IFAKA 3e28724b62 Add bounds checking for TOC/spine array access (#64) ...

## Problem
`getSpineIndexForTocIndex()` and `getTocIndexForSpineIndex()` access
`toc[tocIndex]` and `spine[spineIndex]` without validating indices are
within bounds. Malformed EPUBs or edge cases could trigger out-of-bounds
access.

## Fix
Added bounds validation at the start of both functions before accessing
the arrays.

## Testing
- Builds successfully with `pio run`
- Affects: `lib/Epub/Epub.cpp`

2025-12-19 23:23:23 +11:00

11 KiB

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