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bsonmex.c
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/** mxArray BSON encoder implementation.
*
* TODO: Implement sparse array conversion.
*
* Kota Yamaguchi 2013
*/
#include "bsonmex.h"
#include <ctype.h>
#include <mex.h>
#include <stdlib.h>
#include <string.h>
static bool ConvertArrayToBSON(const mxArray* input,
const char* name,
bson_t* output);
static mxArray* ConvertNextToMxArray(bson_iter_t* it);
static mxArray* Convert2DOrNDArrayToCellArray(const mxArray* input);
/** Convert mxArray to BSON binary.
*/
static bool ConvertBinaryArrayToBSON(const mxArray* input,
const char* name,
bson_t* output) {
size_t num_elements = mxGetNumberOfElements(input);
int length = 0;
const uint8_t* data;
if (num_elements == 0)
return BSON_APPEND_NULL(output, (name) ? name : "0");
data = (const uint8_t*)mxGetData(input);
length = mxGetNumberOfElements(input);
return BSON_APPEND_BINARY(output,
(name) ? name : "0",
BSON_SUBTYPE_BINARY,
data,
length);
}
/** Convert mxArray to BSON int array.
*/
static bool ConvertShortArrayToBSON(const mxArray* input,
const char* name,
bson_t* output) {
char key[16];
size_t num_elements = mxGetNumberOfElements(input);
int16_t* values = (int16_t*)mxGetData(input);
bson_t array;
int i;
if (num_elements == 0)
return BSON_APPEND_NULL(output, (name) ? name : "0");
if (num_elements == 1)
return BSON_APPEND_INT32(output, (name) ? name : "0", values[0]) ==
true;
if (name && !bson_append_array_begin(output,
name,
(int)strlen(name),
&array))
return false;
for (i = 0; i < num_elements; ++i) {
if (sprintf(key, "%d", i) < 0)
return false;
if (!BSON_APPEND_INT32((name) ? &array : output, key, values[i]))
return false;
}
if (name && !bson_append_array_end(output, &array))
return false;
return true;
}
/** Convert mxArray to BSON int array.
*/
static bool ConvertIntegerArrayToBSON(const mxArray* input,
const char* name,
bson_t* output) {
char key[16];
size_t num_elements = mxGetNumberOfElements(input);
int32_t* values = (int32_t*)mxGetData(input);
bson_t array;
int i;
if (num_elements == 0)
return BSON_APPEND_NULL(output, (name) ? name : "0");
if (num_elements == 1)
return BSON_APPEND_INT32(output, (name) ? name : "0", values[0]) ==
true;
if (name && !bson_append_array_begin(output,
name,
(int)strlen(name),
&array))
return false;
for (i = 0; i < num_elements; ++i) {
if (sprintf(key, "%d", i) < 0)
return false;
if (!BSON_APPEND_INT32((name) ? &array : output, key, values[i]))
return false;
}
if (name && !bson_append_array_end(output, &array))
return false;
return true;
}
/** Convert mxArray to BSON long array.
*/
static bool ConvertLongArrayToBSON(const mxArray* input,
const char* name,
bson_t* output) {
char key[16];
size_t num_elements = mxGetNumberOfElements(input);
int64_t* values = (int64_t*)mxGetData(input);
bson_t array;
int i;
if (num_elements == 0)
return BSON_APPEND_NULL(output, (name) ? name : "0");
if (num_elements == 1)
return BSON_APPEND_INT64(output, (name) ? name : "0", values[0]) ==
true;
if (name && !bson_append_array_begin(output,
name,
(int)strlen(name),
&array))
return false;
for (i = 0; i < num_elements; ++i) {
if (sprintf(key, "%d", i) < 0)
return false;
if (!BSON_APPEND_INT64((name) ? &array : output, key, values[i]))
return false;
}
if (name && !bson_append_array_end(output, &array))
return false;
return true;
}
/** Convert mxArray to BSON bool array.
