------------// get_file_size//-----------------------------------------------------------------------------unsigned long get_file_size(int fd);//-----------------------------------------------------------------------------// get_file_prefix//-----------------------------------------------------------------------------std::string get_file_prefix(const std::string& filename);//-----------------------------------------------------------------------------// get_file_extension//-----------------------------------------------------------------------------std::string get_file_extension(const std::string& filename);//-----------------------------------------------------------------------------// flip_endian//-----------------------------------------------------------------------------unsigned long flip_endian(unsigned long x);

非windows系統編譯需要下面內容：

//This code  is  write without author's permission.//Reverse by 大師♂羅莊(luozhuang)//http://blog.csdn.net/luozhuang#ifndef _WINGDI_typedef unsigned char BYTE;typedef int WINBOOL,*PWINBOOL,*LPWINBOOL;typedef WINBOOL BOOL;typedef BOOL *PBOOL,*LPBOOL;typedef unsigned short WORD;typedef float FLOAT;typedef unsigned long DWORD;typedef char CHAR;typedef short SHORT;typedef long LONG;typedef struct tagBITMAPFILEHEADER {WORDbfType;DWORDbfSize;WORDbfReserved1;WORDbfReserved2;DWORDbfOffBits;} BITMAPFILEHEADER,*LPBITMAPFILEHEADER,*PBITMAPFILEHEADER;typedef struct tagBITMAPINFOHEADER{DWORDbiSize;LONGbiWidth;LONGbiHeight;WORDbiPlanes;WORDbiBitCount;DWORDbiCompression;DWORDbiSizeImage;LONGbiXPelsPerMeter;LONGbiYPelsPerMeter;DWORDbiClrUsed;DWORDbiClrImportant;} BITMAPINFOHEADER,*LPBITMAPINFOHEADER,*PBITMAPINFOHEADER;#endif#endif /* __ARC4COMMON_H__ */

源檔案：

//This code  is not write in author's permission.//Reverse by 大師♂羅莊(luozhuang)//http://blog.csdn.net/luozhuang// This is a set of common functionality in "as-util.h"#include "common.h"#include <cmath>using std::string;using namespace std;//*****************************************************************************// Generic utilities//*****************************************************************************//-----------------------------------------------------------------------------// open_or_die//-----------------------------------------------------------------------------int open_or_die(const string& filename, int flags, int mode) {  int fd = open(filename.c_str(), flags, mode);  if (fd == -1) {    fprintf(stderr, "Could not open %s (%s)\n", filename.c_str(), strerror(errno));    exit(-1);  }  return fd;}int write_file(const string& filename, const void* buff, unsigned int len){  int v3;   v3 = open_or_die(filename, 33537, 384);  write(v3, buff, len);  return close(v3);}int write_bmp(const    string& filename,               unsigned char*   buff,               unsigned long    len,               unsigned long    width,               unsigned long    height,               unsigned short   depth_bytes){  BITMAPFILEHEADER bmf;  BITMAPINFOHEADER bmi;  memset(&bmf, 0, sizeof(bmf));  memset(&bmi, 0, sizeof(bmi));  bmf.bfType     = 0x4D42;  bmf.bfSize     = sizeof(bmf) + sizeof(bmi) + len;  bmf.bfOffBits  = sizeof(bmf) + sizeof(bmi);  bmi.biSize     = sizeof(bmi);  bmi.biWidth    = width;  bmi.biHeight   = height;  bmi.biPlanes   = 1;  bmi.biBitCount = depth_bytes * 8;             int fd = open_or_die(filename + ".bmp",                        O_CREAT | O_TRUNC | O_WRONLY | O_BINARY,                       S_IREAD | S_IWRITE);  write(fd, &bmf, sizeof(bmf));  write(fd, &bmi, sizeof(bmi));  write(fd, buff, len);  return close(fd);}//-----------------------------------------------------------------------------// get_file_size//-----------------------------------------------------------------------------unsigned long get_file_size(int fd) {  struct stat file_stat;  fstat(fd, &file_stat);  return file_stat.st_size;}//-----------------------------------------------------------------------------// get_file_prefix//-----------------------------------------------------------------------------string get_file_prefix(const std::string& filename) {  string temp(filename);  string::size_type pos = temp.find_last_of(".");  if (pos != string::npos) {    temp = temp.substr(0, pos);  }  return temp;}//-----------------------------------------------------------------------------// get_file_prefix//-----------------------------------------------------------------------------string get_file_extension(const std::string& filename) {  string temp;  string::size_type pos = filename.find_last_of(".");  if (pos != string::npos) {    temp = filename.substr(pos + 1);  }  return temp;}//-----------------------------------------------------------------------------// flip_endian//-----------------------------------------------------------------------------unsigned long flip_endian(unsigned long x) {  return (x >> 24) | ((x << 8) & 0x00FF0000) | ((x >> 8) & 0x0000FF00) | (x << 24);}