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/**
* \file label.c
* \brief MINC 2.0 Label functions
* \author Bert Vincent
*
* This small set of three functions are intended to allow for the
* definition of labeled, or enumerated, volumes.
*
* Labeled volumes must have been created with the class MI_CLASS_LABEL,
* and with any integer subtype.
*
************************************************************************/
#include <stdlib.h>
#include <hdf5.h>
#include "minc2.h"
#include "minc2_private.h"
#define MI_LABEL_MAX 128
static int miswap2(unsigned short tmp)
{
unsigned char *x = (unsigned char *) &tmp;
unsigned char t = x[0];
x[0] = x[1];
x[1] = t;
return (tmp);
}
static int miswap4(unsigned int tmp)
{
unsigned char *x = (unsigned char *) &tmp;
unsigned char t = x[0];
x[0] = x[3];
x[3] = t;
t = x[1];
x[1] = x[2];
x[2] = t;
return (tmp);
}
/**
* This function associates a label name with an integer value for the given
* volume. Functions which read and write voxel values will read/write
* in integer values, and must call miget_label_name() to discover the
* descriptive text string which corresponds to the integer value.
*/
int midefine_label(mihandle_t volume, int value, const char *name)
{
int result;
if (volume == NULL || name == NULL) {
return MI_LOG_ERROR(MI2_MSG_GENERIC,"Trying to use null volume or variable");
}
if (strlen(name) > MI_LABEL_MAX) {
return MI_LOG_ERROR(MI2_MSG_GENERIC,"Label name is too long");
}
if (volume->volume_class != MI_CLASS_LABEL) {
return MI_LOG_ERROR(MI2_MSG_GENERIC,"Volume class is not label");
}
if (volume->ftype_id <= 0 || volume->mtype_id <= 0) {
return MI_LOG_ERROR(MI2_MSG_GENERIC,"Volume not initialized");
}
MI_CHECK_HDF_CALL_RET(result = H5Tenum_insert(volume->mtype_id, name, &value),"H5Tenum_insert");
/* We might have to swap these values before adding them to
* the file type.
*
* COOL! the whole purpose of HDF5 being machine independent is defeated here!
*/
if (H5Tget_order(volume->ftype_id) != H5Tget_order(volume->mtype_id)) {
switch (H5Tget_size(volume->ftype_id)) {
case 2:
value = miswap2((unsigned short) value);
break;
case 4:
value = miswap4((unsigned int) value);
break;
}
}
MI_CHECK_HDF_CALL_RET(result = H5Tenum_insert(volume->ftype_id, name, &value),"H5Tenum_insert");
return (MI_NOERROR);
}
/**
* For a labelled volume, this function retrieves the text name
* associated with a given integer value.
*
* The name pointer returned must be freed by calling mifree_name().
*/
int miget_label_name(mihandle_t volume, int value, char **name)
{
int result;
if (volume == NULL || name == NULL) {
return MI_LOG_ERROR(MI2_MSG_GENERIC,"Trying to use null volume or variable");
}
if (volume->volume_class != MI_CLASS_LABEL) {
MI_LOG_ERROR(MI2_MSG_GENERIC,"Volume class is not label");
}
if (volume->mtype_id <= 0) {
MI_LOG_ERROR(MI2_MSG_GENERIC,"Volume is not initialized");
}
*name = malloc(MI_LABEL_MAX);
if (*name == NULL) {
return MI_LOG_ERROR(MI2_MSG_OUTOFMEM,MI_LABEL_MAX);
}
H5E_BEGIN_TRY {
result = H5Tenum_nameof(volume->mtype_id, &value, *name, MI_LABEL_MAX);
} H5E_END_TRY;
MI_CHECK_HDF_CALL_RET(result,"H5Tenum_nameof");
return (MI_NOERROR);
}
/**
* This function is the inverse of miget_label_name(). It is called to determine
* what integer value, if any, corresponds to the given text string.
*/
int miget_label_value(mihandle_t volume, const char *name, int *value_ptr)
{
int result;
if (volume == NULL || name == NULL || value_ptr == NULL) {
return MI_LOG_ERROR(MI2_MSG_GENERIC,"Trying to use null volume or variable");
}
if (volume->volume_class != MI_CLASS_LABEL) {
return MI_LOG_ERROR(MI2_MSG_GENERIC,"Volume class is not label");
}
if (volume->mtype_id <= 0) {
return MI_LOG_ERROR(MI2_MSG_GENERIC,"Volume is not initialized");
}
H5E_BEGIN_TRY {
result = H5Tenum_valueof(volume->mtype_id, name, value_ptr);
} H5E_END_TRY;
MI_CHECK_HDF_CALL_RET(result,"H5Tenum_valueof");
return (MI_NOERROR);
}
/**
* This function returns the number of defined labels, if any, or zero.
*/
int miget_number_of_defined_labels(mihandle_t volume, int *number_of_labels)
{
int result;
if (volume == NULL) {
return MI_LOG_ERROR(MI2_MSG_GENERIC,"Trying to use null volume");
}
if (volume->volume_class != MI_CLASS_LABEL) {
return MI_LOG_ERROR(MI2_MSG_GENERIC,"Volume class is not label");
}
if (volume->mtype_id <= 0) {
return MI_LOG_ERROR(MI2_MSG_GENERIC,"Volume is not initialized");
}
H5E_BEGIN_TRY {
result = H5Tget_nmembers(volume->mtype_id);
} H5E_END_TRY;
MI_CHECK_HDF_CALL_RET(result,"H5Tget_nmembers");
*number_of_labels = result;
return (MI_NOERROR);
}
/**
* This function returns the label value associated with an index (0,1,...)
*/
int miget_label_value_by_index(mihandle_t volume, int idx, int *value)
{
int result;
if (volume == NULL) {
return MI_LOG_ERROR(MI2_MSG_GENERIC,"Trying to use null volume");
}
if (volume->volume_class != MI_CLASS_LABEL) {
return MI_LOG_ERROR(MI2_MSG_GENERIC,"Volume class is not label");
}
if (volume->mtype_id <= 0) {
return MI_LOG_ERROR(MI2_MSG_GENERIC,"Volume is not initialized");
}
H5E_BEGIN_TRY {
result = H5Tget_member_value(volume->mtype_id,idx,value);
} H5E_END_TRY;
MI_CHECK_HDF_CALL_RET(result,"H5Tget_member_value");
return (MI_NOERROR);
}
/* kate: indent-mode cstyle; indent-width 2; replace-tabs on; */
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