*/
static bool ConvertLogicalArrayToBSON(const mxArray* input,
const char* name,
bson_t* output) {
char key[16];
size_t num_elements = mxGetNumberOfElements(input);
mxLogical* values = mxGetLogicals(input);
bson_t array;
int i;
if (num_elements == 0)
return BSON_APPEND_NULL(output, (name) ? name : "0");
if (num_elements == 1)
return BSON_APPEND_BOOL(output, (name) ? name : "0", values[0]) ==
true;
if (name && !bson_append_array_begin(output,
name,
(int)strlen(name),
&array))
return false;
for (i = 0; i < num_elements; ++i) {
if (sprintf(key, "%d", i) < 0)
return false;
if (!BSON_APPEND_BOOL((name) ? &array : output, key, values[i]))
return false;
}
if (name && !bson_append_array_end(output, &array))
return false;
return true;
}
/** Convert mxArray to BSON string.
*/
static bool ConvertCharArrayToBSON(const mxArray* input,
const char* name,
bson_t* output) {
mxArray* prhs[] = {(mxArray*)input, mxCreateString("UTF-8")};
mxArray* converted_input = NULL;
size_t length;
char* value;
bool status;
mexCallMATLAB(1, &converted_input, 2, prhs, "unicode2native");
length = mxGetNumberOfElements(converted_input);
value = (char*)mxGetData(converted_input);
if (length && !value)
return false;
status = bson_append_utf8(output,
(name) ? name : "0",
(int)strlen((name) ? name : "0"),
value,
length);
mxDestroyArray(prhs[1]);
mxDestroyArray(converted_input);
return status;
}
/** Convert mxArray to BSON double array.
*/
static bool ConvertFloatArrayToBSON(const mxArray* input,
const char* name,
bson_t* output) {
char key[16];
size_t num_elements = mxGetNumberOfElements(input);
float* values = (float*)mxGetData(input);
bson_t array;
int i;
if (num_elements == 0)
return BSON_APPEND_NULL(output, (name) ? name : "0");
if (num_elements == 1)
return BSON_APPEND_DOUBLE(output, (name) ? name : "0", values[0]) ==
true;
if (name && !bson_append_array_begin(output,
name,
(int)strlen(name),
&array))
return false;
for (i = 0; i < num_elements; ++i) {
if (sprintf(key, "%d", i) < 0)
return false;
if (!BSON_APPEND_DOUBLE((name) ? &array : output, key, values[i]))
return false;
}
if (name && !bson_append_array_end(output, &array))
return false;
return true;
}
/** Convert mxArray to BSON double array.
*/
static bool ConvertDoubleArrayToBSON(const mxArray* input,
const char* name,
bson_t* output) {
char key[16];
size_t num_elements = mxGetNumberOfElements(input);
double* values = mxGetPr(input);
bson_t array;
int i;
if (num_elements == 0)
return BSON_APPEND_NULL(output, (name) ? name : "0");
if (num_elements == 1)
return BSON_APPEND_DOUBLE(output, (name) ? name : "0", values[0]) ==
true;
if (name && !bson_append_array_begin(output,
name,
(int)strlen(name),
&array))
return false;
for (i = 0; i < num_elements; ++i) {
if (sprintf(key, "%d", i) < 0)
return false;
if (!BSON_APPEND_DOUBLE((name) ? &array : output, key, values[i]))
return false;
}
if (name && !bson_append_array_end(output, &array))
return false;
return true;
}
/** Convert mxArray to BSON date array.
*/
static bool ConvertDateArrayToBSON(const mxArray* input,
const char* name,
bson_t* output) {
char key[16];
size_t num_elements = mxGetNumberOfElements(input);
bson_t array;
int i;
if (num_elements == 0)
return BSON_APPEND_NULL(output, (name) ? name : "0");
if (num_elements == 1) {
mxArray* value = mxGetProperty(input, 0, "number");
int64_t date_value;
if (!value)
return false;
date_value = (int64_t)((mxGetScalar(value) - 719529) * 86400);
return BSON_APPEND_DATE_TIME(output, (name) ? name : "0", date_value) ==
true;
}
if (name && !bson_append_array_begin(output,
name,
(int)strlen(name),
&array))
return false;
for (i = 0; i < num_elements; ++i) {
mxArray* value;
int64_t date_value;
if (sprintf(key, "%d", i) < 0)
return false;
value = mxGetProperty(input, i, "number");
if (!value)
return false;
date_value = (int64_t)((mxGetScalar(value) - 719529) * 86400);
if (!BSON_APPEND_DATE_TIME((name) ? &array : output,
key,
date_value))
return false;
}
if (name && !bson_append_array_end(output, &array))
return false;
return true;
}
/** Convert cell mxArray to BSON array.
