blob: f4501ad6e9896995becbf4f2071d8cb03c03783d [file] [log] [blame]
/**
* @author: Jeff Thompson
* See COPYING for copyright and distribution information.
*/
#ifndef NDN_BINARYXMLELEMENTREADER_H
#define NDN_BINARYXMLELEMENTREADER_H
#include "../errors.h"
#include "BinaryXMLStructureDecoder.h"
#include "../util/DynamicUCharArray.h"
#ifdef __cplusplus
extern "C" {
#endif
/** An ndn_ElementListener struct holds a function pointer onReceivedElement. You can extend this struct with data that
* will be passed to onReceivedElement.
*/
struct ndn_ElementListener {
void (*onReceivedElement)(struct ndn_ElementListener *self, unsigned char *element, unsigned int elementLength); /**< see ndn_ElementListener_init */
};
/**
* Initialize an ndn_ElementListener struct to use the onReceivedElement function pointer.
* @param self pointer to the ndn_ElementListener struct
* @param onReceivedElement pointer to a function which is called when an entire binary XML element is received.
* self is the pointer to this ndn_ElementListener struct. See ndn_BinaryXmlElementReader_onReceivedData.
*/
static inline void ndn_ElementListener_init
(struct ndn_ElementListener *self, void (*onReceivedElement)(struct ndn_ElementListener *self, unsigned char *element, unsigned int elementLength))
{
self->onReceivedElement = onReceivedElement;
}
/**
* A BinaryXmlElementReader lets you call ndn_BinaryXmlElementReader_onReceivedData multiple times which uses an
* ndn_BinaryXmlStructureDecoder to detect the end of a binary XML element and calls
* (*elementListener->onReceivedElement)(element, elementLength) with the element.
* This handles the case where a single call to onReceivedData may contain multiple elements.
*/
struct ndn_BinaryXmlElementReader {
struct ndn_ElementListener *elementListener;
struct ndn_BinaryXmlStructureDecoder structureDecoder;
int usePartialData;
struct ndn_DynamicUCharArray partialData;
unsigned int partialDataLength;
};
/**
* Initialize an ndn_BinaryXmlElementReader struct with the elementListener and a buffer for saving partial data.
* @param self pointer to the ndn_BinaryXmlElementReader struct
* @param elementListener pointer to the ndn_ElementListener used by ndn_BinaryXmlElementReader_onReceivedData.
* @param buffer the allocated buffer. If reallocFunction is null, this should be large enough to save a full element, perhaps 8000 bytes.
* @param bufferLength the length of the buffer
* @param reallocFunction see ndn_DynamicUCharArray_ensureLength. This may be 0.
*/
static inline void ndn_BinaryXmlElementReader_init
(struct ndn_BinaryXmlElementReader *self, struct ndn_ElementListener *elementListener,
unsigned char *buffer, unsigned int bufferLength, unsigned char * (*reallocFunction)(unsigned char *, unsigned int))
{
self->elementListener = elementListener;
ndn_BinaryXmlStructureDecoder_init(&self->structureDecoder);
self->usePartialData = 0;
ndn_DynamicUCharArray_init(&self->partialData, buffer, bufferLength, reallocFunction);
}
/**
* Continue to read binary XML data until the end of an element, then call (*elementListener->onReceivedElement)(element, elementLength).
* The buffer passed to onReceivedElement is only valid during this call. If you need the data later, you must copy.
* @param self pointer to the ndn_BinaryXmlElementReader struct
* @param data pointer to the buffer with the binary XML bytes
* @param dataLength length of data
* @return 0 for success, else an error code
*/
ndn_Error ndn_BinaryXmlElementReader_onReceivedData
(struct ndn_BinaryXmlElementReader *self, unsigned char *data, unsigned int dataLength);
#ifdef __cplusplus
}
#endif
#endif