#include "uzlib.h"
#include "zones.gz.h"

#define OUT_CHUNK_SIZE 512

void gunzip () {
  uzlib_init();

  uint32_t outlen = 0;
  for (uint x = 4; x>0; x--) 
    outlen += zones_gz[zones_gz_len-x] << (4-x)*8;

  struct uzlib_uncomp d;
  void* dict_ring = (void*)malloc(32768);
  uzlib_uncompress_init(&d, dict_ring, 32768);

  d.source = zones_gz;
  d.source_limit = zones_gz + zones_gz_len - 4;
  d.source_read_cb = NULL;

  int res = uzlib_gzip_parse_header(&d);
  if (res != TINF_OK) {
      Serial.printf("Error parsing header: %d\n", res);
      return;
  }

  unsigned char* dest = (unsigned char*)malloc(OUT_CHUNK_SIZE);
  d.dest_start = dest;
  
  uint32_t dlen = outlen + 1;
  while (dlen) {
      unsigned int chunk_len = dlen < OUT_CHUNK_SIZE ? dlen : OUT_CHUNK_SIZE;
      d.dest = d.dest_start;                
      d.dest_limit = d.dest + chunk_len;
      res = uzlib_uncompress_chksum(&d);
      dlen -= chunk_len;
      //Serial.write(dest, chunk_len);
      if (res != TINF_OK) {
          break;
      }
  }
  free(dest);
  if (res == TINF_DONE) {
    Serial.println("decompressed!");
  } else {
    Serial.printf("unzip failed: %d\n", res);
  }
  free(dict_ring);

}

void setup() {
  Serial.begin(115200);
  unsigned long start = millis();
  gunzip();
  Serial.printf("time to decompress: %lu\n", millis()-start);
}

void loop() {
  delay(-1);
}