如何将java中负数转化为无符号类型32位的，与c中执行的结果不一样，请高手指点
下面分别是两段java和c当中的代码，其中java代码是从c中移植过来的，执行结果不一样，导致出现的原因是：在java中不存在无符号类型32位，所以导致结果不一样，请高手指点一二，谢谢！

#include <string.h>#include <stdio.h>#ifndef FALSE   /* in case these macros already exist */#define FALSE 0  /* values of boolean */#endif#ifndef TRUE#define TRUE 1#endiftypedef signed char ascii;typedef unsigned char           u8;typedef unsigned long int       u32;#define min(a, b) (a)<(b)?(a):(b)#define SPE_SIMLOCK_TRACE printf#define SIMLOOK_SPE_ICCID_LEN 20#define SIMLOOK_SPE_PIC_PSW_LEN 16static u8 SIMLOOKGenPICPSW(ascii *sSrc, u8 nSrcLen, ascii *sDec, u8 nDecLen){    u8 i = 0;    u8 l = 0;    u8 tmp = 0;    u8 vPSW[SIMLOOK_SPE_PIC_PSW_LEN+1] = {0};u8 vTmpSrc[SIMLOOK_SPE_ICCID_LEN+1] = {0};    u32 data1 = 0, data2 = 0, decData1 = 0, decData2;    static u8 seed[] = "4589652157125675";    if ((!sSrc) || (!sDec)||        (6/*最小长度为6位*/ > nSrcLen) || ((SIMLOOK_SPE_PIC_PSW_LEN+1) > nDecLen))    {        return -1;    }tmp = strlen((const char *)sSrc);tmp = min(tmp, nSrcLen);/*不足20位前面补0*/if (tmp < SIMLOOK_SPE_ICCID_LEN){for(i = 0;i<(SIMLOOK_SPE_ICCID_LEN-tmp);i++){vTmpSrc[i] = '0';}strncpy((char*)(vTmpSrc+i), (const char*)sSrc, tmp);}else{/*超过20位的后面丢弃*/strncpy((char*)vTmpSrc, (const char*)sSrc, SIMLOOK_SPE_ICCID_LEN);}vTmpSrc[SIMLOOK_SPE_ICCID_LEN] = '\0';    i = 4;/*前4 位跳过*/    while(i<SIMLOOK_SPE_ICCID_LEN)    {        vPSW[l] = vTmpSrc[i]^seed[l];        if ((vTmpSrc[i] > '9') || (vTmpSrc[i] < '0'))        {            /*把非数字字符转换成数字*/            vPSW[l] = vTmpSrc[i]&0x07;        }        /*转换成数值前,保证最高位非0*/        if (vPSW[0] == '0')        {            vPSW[0] = '2';        }        if (vPSW[(SIMLOOK_SPE_PIC_PSW_LEN/2)] == '0')        {            vPSW[(SIMLOOK_SPE_PIC_PSW_LEN/2)] = '6';        }        i++;l++;    }    SPE_SIMLOCK_TRACE("vPSW = %s\n", vPSW);    i = 0;    /*把16位字符串转换成两个数值*/    while(i<(SIMLOOK_SPE_PIC_PSW_LEN/2))    {        data2 = data2*10+(vPSW[i] - '0');        data1 = data1*10+(vPSW[i+(SIMLOOK_SPE_PIC_PSW_LEN/2)] - '0');        i++;    }    /*对数值进行与，异或*/    decData1 = data1&data2;    decData2 = data1^data2;    SPE_SIMLOCK_TRACE("data1 = %d, data2 = %d\n", data1, data2);    SPE_SIMLOCK_TRACE("decData1 = %d, decData2 = %d\n", decData1, decData2);    i= 0;    /*再把数值转换成字符串*/    while(i<(SIMLOOK_SPE_PIC_PSW_LEN/2))    {        tmp = (u8)(decData1%10);        sDec[i] = tmp + '0';        decData1 = decData1/10;         tmp = (u8)(decData2%10);        sDec[i+(SIMLOOK_SPE_PIC_PSW_LEN/2)] = tmp + '0';        decData2 = decData2/10;         i++;    }        sDec[SIMLOOK_SPE_PIC_PSW_LEN] = '\0';    SPE_SIMLOCK_TRACE("----sDec = %s\n", sDec);    return TRUE;}