/////////////////////////////////////////////////////////////////////////////
-// Name: imagiff.h
+// Name: src/common/imagiff.h
// Purpose: wxImage handler for Amiga IFF images
// Author: Steffen Gutmann, Thomas Meyer
// RCS-ID: $Id$
// Parts of this source are based on the iff loading algorithm found
// in xviff.c. Permission by the original author, Thomas Meyer, and
// by the author of xv, John Bradley for using the iff loading part
-// in wxWindows has been gratefully given.
-
-#ifdef __GNUG__
-#pragma implementation "imagiff.h"
-#endif
+// in wxWidgets has been gratefully given.
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#ifdef __BORLANDC__
-# pragma hdrstop
+ #pragma hdrstop
#endif
+#if wxUSE_IMAGE && wxUSE_IFF
+
#ifndef WX_PRECOMP
-# include "wx/defs.h"
+ #include "wx/log.h"
+ #include "wx/intl.h"
#endif
-#if wxUSE_IMAGE && wxUSE_IFF
-
#include "wx/imagiff.h"
#include "wx/wfstream.h"
-#include "wx/log.h"
-#include "wx/intl.h"
+
+#if wxUSE_PALETTE
+ #include "wx/palette.h"
+#endif // wxUSE_PALETTE
#include <stdlib.h>
#include <string.h>
unsigned int w; /* width */
unsigned int h; /* height */
int transparent; /* transparent color (-1 = none) */
- int colors; /* number of colors */
+ int colors; /* number of colors */
unsigned char *p; /* bitmap */
unsigned char *pal; /* palette */
class WXDLLEXPORT wxIFFDecoder
{
private:
- IFFImage *m_image; // image data
- wxInputStream *m_f; // input stream
+ IFFImage *m_image; // image data
+ wxInputStream *m_f; // input stream
unsigned char *databuf;
unsigned char *picptr;
unsigned char *decomp_mem;
// constructor, destructor, etc.
wxIFFDecoder(wxInputStream *s);
~wxIFFDecoder() { Destroy(); }
+
+ // NOTE: this function modifies the current stream position
bool CanRead();
+
int ReadIFF();
bool ConvertToImage(wxImage *image) const;
};
image->Create(GetWidth(), GetHeight());
if (!image->Ok())
- return FALSE;
+ return false;
unsigned char *pal = GetPalette();
unsigned char *src = GetData();
image->SetMaskColour(255, 0, 255);
}
else
- image->SetMask(FALSE);
+ image->SetMask(false);
#if wxUSE_PALETTE
if (pal && colors > 0)
dst[2] = src[2];
}
- return TRUE;
+ return true;
}
//
// CanRead:
-// Returns TRUE if the file looks like a valid IFF, FALSE otherwise.
+// Returns true if the file looks like a valid IFF, false otherwise.
//
bool wxIFFDecoder::CanRead()
{
- unsigned char buf[12] = "";
+ unsigned char buf[12];
- m_f->Read(buf, 12);
- m_f->SeekI(-12, wxFromCurrent);
+ if ( !m_f->Read(buf, WXSIZEOF(buf)) )
+ return false;
- return (memcmp(buf, "FORM", 4) == 0 && memcmp(buf+8, "ILBM", 4) == 0);
+ return (memcmp(buf, "FORM", 4) == 0) && (memcmp(buf+8, "ILBM", 4) == 0);
}
// ReadIFF:
// Based on xv source code by Thomas Meyer
-// Permission for use in wxWindows has been gratefully given.
+// Permission for use in wxWidgets has been gratefully given.
typedef unsigned char byte;
#define IFFDEBUG 0
/*************************************************************************
- void decomprle(source, destination, source length, buffer size)
+void decomprle(source, destination, source length, buffer size)
- Decompress run-length encoded data from source to destination. Terminates
- when source is decoded completely or destination buffer is full.
+Decompress run-length encoded data from source to destination. Terminates
+when source is decoded completely or destination buffer is full.
- The decruncher is as optimized as I could make it, without risking
- safety in case of corrupt BODY chunks.
+The decruncher is as optimized as I could make it, without risking
+safety in case of corrupt BODY chunks.
**************************************************************************/
static void decomprle(const byte *sptr, byte *dptr, long slen, long dlen)
m_image = new IFFImage();
if (m_image == 0) {
- Destroy();
- return wxIFF_MEMERR;
+ Destroy();
+ return wxIFF_MEMERR;
}
// compute file length
- off_t currentPos = m_f->TellI();
- m_f->SeekI(0, wxFromEnd);
+ wxFileOffset currentPos = m_f->TellI();
+ if (m_f->SeekI(0, wxFromEnd) == wxInvalidOffset) {
+ Destroy();
+ return wxIFF_MEMERR;
+ }
+
long filesize = m_f->TellI();
- m_f->SeekI(currentPos, wxFromStart);
+ if (m_f->SeekI(currentPos, wxFromStart) == wxInvalidOffset) {
+ Destroy();
+ return wxIFF_MEMERR;
+ }
// allocate memory for complete file
if ((databuf = new byte[filesize]) == 0) {
- Destroy();
- return wxIFF_MEMERR;
+ Destroy();
+ return wxIFF_MEMERR;
}
m_f->Read(databuf, filesize);
// check for minmal size
if (dataptr + 12 > dataend) {
- Destroy();
- return wxIFF_INVFORMAT;
+ Destroy();
+ return wxIFF_INVFORMAT;
}
// check if we really got an IFF file
if (strncmp((char *)dataptr, "FORM", 4) != 0) {
- Destroy();
- return wxIFF_INVFORMAT;
+ Destroy();
+ return wxIFF_INVFORMAT;
}
dataptr = dataptr + 8; // skip ID and length of FORM
// check if the IFF file is an ILBM (picture) file
if (strncmp((char *) dataptr, "ILBM", 4) != 0) {
- Destroy();
- return wxIFF_INVFORMAT;
+ Destroy();
+ return wxIFF_INVFORMAT;
}
wxLogTrace(_T("iff"), _T("IFF ILBM file recognized"));
// main decoding loop. searches IFF chunks and handles them.
