mirror of
https://github.com/php/php-src.git
synced 2025-01-02 17:03:40 +08:00
639 lines
14 KiB
C
639 lines
14 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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#if 0
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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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#endif
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#define STACK_SIZE ((1<<(MAX_LWZ_BITS))*2)
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typedef struct {
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unsigned char buf[280];
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int curbit, lastbit, done, last_byte;
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} CODE_STATIC_DATA;
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typedef struct {
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int fresh;
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int code_size, set_code_size;
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int max_code, max_code_size;
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int firstcode, oldcode;
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int clear_code, end_code;
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int table[2][(1<< MAX_LWZ_BITS)];
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int stack[STACK_SIZE], *sp;
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CODE_STATIC_DATA scd;
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} LZW_STATIC_DATA;
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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, int *ZeroDataBlockP);
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static int GetDataBlock (gdIOCtx *fd, unsigned char *buf, int *ZeroDataBlockP);
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static int GetCode (gdIOCtx *fd, CODE_STATIC_DATA *scd, int code_size, int flag, int *ZeroDataBlockP);
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static int LWZReadByte (gdIOCtx *fd, LZW_STATIC_DATA *sd, char flag, int input_code_size, int *ZeroDataBlockP);
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static void ReadImage (gdImagePtr im, gdIOCtx *fd, int len, int height, unsigned char (*cmap)[256], int interlace, int *ZeroDataBlockP); /*1.4//, int ignore); */
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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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/* }}} */
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gdImagePtr 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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/* }}} */
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gdImagePtr gdImageCreateFromGifCtx(gdIOCtxPtr fd) /* {{{ */
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{
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int BitPixel;
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#if 0
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int ColorResolution;
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int Background;
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int AspectRatio;
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#endif
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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, screen_width, screen_height;
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int gif87a, 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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int ZeroDataBlock = FALSE;
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int haveGlobalColormap;
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gdImagePtr im = 0;
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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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if (memcmp((char *)buf+3, "87a", 3) == 0) {
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gif87a = 1;
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} else if (memcmp((char *)buf+3, "89a", 3) == 0) {
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gif87a = 0;
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} else {
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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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#if 0
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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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#endif
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screen_width = imw = LM_to_uint(buf[0],buf[1]);
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screen_height = imh = LM_to_uint(buf[2],buf[3]);
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haveGlobalColormap = BitSet(buf[4], LOCALCOLORMAP); /* Global Colormap */
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if (haveGlobalColormap) {
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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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int top, left;
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int width, height;
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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, &ZeroDataBlock);
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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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left = LM_to_uint(buf[0], buf[1]);
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top = 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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if (left + width > screen_width || top + height > screen_height) {
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if (VERBOSE) {
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printf("Frame is not confined to screen dimension.\n");
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}
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return 0;
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}
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if (!(im = gdImageCreate(width, height))) {
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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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gdImageDestroy(im);
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return 0;
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}
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ReadImage(im, fd, width, height, localColorMap,
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BitSet(buf[8], INTERLACE), &ZeroDataBlock);
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} else {
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if (!haveGlobalColormap) {
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gdImageDestroy(im);
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return 0;
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}
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ReadImage(im, fd, width, height,
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ColorMap,
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BitSet(buf[8], INTERLACE), &ZeroDataBlock);
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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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if (!im->colorsTotal) {
