大文件二进制模式下搜索匹配怎么写呢？
4G大小二进制文件，搜索一个起始字符串，搜索一个终止字符串，若条件匹配，也就是说找到一个起始和终止字符串，则复制这段内容生成一个文件，然后重新应用这个算法，直到文件结尾。

这个该怎么写呢？搜索算法到是写了，不过在遍历上出了问题，目前代码如下

while (!feof(inFile))
{
val = fgetc(inFile);
++uCurrentPos;
}
目前是这样遍历文件的，但是会有一个问题，就是遍历的字节数与文件体积不对应，文件是4G，而目前这个只能读出0x70f也就是1807个字节，这是怎么回事呢？我该如何正确实现这个功能？

[解决办法]
_lseeki64
仅供参考

C/C++ code

#include <sys\stat.h>#include <io.h>#include <fcntl.h>#include <share.h>#include <stdlib.h>#include <stdio.h>#include <conio.h>#include <string.h>#define MAX_CLU_BYTES 65536FILE *fo;int fh;__int64 offs,offs1;__int64 rvi64;int rv,wrv;unsigned char buf[MAX_CLU_BYTES];char ofn[_MAX_PATH];char offstr[80];void strcpybutcomma(char *t,char *s) {    char c;    while (1) {        c = *s++;        if (','!=c) *t++ = c;        if (0==c) break;    }}void main(int argc,char **argv) {    if (argc<3) {        printf("Copy File Tail.\n");        printf("Usage:\n");        printf("    cft filename.ext offset_begin[-offset_end]\n");        printf("Copy filename.ext offset_begin[-offset_end] to offset_begin[-offset_end]-filename.ext\n");        printf("Note: Byte at offset_end is NOT included.\n");        printf("Example:\n");        printf("    cft abc.rar 12345\n");        printf("Copy abc.rar offset 12345-end to 12345-abc.rar\n");        printf("    cft abc.rar 123-12345\n");        printf("Copy abc.rar offset 123-12345 to 123-12345-abc.rar\n");        printf("    cft abc.rar 0xAB-0xCD\n");        printf("Copy abc.rar offset 0xAB-0xCD to 0xAB-0xCD-abc.rar\n");        return;    }    strcpybutcomma(offstr,argv[2]);    rv=sscanf(offstr,"%I64i-%I64i",&offs,&offs1);    if (rv==0) {        printf("offset %s is not number\n",argv[2]);        return;    }    fh=_sopen(argv[1],_O_BINARY|_O_RDONLY|_O_RANDOM,_SH_DENYWR);    if (fh==-1) {        printf("_sopen %s errno=%d\n",argv[1],errno);        return;    }    if (rv==1) {        offs1=_filelengthi64(fh);        if (offs1==-1i64) {            printf("%I64=_filelengthi64 errno=%d\n",offs1,errno);            _close(fh);            return;        }    } else {//rv==2        if (offs1<offs) {            printf("%s offset_begin>offset_end error\n",argv[2]);            _close(fh);            return;        }    }    rvi64=_lseeki64(fh,offs,SEEK_SET);    if (rvi64!=offs) {        printf("%I64u=_lseeki64 %I64u errno=%d\n",rvi64,offs,errno);        _close(fh);        return;    }    sprintf(ofn,"%s-",offstr);    strcat(ofn,argv[1]);    fo=fopen(ofn,"wb");    if (fo==NULL) {        _close(fh);        printf("fopen %s error\n",ofn);        return;    }    cprintf("\n%I64u\r",offs);    while (1) {        rv=_read(fh,buf,(unsigned int)__min(offs1-offs,MAX_CLU_BYTES));        if (rv==0) break;//        if (rv<0) {            fclose(fo);            _close(fh);            printf("_read %s offset %I64u error\n",argv[1],offs);            return;        }        wrv=fwrite(buf,1,rv,fo);        if (wrv!=rv) {            fclose(fo);            _close(fh);            printf("fwrite %s error\n",ofn);            return;        } else {            offs+=rv;            cprintf("%I64u\r",offs);            if (offs>=offs1) break;//        }    }    fclose(fo);    _close(fh);    printf("Copy %s offset %s to %s OK.\n",argv[1],argv[2],ofn);}