chris@160: /**
chris@160:  * Copyright (c) 2014, 2015, Enzien Audio Ltd.
chris@160:  *
chris@160:  * Permission to use, copy, modify, and/or distribute this software for any
chris@160:  * purpose with or without fee is hereby granted, provided that the above
chris@160:  * copyright notice and this permission notice appear in all copies.
chris@160:  *
chris@160:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
chris@160:  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
chris@160:  * AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
chris@160:  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
chris@160:  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
chris@160:  * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
chris@160:  * PERFORMANCE OF THIS SOFTWARE.
chris@160:  */
chris@160: 
chris@160: #ifndef _HEAVY_MESSAGE_H_
chris@160: #define _HEAVY_MESSAGE_H_
chris@160: 
chris@160: #include "Utils.h"
chris@160: 
chris@160: typedef enum ElementType {
chris@160:   BANG,
chris@160:   FLOAT,
chris@160:   SYMBOL,
chris@160:   HASH
chris@160: } ElementType;
chris@160: 
chris@160: typedef struct Element {
chris@160:   ElementType type;
chris@160:   union {
chris@160:     float f; // float
chris@160:     char *s; // symbol
chris@160:     hv_uint32_t h; // hash
chris@160:   } data;
chris@160: } Element;
chris@160: 
chris@160: typedef struct HvMessage {
chris@160:   hv_uint32_t timestamp; // the sample at which this message should be processed
chris@160:   hv_uint16_t numElements;
chris@160:   hv_uint16_t numBytes; // the number of bytes that this message occupies in memory
chris@160:   Element elem;
chris@160: } HvMessage;
chris@160: 
chris@160: #define HV_MESSAGE_ON_STACK(_x) (HvMessage *) hv_alloca(msg_getByteSize(_x))
chris@160: 
chris@160: /** Returns the total length in bytes of this message for a given number of elements. */
chris@160: static inline hv_size_t msg_getByteSize(hv_size_t numElements) {
chris@160:   hv_assert(numElements > 0);
chris@160:   return sizeof(HvMessage) + ((numElements-1) * sizeof(Element));
chris@160: }
chris@160: 
chris@160: HvMessage *msg_copy(const HvMessage *m);
chris@160: 
chris@160: /** Returns the number of bytes that this message would occupy on the heap. */
chris@160: hv_size_t msg_getNumHeapBytes(const HvMessage *m);
chris@160: 
chris@160: /** Copies the message into the given buffer. The buffer must be at least as large as msg_getNumHeapBytes(). */
chris@160: void msg_copyToBuffer(const HvMessage *m, char *buffer, hv_size_t len);
chris@160: 
chris@160: void msg_setElementToFrom(HvMessage *n, int indexN, const HvMessage *const m, int indexM);
chris@160: 
chris@160: /** Frees a message on the heap. Does nothing if argument is NULL. */
chris@160: void msg_free(HvMessage *m);
chris@160: 
chris@160: HvMessage *msg_init(HvMessage *m, hv_size_t numElements, hv_uint32_t timestamp);
chris@160: 
chris@160: HvMessage *msg_initWithFloat(HvMessage *m, hv_uint32_t timestamp, float f);
chris@160: 
chris@160: HvMessage *msg_initWithBang(HvMessage *m, hv_uint32_t timestamp);
chris@160: 
chris@160: HvMessage *msg_initWithSymbol(HvMessage *m, hv_uint32_t timestamp, char *s);
chris@160: 
chris@160: HvMessage *msg_initWithHash(HvMessage *m, hv_uint32_t timestamp, hv_uint32_t h);
chris@160: 
chris@160: HvMessage *msg_initV(HvMessage *const m, const hv_uint32_t timestamp, const char *format, ...);
chris@160: 
chris@160: static inline hv_uint32_t msg_getTimestamp(const HvMessage *m) {
chris@160:   return m->timestamp;
chris@160: }
chris@160: 
chris@160: static inline void msg_setTimestamp(HvMessage *m, hv_uint32_t timestamp) {
chris@160:   m->timestamp = timestamp;
chris@160: }
chris@160: 
chris@160: static inline int msg_getNumElements(const HvMessage *m) {
chris@160:   return (int) m->numElements;
chris@160: }
chris@160: 
chris@160: /** Returns the number of bytes this message in memory. */
chris@160: static inline hv_size_t msg_getNumBytes(const HvMessage *m) {
chris@160:   return m->numBytes;
chris@160: }
chris@160: 
chris@160: static inline ElementType msg_getType(const HvMessage *m, int index) {
chris@160:   hv_assert(index < msg_getNumElements(m)); // invalid index
chris@160:   return (&(m->elem)+index)->type;
chris@160: }
chris@160: 
chris@160: static inline void msg_setBang(HvMessage *m, int index) {
chris@160:   hv_assert(index < msg_getNumElements(m)); // invalid index