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gdImageDestroy(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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/* }}} */
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static int 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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/* }}} */
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static int
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DoExtension(gdIOCtx *fd, int label, int *Transparent, int *ZeroDataBlockP)
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{
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unsigned char buf[256];
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switch (label) {
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case 0xf9: /* Graphic Control Extension */
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memset(buf, 0, 4); /* initialize a few bytes in the case the next function fails */
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(void) GetDataBlock(fd, (unsigned char*) buf, ZeroDataBlockP);
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#if 0
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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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#endif
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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, ZeroDataBlockP) > 0);
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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, ZeroDataBlockP) > 0)
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;
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return FALSE;
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}
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/* }}} */
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static int
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GetDataBlock_(gdIOCtx *fd, unsigned char *buf, int *ZeroDataBlockP)
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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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*ZeroDataBlockP = 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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/* }}} */
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static int
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GetDataBlock(gdIOCtx *fd, unsigned char *buf, int *ZeroDataBlockP)
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{
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int rv;
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int i;
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rv = GetDataBlock_(fd,buf, ZeroDataBlockP);
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if (VERBOSE) {
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char *tmp = NULL;
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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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/* }}} */
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static int
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GetCode_(gdIOCtx *fd, CODE_STATIC_DATA *scd, int code_size, int flag, int *ZeroDataBlockP)
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{
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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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scd->curbit = 0;
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scd->lastbit = 0;
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scd->last_byte = 0;
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scd->done = FALSE;
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return 0;
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}
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if ( (scd->curbit + code_size) >= scd->lastbit) {
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if (scd->done) {
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if (scd->curbit >= scd->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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scd->buf[0] = scd->buf[scd->last_byte-2];
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scd->buf[1] = scd->buf[scd->last_byte-1];
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if ((count = GetDataBlock(fd, &scd->buf[2], ZeroDataBlockP)) <= 0)
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scd->done = TRUE;
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scd->last_byte = 2 + count;
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scd->curbit = (scd->curbit - scd->lastbit) + 16;
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scd->lastbit = (2+count)*8 ;
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}
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ret = 0;
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for (i = scd->curbit, j = 0; j < code_size; ++i, ++j)
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ret |= ((scd->buf[ i / 8 ] & (1 << (i % 8))) != 0) << j;
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scd->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, CODE_STATIC_DATA *scd, int code_size, int flag, int *ZeroDataBlockP)
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{
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int rv;
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rv = GetCode_(fd, scd, code_size,flag, ZeroDataBlockP);
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if (VERBOSE) printf("[GetCode(,%d,%d) returning %d]\n",code_size,flag,rv);
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return(rv);
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}
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/* }}} */
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static int
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LWZReadByte_(gdIOCtx *fd, LZW_STATIC_DATA *sd, char flag, int input_code_size, int *ZeroDataBlockP)
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{
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int code, incode, i;
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if (flag) {
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sd->set_code_size = input_code_size;
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sd->code_size = sd->set_code_size+1;
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sd->clear_code = 1 << sd->set_code_size ;
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sd->end_code = sd->clear_code + 1;
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sd->max_code_size = 2*sd->clear_code;
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sd->max_code = sd->clear_code+2;
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GetCode(fd, &sd->scd, 0, TRUE, ZeroDataBlockP);
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sd->fresh = TRUE;
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for (i = 0; i < sd->clear_code; ++i) {
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sd->table[0][i] = 0;
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sd->table[1][i] = i;
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}
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for (; i < (1<<MAX_LWZ_BITS); ++i)
