#ifndef __PNG_H__
#define __PNG_H__

#define PNGHEADER "\x89PNG\r\n\x1A\n"
#define PNGHEADERSIZE 8


typedef 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