chris@160:   (&(m->elem)+index)->type = BANG;
chris@160:   (&(m->elem)+index)->data.s = NULL;
chris@160: }
chris@160: 
chris@160: static inline bool msg_isBang(const HvMessage *m, int index) {
chris@160:   return (index < msg_getNumElements(m)) ? (msg_getType(m,index) == BANG) : false;
chris@160: }
chris@160: 
chris@160: static inline void msg_setFloat(HvMessage *m, int index, float f) {
chris@160:   hv_assert(index < msg_getNumElements(m)); // invalid index
chris@160:   (&(m->elem)+index)->type = FLOAT;
chris@160:   (&(m->elem)+index)->data.f = f;
chris@160: }
chris@160: 
chris@160: static inline float msg_getFloat(const HvMessage *const m, int index) {
chris@160:   hv_assert(index < msg_getNumElements(m)); // invalid index
chris@160:   return (&(m->elem)+index)->data.f;
chris@160: }
chris@160: 
chris@160: static inline bool msg_isFloat(const HvMessage *const m, int index) {
chris@160:   return (index < msg_getNumElements(m)) ? (msg_getType(m,index) == FLOAT) : false;
chris@160: }
chris@160: 
chris@160: static inline void msg_setHash(HvMessage *m, int index, hv_uint32_t h) {
chris@160:   hv_assert(index < msg_getNumElements(m)); // invalid index
chris@160:   (&(m->elem)+index)->type = HASH;
chris@160:   (&(m->elem)+index)->data.h = h;
chris@160: }
chris@160: 
chris@160: static inline bool msg_isHash(const HvMessage *m, int index) {
chris@160:   return (index < msg_getNumElements(m)) ? (msg_getType(m, index) == HASH) : false;
chris@160: }
chris@160: 
chris@160: /** Returns true if the element is a hash or symbol. False otherwise. */
chris@160: static inline bool msg_isHashLike(const HvMessage *m, int index) {
chris@160:   return (index < msg_getNumElements(m)) ? ((msg_getType(m, index) == HASH) || (msg_getType(m, index) == SYMBOL)) : false;
chris@160: }
chris@160: 
chris@160: /** Returns a 32-bit hash of the given string. */
chris@160: hv_uint32_t msg_symbolToHash(const char *s);
chris@160: 
chris@160: /** Returns a 32-bit hash of the given element. */
chris@160: hv_uint32_t msg_getHash(const HvMessage *const m, int i);
chris@160: 
chris@160: static inline void msg_setSymbol(HvMessage *m, int index, char *s) {
chris@160:   hv_assert(index < msg_getNumElements(m)); // invalid index
chris@160:   (&(m->elem)+index)->type = SYMBOL;
chris@160:   (&(m->elem)+index)->data.s = s;
chris@160: }
chris@160: 
chris@160: static inline char *msg_getSymbol(const HvMessage *m, int index) {
chris@160:   hv_assert(index < msg_getNumElements(m)); // invalid index
chris@160:   return (&(m->elem)+index)->data.s;
chris@160: }
chris@160: 
chris@160: static inline bool msg_isSymbol(const HvMessage *m, int index) {
chris@160:   return (index < msg_getNumElements(m)) ? (msg_getType(m, index) == SYMBOL) : false;
chris@160: }
chris@160: 
chris@160: bool msg_compareSymbol(const HvMessage *m, int i, const char *s);
chris@160: 
chris@160: /** Returns 1 if the element i_m of message m is equal to element i_n of message n. */
chris@160: bool msg_equalsElement(const HvMessage *m, int i_m, const HvMessage *n, int i_n);
chris@160: 
chris@160: bool msg_hasFormat(const HvMessage *m, const char *fmt);
chris@160: 
chris@160: /**
chris@160:  * Create a string representation of the message. Suitable for use by the print object.
chris@160:  * The resulting string must be freed by the caller.
chris@160:  */
chris@160: char *msg_toString(const HvMessage *msg);
chris@160: 
chris@160: /**
chris@160:  * Resolves any number of dollar arguments and generates a string based on the arguments.
chris@160:  * @param m  The message from which to take values
chris@160:  * @param n  The message to fill in
chris@160:  * @param z  The element index to resolve
chris@160:  * @param buf  The scratch (i.e. resolution) buffer
chris@160:  * @param len  The length of the scratch buffer
chris@160:  * @param args  A string of 'i' and 's' chars indicating the type of the arguments, either indicies or strings
chris@160:  * @param varargs  The components to resolve, either dollar indicies or strings.
chris@160:  * If the index is negative, the graph id is used
chris@160:  * @return  true if the resolution buffer is needed, false otherwise.
chris@160:  */
chris@160: // bool msg_resolveDollarArguments(HvMessage *m, HvMessage *n, int z, char *buf, hv_size_t len, const char *args, ...);
chris@160: 
chris@160: #endif // _HEAVY_MESSAGE_H_