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Deal with stale caches

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This commit is contained in:
jpirnay
2026-03-04 10:46:56 +01:00
parent 1516c51e14
commit 08cdd06c41
2 changed files with 89 additions and 81 deletions
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src/activities/reader/TxtReaderActivity.cpp
+78 -76
View File
@@ -405,12 +405,17 @@ void TxtReaderActivity::renderStatusBar() const {
void TxtReaderActivity::saveProgress() const {
FsFile f;
if (Storage.openFileForWrite("TRS", txt->getCachePath() + "/progress.bin", f)) {
uint8_t data[4];
// 6-byte format: page(2 bytes LE) + file offset(4 bytes LE)
// The offset lets drawCurrentPageToBuffer render without requiring index.bin.
const size_t offset = (currentPage < static_cast<int>(pageOffsets.size())) ? pageOffsets[currentPage] : 0;
uint8_t data[6];
data[0] = currentPage & 0xFF;
data[1] = (currentPage >> 8) & 0xFF;
data[2] = 0;
data[3] = 0;
f.write(data, 4);
data[2] = offset & 0xFF;
data[3] = (offset >> 8) & 0xFF;
data[4] = (offset >> 16) & 0xFF;
data[5] = (offset >> 24) & 0xFF;
f.write(data, 6);
f.close();
}
}
@@ -611,82 +616,79 @@ bool TxtReaderActivity::drawCurrentPageToBuffer(const std::string& filePath, Gfx
const int lineHeight = renderer.getLineHeight(fontId);
const int linesPerPage = std::max(1, vh / lineHeight);
// Load the page offset index from cache (must already exist from normal reading)
std::string cachePath = txt.getCachePath() + "/index.bin";
FsFile cacheFile;
if (!Storage.openFileForRead("SLP", cachePath, cacheFile)) {
LOG_DBG("SLP", "TXT: no page index cache");
return false;
}
uint32_t magic;
serialization::readPod(cacheFile, magic);
if (magic != CACHE_MAGIC) {
cacheFile.close();
return false;
}
uint8_t version;
serialization::readPod(cacheFile, version);
if (version != CACHE_VERSION) {
cacheFile.close();
return false;
}
uint32_t cachedFileSize;
serialization::readPod(cacheFile, cachedFileSize);
if (cachedFileSize != txt.getFileSize()) {
cacheFile.close();
return false;
}
int32_t cachedVw, cachedLpp, cachedFontId, cachedMargin;
serialization::readPod(cacheFile, cachedVw);
serialization::readPod(cacheFile, cachedLpp);
serialization::readPod(cacheFile, cachedFontId);
serialization::readPod(cacheFile, cachedMargin);
if (cachedVw != vw || cachedLpp != linesPerPage || cachedFontId != fontId || cachedMargin != screenMargin) {
LOG_DBG("SLP", "TXT: cache invalid (settings changed)");
cacheFile.close();
return false;
}
uint8_t cachedAlignment;
serialization::readPod(cacheFile, cachedAlignment);
if (cachedAlignment != paragraphAlignment) {
cacheFile.close();
return false;
}
uint32_t numPages;
serialization::readPod(cacheFile, numPages);
if (numPages == 0 || numPages > MAX_CACHE_PAGES) {
cacheFile.close();
return false;
}
// Load saved page number before reading offsets
// Step 1: Try to read the saved page and its file offset from progress.bin.
// The 6-byte format (written by saveProgress) stores: page(2) + offset(4).
// This lets us skip index.bin entirely, so the overlay works even when the
// page index cache is missing or stale (e.g. after a firmware update).
int savedPage = 0;
FsFile progFile;
if (Storage.openFileForRead("SLP", txt.getCachePath() + "/progress.bin", progFile)) {
uint8_t data[4];
if (progFile.read(data, 4) == 4) {
savedPage = (int)((uint32_t)data[0] | ((uint32_t)data[1] << 8));
}
progFile.close();
}
if (savedPage < 0 || savedPage >= static_cast<int>(numPages)) savedPage = 0;
// Read offsets sequentially, retaining only the one we need
size_t savedOffset = 0;
for (uint32_t i = 0; i < numPages; i++) {
uint32_t off;
serialization::readPod(cacheFile, off);
if (static_cast<int>(i) == savedPage) {
savedOffset = off;
bool offsetKnown = false;
{
FsFile progFile;
if (Storage.openFileForRead("SLP", txt.getCachePath() + "/progress.bin", progFile)) {
uint8_t data[6] = {0};
const int n = progFile.read(data, 6);
progFile.close();
if (n >= 2) {
savedPage = (int)((uint32_t)data[0] | ((uint32_t)data[1] << 8));
}
if (n >= 6) {
const uint32_t off =
(uint32_t)data[2] | ((uint32_t)data[3] << 8) | ((uint32_t)data[4] << 16) | ((uint32_t)data[5] << 24);
if (off < txt.getFileSize()) {
savedOffset = off;
offsetKnown = true;
}
}
}
}
// Step 2: If progress.bin didn't provide the offset, fall back to index.bin.
if (!offsetKnown) {
std::string cachePath = txt.getCachePath() + "/index.bin";
FsFile cacheFile;
if (Storage.openFileForRead("SLP", cachePath, cacheFile)) {
uint32_t magic;
serialization::readPod(cacheFile, magic);
uint8_t version;
serialization::readPod(cacheFile, version);
uint32_t cachedFileSize;
serialization::readPod(cacheFile, cachedFileSize);
int32_t cachedVw, cachedLpp, cachedFontId, cachedMargin;
serialization::readPod(cacheFile, cachedVw);
serialization::readPod(cacheFile, cachedLpp);
serialization::readPod(cacheFile, cachedFontId);
serialization::readPod(cacheFile, cachedMargin);
uint8_t cachedAlignment;
serialization::readPod(cacheFile, cachedAlignment);
uint32_t numPages;
serialization::readPod(cacheFile, numPages);
if (magic == CACHE_MAGIC && version == CACHE_VERSION && cachedFileSize == txt.getFileSize() && cachedVw == vw &&
cachedLpp == linesPerPage && cachedFontId == fontId && cachedMargin == screenMargin &&
cachedAlignment == paragraphAlignment && numPages > 0 && numPages <= MAX_CACHE_PAGES) {
if (savedPage < 0 || savedPage >= static_cast<int>(numPages)) savedPage = 0;
for (uint32_t i = 0; i < numPages; i++) {
uint32_t off;
serialization::readPod(cacheFile, off);
if (static_cast<int>(i) == savedPage) {
savedOffset = off;
offsetKnown = true;
}
}
} else {
LOG_DBG("SLP", "TXT: index cache invalid or stale");
}
cacheFile.close();
}
// Step 3: No valid cache at all — render from the start of the file as a last resort.
// This shows page 1 rather than a blank screen, which is always preferable.
if (!offsetKnown) {
LOG_DBG("SLP", "TXT: no valid cache, falling back to start of file");
savedOffset = 0;
}
}
cacheFile.close();
// Load the page lines from file
std::vector<std::string> pageLines;