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fix: add bounds checks to Epub getter functions

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- 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.
This commit is contained in:
IFAKA 2025-12-20 19:20:54 +01:00
parent cfe838e03b
commit 0ea1ef29a4
1 changed files with 19 additions and 3 deletions
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22
lib/Epub/Epub.cpp
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@ -298,10 +298,21 @@ bool Epub::getItemSize(const std::string& itemHref, size_t* size) const {
int Epub::getSpineItemsCount() const { return spine.size(); }
size_t Epub::getCumulativeSpineItemSize(const int spineIndex) const { return cumulativeSpineItemSize.at(spineIndex); }
size_t Epub::getCumulativeSpineItemSize(const int spineIndex) const {
if (spineIndex < 0 || spineIndex >= static_cast<int>(cumulativeSpineItemSize.size())) {
Serial.printf("[%lu] [EBP] getCumulativeSpineItemSize index:%d is out of range\n", millis(), spineIndex);
return 0;
}
return cumulativeSpineItemSize.at(spineIndex);
}
std::string& Epub::getSpineItem(const int spineIndex) {
if (spineIndex < 0 || spineIndex >= spine.size()) {
static std::string emptyString;
if (spine.empty()) {
Serial.printf("[%lu] [EBP] getSpineItem called but spine is empty\n", millis());
return emptyString;
}
if (spineIndex < 0 || spineIndex >= static_cast<int>(spine.size())) {
Serial.printf("[%lu] [EBP] getSpineItem index:%d is out of range\n", millis(), spineIndex);
return spine.at(0).second;
}
@ -310,7 +321,12 @@ std::string& Epub::getSpineItem(const int spineIndex) {
}
EpubTocEntry& Epub::getTocItem(const int tocTndex) {
if (tocTndex < 0 || tocTndex >= toc.size()) {
static EpubTocEntry emptyEntry("", "", "", 0);
if (toc.empty()) {
Serial.printf("[%lu] [EBP] getTocItem called but toc is empty\n", millis());
return emptyEntry;
}
if (tocTndex < 0 || tocTndex >= static_cast<int>(toc.size())) {
Serial.printf("[%lu] [EBP] getTocItem index:%d is out of range\n", millis(), tocTndex);
return toc.at(0);
}