[C语言] 文件操作，解压华为官方固件UNDATE.APP工具（源代码）；

/** =====================================================================================**       Filename:  unpack.c**    Description:  仅作为代码分享，转载请注明作者

 *　　　　　　　　　　（相对于把整大块文件读入内存，此程序运行时对系统开销比较小的特点）；**        Version:  1.0*        Created:  2013年03月28日 22时34分52秒*       Revision:  none*       Compiler:  gcc**         Author:  linkscue (scue), *   Organization:  ** =====================================================================================*/#include    
#include    
#include    
#define u8 unsigned char
#define u32 unsigned int
#define u16 unsigned short
#define BUFFER_SIZE 4/* * u32  magic* u32  paket_size* u32  flag=0x1* u8   Hardware[8]* u32  Filetype* u32  data_size* u8   date[16]* u8   time[16]* u8   filename[32]* u8   other[paket_size-92]* */int realStrlen(char *string){int i=0;char ch=NULL;while ( (ch = *(string + i)) != 'xFF' ) {i++;}return i;
}
void hello(){printf("
");printf("Welcome to use linkscue unpack huawei official rom tool!
");
}
int main ( int argc, char *argv[] )
{hello();if (argc == 1) {printf("
");printf("usage: %s unpack.app
", argv[0]);exit(0);}char *file;FILE *fp,*fd;u32 tmp;u32 magic=0xa55aaa55;u32 paket_size=0;u32 flag=1;u8  hwid[8]="";u32 filetype=0;u32 data_size=0;u8  date[16]="";u8  time[16]="";u8  filename[32]="";int other_size=0;int number=1;char basename[32]="";char basehwid[8]="";int fp_start=0;int fp_local=0;int i=0,count=0,counts=0;int end_point=0;file=argv[1];if ( (fp=fopen(file,"rb")) == NULL) {printf("open file failure!
",file);exit(1);}printf("
");while (!feof(fp)) {fscanf(fp, "%4c", &tmp);if (tmp == magic) {fp_start=(ftell(fp)-4);fscanf(fp, "%4c",&paket_size);fscanf(fp, "%4c",&flag);fscanf(fp, "%8c",&hwid);fscanf(fp, "%4c",&filetype);fscanf(fp, "%4c",&data_size);fscanf(fp, "%16c",&date);fscanf(fp, "%16c",&time);fscanf(fp, "%32c",&filename);other_size=( paket_size - 92 );fseek(fp, other_size, SEEK_CUR);if ( strcmp(filename,"INPUT") == 0 ) {sprintf(basename, "output_%02d.img", number);strncpy(filename, basename, sizeof(filename));number++;}
//            if ( (int)paket_size <= 0 || (int)data_size <= 0) {
//                continue;
//            }
            strncpy(basehwid, hwid , realStrlen(hwid));printf("At: 0x%08x hw: %s size: %-10d time: %s_%s -->  %s
", fp_start, basehwid, data_size, date, time, filename);if ((fd=fopen(filename,"wb"))==NULL) {printf("open %s to write data failure!
", filename);fseek(fp, 88, SEEK_CUR);continue;}u8 buffer[BUFFER_SIZE];counts = 0;while ( counts < data_size ){if (feof(fp)) {                 /* if the file is end, break! */break;}count = fread(buffer, 1, BUFFER_SIZE, fp);fwrite(buffer, 1 , BUFFER_SIZE, fd);counts+=count;} 
//            printf("paket size is 0x%08x, count is %d,  data start at 0x%08x, this time end at 0x%08x
", paket_size,counts,  (paket_size+fp_start), ftell(fp));
            fclose(fd);fseek(fp, ( fp_start + 92 ) , SEEK_SET);}}
//    printf("Unpack %s ok!
", file);
    fclose(fp);return EXIT_SUCCESS;
}