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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#include "vtkPNMReader.h"
#include "vtkImageData.h"
#include "vtkObjectFactory.h"
#include "vtkStreamingDemandDrivenPipeline.h"
#include <vtksys/SystemTools.hxx>
VTK_ABI_NAMESPACE_BEGIN
vtkStandardNewMacro(vtkPNMReader);
static char vtkPNMReaderGetChar(FILE* fp)
{
char c;
int result;
if ((result = getc(fp)) == EOF)
{
return '\0';
}
c = (char)result;
if (c == '#')
{
do
{
if ((result = getc(fp)) == EOF)
{
return '\0';
}
c = (char)result;
} while (c != '\n');
}
return c;
}
static int vtkPNMReaderGetInt(FILE* fp)
{
char c;
int result = 0;
do
{
c = vtkPNMReaderGetChar(fp);
} while ((c < '1') || (c > '9'));
do
{
result = result * 10 + (c - '0');
c = vtkPNMReaderGetChar(fp);
} while ((c >= '0') && (c <= '9'));
// put the CR/LF or whitespace back.....
ungetc(c, fp);
return result;
}
void vtkPNMReader::ExecuteInformation()
{
int xsize, ysize, comp;
char magic[80];
char c;
FILE* fp;
// if the user has not set the extent, but has set the VOI
// set the zaxis extent to the VOI z axis
if (this->DataExtent[4] == 0 && this->DataExtent[5] == 0 &&
(this->DataVOI[4] || this->DataVOI[5]))
{
this->DataExtent[4] = this->DataVOI[4];
this->DataExtent[5] = this->DataVOI[5];
}
if (!this->FileName && !this->FilePattern)
{
vtkErrorMacro(<< "Either a FileName or FilePattern must be specified.");
return;
}
// Allocate the space for the filename
this->ComputeInternalFileName(this->DataExtent[4]);
// get the magic number by reading in a file
fp = vtksys::SystemTools::Fopen(this->InternalFileName, "rb");
if (!fp)
{
vtkErrorMacro("Unable to open file " << this->InternalFileName);
return;
}
do
{
c = vtkPNMReaderGetChar(fp);
if (c == '\0')
{ // Bad file.
int invalidExtent[6] = { 0, -1, 0, -1, 0, -1 };
vtkStreamingDemandDrivenPipeline::SetWholeExtent(
this->GetOutputInformation(0), invalidExtent);
fclose(fp);
return;
}
} while (c != 'P');
magic[0] = c;
magic[1] = vtkPNMReaderGetChar(fp);
magic[2] = '\0';
// now get the dimensions
xsize = vtkPNMReaderGetInt(fp);
ysize = vtkPNMReaderGetInt(fp);
// read max pixel value into comp for now
vtkPNMReaderGetInt(fp);
// if file is ascii, any amount of whitespace may follow.
// if file is binary, a single whitespace character will follow.
// We only support binary ppm and pgm files right now. So the next
// character IS always ignored.
c = getc(fp);
// if this file was "written" on the PC, then a CR will have been
// written as a CR/LF combination. So, if this single whitespace
// character is a CR and it is followed by a LF, then swallow the
// linefeed character as well. (Not part of the PPM standard, but a
// a hard fact of life.
if (c == 0x0d)
{
c = getc(fp);
if (c != 0x0a)
{
ungetc(c, fp);
}
}
// Set the header size now that we have parsed it
this->SetHeaderSize(ftell(fp));
fclose(fp);
// compare magic number to determine file type
if (!strcmp(magic, "P5"))
{
comp = 1;
}
else if (!strcmp(magic, "P6"))
{
comp = 3;
}
else
{
vtkErrorMacro(<< "Unknown file type! " << this->InternalFileName
<< " is not a binary PGM or PPM!");
return;
}
// if the user has set the VOI, just make sure its valid
if (this->DataVOI[0] || this->DataVOI[1] || this->DataVOI[2] || this->DataVOI[3] ||
this->DataVOI[4] || this->DataVOI[5])
{
if ((this->DataVOI[0] < 0) || (this->DataVOI[1] >= xsize) || (this->DataVOI[2] < 0) ||
(this->DataVOI[3] >= ysize))
{
vtkWarningMacro(
"The requested VOI is larger than the file's (" << this->InternalFileName << ") extent ");
this->DataVOI[0] = 0;
this->DataVOI[1] = xsize - 1;
this->DataVOI[2] = 0;
this->DataVOI[3] = ysize - 1;
}
}
this->DataExtent[0] = 0;
this->DataExtent[1] = xsize - 1;
this->DataExtent[2] = 0;
this->DataExtent[3] = ysize - 1;
this->SetDataScalarTypeToUnsignedChar();
this->SetNumberOfScalarComponents(comp);
this->vtkImageReader::ExecuteInformation();
}
inline int iseol(int c)
{
return c == 10 || c == 13;
}
int vtkPNMReader::CanReadFile(const char* fname)
{
FILE* fp = vtksys::SystemTools::Fopen(fname, "rb");
if (!fp)
{
return 0;
}
unsigned char magic[3];
if (fread(magic, 1, 3, fp) != 3)
{
fclose(fp);
return 0;
}
int ok = ((magic[0] == 'P') && iseol(magic[2]) && (magic[1] >= '1' && magic[1] <= '6'));
fclose(fp);
if (ok)
{
return 3;
}
return 0;
}
//------------------------------------------------------------------------------
void vtkPNMReader::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
}
VTK_ABI_NAMESPACE_END
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