*/
static bool ConvertCellArrayToBSON(const mxArray* input,
const char* name,
bson_t* output) {
char key[16];
size_t num_elements = mxGetNumberOfElements(input);
bson_t array;
int i;
if (name && !bson_append_array_begin(output,
name,
(int)strlen(name),
&array))
return false;
for (i = 0; i < num_elements; ++i) {
mxArray* element = mxGetCell(input, i);
if (sprintf(key, "%d", i) < 0)
return false;
if (!ConvertArrayToBSON(element, key, (name) ? &array : output))
return false;
}
if (name && !bson_append_array_end(output, &array))
return false;
return true;
}
/** Check if oid is given.
*/
static bool ConvertStringToOID(const mxArray* element,
bson_t* output) {
char* value = mxArrayToString(element);
bson_oid_t oid;
bson_oid_init_from_string(&oid, value);
mxFree(value);
return BSON_APPEND_OID(output, "_id", &oid);
}
/** Convert struct mxArray to BSON array.
*/
static bool ConvertStructArrayToBSON(const mxArray* input,
const char* name,
bson_t* output) {
size_t num_elements = mxGetNumberOfElements(input);
int num_fields = mxGetNumberOfFields(input);
bson_t array;
int i, j;
if (num_elements == 1) {
bson_t document;
if (name && !bson_append_document_begin(output,
name,
(int)strlen(name),
&document))
return false;
for (i = 0; i < num_fields; ++i) {
mxArray* element = mxGetFieldByNumber(input, 0, i);
const char* field_name = mxGetFieldNameByNumber(input, i);
/* Convert string to OID only if a scalar struct with id field. */
if (name == NULL &&
strcmp(field_name, "id_") == 0 &&
mxIsChar(element) &&
mxGetNumberOfElements(element) == 12) {
if (!ConvertStringToOID(element, (name) ? &document : output))
return false;
}
else
if (!ConvertArrayToBSON(element,
field_name,
(name) ? &document : output))
return false;
}
if (name && !bson_append_document_end(output, &document))
return false;
}
else {
char key[16];
if (name && !bson_append_array_begin(output,
name,
(int)strlen(name),
&array))
return false;
for (j = 0; j < num_elements; ++j) {
bson_t document;
if (sprintf(key, "%d", j) < 0)
return false;
if (!bson_append_document_begin((name) ? &array : output,
key,
(int)strlen(key),
&document))
return false;
for (i = 0; i < num_fields; ++i) {
mxArray* element = mxGetFieldByNumber(input, 0, i);
const char* field_name = mxGetFieldNameByNumber(input, i);
if (!ConvertArrayToBSON(element, field_name, &document))
return false;
}
if (!bson_append_document_end((name) ? &array : output,
&document))
return false;
}
if (name && !bson_append_array_end(output, &array))
return false;
}
return true;
}
/** Convert any ND (>2D) array to a nested cell array.
