本文整理汇总了C++中IOBufferMemoryDescriptor::readBytes方法的典型用法代码示例。如果您正苦于以下问题：C++ IOBufferMemoryDescriptor::readBytes方法的具体用法？C++ IOBufferMemoryDescriptor::readBytes怎么用？C++ IOBufferMemoryDescriptor::readBytes使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类IOBufferMemoryDescriptor的用法示例。
在下文中一共展示了IOBufferMemoryDescriptor::readBytes方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: assert
IOReturn
IOCDBlockStorageDriver::cacheTocInfo(void)
{
IOBufferMemoryDescriptor *buffer;
IOReturn result;
CDTOC *toc;
UInt16 tocSize;
assert(sizeof(CDTOC) == 4); /* (compiler/platform check) */
assert(sizeof(CDTOCDescriptor) == 11); /* (compiler/platform check) */
assert(_toc == NULL);
/* Read the TOC header: */
buffer = IOBufferMemoryDescriptor::withCapacity(sizeof(CDTOC),kIODirectionIn);
if (buffer == NULL) {
return(kIOReturnNoMemory);
}
result = getProvider()->readTOC(buffer);
if (result != kIOReturnSuccess) {
buffer->release();
return(result);
}
toc = (CDTOC *) buffer->getBytesNoCopy();
tocSize = OSSwapBigToHostInt16(toc->length) + sizeof(toc->length);
buffer->release();
/* Reject the TOC if its size is too small: */
if (tocSize <= sizeof(CDTOC)) {
return(kIOReturnNotFound);
}
/* Read the TOC in full: */
buffer = IOBufferMemoryDescriptor::withCapacity(tocSize,kIODirectionIn);
if (buffer == NULL) {
return(kIOReturnNoMemory);
}
result = getProvider()->readTOC(buffer);
if (result != kIOReturnSuccess) {
buffer->release();
return(result);
}
toc = (CDTOC *) IOMalloc(tocSize);
if (toc == NULL) {
buffer->release();
return(kIOReturnNoMemory);
}
if (buffer->readBytes(0,toc,tocSize) != tocSize) {
buffer->release();
IOFree(toc,tocSize);
return(kIOReturnNoMemory);
}
_toc = toc;
_tocSize = tocSize;
buffer->release();
return(result);
}