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https://github.com/DrBeef/ioq3quest.git
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make pcx decoder more robust against corrupt files
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parent
85ba66e7e8
commit
c77f537ae3
1 changed files with 96 additions and 91 deletions
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@ -1,6 +1,7 @@
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/*
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===========================================================================
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Copyright (C) 1999-2005 Id Software, Inc.
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2008 Ludwig Nussel
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This file is part of Quake III Arena source code.
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@ -31,40 +32,54 @@ PCX files are used for 8 bit images
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*/
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typedef struct {
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char manufacturer;
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char version;
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char encoding;
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char bits_per_pixel;
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unsigned short xmin,ymin,xmax,ymax;
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unsigned short hres,vres;
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unsigned char palette[48];
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char reserved;
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char color_planes;
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unsigned short bytes_per_line;
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unsigned short palette_type;
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char filler[58];
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unsigned char data; // unbounded
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char manufacturer;
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char version;
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char encoding;
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char bits_per_pixel;
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unsigned short xmin,ymin,xmax,ymax;
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unsigned short hres,vres;
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unsigned char palette[48];
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char reserved;
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char color_planes;
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unsigned short bytes_per_line;
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unsigned short palette_type;
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unsigned short hscreensize, vscreensize;
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char filler[54];
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unsigned char data[];
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} pcx_t;
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static void _LoadPCX ( const char *filename, byte **pic, byte **palette, int *width, int *height)
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void LoadPCX ( const char *filename, byte **pic, int *width, int *height)
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{
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byte *raw;
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byte *end;
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pcx_t *pcx;
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int x, y;
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int len;
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int dataByte, runLength;
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unsigned char dataByte = 0, runLength = 0;
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byte *out, *pix;
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unsigned xmax, ymax;
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unsigned short w, h;
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byte *pic8;
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byte *palette;
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int i;
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unsigned size = 0;
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if (width)
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*width = 0;
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if (height)
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*height = 0;
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*pic = NULL;
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*palette = NULL;
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//
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// load the file
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//
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len = ri.FS_ReadFile( ( char * ) filename, (void **)&raw);
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if (!raw) {
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if (!raw || len < 0) {
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return;
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}
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if((unsigned)len < sizeof(pcx_t))
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{
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ri.Printf (PRINT_ALL, "PCX truncated: %s\n", filename);
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ri.FS_FreeFile (raw);
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return;
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}
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@ -72,95 +87,85 @@ static void _LoadPCX ( const char *filename, byte **pic, byte **palette, int *wi
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// parse the PCX file
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//
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pcx = (pcx_t *)raw;
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raw = &pcx->data;
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end = raw+len;
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xmax = LittleShort(pcx->xmax);
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ymax = LittleShort(pcx->ymax);
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w = LittleShort(pcx->xmax)+1;
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h = LittleShort(pcx->ymax)+1;
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if (pcx->manufacturer != 0x0a
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|| pcx->version != 5
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|| pcx->encoding != 1
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|| pcx->color_planes != 1
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|| pcx->bits_per_pixel != 8
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|| xmax >= 1024
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|| ymax >= 1024)
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|| w >= 1024
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|| h >= 1024)
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{
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ri.Printf (PRINT_ALL, "Bad pcx file %s (%i x %i) (%i x %i)\n", filename, xmax+1, ymax+1, pcx->xmax, pcx->ymax);
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ri.Printf (PRINT_ALL, "Bad or unsupported pcx file %s (%dx%d@%d)\n", filename, w, h, pcx->bits_per_pixel);
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return;
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}
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out = ri.Malloc ( (ymax+1) * (xmax+1) );
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pix = pic8 = ri.Malloc ( size );
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*pic = out;
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pix = out;
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if (palette)
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raw = pcx->data;
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// FIXME: should use bytes_per_line but original q3 didn't do that either
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while(pix < pic8+size)
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{
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*palette = ri.Malloc(768);
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Com_Memcpy (*palette, (byte *)pcx + len - 768, 768);
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if(runLength > 0) {
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*pix++ = dataByte;
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--runLength;
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continue;
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}
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if(raw+1 > end)
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break;
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dataByte = *raw++;
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if((dataByte & 0xC0) == 0xC0)
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{
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if(raw+1 > end)
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break;
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runLength = dataByte & 0x3F;
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dataByte = *raw++;
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}
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else
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runLength = 1;
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}
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if(pix < pic8+size)
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{
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ri.Printf (PRINT_ALL, "PCX file truncated: %s\n", filename);
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ri.FS_FreeFile (pcx);
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ri.Free (pic8);
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}
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if (raw-(byte*)pcx >= end - (byte*)769 || end[-769] != 0x0c)
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{
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ri.Printf (PRINT_ALL, "PCX missing palette: %s\n", filename);
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ri.FS_FreeFile (pcx);
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ri.Free (pic8);
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return;
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}
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palette = end-768;
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pix = out = ri.Malloc(4 * size );
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for (i = 0 ; i < size ; i++)
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{
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unsigned char p = pic8[i];
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pix[0] = palette[p*3];
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pix[1] = palette[p*3 + 1];
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pix[2] = palette[p*3 + 2];
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pix[3] = 255;
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pix += 4;
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}
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if (width)
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*width = xmax+1;
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*width = w;
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if (height)
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*height = ymax+1;
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// FIXME: use bytes_per_line here?
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*height = h;
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for (y=0 ; y<=ymax ; y++, pix += xmax+1)
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{
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for (x=0 ; x<=xmax ; )
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{
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dataByte = *raw++;
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if((dataByte & 0xC0) == 0xC0)
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{
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runLength = dataByte & 0x3F;
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dataByte = *raw++;
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}
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else
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runLength = 1;
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while(runLength-- > 0)
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pix[x++] = dataByte;
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}
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}
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if ( raw - (byte *)pcx > len)
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{
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ri.Printf (PRINT_DEVELOPER, "PCX file %s was malformed", filename);
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ri.Free (*pic);
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*pic = NULL;
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}
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*pic = out;
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ri.FS_FreeFile (pcx);
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}
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void LoadPCX ( const char *filename, byte **pic, int *width, int *height) {
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byte *palette;
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byte *pic8;
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int i, c, p;
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byte *pic32;
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_LoadPCX (filename, &pic8, &palette, width, height);
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if (!pic8) {
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*pic = NULL;
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return;
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}
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// LoadPCX32 ensures width, height < 1024
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c = (*width) * (*height);
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pic32 = *pic = ri.Malloc(4 * c );
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for (i = 0 ; i < c ; i++) {
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p = pic8[i];
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pic32[0] = palette[p*3];
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pic32[1] = palette[p*3 + 1];
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pic32[2] = palette[p*3 + 2];
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pic32[3] = 255;
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pic32 += 4;
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}
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ri.Free (pic8);
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ri.Free (palette);
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}
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