// terminates when BODY chunk was found or dataptr ran over end of file
//
- bool BMHDok = FALSE, CMAPok = FALSE, CAMGok = FALSE;
+ bool BMHDok = false, CAMGok = false;
int bmhd_width = 0, bmhd_height = 0, bmhd_bitplanes = 0, bmhd_transcol = -1;
- byte bmhd_masking = 0, bmhd_compression = 0;
+ byte bmhd_compression = 0;
long camg_viewmode = 0;
int colors = 0;
while (dataptr + 8 <= dataend) {
// get chunk length and make even
- size_t chunkLen = (iff_getlong(dataptr + 4) + 1) & 0xfffffffe;
-#ifdef __VMS
- // Silence compiler warning
- int chunkLen_;
- chunkLen_ = chunkLen;
- if (chunkLen_ < 0) { // format error?
-#else
- if (chunkLen < 0) { // format error?
-#endif
- break;
+ long chunkLen = (iff_getlong(dataptr + 4) + 1) & 0xfffffffe;
+ if (chunkLen < 0) { // format error?
+ break;
}
bool truncated = (dataptr + 8 + chunkLen > dataend);
bmhd_width = iff_getword(dataptr + 8); // width of picture
bmhd_height= iff_getword(dataptr + 8 + 2); // height of picture
bmhd_bitplanes = *(dataptr + 8 + 8); // # of bitplanes
- bmhd_masking = *(dataptr + 8 + 9);
+ // bmhd_masking = *(dataptr + 8 + 9); -- unused currently
bmhd_compression = *(dataptr + 8 + 10); // get compression
bmhd_transcol = iff_getword(dataptr + 8 + 12);
- BMHDok = TRUE; // got BMHD
+ BMHDok = true; // got BMHD
dataptr += 8 + chunkLen; // to next chunk
}
else if (strncmp((char *)dataptr, "CMAP", 4) == 0) { // CMAP ?
wxLogTrace(_T("iff"), _T("Read %d colors from IFF file."),
colors);
- CMAPok = TRUE; // got CMAP
dataptr += 8 + chunkLen; // to next chunk
} else if (strncmp((char *)dataptr, "CAMG", 4) == 0) { // CAMG ?
if (chunkLen < 4 || truncated) {
break;
}
camg_viewmode = iff_getlong(dataptr + 8); // get viewmodes
- CAMGok = TRUE; // got CAMG
+ CAMGok = true; // got CAMG
dataptr += 8 + chunkLen; // to next chunk
}
else if (strncmp((char *)dataptr, "BODY", 4) == 0) { // BODY ?
int c = (col & 0x0f);
switch (col & 0x30) {
case 0x00: if (c >= 0 && c < colors) {
- rval = pal[3*c + 0];
- gval = pal[3*c + 1];
- bval = pal[3*c + 2];
- }
- break;
+ rval = pal[3*c + 0];
+ gval = pal[3*c + 1];
+ bval = pal[3*c + 2];
+ }
+ break;
case 0x10: bval = c * 17;
- break;
+ break;
case 0x20: rval = c * 17;
- break;
+ break;
case 0x30: gval = c * 17;
- break;
+ break;
}
} else if (fmt == ILBM_HAM8) {
int c = (col & 0x3f);
switch(col & 0xc0) {
case 0x00: if (c >= 0 && c < colors) {
- rval = pal[3*c + 0];
- gval = pal[3*c + 1];
- bval = pal[3*c + 2];
- }
- break;
+ rval = pal[3*c + 0];
+ gval = pal[3*c + 1];
+ bval = pal[3*c + 2];
+ }
+ break;
case 0x40: bval = (bval & 3) | (c << 2);
- break;
+ break;
case 0x80: rval = (rval & 3) | (c << 2);
- break;
+ break;
case 0xc0: gval = (rval & 3) | (c << 2);
}
}
}
delete decod;
- return FALSE;
+ return false;
}
if ((error == wxIFF_TRUNCATED) && verbose)
wxOutputStream& WXUNUSED(stream), bool verbose)
{
if (verbose)
+ {
wxLogDebug(wxT("IFF: the handler is read-only!!"));
+ }
- return FALSE;
+ return false;
}
bool wxIFFHandler::DoCanRead(wxInputStream& stream)
{
- wxIFFDecoder *decod;
- bool ok;
-
- decod = new wxIFFDecoder(&stream);
- ok = decod->CanRead();
- delete decod;
+ wxIFFDecoder decod(&stream);
- return ok;
+ return decod.CanRead();
+ // it's ok to modify the stream position here
}
#endif // wxUSE_STREAMS
projects / wxWidgets.git / blobdiff