683 lines
15 KiB
C
683 lines
15 KiB
C
/* GIF reading routines based on those in pbmplus:ppm/giftoppm.c, bearing
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* following copyright notice:
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*/
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/* +-------------------------------------------------------------------+ */
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/* | Copyright 1990, David Koblas. | */
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/* | Permission to use, copy, modify, and distribute this software | */
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/* | and its documentation for any purpose and without fee is hereby | */
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/* | granted, provided that the above copyright notice appear in all | */
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/* | copies and that both that copyright notice and this permission | */
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/* | notice appear in supporting documentation. This software is | */
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/* | provided "as is" without express or implied warranty. | */
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/* +-------------------------------------------------------------------+ */
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#include "config.h"
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#include "tile.h"
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#ifndef MONITOR_HEAP
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extern long *alloc(unsigned int);
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#endif
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#define PPM_ASSIGN(p,red,grn,blu) do { (p).r = (red); (p).g = (grn); (p).b = (blu); } while ( 0 )
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#define MAX_LWZ_BITS 12
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#define INTERLACE 0x40
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#define LOCALCOLORMAP 0x80
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#define BitSet(byte, bit) (((byte) & (bit)) == (bit))
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#define ReadOK(file,buffer,len) (fread((void *)buffer, (int)len, 1, file) != 0)
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#define LM_to_uint(a,b) (((b)<<8)|(a))
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struct gifscreen {
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int Width;
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int Height;
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int Colors;
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int ColorResolution;
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int Background;
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int AspectRatio;
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int Interlace;
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} GifScreen;
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struct {
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int transparent;
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int delayTime;
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int inputFlag;
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int disposal;
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} Gif89 = { -1, -1, -1, 0 };
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int ZeroDataBlock = FALSE;
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static FILE *gif_file;
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static int tiles_across, tiles_down, curr_tiles_across, curr_tiles_down;
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static pixel **image;
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static unsigned char input_code_size;
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static int GetDataBlock(FILE *fd, unsigned char *buf);
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static void DoExtension(FILE *fd, int label);
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static boolean ReadColorMap(FILE *fd, int number);
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static void read_header(FILE *fd);
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static int GetCode(FILE *fd, int code_size, int flag);
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static int LWZReadByte(FILE *fd, int flag, int input_code_size);
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static void ReadInterleavedImage(FILE *fd, int len, int height);
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static void ReadTileStrip(FILE *fd, int len);
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/* These should be in gif.h, but there isn't one. */
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boolean fopen_gif_file(const char *, const char *);
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boolean read_gif_tile(pixel(*)[TILE_X]);
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int fclose_gif_file(void);
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static int
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GetDataBlock(FILE *fd, unsigned char *buf)
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{
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unsigned char count;
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if (!ReadOK(fd,&count,1)) {
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Fprintf(stderr, "error in getting DataBlock size\n");
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return -1;
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}
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ZeroDataBlock = (count == 0);
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if ((count != 0) && (!ReadOK(fd, buf, count))) {
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Fprintf(stderr, "error in reading DataBlock\n");
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return -1;
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}
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return count;
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}
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static void
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DoExtension(FILE *fd, int label)
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{
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static char buf[256];
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char *str;
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switch (label) {
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case 0x01: /* Plain Text Extension */
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str = "Plain Text Extension";
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#ifdef notdef
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if (GetDataBlock(fd, (unsigned char*) buf) == 0)
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;
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lpos = LM_to_uint(buf[0], buf[1]);
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tpos = LM_to_uint(buf[2], buf[3]);
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width = LM_to_uint(buf[4], buf[5]);
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height = LM_to_uint(buf[6], buf[7]);
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cellw = buf[8];
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cellh = buf[9];
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foreground = buf[10];
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background = buf[11];
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while (GetDataBlock(fd, (unsigned char*) buf) != 0) {
