bytestrings.c

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/*
 * Copyright (c) 2014-2017 Pavel Kalvoda <me@pavelkalvoda.com>
 *
 * libcbor is free software; you can redistribute it and/or modify
 * it under the terms of the MIT license. See LICENSE for details.
 */

#include <string.h>
#include "bytestrings.h"
#include "internal/memory_utils.h"

size_t cbor_bytestring_length(const cbor_item_t *item)
{
    assert(cbor_isa_bytestring(item));
    return item->metadata.bytestring_metadata.length;
}

unsigned char *cbor_bytestring_handle(const cbor_item_t *item)
{
    assert(cbor_isa_bytestring(item));
    return item->data;
}

bool cbor_bytestring_is_definite(const cbor_item_t *item)
{
    assert(cbor_isa_bytestring(item));
    return item->metadata.bytestring_metadata.type == _CBOR_METADATA_DEFINITE;
}

bool cbor_bytestring_is_indefinite(const cbor_item_t *item)
{
    return !cbor_bytestring_is_definite(item);
}

cbor_item_t *cbor_new_definite_bytestring()
{
    cbor_item_t *item = _CBOR_MALLOC(sizeof(cbor_item_t));
    *item = (cbor_item_t) {
        .refcount = 1,
        .type = CBOR_TYPE_BYTESTRING,
        .metadata = {.bytestring_metadata = {_CBOR_METADATA_DEFINITE, 0}}
    };
    return item;
}

cbor_item_t *cbor_new_indefinite_bytestring()
{
    cbor_item_t *item = _CBOR_MALLOC(sizeof(cbor_item_t));
    *item = (cbor_item_t) {
        .refcount = 1,
        .type = CBOR_TYPE_BYTESTRING,
        .metadata = {.bytestring_metadata = {.type = _CBOR_METADATA_INDEFINITE, .length = 0}},
        .data = _CBOR_MALLOC(sizeof(struct cbor_indefinite_string_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_bytestring(cbor_data handle, size_t length)
{
    cbor_item_t *res = cbor_new_definite_bytestring();
    void * content = _CBOR_MALLOC(length);
    memcpy(content, handle, length);
    cbor_bytestring_set_handle(res, content, length);
    return res;
}

void cbor_bytestring_set_handle(cbor_item_t *item, cbor_mutable_data CBOR_RESTRICT_POINTER data, size_t length)
{
    assert(cbor_isa_bytestring(item));
    assert(cbor_bytestring_is_definite(item));
    item->data = data;
    item->metadata.bytestring_metadata.length = length;
}

cbor_item_t **cbor_bytestring_chunks_handle(const cbor_item_t *item)
{
    assert(cbor_isa_bytestring(item));
    assert(cbor_bytestring_is_indefinite(item));
    return ((struct cbor_indefinite_string_data *) item->data)->chunks;
}

size_t cbor_bytestring_chunk_count(const cbor_item_t *item)
{
    assert(cbor_isa_bytestring(item));
    assert(cbor_bytestring_is_indefinite(item));
    return ((struct cbor_indefinite_string_data *) item->data)->chunk_count;

}

bool cbor_bytestring_add_chunk(cbor_item_t *item, cbor_item_t *chunk)
{
    assert(cbor_isa_bytestring(item));
    assert(cbor_bytestring_is_indefinite(item));
    struct cbor_indefinite_string_data *data = (struct cbor_indefinite_string_data *) item->data;
    if (data->chunk_count == data->chunk_capacity) {
        /* We need more space */
        if (!_cbor_safe_to_multiply(CBOR_BUFFER_GROWTH, data->chunk_capacity)) {
            return false;
        }

        data->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 *), data->chunk_capacity);

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

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