implementation of wxGetPasswordFromUser

[wxWidgets.git] / src / common / gifdecod.cpp

diff --git a/src/common/gifdecod.cpp b/src/common/gifdecod.cpp
index 047189cc519eafd9a20658bd4a5b311327d95cd6..66c9aad915b90b6f252fc7553e6c5c9eb3e51c66 100644 (file)
--- a/src/common/gifdecod.cpp
+++ b/src/common/gifdecod.cpp
@@ -2,8 +2,8 @@
 // Name:        gifdecod.cpp
 // Purpose:     wxGIFDecoder, GIF reader for wxImage and wxAnimation
 // Author:      Guillermo Rodriguez Garcia <guille@iies.es>
 // Name:        gifdecod.cpp
 // Purpose:     wxGIFDecoder, GIF reader for wxImage and wxAnimation
 // Author:      Guillermo Rodriguez Garcia <guille@iies.es>

-// Version:     3.01
-// Last rev:    1999/08/14
+// Version:     3.04
+// RCS-ID:      $Id$

 // Copyright:   (c) Guillermo Rodriguez Garcia
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 // Copyright:   (c) Guillermo Rodriguez Garcia
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////


@@ -20,16 +20,15 @@
 #endif
 
 #ifndef WX_PRECOMP
 #endif
 
 #ifndef WX_PRECOMP

-#  include "wx/setup.h"
+#  include "wx/defs.h"

 #endif
 
 #endif
 

-#if wxUSE_STREAMS
+#if wxUSE_STREAMS && wxUSE_GIF

 
 #include <stdlib.h>
 #include <string.h>
 
 #include <stdlib.h>
 #include <string.h>

-#include "wx/defs.h"

 #include "wx/gifdecod.h"
 #include "wx/gifdecod.h"

- 
+

 
 //---------------------------------------------------------------------------
 // wxGIFDecoder constructor and destructor
 
 //---------------------------------------------------------------------------
 // wxGIFDecoder constructor and destructor


@@ -58,7 +57,7 @@ wxGIFDecoder::~wxGIFDecoder()
 
 void wxGIFDecoder::Destroy()
 {
 
 void wxGIFDecoder::Destroy()
 {

-    IMAGEN *pimg, *paux;
+    GIFImage *pimg, *paux;

 
     pimg = m_pfirst;
 
 
     pimg = m_pfirst;
 


@@ -67,7 +66,7 @@ void wxGIFDecoder::Destroy()
         paux = pimg->next;
         free(pimg->p);
         free(pimg->pal);
         paux = pimg->next;
         free(pimg->p);
         free(pimg->pal);

-        free(pimg);
+        delete pimg;

         pimg = paux;
     }
 }
         pimg = paux;
     }
 }


@@ -85,6 +84,9 @@ bool wxGIFDecoder::ConvertToImage(wxImage *image) const
     unsigned long i;
     int      transparent;
 
     unsigned long i;
     int      transparent;
 

+    /* just in case... */
+    image->Destroy();
+

     /* create the image */
     image->Create(GetWidth(), GetHeight());
 
     /* create the image */
     image->Create(GetWidth(), GetHeight());
 


@@ -129,7 +131,7 @@ bool wxGIFDecoder::ConvertToImage(wxImage *image) const
     return TRUE;
 }
 
     return TRUE;
 }
 

-                 
+

 //---------------------------------------------------------------------------
 // Data accessors
 //---------------------------------------------------------------------------
 //---------------------------------------------------------------------------
 // Data accessors
 //---------------------------------------------------------------------------


@@ -200,7 +202,7 @@ bool wxGIFDecoder::GoNextFrame(bool cyclic)
     }
     else
         return FALSE;
     }
     else
         return FALSE;

-}            
+}

 
 bool wxGIFDecoder::GoPrevFrame(bool cyclic)
 {
 
 bool wxGIFDecoder::GoPrevFrame(bool cyclic)
 {


@@ -280,10 +282,14 @@ int wxGIFDecoder::getcode(int bits, int ab_fin)
                 code = ab_fin;
                 break;
             }
                 code = ab_fin;
                 break;
             }

+
+            /* prefetch data */
+            m_f->Read((void *) m_buffer, m_restbyte);
+            m_bufp = m_buffer;