*/
static mxArray* ConvertNDArrayToCellArray(const mxArray* input,
mwSize ndims,
const mwSize* dims) {
mwSize last_dimentions = dims[ndims - 1];
mxArray* array = mxCreateCellMatrix(1, last_dimentions);
mwSize num_elements = mxGetNumberOfElements(input) / last_dimentions;
int i, j;
for (i = 0; i < last_dimentions; ++i) {
mxArray* element = NULL;
mxArray* split_element;
switch (mxGetClassID(input)) {
case mxSTRUCT_CLASS: {
int nfields = mxGetNumberOfFields(input);
const char** fields = (const char**)mxMalloc(
sizeof(const char*) * nfields);
int k;
for (k = 0; k < nfields; ++k)
fields[k] = mxGetFieldNameByNumber(input, k);
element = mxCreateStructArray(ndims - 1, dims, nfields, fields);
for (j = 0; j < num_elements; ++j) {
mwSize index = j + i * num_elements;
for (k = 0; k < nfields; ++k) {
mxArray* value = mxDuplicateArray(mxGetFieldByNumber(input,
index,
k));
mxSetFieldByNumber(element, j, k, value);
}
}
mxFree(fields);
break;
}
case mxCELL_CLASS: {
element = mxCreateCellArray(ndims - 1, dims);
for (j = 0; j < num_elements; ++j) {
mwSize index = j + num_elements * i;
mxSetCell(element, j, mxDuplicateArray(mxGetCell(input, index)));
}
break;
}
case mxDOUBLE_CLASS:
case mxINT8_CLASS:
case mxUINT8_CLASS:
case mxINT16_CLASS:
case mxUINT16_CLASS:
case mxINT32_CLASS:
case mxUINT32_CLASS:
case mxINT64_CLASS:
case mxUINT64_CLASS:
case mxSINGLE_CLASS: {
mwSize element_size, stride;
element = mxCreateNumericArray(ndims - 1,
dims,
mxGetClassID(input),
mxREAL);
element_size = mxGetElementSize(input);
stride = element_size * num_elements;
memcpy((void*)mxGetData(element),
(void*)mxGetData(input) + i * stride,
stride);
break;
}
case mxCHAR_CLASS: {
mwSize element_size, stride;
element = mxCreateCharArray(ndims - 1, dims);
element_size = mxGetElementSize(input);
stride = element_size * num_elements;
memcpy((void*)mxGetData(element),
(void*)mxGetData(input) + i * stride,
stride);
break;
}
case mxLOGICAL_CLASS: {
mwSize element_size, stride;
element = mxCreateLogicalArray(ndims - 1, dims);
element_size = mxGetElementSize(input);
stride = element_size * num_elements;
memcpy((void*)mxGetData(element),
(void*)mxGetData(input) + i * stride,
stride);
break;
}
case mxOBJECT_CLASS:
case mxVOID_CLASS:
case mxFUNCTION_CLASS:
case mxOPAQUE_CLASS:
default:
return NULL;
}
if (!element)
return NULL;
split_element = Convert2DOrNDArrayToCellArray(element);
if (!split_element)
return NULL;
if (split_element != element)
mxDestroyArray(element);
mxSetCell(array, i, split_element);
}
return array;
}
/** Convert any 2D array to a cell array of row vectors.
*/
static mxArray* Convert2DArrayToCellArray(const mxArray* input,
mwSize ndims,
const mwSize* dims) {
mxArray* array = mxCreateCellMatrix(1, dims[0]);
int i, j;
for (i = 0; i < dims[0]; ++i) {
mxArray* element = NULL;
switch (mxGetClassID(input)) {
case mxSTRUCT_CLASS: {
int nfields = mxGetNumberOfFields(input);
const char** fields = (const char**)mxMalloc(
sizeof(const char*) * nfields);
int k;
for (k = 0; k < nfields; ++k)
fields[k] = mxGetFieldNameByNumber(input, k);
element = mxCreateStructMatrix(1, dims[1], nfields, fields);
for (j = 0; j < dims[1]; ++j) {
mwSize index = i + j * dims[0];
for (k = 0; k < nfields; ++k) {
mxArray* value = mxDuplicateArray(mxGetFieldByNumber(input,
index,
k));
mxSetFieldByNumber(element, j, k, value);
}
}
mxFree(fields);
break;
}
case mxCELL_CLASS: {
element = mxCreateCellMatrix(1, dims[1]);
for (j = 0; j < dims[1]; ++j) {
mwSize index = i + j * dims[0];
mxSetCell(element, j, mxDuplicateArray(mxGetCell(input, index)));
}
break;
}
case mxDOUBLE_CLASS:
case mxINT8_CLASS:
case mxUINT8_CLASS:
