// Function taken from Haiku ShowImage,
// function originally written by Michael Pfeiffer
bool
SlideShowSaver::FindNextImage(entry_ref *in_current, entry_ref *out_image, bool next, bool rewind)
{
// ASSERT(next || !rewind);
BEntry curImage(in_current);
entry_ref entry, *ref;
BDirectory parent;
BList entries;
bool found = false;
int32 cur;
if (curImage.GetParent(&parent) != B_OK)
return false;
while (parent.GetNextRef(&entry) == B_OK) {
if (entry != *in_current) {
entries.AddItem(new entry_ref(entry));
} else {
// insert current ref, so we can find it easily after sorting
entries.AddItem(in_current);
}
}
entries.SortItems(CompareEntries);
cur = entries.IndexOf(in_current);
// ASSERT(cur >= 0);
// remove it so FreeEntries() does not delete it
entries.RemoveItem(in_current);
if (next) {
// find the next image in the list
if (rewind) cur = 0; // start with first
for (; (ref = (entry_ref*)entries.ItemAt(cur)) != NULL; cur ++) {
if (IsImage(ref)) {
found = true;
*out_image = (const entry_ref)*ref;
break;
}
}
} else {
// find the previous image in the list
cur --;
for (; cur >= 0; cur --) {
ref = (entry_ref*)entries.ItemAt(cur);
if (IsImage(ref)) {
found = true;
*out_image = (const entry_ref)*ref;
break;
}
}
}
FreeEntries(&entries);
return found;
}
/**
* @return true if the log was loaded successfully.
*/
BOOL CTextLogFile::LoadEntries(void)
{
#ifdef _DEBUG
DWORD dwStartTime = GetTickCount();
#endif
BOOL bResult = FALSE;
PCTSTR pszLogFileName = GetLogFileName();
HANDLE hFile = CreateFile(pszLogFileName, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (hFile != INVALID_HANDLE_VALUE)
{
DWORD dwFileSize = (DWORD)GetFileSize(hFile, NULL);
if (dwFileSize == 0)
{
// ignore empty files
CloseHandle(hFile);
return TRUE;
}
DWORD dwBufferSize = min(dwFileSize, g_dwMaxBufferSize);
PBYTE pFileBuffer = new BYTE[dwBufferSize];
if (pFileBuffer)
{
BYTE arrUTF8Preamble[sizeof(g_arrUTF8Preamble)];
DWORD dwWritten = 0;
if (ReadFile(hFile, arrUTF8Preamble, sizeof(arrUTF8Preamble), &dwWritten, NULL) &&
dwWritten == sizeof(arrUTF8Preamble) && memcmp(arrUTF8Preamble, g_arrUTF8Preamble, sizeof(arrUTF8Preamble)) == 0)
{
bResult = TRUE;
DWORD dwCurrentPos = 0, dwLineStart = 0;
for (;;)
{
dwWritten = 0;
DWORD dwFreeSize = dwBufferSize - dwCurrentPos;
if (! ReadFile(hFile, pFileBuffer + dwCurrentPos, dwFreeSize, &dwWritten, NULL))
goto end;
BOOL bEndOfFile = dwWritten < dwFreeSize;
dwWritten += dwCurrentPos;
dwCurrentPos = 0;
if (dwWritten == 0)
goto end;
for (;;)
{
if (dwCurrentPos >= dwWritten && ! bEndOfFile)
{
if (dwLineStart > 0)
{
dwCurrentPos -= dwLineStart;
MoveMemory(pFileBuffer, pFileBuffer + dwLineStart, dwCurrentPos);
dwLineStart = 0;
}
else
{
dwBufferSize *= 2;
PBYTE pNewFileBuffer = new BYTE[dwBufferSize];
if (! pNewFileBuffer)
{
bResult = FALSE;
goto end;
}
CopyMemory(pNewFileBuffer, pFileBuffer, dwCurrentPos);
delete[] pFileBuffer;
pFileBuffer = pNewFileBuffer;
}
break;
}
if (dwCurrentPos < dwWritten ? pFileBuffer[dwCurrentPos] == '\r' || pFileBuffer[dwCurrentPos] == '\n' : bEndOfFile)
{
if (dwLineStart < dwCurrentPos && ! AddToTail(pFileBuffer + dwLineStart, dwCurrentPos - dwLineStart, true))
{
bResult = FALSE;
goto end;
}
if (dwCurrentPos == dwWritten) // bEndOfFile == TRUE, see condition above
{
bResult = TRUE;
goto end;
}
dwLineStart = dwCurrentPos + 1;
}
++dwCurrentPos;
}
}
}
end:
if (! bResult)
FreeEntries();
delete[] pFileBuffer;
}
CloseHandle(hFile);
}
else
{
DWORD dwLastError = GetLastError();
if (dwLastError == ERROR_FILE_NOT_FOUND ||
dwLastError == ERROR_PATH_NOT_FOUND ||
GetFileAttributes(pszLogFileName) == INVALID_FILE_ATTRIBUTES)
{
bResult = TRUE; // ignore missing files
}
}
#ifdef _DEBUG
DWORD dwEndTime = GetTickCount();
TCHAR szMessage[128];
_stprintf_s(szMessage, countof(szMessage), _T("CTextLogFile::LoadEntries(): %lu entries, %lu bytes, %lu milliseconds\r\n"), GetNumEntries(), GetNumBytes(), dwEndTime - dwStartTime);
OutputDebugString(szMessage);
#endif
return bResult;
}