#ifndef __PNG_H__#define __PNG_H__#define PNGHEADER "\x89PNG\r\n\x1A\n"#define PNGHEADERSIZE 8typedef struct ChunkHeader{  LongWord length;  byte type[4];} ChunkHeader;typedef struct IHDR{  ChunkHeader chunk;  LongWord width;  LongWord height;  byte bitDepth;  byte colorType;  byte compressMethod;  byte filterMethod;  byte interlaceMethod;  LongWord crc;} IHDR;typedef struct IEND{  ChunkHeader chunk;  LongWord crc;       } IEND;typedef struct PngColor{  byte r;  byte g;  byte b;} PngColor;extern pascal long PngCrc(long crc, const char *data, int length);int writeIHDR(Word fd, Word height, Word width);int writeIEND(Word fd);int writeTEXT(int fd, const char *key, const char *value);int writePLTE(int fd, PngColor *p, word count);int writeIDAT(int fd, void *data, longword size);#endif