case mxINT16_CLASS:
case mxUINT16_CLASS:
case mxINT32_CLASS:
case mxUINT32_CLASS:
case mxINT64_CLASS:
case mxUINT64_CLASS:
case mxSINGLE_CLASS: {
mwSize element_size, stride;
void* input_data;
void* output_data;
element = mxCreateNumericMatrix(1,
dims[1],
mxGetClassID(input),
mxREAL);
element_size = mxGetElementSize(input);
stride = element_size * dims[0];
input_data = (void*)mxGetData(input) + i * element_size;
output_data = (void*)mxGetData(element);
for (j = 0; j < dims[1]; ++j) {
memcpy(output_data, input_data, element_size);
input_data += stride;
output_data += element_size;
}
break;
}
case mxCHAR_CLASS: {
mwSize char_dims[] = {1, dims[1]};
mwSize element_size, stride;
void* input_data;
void* output_data;
element = mxCreateCharArray(2, char_dims);
element_size = mxGetElementSize(input);
stride = element_size * dims[0];
input_data = (void*)mxGetData(input) + i * element_size;
output_data = (void*)mxGetData(element);
for (j = 0; j < dims[1]; ++j) {
memcpy(output_data, input_data, element_size);
input_data += stride;
output_data += element_size;
}
break;
}
case mxLOGICAL_CLASS: {
mwSize element_size, stride;
void* input_data;
void* output_data;
element = mxCreateLogicalMatrix(1, dims[1]);
element_size = mxGetElementSize(input);
stride = element_size * dims[0];
input_data = (void*)mxGetData(input) + i * element_size;
output_data = (void*)mxGetData(element);
for (j = 0; j < dims[1]; ++j) {
memcpy(output_data, input_data, element_size);
input_data += stride;
output_data += element_size;
}
break;
}
case mxOBJECT_CLASS:
case mxVOID_CLASS:
case mxFUNCTION_CLASS:
case mxOPAQUE_CLASS:
default:
return NULL;
}
if (!element)
return NULL;
mxSetCell(array, i, element);
}
return array;
}
/** Convert any 2D or ND array to a nested cell array.
*/
static mxArray* Convert2DOrNDArrayToCellArray(const mxArray* input) {
mwSize ndims = mxGetNumberOfDimensions(input);
const mwSize* dims = mxGetDimensions(input);
if (ndims <= 2 && (dims[0] <= 1 || dims[1] <= 1)) {
return (mxArray*)input;
}
else if (ndims == 2)
return Convert2DArrayToCellArray(input, ndims, dims);
else
return ConvertNDArrayToCellArray(input, ndims, dims);
}
/** Convert any mxArray to BSON.
*/
static bool ConvertArrayToBSON(const mxArray* input,
const char* name,
bson_t* output) {
mxArray* array = Convert2DOrNDArrayToCellArray(input);
if (!array)
return false;
switch (mxGetClassID(array)) {
case mxDOUBLE_CLASS:
return ConvertDoubleArrayToBSON(array, name, output);
break;
case mxSTRUCT_CLASS:
return ConvertStructArrayToBSON(array, name, output);
break;
case mxCELL_CLASS:
return ConvertCellArrayToBSON(array, name, output);
break;
case mxLOGICAL_CLASS:
return ConvertLogicalArrayToBSON(array, name, output);
break;
case mxCHAR_CLASS:
return ConvertCharArrayToBSON(array, name, output);
break;
case mxINT8_CLASS:
case mxUINT8_CLASS:
return ConvertBinaryArrayToBSON(array, name, output);
break;
case mxINT16_CLASS:
case mxUINT16_CLASS:
return ConvertShortArrayToBSON(array, name, output);
break;
case mxINT32_CLASS:
case mxUINT32_CLASS:
return ConvertIntegerArrayToBSON(array, name, output);
break;
case mxINT64_CLASS:
case mxUINT64_CLASS:
return ConvertLongArrayToBSON(array, name, output);
break;
case mxSINGLE_CLASS:
return ConvertFloatArrayToBSON(array, name, output);
break;
case mxOBJECT_CLASS:
case mxVOID_CLASS:
case mxFUNCTION_CLASS:
case mxOPAQUE_CLASS:
default:
if (mxIsClass(input, "bson.datetime")) {
return ConvertDateArrayToBSON(array, name, output);
break;
}
return false;
}
if (array != input)
mxDestroyArray(array);
return false;
}
/** Check the type and the size of the BSON object.