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PPM_ASSIGN(image[ypos][xpos],
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cmap[CM_RED][v],
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cmap[CM_GREEN][v],
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cmap[CM_BLUE][v]);
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++index;
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}
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return;
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#else
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break;
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#endif
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case 0xff: /* Application Extension */
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str = "Application Extension";
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break;
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case 0xfe: /* Comment Extension */
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str = "Comment Extension";
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while (GetDataBlock(fd, (unsigned char*) buf) != 0) {
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Fprintf(stderr, "gif comment: %s\n", buf );
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}
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return;
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case 0xf9: /* Graphic Control Extension */
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str = "Graphic Control Extension";
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(void) GetDataBlock(fd, (unsigned char*) buf);
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Gif89.disposal = (buf[0] >> 2) & 0x7;
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Gif89.inputFlag = (buf[0] >> 1) & 0x1;
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Gif89.delayTime = LM_to_uint(buf[1],buf[2]);
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if ((buf[0] & 0x1) != 0)
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Gif89.transparent = buf[3];
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while (GetDataBlock(fd, (unsigned char*) buf) != 0)
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;
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return;
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default:
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str = buf;
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Sprintf(buf, "UNKNOWN (0x%02x)", label);
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break;
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}
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Fprintf(stderr, "got a '%s' extension\n", str);
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while (GetDataBlock(fd, (unsigned char*) buf) != 0)
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;
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}
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static
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boolean
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ReadColorMap(FILE *fd, int number)
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{
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int i;
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unsigned char rgb[3];
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for (i = 0; i < number; ++i) {
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if (!ReadOK(fd, rgb, sizeof(rgb))) {
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return(FALSE);
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}
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ColorMap[CM_RED][i] = rgb[0] ;
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ColorMap[CM_GREEN][i] = rgb[1] ;
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ColorMap[CM_BLUE][i] = rgb[2] ;
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}
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colorsinmap = number;
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return TRUE;
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}
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/*
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* Read gif header, including colormaps. We expect only one image per
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* file, so if that image has a local colormap, overwrite the global one.
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*/
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static void
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read_header(FILE *fd)
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{
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unsigned char buf[16];
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unsigned char c;
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char version[4];
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if (!ReadOK(fd,buf,6)) {
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Fprintf(stderr, "error reading magic number\n");
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exit(EXIT_FAILURE);
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}
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if (strncmp((void *)buf,"GIF",3) != 0) {
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Fprintf(stderr, "not a GIF file\n");
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exit(EXIT_FAILURE);
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}
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(void) strncpy(version, (char *)buf + 3, 3);
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version[3] = '\0';
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if ((strcmp(version, "87a") != 0) && (strcmp(version, "89a") != 0)) {
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Fprintf(stderr, "bad version number, not '87a' or '89a'\n");
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exit(EXIT_FAILURE);
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}
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if (!ReadOK(fd,buf,7)) {
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Fprintf(stderr, "failed to read screen descriptor\n");
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exit(EXIT_FAILURE);
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}
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GifScreen.Width = LM_to_uint(buf[0],buf[1]);
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GifScreen.Height = LM_to_uint(buf[2],buf[3]);
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GifScreen.Colors = 2<<(buf[4]&0x07);
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GifScreen.ColorResolution = (((buf[4]&0x70)>>3)+1);
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GifScreen.Background = buf[5];
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GifScreen.AspectRatio = buf[6];
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if (BitSet(buf[4], LOCALCOLORMAP)) { /* Global Colormap */
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if (!ReadColorMap(fd, GifScreen.Colors)) {
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Fprintf(stderr, "error reading global colormap\n");
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exit(EXIT_FAILURE);
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}
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}
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if (GifScreen.AspectRatio != 0 && GifScreen.AspectRatio != 49) {
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Fprintf(stderr, "warning - non-square pixels\n");
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}
