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There are typically only a few dozen mappings, while there can be
millions of pages. This reduces the amount of time spent populating the
mapping from region to file accessor along with the memory usage of the
same.
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`MMappedFileAccessor::ReadBuffer` was returning a heap-allocated
`DataBuffer`, but no callers were ever deleting it. There does not
appear to be any reason to heap allocate the `DataBuffer` as the type is
effectively a smart pointer wrapper around `BNDataBuffer`. Switch to
returning it by value instead.
Additionally, `MMappedFileAccessor::ReadBuffer` was allocating a buffer,
copying data into it, and then handing that allocation to the `DataBuffer`
constructor. The constructor copies data into a new allocation it
owns so this allocation is unnecessary and was being leaked.
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This is an early release of our DSC processing plugin. We're still hard at work improving this feature. You should be able to just drop in a dyld_shared_cache and use the 'Shared Cache Triage' view to load and analyze images.
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