*/
static void CheckBSONObject(bson_iter_t* it,
int* object_size,
const char*** keys,
int* array_type) {
int element_type;
bool is_first = true;
bool is_array = true;
*object_size = 0;
while (bson_iter_next(it)) {
bson_type_t type = bson_iter_type(it);
const char* key;
const char* key_ptr;
bool is_digit;
if (type == BSON_TYPE_EOD)
break;
key = bson_iter_key(it);
(*object_size)++;
/* Keep key names for a struct array. */
if (keys) {
*keys = (const char**)mxRealloc(*keys,
*object_size * sizeof(const char*));
(*keys)[(*object_size) - 1] = key;
}
/* Check if it has an consistent index. */
key_ptr = key;
is_digit = true;
while (*key_ptr != 0)
is_digit &= (isdigit(*key_ptr++) > 0);
is_array = (is_digit) ? is_array & (*object_size - 1 == atol(key)) : false;
/* Check the array type from element. */
if (array_type) {
switch (type) {
case BSON_TYPE_DOUBLE:
element_type = mxDOUBLE_CLASS;
break;
case BSON_TYPE_INT32:
element_type = mxINT32_CLASS;
break;
case BSON_TYPE_INT64:
element_type = mxINT64_CLASS;
break;
case BSON_TYPE_BOOL:
element_type = mxLOGICAL_CLASS;
break;
case BSON_TYPE_UTF8:
element_type = mxCHAR_CLASS;
break;
case BSON_TYPE_BINARY:
element_type = mxUINT8_CLASS;
break;
default:
element_type = mxCELL_CLASS;
break;
}
if (is_first) {
*array_type = element_type;
is_first = false;
}
else
*array_type = (*array_type == element_type) ?
element_type : mxCELL_CLASS;
}
}
if (array_type && !is_array)
*array_type = mxSTRUCT_CLASS;
}
/** Convert BSON array to double mxArray.
*/
static mxArray* ConvertBSONArrayToDoubleArray(bson_iter_t* it, int size) {
mxArray* element = mxCreateDoubleMatrix(1, size, mxREAL);
double* output_data;
if (!element)
return NULL;
output_data = mxGetPr(element);
while (bson_iter_next(it)) {
bson_type_t type = bson_iter_type(it);
switch (type) {
case BSON_TYPE_EOD:
break;
case BSON_TYPE_DOUBLE:
*(output_data++) = bson_iter_double(it);
break;
case BSON_TYPE_INT32:
*(output_data++) = bson_iter_int32(it);
break;
case BSON_TYPE_INT64:
*(output_data++) = bson_iter_int64(it);
break;
case BSON_TYPE_BOOL:
*(output_data++) = bson_iter_bool(it);
break;
default:
mxDestroyArray(element);
return NULL;
}
}
return element;
}
/** Convert BSON array to integer mxArray.
*/
static mxArray* ConvertBSONArrayToIntegerArray(bson_iter_t* it, int size) {
mxArray* element = mxCreateNumericMatrix(1, size, mxINT32_CLASS, mxREAL);
int32_t* output_data;
if (!element)
return NULL;
output_data = (int32_t*)mxGetData(element);
while (bson_iter_next(it)) {
bson_type_t type = bson_iter_type(it);
switch (type) {
case BSON_TYPE_EOD:
break;
case BSON_TYPE_DOUBLE:
*(output_data++) = bson_iter_double(it);
break;
case BSON_TYPE_INT32:
*(output_data++) = bson_iter_int32(it);
break;
case BSON_TYPE_INT64:
*(output_data++) = bson_iter_int64(it);
break;
case BSON_TYPE_BOOL:
*(output_data++) = bson_iter_bool(it);
break;
default:
mxDestroyArray(element);
return NULL;
}
}
return element;
}
/** Convert BSON array to long mxArray.
*/
static mxArray* ConvertBSONArrayToLongArray(bson_iter_t* it, int size) {
mxArray* element = mxCreateNumericMatrix(1, size, mxINT64_CLASS, mxREAL);
int64_t* output_data;
if (!element)
return NULL;
output_data = (int64_t*)mxGetData(element);
while (bson_iter_next(it)) {
bson_type_t type = bson_iter_type(it);
switch (type) {
case BSON_TYPE_EOD:
break;
case BSON_TYPE_DOUBLE:
*(output_data++) = bson_iter_double(it);
break;
case BSON_TYPE_INT32:
*(output_data++) = bson_iter_int32(it);
break;
case BSON_TYPE_INT64:
*(output_data++) = bson_iter_int64(it);
break;
case BSON_TYPE_BOOL:
*(output_data++) = bson_iter_bool(it);
break;
default:
mxDestroyArray(element);
return NULL;
}
}
return element;
}
/** Convert BSON array to logical mxArray.
