PeerStreamer

/*

 *  Copyright (c) 2010 Luca Abeni

 *

 *  This is free software; see lgpl-2.1.txt

 */

#include <stdlib.h>

#include <stdint.h>

#include <limits.h>

#include <string.h>

#include <assert.h>

#include "chunkids_private.h"

#include "chunkidset.h"

#include "config.h"

#define DEFAULT_SIZE_INCREMENT 32

struct chunkID_set *chunkID_set_init(const char *config)

{

  struct chunkID_set *p;

  struct tag *cfg_tags;

  int res;

  const char *type;

  p = malloc(sizeof(struct chunkID_set));

  if (p == NULL) {

    return NULL;

  }

  p->n_elements = 0;

  cfg_tags = config_parse(config);

  res = config_value_int(cfg_tags, "size", &p->size);

  if (!res) {

    p->size = 0;

  }

  if (p->size) {

    p->elements = malloc(p->size * sizeof(int));

  } else {

    p->elements = NULL;

  }

  p->type = CIST_PRIORITY;

  type = config_value_str(cfg_tags, "type");

  if (type) {

    if (!memcmp(type, "priority", strlen(type) - 1)) {

      p->type = CIST_PRIORITY;

    } else if (!memcmp(type, "bitmap", strlen(type) - 1)) {

      p->type = CIST_BITMAP;

    } else {

      chunkID_set_free(p);

      free(cfg_tags);

      return NULL; 

    }

  }

  free(cfg_tags);

  assert(p->type == CIST_PRIORITY || p->type == CIST_BITMAP);

  return p;

}

int chunkID_set_add_chunk(struct chunkID_set *h, int chunk_id)

{

  if (chunkID_set_check(h, chunk_id) >= 0) {

    return 0;

  }

  if (h->n_elements == h->size) {

    int *res;

    res = realloc(h->elements, (h->size + DEFAULT_SIZE_INCREMENT) * sizeof(int));

    if (res == NULL) {

      return -1;

    }

    h->size += DEFAULT_SIZE_INCREMENT;

    h->elements = res;

  }

  h->elements[h->n_elements++] = chunk_id;

  return h->n_elements;

}

int chunkID_set_size(const struct chunkID_set *h)

{

  return h->n_elements;

}

int chunkID_set_get_chunk(const struct chunkID_set *h, int i)

{

  if (i < h->n_elements) {

    return h->elements[i];

  }

  return -1;

}

int chunkID_set_check(const struct chunkID_set *h, int chunk_id)

{

  int i;

  for (i = 0; i < h->n_elements; i++) {

    if (h->elements[i] == chunk_id) {

      return i;

    }

  }

  return -1;

}

int chunkID_set_get_earliest(const struct chunkID_set *h)

{

  int i, min;

  min = INT_MAX;

  for (i = 0; i < h->n_elements; i++) {

    min = (h->elements[i] < min) ? h->elements[i] : min;

  }

  return min;

}

int chunkID_set_get_latest(const struct chunkID_set *h)

{

  int i, max;

  max = INT_MIN;

  for (i = 0; i < h->n_elements; i++) {

    max = (h->elements[i] > max) ? h->elements[i] : max;

  }

  return max;

}

int chunkID_set_union(struct chunkID_set *h, struct chunkID_set *a)

{

  int i;

  for (i = 0; i < a->n_elements; i++) {

    int ret = chunkID_set_add_chunk(h,a->elements[i]);

    if (ret < 0) return ret;

  }

  return h->n_elements;

}

void chunkID_set_clear(struct chunkID_set *h, int size)

{

  h->n_elements = 0;

  h->size = size;

  h->elements = realloc(h->elements, size * sizeof(int));

  if (h->elements == NULL) {

    h->size = 0;

  }

}

void chunkID_set_free(struct chunkID_set *h)

{

  chunkID_set_clear(h,0);

  free(h->elements);

  free(h);

}