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Fix file viewer glitch with empty output

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The file viewer was seeing zero-length formatted output and assuming
that it was the result of zero-length input.  This is a problem
because the code disables the format options when there's nothing to
format.  This resulted in the strange behavior noted in issue #14.

Now the "is source empty" value is passed explicitly, and we display
a different message when the formatter fails.
This commit is contained in:
Andy McFadden 2017-09-22 11:25:08 -07:00
parent 9f0640142d
commit 549342b3d9
2 changed files with 37 additions and 9 deletions
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34
app/ViewFilesDialog.cpp
View File

@ -266,7 +266,22 @@ static void DumpBitmapInfo(HBITMAP hBitmap)
LOGD(" bmPits = 0x%p", info.bmBits);
}
void ViewFilesDialog::DisplayText(const WCHAR* fileName)
bool ViewFilesDialog::IsSourceEmpty(const GenericEntry* pEntry,
ReformatHolder::ReformatPart part)
{
switch (part) {
case ReformatHolder::ReformatPart::kPartData:
return pEntry->GetDataForkLen() == 0;
case ReformatHolder::ReformatPart::kPartRsrc:
return pEntry->GetRsrcForkLen() == 0;
case ReformatHolder::ReformatPart::kPartCmmt:
return !pEntry->GetHasNonEmptyComment();
default:
return false;
}
}
void ViewFilesDialog::DisplayText(const WCHAR* fileName, bool zeroSourceLen)
{
CWaitCursor wait; // streaming of big files can take a little while
bool errFlg;
@ -404,10 +419,14 @@ void ViewFilesDialog::DisplayText(const WCHAR* fileName)
if (fpOutput->GetOutputKind() == ReformatOutput::kOutputRTF)
streamFormat = SF_RTF;
if (fpOutput->GetTextLen() == 0) {
textBuf = "(file is empty)";
if (zeroSourceLen) {
textBuf = "(file is empty)";
EnableFormatSelection(FALSE);
} else {
textBuf = "(converted output is empty)";
}
textLen = strlen(textBuf);
emptyFlg = true;
EnableFormatSelection(FALSE);
}
if (fpOutput->GetOutputKind() == ReformatOutput::kOutputErrorMsg)
EnableFormatSelection(FALSE);
@ -638,7 +657,8 @@ void ViewFilesDialog::OnFviewNext(void)
id = ConfigureFormatSel(part);
Reformat(pSelEntry->GetEntry(), part, id);
DisplayText(pSelEntry->GetEntry()->GetDisplayName());
DisplayText(pSelEntry->GetEntry()->GetDisplayName(),
IsSourceEmpty(pSelEntry->GetEntry(), part));
}
void ViewFilesDialog::OnFviewPrev(void)
@ -681,7 +701,7 @@ void ViewFilesDialog::OnFviewPrev(void)
id = ConfigureFormatSel(part);
Reformat(pEntry, part, id);
DisplayText(pEntry->GetDisplayName());
DisplayText(pEntry->GetDisplayName(), IsSourceEmpty(pEntry, part));
}
void ViewFilesDialog::ConfigurePartButtons(const GenericEntry* pEntry)
@ -936,7 +956,7 @@ void ViewFilesDialog::OnFormatSelChange(void)
id = (ReformatHolder::ReformatID) pCombo->GetItemData(pCombo->GetCurSel());
Reformat(pEntry, part, id);
DisplayText(pEntry->GetDisplayName());
DisplayText(pEntry->GetDisplayName(), IsSourceEmpty(pEntry, part));
}
void ViewFilesDialog::OnFviewData(void)
@ -969,7 +989,7 @@ void ViewFilesDialog::ForkSelectCommon(ReformatHolder::ReformatPart part)
id = ConfigureFormatSel(part);
Reformat(pEntry, part, id);
DisplayText(pEntry->GetDisplayName());
DisplayText(pEntry->GetDisplayName(), IsSourceEmpty(pEntry, part));
}
void ViewFilesDialog::OnFviewFmtBest(void)

12
app/ViewFilesDialog.h
View File

@ -120,15 +120,23 @@ private:
//void StretchControl(int id, int deltaX, int deltaY);
void NewFontSelected(bool resetBold);
/*
* Determines whether the specified part is an empty fork/comment.
*/
bool IsSourceEmpty(const GenericEntry* pEntry,
ReformatHolder::ReformatPart part);
/*
* Display a buffer of text in the RichEdit control.
*
* The RichEdit dialog will hold its own copy of the data, so "pHolder" can
* be safely destroyed after this returns.
*
* "fileName" is for display only.
* "fileName" is for display only. "zeroSourceLen" allows the function to
* tell the difference between an empty file and a non-empty file that
* generated empty output.
*/
void DisplayText(const WCHAR* fileName);
void DisplayText(const WCHAR* fileName, bool zeroSourceLen);
/*
* Set up the fpHolder. Does not reformat the data, just loads the source