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for (;;) {
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if (!ReadOK(fd,&c,1)) {
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Fprintf(stderr, "EOF / read error on image data\n");
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exit(EXIT_FAILURE);
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}
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if (c == ';') { /* GIF terminator */
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return;
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}
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if (c == '!') { /* Extension */
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if (!ReadOK(fd,&c,1)) {
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Fprintf(stderr,
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"EOF / read error on extension function code\n");
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exit(EXIT_FAILURE);
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}
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DoExtension(fd, (int)c);
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continue;
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}
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if (c != ',') { /* Not a valid start character */
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Fprintf(stderr,
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"bogus character 0x%02x, ignoring\n", (int) c);
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continue;
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}
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if (!ReadOK(fd,buf,9)) {
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Fprintf(stderr, "couldn't read left/top/width/height\n");
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exit(EXIT_FAILURE);
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}
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if (BitSet(buf[8], LOCALCOLORMAP)) {
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/* replace global color map with local */
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GifScreen.Colors = 1<<((buf[8]&0x07)+1);
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if (!ReadColorMap(fd, GifScreen.Colors)) {
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Fprintf(stderr, "error reading local colormap\n");
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exit(EXIT_FAILURE);
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}
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}
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if (GifScreen.Width != LM_to_uint(buf[4],buf[5])) {
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Fprintf(stderr, "warning: widths don't match\n");
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GifScreen.Width = LM_to_uint(buf[4],buf[5]);
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}
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if (GifScreen.Height != LM_to_uint(buf[6],buf[7])) {
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Fprintf(stderr, "warning: heights don't match\n");
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GifScreen.Height = LM_to_uint(buf[6],buf[7]);
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}
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GifScreen.Interlace = BitSet(buf[8], INTERLACE);
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return;
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}
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}
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static int
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GetCode(FILE *fd, int code_size, int flag)
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{
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static unsigned char buf[280];
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static int curbit, lastbit, done, last_byte;
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int i, j, ret;
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unsigned char count;
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if (flag) {
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curbit = 0;
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lastbit = 0;
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done = FALSE;
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return 0;
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}
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if ((curbit+code_size) >= lastbit) {
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if (done) {
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if (curbit >= lastbit)
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Fprintf(stderr, "ran off the end of my bits\n");
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return -1;
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}
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buf[0] = buf[last_byte-2];
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buf[1] = buf[last_byte-1];
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if ((count = GetDataBlock(fd, &buf[2])) == 0)
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done = TRUE;
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last_byte = 2 + count;
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curbit = (curbit - lastbit) + 16;
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lastbit = (2+count)*8 ;
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}
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ret = 0;
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for (i = curbit, j = 0; j < code_size; ++i, ++j)
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ret |= ((buf[ i / 8 ] & (1 << (i % 8))) != 0) << j;
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curbit += code_size;
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return ret;
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}
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static int
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LWZReadByte(FILE *fd, int flag, int input_code_size)
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{
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static int fresh = FALSE;
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int code, incode;
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static int code_size, set_code_size;
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static int max_code, max_code_size;
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static int firstcode, oldcode;
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static int clear_code, end_code;
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static int table[2][(1<< MAX_LWZ_BITS)];
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static int stack[(1<<(MAX_LWZ_BITS))*2], *sp;
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register int i;
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if (flag) {
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set_code_size = input_code_size;
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code_size = set_code_size+1;
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clear_code = 1 << set_code_size ;
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end_code = clear_code + 1;
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max_code_size = 2*clear_code;
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max_code = clear_code+2;
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(void) GetCode(fd, 0, TRUE);
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fresh = TRUE;
