Add support for IPS patching via GPO cluster interweaving#205
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Add support for loading and interweaving IPS patches via GPO files on boot.
- Transparently routes reads to patched clusters on the SD card without runtime emulation overhead.
- Integrates data cache flushing and memory alignment to ensure a reliable boot process (fixing black screen crashes).
- Optimizes initialization to skip all SD card write operations and exit immediately when no IPS patch is present.
Adds extension cluster support (hunks past original ROM EOF), IPS truncate field handling, and patchedRomSize tracking through verifyGpo, createGpo, mergeClusterMaps, gpo_init, and gpo_patchLinearChunk. Also fixes SNESTool EOF ambiguity, RLE count==0 hang, unchecked I/O, file handle leaks, and adds a GPOT power-loss guard.
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Loads and applies IPS patches at boot by generating a
.gposidecar file that stores pre-patched clusters. The FatFS cluster link-map is replaced with a merged table that transparently redirects patched cluster reads to the GPO file, with zero runtime overhead in the SD cache hot path.This build adds:
gFile.obj.objsizeupdated)0x454F46only treated as EOF when<= 3bytes remain)GPOTplaceholder and promoted toGPO1only on successful completionTested:
Still experimental. Closes #16.