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Add dyld shared cache parsing #305

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Add dyld shared cache parsing #305

wants to merge 2 commits into from

Commits on May 18, 2021

  1. Add MachOFile::parse_at_offset. 

    This allows parsing Mach-O images inside dyld shared cache files (gimli-rs#268):
The dyld shared cache contains multiple images at different offsets; all these
images share the same address space for absolute offsets such as symoff. Due to
these absolute offsets, one cannot just parse the images by subsetting the input
slice and parsing at header offset zero.

This patch is a breaking change because it adds a header_offset argument to the
MachHeader methods load_commands and uuid, and MachHeader is part of the public API.
    @mstange
    mstange committed May 18, 2021
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  2. Add DyldCache. 

    This implements just enough to get the path and header offset of each contained image.
It also adds a function to get an "any" File object for the image, so that the caller
doesn't need to write code twice for 32 and 64 bit images and can instead benefit from
the enum-based dynamic dispatch.
This commit also adds two "examples", for printing the list of images in the cache and
for dumping an object from inside the cache.
    @mstange
    mstange committed May 18, 2021
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