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;}