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added IO errors handling to TGA reading code

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@45161 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin 2007-03-30 16:33:12 +00:00
parent 853c39d78b
commit 8fee630648
1 changed files with 30 additions and 10 deletions
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40
src/common/imagtga.cpp
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@ -39,9 +39,10 @@
// TGA error codes.
enum
{
wxTGA_OK = 0,
wxTGA_INVFORMAT = 1,
wxTGA_MEMERR = 2
wxTGA_OK,
wxTGA_INVFORMAT,
wxTGA_MEMERR,
wxTGA_IOERR
};
// TGA header bytes.
@ -100,8 +101,9 @@ void FlipTGA(unsigned char* imageData, int width, int height, short pixelSize)
}
}
// return wxTGA_OK or wxTGA_IOERR
static
void DecodeRLE(unsigned char* imageData, unsigned long imageSize,
int DecodeRLE(unsigned char* imageData, unsigned long imageSize,
short pixelSize, wxInputStream& stream)
{
unsigned long index = 0;
@ -111,7 +113,11 @@ void DecodeRLE(unsigned char* imageData, unsigned long imageSize,
while (index < imageSize)
{
current = stream.GetC();
int ch = stream.GetC();
if ( ch == wxEOF )
return wxTGA_IOERR;
current = ch;
// RLE packet.
if ( current & 0x80 )
@ -126,7 +132,8 @@ void DecodeRLE(unsigned char* imageData, unsigned long imageSize,
index += current * pixelSize;
// Repeat the pixel length times.
stream.Read(buf, pixelSize);
if ( !stream.Read(buf, pixelSize) )
return wxTGA_IOERR;
for (unsigned int i = 0; i < length; i++)
{
@ -145,11 +152,14 @@ void DecodeRLE(unsigned char* imageData, unsigned long imageSize,
index += length;
// Write the next length pixels directly to the image data.
stream.Read(imageData, length);
if ( !stream.Read(imageData, length) )
return wxTGA_IOERR;
imageData += length;
}
}
return wxTGA_OK;
}
static
@ -442,7 +452,9 @@ int ReadTGA(wxImage* image, wxInputStream& stream)
// Decode the RLE data.
DecodeRLE(imageData, imageSize, pixelSize, stream);
int rc = DecodeRLE(imageData, imageSize, pixelSize, stream);
if ( rc != wxTGA_OK )
return rc;
// If orientation == 0, then the image is stored upside down.
// We need to store it right side up.
@ -500,7 +512,9 @@ int ReadTGA(wxImage* image, wxInputStream& stream)
{
// Decode the RLE data.
DecodeRLE(imageData, imageSize, pixelSize, stream);
int rc = DecodeRLE(imageData, imageSize, pixelSize, stream);
if ( rc != wxTGA_OK )
return rc;
// If orientation == 0, then the image is stored upside down.
// We need to store it right side up.
@ -578,7 +592,9 @@ int ReadTGA(wxImage* image, wxInputStream& stream)
{
// Decode the RLE data.
DecodeRLE(imageData, imageSize, pixelSize, stream);
int rc = DecodeRLE(imageData, imageSize, pixelSize, stream);
if ( rc != wxTGA_OK )
return rc;
// If orientation == 0, then the image is stored upside down.
// We need to store it right side up.
@ -674,6 +690,10 @@ bool wxTGAHandler::LoadFile(wxImage* image,
wxLogError(wxT("TGA: couldn't allocate memory."));
break;
case wxTGA_IOERR:
wxLogError(wxT("TGA: couldn't read image data."));
break;
default:
wxLogError(wxT("TGA: unknown error!"));
}