#pragma once

#include <stdio.h></stdio.h>

#include <stdlib.h></stdlib.h>

#include <string.h></string.h>

#define BLOCKROWS 3

#define NEXT2(x) (((x) + 1) & -2)  // uguale o successivo (pad)

#define NEXT4(x) (((x) + 3) & -4)  // uguale o successivo multiplo di 4	(pad)

#define FIXDPI(x) ((x) / 65536.)   // fixedpt

typedef long psdByte;

typedef unsigned short psdUint16;

typedef long psdPixel;

enum { RAWDATA, RLECOMP, ZIPWITHOUTPREDICTION, ZIPWITHPREDICTION };

struct TPSDChannelInfo {

  int id;                         // channel id

  int comptype;                   // channel's compression type

  psdPixel rows, cols, rowbytes;  // computed by dochannel()

  // FIXME: need depth??

  psdByte length;   // channel byte count in file

  psdByte filepos;  // file offset of channel data (AFTER compression type)

  psdByte *rowpos;  // row data file positions (RLE ONLY)

  unsigned char *unzipdata;  // uncompressed data (ZIP ONLY)

};

int unpackrow(unsigned char *out, unsigned char *in, psdPixel outlen,

              psdPixel inlen);

void readrow(FILE *psd, TPSDChannelInfo *chan, psdPixel rowIndex,

             unsigned char *inbuffer, unsigned char *outbuffer);

void skipBlock(FILE *f);

void *mymalloc(long n);

unsigned read2UBytes(FILE *f);

int read2Bytes(FILE *f);

long read4Bytes(FILE *f);

int psdUnzipWithoutPrediction(unsigned char *src_buf, int src_len,

                              unsigned char *dst_buf, int dst_len);

int psdUnzipWithPrediction(unsigned char *src_buf, int src_len,

                           unsigned char *dst_buf, int dst_len, int row_size,

                           int color_depth);