*/
static mxArray* ConvertBSONArrayToLogicalArray(bson_iter_t* it, int size) {
mxArray* element = mxCreateLogicalMatrix(1, size);
mxLogical* output_data;
if (!element)
return NULL;
output_data = mxGetLogicals(element);
while (bson_iter_next(it)) {
bson_type_t type = bson_iter_type(it);
switch (type) {
case BSON_TYPE_EOD:
break;
case BSON_TYPE_DOUBLE:
*(output_data++) = bson_iter_double(it);
break;
case BSON_TYPE_INT32:
*(output_data++) = bson_iter_int32(it);
break;
case BSON_TYPE_INT64:
*(output_data++) = bson_iter_int32(it);
break;
case BSON_TYPE_BOOL:
*(output_data++) = bson_iter_bool(it);
break;
default:
mxDestroyArray(element);
return NULL;
}
}
return element;
}
/** Convert BSON array to cell mxArray.
*/
static mxArray* ConvertBSONArrayToCellArray(bson_iter_t* it, int size) {
mxArray* element = mxCreateCellMatrix(1, size);
int i;
if (!element)
return NULL;
for (i = 0; i < size; ++i) {
mxArray* sub_element = ConvertNextToMxArray(it);
if (!sub_element) {
mxDestroyArray(element);
return NULL;
}
mxSetCell(element, i, sub_element);
}
return element;
}
/** Convert keys to matlab-safe names.
*/
static char** CreateSafeKeys(int size, const char* keys[]) {
char buffer[64]; /* Matlab's variable can be up to 63 characters. */
char** safe_keys = (char**)mxMalloc(size * sizeof(char*));
int i, j;
for (i = 0; i < size; ++i) {
const char* input = keys[i];
char* output = buffer;
bool duplicated;
int suffix = 0;
memset(buffer, 0, 64 * sizeof(char));
/* Special case: oid maps to "id_" field. */
if (strcmp(input, "_id") == 0) {
strcpy(output, "id_");
output += strlen(output);
}
else {
/* variable name: [a-zA-Z][a-zA-Z0-9_]* */
/* Trim leading non-alphanumeric. */
while (*input && !isalnum(*input))
++input;
/* If starting from numeric, prepend 'x'. */
if (*input && isdigit(*input))
*output++ = 'x';
while (*input && output < &buffer[63]) {
if (isalnum(*input))
*output++ = *input++;
else {
/* Convert any consecutive non-alphanumeric to underscore. */
*output++ = '_';
while (*input && !isalnum(*input))
++input;
}
}
}
/* If empty, name it 'x'. */
if (output == buffer)
*output++ = 'x';
/* Check if the name is duplicated. If it is, append a number. */
do {
duplicated = false;
for (j = 0; j < i; ++j)
duplicated |= (strcmp(safe_keys[j], buffer) == 0);
if (duplicated) {
/* Append a suffix if duplicated. */
char suffix_buffer[32];
int length = sprintf(suffix_buffer, "%d", suffix++);
if (output + length < &buffer[31])
strcpy(output, suffix_buffer);
else {
/* No resolution to the name collision... */
for (j = 0; j < i; ++j)
mxFree(safe_keys[j]);
mxFree(safe_keys);
return NULL;
}
}
} while (duplicated);
/* Copy the safe key name. */
safe_keys[i] = (char*)mxCalloc(strlen(buffer)+1, sizeof(char));
strcpy(safe_keys[i], buffer);
}
return safe_keys;
}
/** Delete keys.
*/
static void DestroySafekeys(int size, char** keys) {
int i;
for (i = 0; i < size; ++i)
mxFree(keys[i]);
mxFree(keys);
}
/** Convert BSON array to struct mxArray.
*/
static mxArray* ConvertBSONArrayToStructArray(bson_iter_t* it,
int size,
const char** keys) {
char** safe_keys = CreateSafeKeys(size, keys);
mxArray* element;
int i;
if (!safe_keys)
return NULL;
element = mxCreateStructMatrix(1,
1,
size,
(const char**)safe_keys);
DestroySafekeys(size, safe_keys);
if (!element)
return NULL;
for (i = 0; i < size; ++i) {
mxArray* sub_element = ConvertNextToMxArray(it);
if (!sub_element) {