IFAKA 0ea1ef29a4 fix: add bounds checks to Epub getter functions
- getCumulativeSpineItemSize(): Add bounds check before .at()
- getSpineItem(): Handle empty spine case to prevent exception
- getTocItem(): Handle empty toc case to prevent exception

Uses static fallback objects for reference returns when containers
are empty, preventing exceptions from .at(0) on empty vectors.
2025-12-20 19:26:51 +01:00
..
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PlatformIO will compile them to static libraries and link into the executable file.

The source code of each library should be placed in a separate directory
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For example, see the structure of the following example libraries `Foo` and `Bar`:

|--lib
|  |
|  |--Bar
|  |  |--docs
|  |  |--examples
|  |  |--src
|  |     |- Bar.c
|  |     |- Bar.h
|  |  |- library.json (optional. for custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
|  |
|  |--Foo
|  |  |- Foo.c
|  |  |- Foo.h
|  |
|  |- README --> THIS FILE
|
|- platformio.ini
|--src
   |- main.c

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```
#include <Foo.h>
#include <Bar.h>

int main (void)
{
  ...
}

```

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