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for (i = 0; i < clear_code; ++i) {
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table[0][i] = 0;
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table[1][i] = i;
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}
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for (; i < (1<<MAX_LWZ_BITS); ++i)
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table[0][i] = table[1][0] = 0;
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sp = stack;
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return 0;
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} else if (fresh) {
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fresh = FALSE;
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do {
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firstcode = oldcode = GetCode(fd, code_size, FALSE);
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} while (firstcode == clear_code);
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return firstcode;
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}
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if (sp > stack)
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return *--sp;
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while ((code = GetCode(fd, code_size, FALSE)) >= 0) {
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if (code == clear_code) {
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for (i = 0; i < clear_code; ++i) {
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table[0][i] = 0;
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table[1][i] = i;
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}
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for (; i < (1<<MAX_LWZ_BITS); ++i)
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table[0][i] = table[1][i] = 0;
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code_size = set_code_size+1;
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max_code_size = 2*clear_code;
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max_code = clear_code+2;
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sp = stack;
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firstcode = oldcode = GetCode(fd, code_size, FALSE);
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return firstcode;
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} else if (code == end_code) {
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int count;
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unsigned char buf[260];
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if (ZeroDataBlock)
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return -2;
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while ((count = GetDataBlock(fd, buf)) > 0)
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;
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if (count != 0)
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Fprintf(stderr,
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"missing EOD in data stream (common occurrence)\n");
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return -2;
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}
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incode = code;
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if (code >= max_code) {
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*sp++ = firstcode;
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code = oldcode;
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}
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while (code >= clear_code) {
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*sp++ = table[1][code];
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if (code == table[0][code]) {
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Fprintf(stderr, "circular table entry BIG ERROR\n");
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exit(EXIT_FAILURE);
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}
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code = table[0][code];
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}
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*sp++ = firstcode = table[1][code];
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if ((code = max_code) <(1<<MAX_LWZ_BITS)) {
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table[0][code] = oldcode;
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table[1][code] = firstcode;
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++max_code;
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if ((max_code >= max_code_size) &&
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(max_code_size < (1<<MAX_LWZ_BITS))) {
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max_code_size *= 2;
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++code_size;
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}
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}
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oldcode = incode;
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if (sp > stack)
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return *--sp;
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}
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return code;
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}
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static void
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ReadInterleavedImage(FILE *fd, int len, int height)
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{
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int v;
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int xpos = 0, ypos = 0, pass = 0;
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while ((v = LWZReadByte(fd,FALSE,(int)input_code_size)) >= 0 ) {
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PPM_ASSIGN(image[ypos][xpos], ColorMap[CM_RED][v],
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ColorMap[CM_GREEN][v], ColorMap[CM_BLUE][v]);
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++xpos;
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if (xpos == len) {
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xpos = 0;
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switch (pass) {
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case 0:
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case 1:
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ypos += 8; break;
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case 2:
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ypos += 4; break;
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case 3:
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ypos += 2; break;
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}
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if (ypos >= height) {
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++pass;
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switch (pass) {
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case 1:
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ypos = 4; break;
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case 2:
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ypos = 2; break;
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case 3:
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ypos = 1; break;
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default:
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goto fini;
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}
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}
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}
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if (ypos >= height)
