mirror of
https://github.com/php/php-src.git
synced 2024-09-22 10:27:25 +00:00
581 lines
16 KiB
C
581 lines
16 KiB
C
#include <stdio.h>
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#include <math.h>
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#include <string.h>
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#include <stdlib.h>
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#include "gd.h"
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#include "php.h"
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/* Used only when debugging GIF compression code */
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/* #define DEBUGGING_ENVARS */
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#ifdef DEBUGGING_ENVARS
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static int verbose_set = 0;
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static int verbose;
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#define VERBOSE (verbose_set?verbose:set_verbose())
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static int set_verbose(void)
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{
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verbose = !!getenv("GIF_VERBOSE");
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verbose_set = 1;
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return(verbose);
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}
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#else
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#define VERBOSE 0
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#endif
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#define MAXCOLORMAPSIZE 256
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#define TRUE 1
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#define FALSE 0
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#define CM_RED 0
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#define CM_GREEN 1
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#define CM_BLUE 2
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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) (gdGetBuf(buffer, len, file) != 0)
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#define LM_to_uint(a,b) (((b)<<8)|(a))
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/* We may eventually want to use this information, but def it out for now */
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#if 0
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static struct {
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unsigned int Width;
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unsigned int Height;
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unsigned char ColorMap[3][MAXCOLORMAPSIZE];
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unsigned int BitPixel;
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unsigned int ColorResolution;
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unsigned int Background;
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unsigned int AspectRatio;
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} GifScreen;
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#endif
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static 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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static int ReadColorMap (gdIOCtx *fd, int number, unsigned char (*buffer)[256]);
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static int DoExtension (gdIOCtx *fd, int label, int *Transparent);
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static int GetDataBlock (gdIOCtx *fd, unsigned char *buf);
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static int GetCode (gdIOCtx *fd, int code_size, int flag);
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static int LWZReadByte (gdIOCtx *fd, int flag, int input_code_size);
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static void ReadImage (gdImagePtr im, gdIOCtx *fd, int len, int height, unsigned char (*cmap)[256], int interlace); /*1.4//, int ignore); */
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int ZeroDataBlock;
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gdImagePtr gdImageCreateFromGifSource(gdSourcePtr inSource)
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{
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gdIOCtx *in = gdNewSSCtx(inSource, NULL);
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gdImagePtr im;
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im = gdImageCreateFromGifCtx(in);
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in->gd_free(in);
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return im;
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}
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gdImagePtr
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gdImageCreateFromGif(FILE *fdFile)
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{
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gdIOCtx *fd = gdNewFileCtx(fdFile);
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gdImagePtr im = 0;
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im = gdImageCreateFromGifCtx(fd);
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fd->gd_free(fd);
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return im;
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}
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gdImagePtr
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gdImageCreateFromGifCtx(gdIOCtxPtr fd)
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{
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/* 1.4 int imageNumber; */
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int BitPixel;
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int ColorResolution;
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int Background;
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int AspectRatio;
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int Transparent = (-1);
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unsigned char buf[16];
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unsigned char c;
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unsigned char ColorMap[3][MAXCOLORMAPSIZE];
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unsigned char localColorMap[3][MAXCOLORMAPSIZE];
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int imw, imh;
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int useGlobalColormap;
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int bitPixel;
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int i;
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/*1.4//int imageCount = 0; */
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char version[4];
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gdImagePtr im = 0;
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ZeroDataBlock = FALSE;
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/*1.4//imageNumber = 1; */
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if (! ReadOK(fd,buf,6)) {
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return 0;
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}
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if (strncmp((char *)buf,"GIF",3) != 0) {
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return 0;
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}
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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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return 0;
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}
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if (! ReadOK(fd,buf,7)) {
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return 0;
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}
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BitPixel = 2<<(buf[4]&0x07);
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ColorResolution = (int) (((buf[4]&0x70)>>3)+1);
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Background = buf[5];
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AspectRatio = buf[6];
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if (BitSet(buf[4], LOCALCOLORMAP)) { /* Global Colormap */
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if (ReadColorMap(fd, BitPixel, ColorMap)) {
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return 0;
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}
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}
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for (;;) {
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if (! ReadOK(fd,&c,1)) {
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return 0;
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}
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if (c == ';') { /* GIF terminator */
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goto terminated;
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}
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if (c == '!') { /* Extension */
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if (! ReadOK(fd,&c,1)) {
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return 0;
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}
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DoExtension(fd, c, &Transparent);
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continue;
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}
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if (c != ',') { /* Not a valid start character */
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continue;
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}
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/*1.4//++imageCount; */
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if (! ReadOK(fd,buf,9)) {
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return 0;
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}
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useGlobalColormap = ! BitSet(buf[8], LOCALCOLORMAP);
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bitPixel = 1<<((buf[8]&0x07)+1);
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imw = LM_to_uint(buf[4],buf[5]);
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imh = LM_to_uint(buf[6],buf[7]);
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if (!(im = gdImageCreate(imw, imh))) {
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return 0;
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}
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im->interlace = BitSet(buf[8], INTERLACE);
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if (! useGlobalColormap) {
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if (ReadColorMap(fd, bitPixel, localColorMap)) {
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return 0;
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}
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ReadImage(im, fd, imw, imh, localColorMap,
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BitSet(buf[8], INTERLACE));
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/*1.4//imageCount != imageNumber); */
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} else {
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ReadImage(im, fd, imw, imh,
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ColorMap,
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BitSet(buf[8], INTERLACE));
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/*1.4//imageCount != imageNumber); */
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}
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if (Transparent != (-1)) {
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gdImageColorTransparent(im, Transparent);
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}
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goto terminated;
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}
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terminated:
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/* Terminator before any image was declared! */
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if (!im) {
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return 0;
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}
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/* Check for open colors at the end, so
