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qed: Add support for zero clusters
Zero clusters are similar to unallocated clusters except instead of readingtheir value from a backing file when one is available, the cluster is alwaysread as zero.
This implements read support only. At this stage, QED will never write a...
qed: Table, L2 cache, and cluster functions
This patch adds code to look up data cluster offsets in the image viathe L1/L2 tables. The L2 tables are writethrough cached in memory forperformance (each read/write requires a lookup so it is essential tocache the tables)....