         }
 
         /* read next byte and isolate the bits we need */
         }
 
         /* read next byte and isolate the bits we need */

-        m_lastbyte = (unsigned char)m_f->GetC();
+        m_lastbyte = (unsigned char) (*m_bufp++);

         mask       = (1 << (bits - m_restbits)) - 1;
         code       = code + ((m_lastbyte & mask) << m_restbits);
         m_restbyte--;
         mask       = (1 << (bits - m_restbits)) - 1;
         code       = code + ((m_lastbyte & mask) << m_restbits);
         m_restbyte--;


@@ -291,7 +297,7 @@ int wxGIFDecoder::getcode(int bits, int ab_fin)
         /* adjust total number of bits extracted from the buffer */
         m_restbits = m_restbits + 8;
     }
         /* adjust total number of bits extracted from the buffer */
         m_restbits = m_restbits + 8;
     }

-    
+

     /* find number of bits remaining for next code */
     m_restbits = (m_restbits - bits);
 
     /* find number of bits remaining for next code */
     m_restbits = (m_restbits - bits);
 


@@ -303,7 +309,7 @@ int wxGIFDecoder::getcode(int bits, int ab_fin)
 //  GIF decoding function. The initial code size (aka root size)
 //  is 'bits'. Supports interlaced images (interl == 1).
 //
 //  GIF decoding function. The initial code size (aka root size)
 //  is 'bits'. Supports interlaced images (interl == 1).
 //

-int wxGIFDecoder::dgif(IMAGEN *img, int interl, int bits)
+int wxGIFDecoder::dgif(GIFImage *img, int interl, int bits)

 {
     int ab_prefix[4096];        /* alphabet (prefixes) */
     int ab_tail[4096];          /* alphabet (tails) */
 {
     int ab_prefix[4096];        /* alphabet (prefixes) */
     int ab_tail[4096];          /* alphabet (tails) */


@@ -333,7 +339,7 @@ int wxGIFDecoder::dgif(IMAGEN *img, int interl, int bits)
     pass     = 1;
     pos = x = y = 0;
 
     pass     = 1;
     pos = x = y = 0;
 

-    /* reset static globals */
+    /* reset decoder vars */

     m_restbits = 0;
     m_restbyte = 0;
     m_lastbyte = 0;
     m_restbits = 0;
     m_restbyte = 0;
     m_lastbyte = 0;


@@ -436,14 +442,28 @@ int wxGIFDecoder::dgif(IMAGEN *img, int interl, int bits)
 }
 
 
 }
 
 

+// CanRead:
+//  Returns TRUE if the file looks like a valid GIF, FALSE otherwise.
+//
+bool wxGIFDecoder::CanRead()
+{
+    unsigned char buf[3];
+
+    m_f->Read(buf, 3);
+    m_f->SeekI(-3, wxFromCurrent);
+
+    return (memcmp(buf, "GIF", 3) == 0);
+}
+
+

 // ReadGIF:
 //  Reads and decodes one or more GIF images, depending on whether
 //  animated GIF support is enabled. Can read GIFs with any bit
 //  size (color depth), but the output images are always expanded
 //  to 8 bits per pixel. Also, the image palettes always contain
 // ReadGIF:
 //  Reads and decodes one or more GIF images, depending on whether
 //  animated GIF support is enabled. Can read GIFs with any bit
 //  size (color depth), but the output images are always expanded
 //  to 8 bits per pixel. Also, the image palettes always contain

-//  256 colors, although some of them may be unused. Returns E_OK
-//  (== 0) on success, or an error code if something fails. Error
-//  codes are E_ARCHIVO, E_FORMATO, E_MEMORIA (see header file).
+//  256 colors, although some of them may be unused. Returns GIF_OK
+//  (== 0) on success, or an error code if something fails (see
+//  header file for details)

 //
 int wxGIFDecoder::ReadGIF()
 {
 //
 int wxGIFDecoder::ReadGIF()
 {


@@ -453,15 +473,15 @@ int wxGIFDecoder::ReadGIF()
     unsigned char type;
     unsigned char pal[768];
     unsigned char buf[16];
     unsigned char type;
     unsigned char pal[768];
     unsigned char buf[16];

