#include "tccboot.h"

/*
 * gzip declarations
 */

#define OF(args)  args
#define STATIC static

#define memzero(s, n)     memset ((s), 0, (n))

typedef unsigned char  uch;
typedef unsigned short ush;
typedef unsigned long  ulg;

#define WSIZE 0x8000		/* Window size must be at least 32k, */
				/* and a power of two */

static uch *inbuf;	     /* input buffer */
static uch window[WSIZE];    /* Sliding window buffer */

static unsigned insize = 0;  /* valid bytes in inbuf */
static unsigned inptr = 0;   /* index of next byte to be processed in inbuf */
static unsigned outcnt = 0;  /* bytes in output buffer */

/* gzip flag byte */
#define ASCII_FLAG   0x01 /* bit 0 set: file probably ASCII text */
#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
#define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
#define ORIG_NAME    0x08 /* bit 3 set: original file name present */
#define COMMENT      0x10 /* bit 4 set: file comment present */
#define ENCRYPTED    0x20 /* bit 5 set: file is encrypted */
#define RESERVED     0xC0 /* bit 6,7:   reserved */

#define get_byte()  (inptr < insize ? inbuf[inptr++] : fill_inbuf())
		
/* Diagnostic functions */
#ifdef DEBUG
#  define Assert(cond,msg) {if(!(cond)) error(msg);}
#  define Trace(x) fprintf x
#  define Tracev(x) {if (verbose) fprintf x ;}
#  define Tracevv(x) {if (verbose>1) fprintf x ;}
#  define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
#  define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
#else
#  define Assert(cond,msg)
#  define Trace(x)
#  define Tracev(x)
#  define Tracevv(x)
#  define Tracec(c,x)
#  define Tracecv(c,x)
#endif

static int  fill_inbuf(void);
static void flush_window(void);
static void error(char *m);

static void gzip_mark(void **ptr)
{
}
static void gzip_release(void **ptr)
{
}
  
static long bytes_out;
static uch *output_data;
static const uint8_t *input_data;
static int input_len;

#include "inflate.c"

/* ===========================================================================
 * Fill the input buffer. This is called only when the buffer is empty
 * and at least one byte is really needed.
 */
static int fill_inbuf(void)
{
	if (insize != 0) {
		error("ran out of input data\n");
	}

	inbuf = (uint8_t *)input_data;
	insize = input_len;
	inptr = 1;
	return inbuf[0];
}

static void flush_window(void)
{
    memcpy(output_data, window, outcnt);
    output_data += outcnt;
    bytes_out += outcnt;
    outcnt = 0;
}

static void error(char *x)
{
    fatal("%s", x);
}

int do_gunzip(uint8_t *dest, const uint8_t *src, int src_len)
{
    input_data = src;
    input_len = src_len;
    output_data = dest;
    bytes_out = 0;
    gunzip();
    return bytes_out;
}