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sd->table[0][i] = sd->table[1][0] = 0;
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sd->sp = sd->stack;
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return 0;
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} else if (sd->fresh) {
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sd->fresh = FALSE;
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do {
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sd->firstcode = sd->oldcode =
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GetCode(fd, &sd->scd, sd->code_size, FALSE, ZeroDataBlockP);
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} while (sd->firstcode == sd->clear_code);
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return sd->firstcode;
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}
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if (sd->sp > sd->stack)
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return *--sd->sp;
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while ((code = GetCode(fd, &sd->scd, sd->code_size, FALSE, ZeroDataBlockP)) >= 0) {
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if (code == sd->clear_code) {
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for (i = 0; i < sd->clear_code; ++i) {
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sd->table[0][i] = 0;
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sd->table[1][i] = i;
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}
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for (; i < (1<<MAX_LWZ_BITS); ++i)
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sd->table[0][i] = sd->table[1][i] = 0;
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sd->code_size = sd->set_code_size+1;
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sd->max_code_size = 2*sd->clear_code;
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sd->max_code = sd->clear_code+2;
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sd->sp = sd->stack;
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sd->firstcode = sd->oldcode =
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GetCode(fd, &sd->scd, sd->code_size, FALSE, ZeroDataBlockP);
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return sd->firstcode;
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} else if (code == sd->end_code) {
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int count;
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unsigned char buf[260];
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if (*ZeroDataBlockP)
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return -2;
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while ((count = GetDataBlock(fd, buf, ZeroDataBlockP)) > 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 (sd->sp == (sd->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 >= sd->max_code) {
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*sd->sp++ = sd->firstcode;
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code = sd->oldcode;
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}
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while (code >= sd->clear_code) {
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if (sd->sp == (sd->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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*sd->sp++ = sd->table[1][code];
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if (code == sd->table[0][code]) {
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/* Oh well */
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}
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code = sd->table[0][code];
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}
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*sd->sp++ = sd->firstcode = sd->table[1][code];
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if ((code = sd->max_code) <(1<<MAX_LWZ_BITS)) {
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sd->table[0][code] = sd->oldcode;
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sd->table[1][code] = sd->firstcode;
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++sd->max_code;
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if ((sd->max_code >= sd->max_code_size) &&
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(sd->max_code_size < (1<<MAX_LWZ_BITS))) {
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sd->max_code_size *= 2;
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++sd->code_size;
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}
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}
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sd->oldcode = incode;
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if (sd->sp > sd->stack)
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return *--sd->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, LZW_STATIC_DATA *sd, char flag, int input_code_size, int *ZeroDataBlockP)
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{
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int rv;
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rv = LWZReadByte_(fd, sd, flag, input_code_size, ZeroDataBlockP);
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if (VERBOSE) printf("[LWZReadByte(,%d,%d) returning %d]\n",flag,input_code_size,rv);
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return(rv);
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}
|
|
/* }}} */
|
|
|
|
static void
|
|
ReadImage(gdImagePtr im, gdIOCtx *fd, int len, int height, unsigned char (*cmap)[256], int interlace, int *ZeroDataBlockP) /*1.4//, int ignore) */
|
|
{
|
|
unsigned char c;
|
|
int v;
|
|
int xpos = 0, ypos = 0, pass = 0;
|
|
int i;
|
|
LZW_STATIC_DATA sd;
|
|
|
|
|
|
/*
|
|
** Initialize the Compression routines
|
|
*/
|
|
if (! ReadOK(fd,&c,1)) {
|
|
return;
|
|
}
|
|
|
|
if (c > MAX_LWZ_BITS) {
|
|
return;
|
|
}
|
|
|
|
/* Stash the color map into the image */
|
|
for (i=0; (i<gdMaxColors); i++) {
|
|
im->red[i] = cmap[CM_RED][i];
|
|
im->green[i] = cmap[CM_GREEN][i];
|
|
im->blue[i] = cmap[CM_BLUE][i];
|
|
im->open[i] = 1;
|
|
}
|
|
/* Many (perhaps most) of these colors will remain marked open. */
|
|
im->colorsTotal = gdMaxColors;
|
|
if (LWZReadByte(fd, &sd, TRUE, c, ZeroDataBlockP) < 0) {
|
|
return;
|
|
}
|
|
|
|
/*
|
|
** If this is an "uninteresting picture" ignore it.
|
|
** REMOVED For 1.4
|
|
*/
|
|
/*if (ignore) { */
|
|
/* while (LWZReadByte(fd, &sd, FALSE, c) >= 0) */
|
|
/* ; */
|
|
/* return; */
|
|
/*} */
|
|
|
|
while ((v = LWZReadByte(fd, &sd, FALSE, c, ZeroDataBlockP)) >= 0) {
|
|
if (v >= gdMaxColors) {
|
|
v = 0;
|
|
}
|
|
/* This how we recognize which colors are actually used. */
|
|
if (im->open[v]) {
|
|
im->open[v] = 0;
|
|
}
|
|
gdImageSetPixel(im, xpos, ypos, v);
|
|
++xpos;
|
|
if (xpos == len) {
|
|
xpos = 0;
|
|
if (interlace) {
|
|
switch (pass) {
|
|
case 0:
|
|
case 1:
|
|
ypos += 8; break;
|
|
case 2:
|
|
ypos += 4; break;
|
|
case 3:
|
|
ypos += 2; break;
|
|
}
|
|
|
|
if (ypos >= height) {
|
|
++pass;
|
|
switch (pass) {
|
|
case 1:
|
|
ypos = 4; break;
|
|
case 2:
|
|
ypos = 2; break;
|
|
case 3:
|
|
ypos = 1; break;
|
|
default:
|
|
goto fini;
|
|
}
|
|
}
|
|
} else {
|
|
++ypos;
|
|
}
|
|
}
|
|
if (ypos >= height)
|
|
break;
|
|
}
|
|
|
|
fini:
|
|
if (LWZReadByte(fd, &sd, FALSE, c, ZeroDataBlockP) >=0) {
|
|
/* Ignore extra */
|
|
}
|
|
}
|
|
/* }}} */
|