-    IMAGEN        **ppimg, *pimg, *pprev;
+    GIFImage      **ppimg, *pimg, *pprev;

 
 

+    /* check GIF signature */
+    if (!CanRead())
+        return wxGIF_INVFORMAT;

 
 

-    /* check GIF signature and animated GIF support (ver. >= 89a) */
+    /* check for and animated GIF support (ver. >= 89a) */

     m_f->Read(buf, 6);
 
     m_f->Read(buf, 6);
 

-    if (memcmp(buf, "GIF", 3) != 0)
-        return E_FORMATO;
-

     if (memcmp(buf + 3, "89a", 3) < 0)
         m_anim = FALSE;
 
     if (memcmp(buf + 3, "89a", 3) < 0)
         m_anim = FALSE;
 


@@ -489,7 +509,13 @@ int wxGIFDecoder::ReadGIF()
     pprev = NULL;
     pimg  = NULL;
 
     pprev = NULL;
     pimg  = NULL;
 

+#if defined(__VISAGECPP__)
+// VA just can't stand while(1)
+    bool bOs2var = TRUE;
+    while(bOs2var)
+#else

     while (1)
     while (1)

+#endif

     {
         type = (unsigned char)m_f->GetC();
 
     {
         type = (unsigned char)m_f->GetC();
 


@@ -517,14 +543,16 @@ int wxGIFDecoder::ReadGIF()
             }
             else
             /* other extension, skip */
             }
             else
             /* other extension, skip */

-            {   
+            {

                 while ((i = (unsigned char)m_f->GetC()) != 0)
                 {
                     /* This line should not be neccessary!
                      * Some images are not loaded correctly
                      * without it. A bug in wxStream?
                 while ((i = (unsigned char)m_f->GetC()) != 0)
                 {
                     /* This line should not be neccessary!
                      * Some images are not loaded correctly
                      * without it. A bug in wxStream?

+                     * Yes. Fixed now.

                      */
                     // m_f->SeekI(m_f->TellI(), wxFromStart);
                      */
                     // m_f->SeekI(m_f->TellI(), wxFromStart);

+

                     m_f->SeekI(i, wxFromCurrent);
                 }
             }
                     m_f->SeekI(i, wxFromCurrent);
                 }
             }


@@ -534,12 +562,12 @@ int wxGIFDecoder::ReadGIF()
         if (type == 0x2C)
         {
             /* allocate memory for IMAGEN struct */
         if (type == 0x2C)
         {
             /* allocate memory for IMAGEN struct */

-            pimg = (*ppimg) = (IMAGEN *) malloc(sizeof(IMAGEN));
+            pimg = (*ppimg) = new GIFImage();

 
             if (pimg == NULL)
             {
                 Destroy();
 
             if (pimg == NULL)
             {
                 Destroy();

-                return E_MEMORIA;
+                return wxGIF_MEMERR;

             }
 
             /* fill in the data */
             }
 
             /* fill in the data */


@@ -560,13 +588,13 @@ int wxGIFDecoder::ReadGIF()
             ppimg = &pimg->next;
 
             /* allocate memory for image and palette */
             ppimg = &pimg->next;
 
             /* allocate memory for image and palette */

-            pimg->p   = (unsigned char *) malloc(size);
+            pimg->p   = (unsigned char *) malloc((size_t)size);

             pimg->pal = (unsigned char *) malloc(768);
 
             if ((!pimg->p) || (!pimg->pal))
             {
                 Destroy();
             pimg->pal = (unsigned char *) malloc(768);
 
             if ((!pimg->p) || (!pimg->pal))
             {
                 Destroy();

-                return E_MEMORIA;
+                return wxGIF_MEMERR;

             }
 
             /* load local color map if available, else use global map */
             }
 
             /* load local color map if available, else use global map */


@@ -600,7 +628,7 @@ int wxGIFDecoder::ReadGIF()
         m_pimage = m_pfirst;
     }
 
         m_pimage = m_pfirst;
     }
 

-    return E_OK;
+    return wxGIF_OK;

 }
 
 }
 

-#endif // wxUSE_STREAM
+#endif // wxUSE_STREAMS && wxUSE_GIF