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we can reduce colorsTotal and ultimately
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BitsPerPixel */
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for (i=((im->colorsTotal-1)); (i>=0); i--) {
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if (im->open[i]) {
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im->colorsTotal--;
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} else {
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break;
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}
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}
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return im;
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}
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static int
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ReadColorMap(gdIOCtx *fd, int number, unsigned char (*buffer)[256])
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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 TRUE;
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}
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buffer[CM_RED][i] = rgb[0] ;
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buffer[CM_GREEN][i] = rgb[1] ;
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buffer[CM_BLUE][i] = rgb[2] ;
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}
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return FALSE;
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}
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static int
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DoExtension(gdIOCtx *fd, int label, int *Transparent)
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{
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static unsigned char buf[256];
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switch (label) {
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case 0xf9: /* 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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*Transparent = buf[3];
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while (GetDataBlock(fd, (unsigned char*) buf) != 0)
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;
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return FALSE;
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default:
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break;
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}
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while (GetDataBlock(fd, (unsigned char*) buf) != 0)
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;
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return FALSE;
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}
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static int
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GetDataBlock_(gdIOCtx *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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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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return -1;
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}
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return count;
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}
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static int
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GetDataBlock(gdIOCtx *fd, unsigned char *buf)
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{
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int rv;
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int i;
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char *tmp = NULL;
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rv = GetDataBlock_(fd,buf);
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if (VERBOSE) {
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if (rv > 0) {
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tmp = safe_emalloc(3 * rv, sizeof(char), 1);
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for (i=0;i<rv;i++) {
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sprintf(&tmp[3*sizeof(char)*i], " %02x", buf[i]);
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}
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} else {
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tmp = estrdup("");
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}
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php_gd_error_ex(E_NOTICE, "[GetDataBlock returning %d: %s]", rv, tmp);
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efree(tmp);
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}
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return(rv);
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}
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static int
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GetCode_(gdIOCtx *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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/* Oh well */
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}
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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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GetCode(gdIOCtx *fd, int code_size, int flag)
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{
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int rv;
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rv = GetCode_(fd,code_size,flag);
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if (VERBOSE) php_gd_error_ex(E_NOTICE, "[GetCode(,%d,%d) returning %d]\n",code_size,flag,rv);
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return(rv);
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}
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#define STACK_SIZE ((1<<(MAX_LWZ_BITS))*2)
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static int
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LWZReadByte_(gdIOCtx *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[STACK_SIZE], *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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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 =
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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 =
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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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return -2;
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}
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incode = code;
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if (sp == (stack + STACK_SIZE)) {
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/* Bad compressed data stream */
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return -1;
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}
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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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if (sp == (stack + STACK_SIZE)) {
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/* Bad compressed data stream */
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return -1;
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}
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*sp++ = table[1][code];
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if (code == table[0][code]) {
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/* Oh well */
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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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|
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static int
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LWZReadByte(gdIOCtx *fd, int flag, int input_code_size)
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{
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int rv;
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rv = LWZReadByte_(fd,flag,input_code_size);
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if (VERBOSE) php_gd_error_ex(E_NOTICE, "[LWZReadByte(,%d,%d) returning %d]\n",flag,input_code_size,rv);
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return(rv);
|
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}
|
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|
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static void
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ReadImage(gdImagePtr im, gdIOCtx *fd, int len, int height, unsigned char (*cmap)[256], int interlace) /*1.4//, int ignore) */
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{
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unsigned char c;
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int v;
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int xpos = 0, ypos = 0, pass = 0;
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int i;
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/* Stash the color map into the image */
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for (i=0; (i<gdMaxColors); i++) {
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im->red[i] = cmap[CM_RED][i];
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im->green[i] = cmap[CM_GREEN][i];
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im->blue[i] = cmap[CM_BLUE][i];
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im->open[i] = 1;
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}
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/* Many (perhaps most) of these colors will remain marked open. */
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im->colorsTotal = gdMaxColors;
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/*
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** Initialize the Compression routines
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*/
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if (! ReadOK(fd,&c,1)) {
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return;
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}
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if (LWZReadByte(fd, TRUE, c) < 0) {
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return;
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}
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|
|
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/*
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** If this is an "uninteresting picture" ignore it.
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** REMOVED For 1.4
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*/
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/*if (ignore) { */
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/* while (LWZReadByte(fd, FALSE, c) >= 0) */
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/* ; */
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/* return; */
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/*} */
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while ((v = LWZReadByte(fd,FALSE,c)) >= 0 ) {
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/* This how we recognize which colors are actually used. */
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if (im->open[v]) {
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im->open[v] = 0;
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}
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gdImageSetPixel(im, xpos, ypos, v);
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++xpos;
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if (xpos == len) {
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xpos = 0;
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if (interlace) {
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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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|
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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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} else {
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++ypos;
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}
|
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}
|
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if (ypos >= height)
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break;
|
|
}
|
|
|
|
fini:
|
|
if (LWZReadByte(fd,FALSE,c)>=0) {
|
|
/* Ignore extra */
|
|
}
|
|
}
|
|
|