- PSDDecoder: Add dimension limits (max 30,000) to prevent integer
overflows during LinearImage allocation.
- Add checks for stream failure during pixel decoding to handle truncated
files safely.
- Follow existing pattern in this file by using std::runtime_error for
these checks, which are caught and handled by resetting the stream and
returning an empty image.
- Add comment that LinearImage allocation cannot overflow with the new
limits.
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