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break;
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}
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fini:
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if (LWZReadByte(fd,FALSE,(int)input_code_size)>=0)
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Fprintf(stderr, "too much input data, ignoring extra...\n");
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}
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static
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void
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ReadTileStrip(FILE *fd, int len)
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{
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int v;
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int xpos = 0, ypos = 0;
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while ((v = LWZReadByte(fd,FALSE,(int)input_code_size)) >= 0 ) {
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PPM_ASSIGN(image[ypos][xpos], ColorMap[CM_RED][v],
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ColorMap[CM_GREEN][v], ColorMap[CM_BLUE][v]);
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++xpos;
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if (xpos == len) {
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xpos = 0;
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++ypos;
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}
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if (ypos >= TILE_Y)
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break;
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}
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}
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boolean
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fopen_gif_file(const char *filename, const char *type)
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{
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int i;
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if (strcmp(type, RDBMODE)) {
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Fprintf(stderr, "using reading routine for non-reading?\n");
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return FALSE;
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}
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gif_file = fopen(filename, type);
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if (gif_file == (FILE *)0) {
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Fprintf(stderr, "cannot open gif file %s\n", filename);
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return FALSE;
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}
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read_header(gif_file);
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if (GifScreen.Width % TILE_X) {
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Fprintf(stderr, "error: width %d not divisible by %d\n",
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GifScreen.Width, TILE_X);
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exit(EXIT_FAILURE);
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}
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tiles_across = GifScreen.Width / TILE_X;
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curr_tiles_across = 0;
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if (GifScreen.Height % TILE_Y) {
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Fprintf(stderr, "error: height %d not divisible by %d\n",
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GifScreen.Height, TILE_Y);
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/* exit(EXIT_FAILURE) */;
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}
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tiles_down = GifScreen.Height / TILE_Y;
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curr_tiles_down = 0;
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if (GifScreen.Interlace) {
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/* sigh -- hope this doesn't happen on micros */
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image = (pixel **)alloc(GifScreen.Height * sizeof(pixel *));
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for (i = 0; i < GifScreen.Height; i++) {
|
|
image[i] = (pixel *) alloc(GifScreen.Width * sizeof(pixel));
|
|
}
|
|
} else {
|
|
image = (pixel **)alloc(TILE_Y * sizeof(pixel *));
|
|
for (i = 0; i < TILE_Y; i++) {
|
|
image[i] = (pixel *) alloc(GifScreen.Width * sizeof(pixel));
|
|
}
|
|
}
|
|
|
|
/*
|
|
** Initialize the Compression routines
|
|
*/
|
|
if (!ReadOK(gif_file,&input_code_size,1)) {
|
|
Fprintf(stderr, "EOF / read error on image data\n");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
if (LWZReadByte(gif_file, TRUE, (int)input_code_size) < 0) {
|
|
Fprintf(stderr, "error reading image\n");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
/* read first section */
|
|
if (GifScreen.Interlace) {
|
|
ReadInterleavedImage(gif_file,
|
|
GifScreen.Width,GifScreen.Height);
|
|
} else {
|
|
ReadTileStrip(gif_file,GifScreen.Width);
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
/* Read a tile. Returns FALSE when there are no more tiles */
|
|
boolean
|
|
read_gif_tile(pixel (*pixels)[TILE_X])
|
|
{
|
|
int i, j;
|
|
|
|
if (curr_tiles_down >= tiles_down) return FALSE;
|
|
if (curr_tiles_across == tiles_across) {
|
|
curr_tiles_across = 0;
|
|
curr_tiles_down++;
|
|
if (curr_tiles_down >= tiles_down) return FALSE;
|
|
if (!GifScreen.Interlace)
|
|
ReadTileStrip(gif_file,GifScreen.Width);
|
|
}
|
|
if (GifScreen.Interlace) {
|
|
for (j = 0; j < TILE_Y; j++) {
|
|
for (i = 0; i < TILE_X; i++) {
|
|
pixels[j][i] = image[curr_tiles_down*TILE_Y + j]
|
|
[curr_tiles_across*TILE_X + i];
|
|
}
|
|
}
|
|
} else {
|
|
for (j = 0; j < TILE_Y; j++) {
|
|
for (i = 0; i < TILE_X; i++) {
|
|
pixels[j][i] = image[j][curr_tiles_across*TILE_X + i];
|
|
}
|
|
}
|
|
}
|
|
curr_tiles_across++;
|
|
|
|
/* check for "filler" tile */
|
|
for (j = 0; j < TILE_Y; j++) {
|
|
for (i = 0; i < TILE_X && i < 4; i += 2) {
|
|
if (pixels[j][i].r != ColorMap[CM_RED][0] ||
|
|
pixels[j][i].g != ColorMap[CM_GREEN][0] ||
|
|
pixels[j][i].b != ColorMap[CM_BLUE][0] ||
|
|
pixels[j][i+1].r != ColorMap[CM_RED][1] ||
|
|
pixels[j][i+1].g != ColorMap[CM_GREEN][1] ||
|
|
pixels[j][i+1].b != ColorMap[CM_BLUE][1])
|
|
return TRUE;
|
|
}
|
|
}
|
|
return FALSE;
|
|
}
|
|
|
|
int
|
|
fclose_gif_file(void)
|
|
{
|
|
int i;
|
|
|
|
if (GifScreen.Interlace) {
|
|
for (i = 0; i < GifScreen.Height; i++) {
|
|
free((void *)image[i]);
|
|
}
|
|
free((void *)image);
|
|
} else {
|
|
for (i = 0; i < TILE_Y; i++) {
|
|
free((void *)image[i]);
|
|
}
|
|
free((void *)image);
|
|
}
|
|
return(fclose(gif_file));
|
|
}
|
|
|
|
static char *std_args[] = { "tilemap", /* dummy argv[0] */
|
|
"monsters.gif", "monsters.txt",
|
|
"objects.gif", "objects.txt",
|
|
"other.gif", "other.txt" };
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
pixel pixels[TILE_Y][TILE_X];
|
|
|
|
if (argc == 1) {
|
|
argc = SIZE(std_args);
|
|
argv = std_args;
|
|
} else if (argc != 3) {
|
|
Fprintf(stderr, "usage: gif2txt giffile txtfile\n");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
while (argc > 1) {
|
|
if (!fopen_gif_file(argv[1], RDBMODE))
|
|
exit(EXIT_FAILURE);
|
|
|
|
init_colormap();
|
|
|
|
if (!fopen_text_file(argv[2], WRTMODE)) {
|
|
(void) fclose_gif_file();
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
while (read_gif_tile(pixels))
|
|
(void) write_text_tile(pixels);
|
|
|
|
(void) fclose_gif_file();
|
|
(void) fclose_text_file();
|
|
|
|
argc -= 2;
|
|
argv += 2;
|
|
}
|
|
exit(EXIT_SUCCESS);
|
|
/*NOTREACHED*/
|
|
return 0;
|
|
}
|