/**
* @brief 扩展一个文件的空间
*
* @param [in/out] head : struct dbSysHead *
* @param [in] fid : long 文件标识
* @param [in] extendPage : long 要扩展的页数
* @return int
*
* @author mengxi
* @date 2015/10/20
**/
int extendFileSpace(struct dbSysHead *head, long fid, int extendPage)
{
long segmentAddr;
struct Segment newSegment;
struct Segment lastSegment;
int allocStaPage;
int i;
int count;
int nPage;
int numPage;
int idx;
numPage = extendPage;
allocStaPage = allocatePage(head, numPage);
if (allocStaPage < 0) {
printf("extendFileSpace error:out of disk space.");
exit(0);
}
segmentAddr = getLastSegmentAddr(head, fid);
getSegmentValue(head, segmentAddr, &lastSegment);
if (lastSegment.count < PAGE_PER_SEGMENT) {
nPage = (numPage < (PAGE_PER_SEGMENT - lastSegment.count)) ? numPage : (PAGE_PER_SEGMENT - lastSegment.count);
count = lastSegment.count;
for (i = 0; i<nPage; i++) {
lastSegment.pageNo[count + i] = allocStaPage;
allocStaPage++;
}
lastSegment.count += nPage;
writeSegmentValue(head, segmentAddr, &lastSegment);
numPage -= nPage;
}
if (numPage > 0) {
while (numPage > 0) {
nPage = (numPage < PAGE_PER_SEGMENT) ? numPage : PAGE_PER_SEGMENT;
initSegment(&newSegment, allocStaPage, nPage, fid, segmentAddr, -1);
allocStaPage += nPage;
lastSegment.nextAddr = (head->desc).segmentAddr + (head->desc).segmentCur * sizeof(struct Segment);
newSegment.preAddr = segmentAddr;
writeSegmentValue(head, segmentAddr, &lastSegment);
segmentAddr = lastSegment.nextAddr;
(head->desc).segmentCur++;
(head->desc).segmentNum++;
lastSegment.count = newSegment.count;
lastSegment.nextAddr = newSegment.nextAddr;
lastSegment.preAddr = newSegment.preAddr;
for (i = 0; i<newSegment.count; i++) {
lastSegment.pageNo[i] = newSegment.pageNo[i];
}
numPage -= nPage;
}
writeSegmentValue(head, segmentAddr, &newSegment);
}
idx = queryFileID(head, fid);
head->desc.fileDesc[idx].filePageNum += extendPage;
return 0;
}
/**
* @brief 创建一个文件，为它分配空间
*
* @param [in/out] head : struct dbSysHead *
* @return int
* @retval 返回文件的标识号，即fid
*
* @author mengxi
* @date 2015/10/20
**/
long creatFileSpace(struct dbSysHead *head)
{
struct Segment newSegment;
long segmentAddr;
long alloStaPage;
int i;
if ((head->desc).curFileNum >= MAX_FILE_NUM) {
printf("creatFile Space error:total files cannot be more than %d.\n", (head->desc).curFileNum);
return -1;
}
segmentAddr = (head->desc).segmentAddr + sizeof(struct Segment) * (head->desc).segmentCur;
alloStaPage = allocatePage(head, PAGE_PER_SEGMENT);
if (alloStaPage >= 0) {
for (i = 0; i<MAX_FILE_NUM; i++) {
if ((head->desc).fileDesc[i].fileID <= 0) {
break;
}
}
(head->desc).fileDesc[i].fileID = (head->desc).curfid;
(head->desc).fileDesc[i].fileAddr = segmentAddr;
(head->desc).fileDesc[i].filePageNum = PAGE_PER_SEGMENT;
(head->desc).curFileNum++;
initSegment(&newSegment, alloStaPage, PAGE_PER_SEGMENT, (head->desc).fileDesc[i].fileID, -1, -1);
rewind(head->fpdesc);
fseek(head->fpdesc, (head->desc).fileDesc[i].fileAddr, SEEK_SET);
fwrite(&newSegment, sizeof(struct Segment), 1, head->fpdesc);
(head->desc).segmentNum++;
(head->desc).segmentCur++;
(head->desc).curfid++;
}
else {
printf("creatFileSpace error:creat error");
exit(0);
}
return (head->desc).fileDesc[i].fileID;
}
void initializeRobot()
{
tHTIRS2DSPMode mode = DSP_1200;
HTIRS2setDSPMode(IRSeeker, mode);
servoChangeRate[blockDump] = 5;
servo[blockDump] = BLOCK_SERVO_RETRACTED;
servo[middleElev] = SERVO_STOPPED;
lightStripInit(0x1F);
displayRestingPulse();
/*
* Work around the RobotC bug
*/
initSegment(dead_reckon_from_b3, 0, 0, -12, 100);
initSegment(dead_reckon_from_b3, 1, -90, -24, 100);
initSegment(dead_reckon_from_b3, 2, -90, 32, 100);
initSegment(dead_reckon_from_b3, 2, 0, 0, 0);
initSegment(dead_reckon_from_b2, 0, 0, -23, 100);
initSegment(dead_reckon_from_b2, 1, -90, -24, 100);
initSegment(dead_reckon_from_b2, 2, -90, -32, 100);
initSegment(dead_reckon_from_b2, 2, 0, 0, 0);
initSegment(dead_reckon_from_b1, 0, 0, -45, 100);
initSegment(dead_reckon_from_b1, 1, -90, -24, 100);
initSegment(dead_reckon_from_b1, 2, -90, -32, 100);
initSegment(dead_reckon_from_b1, 2, 0, 0, 0);
initSegment(dead_reckon_from_b0, 0, 0, -55, 100);
initSegment(dead_reckon_from_b0, 1, -90, -24, 100);
initSegment(dead_reckon_from_b0, 2, -90, -32, 100);
initSegment(dead_reckon_from_b0, 2, 0, 0, 0);
}