strings.c

/*
 * Copyright (c) 2014-2020 Pavel Kalvoda <[email protected]>
 *
 * libcbor is free software; you can redistribute it and/or modify
 * it under the terms of the MIT license. See LICENSE for details.
 */

#include "strings.h"
#include <string.h>
#include "internal/memory_utils.h"
#include "internal/unicode.h"

cbor_item_t *cbor_new_definite_string(void) {
  cbor_item_t *item = _cbor_malloc(sizeof(cbor_item_t));
  _CBOR_NOTNULL(item);
  *item = (cbor_item_t){
      .refcount = 1,
      .type = CBOR_TYPE_STRING,
      .metadata = {.string_metadata = {_CBOR_METADATA_DEFINITE, 0}}};
  return item;
}

cbor_item_t *cbor_new_indefinite_string(void) {
  cbor_item_t *item = _cbor_malloc(sizeof(cbor_item_t));
  _CBOR_NOTNULL(item);
  *item = (cbor_item_t){
      .refcount = 1,
      .type = CBOR_TYPE_STRING,
      .metadata = {.string_metadata = {.type = _CBOR_METADATA_INDEFINITE,
                                       .length = 0}},
      .data = _cbor_malloc(sizeof(struct cbor_indefinite_string_data))};
  _CBOR_DEPENDENT_NOTNULL(item, item->data);
  *((struct cbor_indefinite_string_data *)item->data) =
      (struct cbor_indefinite_string_data){
          .chunk_count = 0,
          .chunk_capacity = 0,
          .chunks = NULL,
      };
  return item;
}

cbor_item_t *cbor_build_string(const char *val) {
  cbor_item_t *item = cbor_new_definite_string();
  _CBOR_NOTNULL(item);
  size_t len = strlen(val);
  unsigned char *handle = _cbor_malloc(len);
  _CBOR_DEPENDENT_NOTNULL(item, handle);
  memcpy(handle, val, len);
  cbor_string_set_handle(item, handle, len);
  return item;
}

cbor_item_t *cbor_build_stringn(const char *val, size_t length) {
  cbor_item_t *item = cbor_new_definite_string();
  _CBOR_NOTNULL(item);
  unsigned char *handle = _cbor_malloc(length);
  _CBOR_DEPENDENT_NOTNULL(item, handle);
  memcpy(handle, val, length);
  cbor_string_set_handle(item, handle, length);
  return item;
}

void cbor_string_set_handle(cbor_item_t *item,
                            cbor_mutable_data CBOR_RESTRICT_POINTER data,
                            size_t length) {
  CBOR_ASSERT(cbor_isa_string(item));
  CBOR_ASSERT(cbor_string_is_definite(item));
  item->data = data;
  item->metadata.string_metadata.length = length;
  struct _cbor_unicode_status unicode_status;
  size_t codepoint_count =
      _cbor_unicode_codepoint_count(data, length, &unicode_status);
  CBOR_ASSERT(codepoint_count <= length);
  if (unicode_status.status == _CBOR_UNICODE_OK) {
    item->metadata.string_metadata.codepoint_count = codepoint_count;
  } else {
    item->metadata.string_metadata.codepoint_count = 0;
  }
}

cbor_item_t **cbor_string_chunks_handle(const cbor_item_t *item) {
  CBOR_ASSERT(cbor_isa_string(item));
  CBOR_ASSERT(cbor_string_is_indefinite(item));
  return ((struct cbor_indefinite_string_data *)item->data)->chunks;
}

size_t cbor_string_chunk_count(const cbor_item_t *item) {
  CBOR_ASSERT(cbor_isa_string(item));
  CBOR_ASSERT(cbor_string_is_indefinite(item));
  return ((struct cbor_indefinite_string_data *)item->data)->chunk_count;
}

bool cbor_string_add_chunk(cbor_item_t *item, cbor_item_t *chunk) {
  CBOR_ASSERT(cbor_isa_string(item));
  CBOR_ASSERT(cbor_string_is_indefinite(item));
  struct cbor_indefinite_string_data *data =
      (struct cbor_indefinite_string_data *)item->data;
  if (data->chunk_count == data->chunk_capacity) {
    if (!_cbor_safe_to_multiply(CBOR_BUFFER_GROWTH, data->chunk_capacity)) {
      return false;
    }

    size_t new_chunk_capacity =
        data->chunk_capacity == 0 ? 1
                                  : CBOR_BUFFER_GROWTH * (data->chunk_capacity);
    cbor_item_t **new_chunks_data = _cbor_realloc_multiple(
        data->chunks, sizeof(cbor_item_t *), new_chunk_capacity);

    if (new_chunks_data == NULL) {
      return false;
    }

    data->chunk_capacity = new_chunk_capacity;
    data->chunks = new_chunks_data;
  }
  data->chunks[data->chunk_count++] = cbor_incref(chunk);
  return true;
}

size_t cbor_string_length(const cbor_item_t *item) {
  CBOR_ASSERT(cbor_isa_string(item));
  return item->metadata.string_metadata.length;
}

unsigned char *cbor_string_handle(const cbor_item_t *item) {
  CBOR_ASSERT(cbor_isa_string(item));
  return item->data;
}

size_t cbor_string_codepoint_count(const cbor_item_t *item) {
  CBOR_ASSERT(cbor_isa_string(item));
  return item->metadata.string_metadata.codepoint_count;
}

bool cbor_string_is_definite(const cbor_item_t *item) {
  CBOR_ASSERT(cbor_isa_string(item));
  return item->metadata.string_metadata.type == _CBOR_METADATA_DEFINITE;
}

bool cbor_string_is_indefinite(const cbor_item_t *item) {
  return !cbor_string_is_definite(item);
}