[2/2] imagehlp: Implement ImageGetDigestStream

[Andrey Turkin]

Mostly based on patch from Juan Lang with some enhancements:
- use mapping instead of reading file chunks from handle
- correctly work with dos part of any length
---
  dlls/imagehlp/integrity.c   |  250 ++++++++++++++++++++++++++++++++++++++++++-
  dlls/imagehlp/tests/image.c |   19 ++--
  2 files changed, 253 insertions(+), 16 deletions(-)


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