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标题: VxWorks压缩技术 02 [打印本页]

作者: samwalton 时间: 2014-3-26 15:20 标题: VxWorks压缩技术 02

c. 在 LOCAL STATUS bootLoad 函数之前定义函
数 bootLoadModuleInflate的原型：
#define DECOMP_BUF_SIZE  (RAM_HIGH_ADRS - RAM_LOW_ADRS)
#define COMP_BUF_SIZE  (DECOMP_BUF_SIZE / 3)
STATUS bootLoadModuleInflate(int zfd, FUNCPTR *pEntry)
{
char *imageBuf = NULL;
char *compBuf = NULL;
int  fd = -1;
int  rv = ERROR;
int  compSize, r;
extern STATUS inflate(char *src, char *dst, int src_size);
if ((compBuf = malloc(COMP_BUF_SIZE)) == NULL)
{
  printErr("No enough memory for image buffer
");
  goto done;
}
compSize = 0;
while ((r = read(zfd, compBuf + compSize, COMP_BUF_SIZE - compSize)) > 0)
  compSize += r;
if (r < 0)
{
  printErr("Read failed: errno = %d
", errnoGet());
  goto done;
}
if (compSize == COMP_BUF_SIZE)
{
  printErr("Compressed image too large
");
  goto done;
}
printErr("Uncompressing %d bytes... ", compSize);
if ((imageBuf = malloc(DECOMP_BUF_SIZE)) == NULL)
{
  printErr("Not enough memory for decompression buffer
");
  goto done;
}
if ((r = inflate(compBuf, imageBuf, compSize)) < 0)
{
  printErr("
Uncompress failed
");
  goto done;
}
printErr("
Loading image... ");
memDrv();
memDevCreate("mem:", imageBuf, DECOMP_BUF_SIZE);
if ((fd = open("mem:0", O_RDONLY, 0)) < 0)
{
  printErr("
Cannot open memory device.
");
  goto done;
}
if (bootLoadModule(fd, pEntry) != OK)
{
  printErr("
Error loading: errno = %d
", errnoGet());
  goto done;
}
printErr("
");
rv = OK;
  done:
if (fd >= 0)
  close(fd);
if (imageBuf)
  free(imageBuf);
if (compBuf)
  free(compBuf);
return rv;
}
d. 如果加载不成功，应读懂上一段代码，调整 RAM_HIGH_ADRS 和 RAM_LOW_ADRS的大小。
7  修改 config.h中的启动参数，比如启动设备为tffs=0,0(0,0)，文件名为/tffs0/VxWorks.z等等，重新制作bootrom，并写入flash。

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