labcomm_private.h 8.33 KB
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#ifndef _LABCOMM_PRIVATE_H_
#define _LABCOMM_PRIVATE_H_

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#ifdef LABCOMM_COMPAT
  #include LABCOMM_COMPAT
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#else
  #include <endian.h>
  #include <stdio.h>
#endif

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#include <stdlib.h>
#include <string.h>
#include "labcomm.h"

/*
 * Predeclared aggregate type indices
 */
#define LABCOMM_TYPEDEF  0x01
#define LABCOMM_SAMPLE   0x02
#define LABCOMM_ARRAY    0x10
#define LABCOMM_STRUCT   0x11

/*
 * Predeclared primitive type indices
 */
#define LABCOMM_BOOLEAN  0x20 
#define LABCOMM_BYTE     0x21
#define LABCOMM_SHORT    0x22
#define LABCOMM_INT      0x23
#define LABCOMM_LONG     0x24
#define LABCOMM_FLOAT    0x25
#define LABCOMM_DOUBLE   0x26
#define LABCOMM_STRING   0x27

/*
 * Start index for user defined types
 */
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#define LABCOMM_USER     0x40
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/*
 * Semi private decoder declarations
 */
typedef void (*labcomm_handler_typecast_t)(void *, void *);

typedef void (*labcomm_decoder_typecast_t)(
  struct labcomm_decoder *,
  labcomm_handler_typecast_t,
  void *);

typedef struct labcomm_decoder {
  void *context;
  labcomm_reader_t reader;
  void (*do_register)(struct labcomm_decoder *, 
		      labcomm_signature_t *, 
		      labcomm_decoder_typecast_t,
		      labcomm_handler_typecast_t,
		      void *context);
  int (*do_decode_one)(struct labcomm_decoder *decoder);
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  labcomm_error_handler_callback on_error;
  labcomm_handle_new_datatype_callback on_new_datatype;
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} labcomm_decoder_t;

/*
 * Non typesafe registration function to be called from
 * generated labcomm_decoder_register_* functions.
 */
void labcomm_internal_decoder_register(
  labcomm_decoder_t *, 
  labcomm_signature_t *, 
  labcomm_decoder_typecast_t,
  labcomm_handler_typecast_t,
  void *context);

#if __BYTE_ORDER == __LITTLE_ENDIAN

#define LABCOMM_DECODE(name, type)					\
  static inline type labcomm_read_##name(labcomm_reader_t *r) {		\
    type result; int i;							\
    for (i = sizeof(type) - 1 ; i >= 0 ; i--) {				\
      if (r->pos >= r->count) {						\
	r->read(r, labcomm_reader_continue);				\
      }									\
      ((unsigned char*)(&result))[i] = r->data[r->pos];			\
      r->pos++;								\
    }									\
    return result;							\
  }									\
  static inline type labcomm_decode_##name(labcomm_decoder_t *d) {	\
    return labcomm_read_##name(&d->reader);				\
  }

#else

#define LABCOMM_DECODE(name, type)					\
  static inline type labcomm_read_##name(labcomm_reader_t *r) {		\
    type result; int i;							\
    for (i = 0 ; i < sizeof(type) ; i++) {				\
      if (r->pos >= r->count) {						\
	r->read(r, labcomm_reader_continue);				\
      }									\
      ((unsigned char*)(&result))[i] = r->data[r->pos];			\
      r->pos++;								\
    }									\
    return result;							\
  }									\
  static inline type labcomm_decode_##name(labcomm_decoder_t *d) {	\
    return labcomm_read_##name(&d->reader);				\
  }

#endif

LABCOMM_DECODE(boolean, unsigned char)
LABCOMM_DECODE(byte, unsigned char)
LABCOMM_DECODE(short, short)
LABCOMM_DECODE(int, int)
LABCOMM_DECODE(long, long long)
LABCOMM_DECODE(float, float)
LABCOMM_DECODE(double, double)
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static inline unsigned int labcomm_unpack32(labcomm_reader_t *r)
{
  unsigned int res=0;
  unsigned char i=0;
  unsigned char cont=1;
  do {
    if (r->pos >= r->count) {	
      r->read(r, labcomm_reader_continue);
    }
#ifdef IDIOTDEBUG
    {
	int k;
	for(k=0; k<=r->pos; k++) printf("%2x\n", r->data[k]);
    }
#endif
    unsigned char c = r->data[r->pos];
    res |= (c & 0x7f) << 7*i;
    cont = c & 0x80;
#ifdef IDIOTDEBUG
    printf("unpack32: %x (%x, %d, %d)\n", res, c, i, cont);
#endif
    i++;
    r->pos++;
  } while(cont);
  return res;
}

static inline unsigned int labcomm_decode_packed32(labcomm_decoder_t *d) 
{
    return labcomm_unpack32(&d->reader);
}

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static inline char *labcomm_read_string(labcomm_reader_t *r)
{
  char *result;
  int length, i; 
  
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  length = labcomm_unpack32(r);
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  result = malloc(length + 1);
  for (i = 0 ; i < length ; i++) {
    if (r->pos >= r->count) {	
      r->read(r, labcomm_reader_continue);
    }
    result[i] = r->data[r->pos];
    r->pos++;
  }
  result[length] = 0;
  return result;
}

static inline char *labcomm_decode_string(labcomm_decoder_t *d)
{
  return labcomm_read_string(&d->reader);
}

static inline int labcomm_buffer_read(struct labcomm_reader *r, 
				      labcomm_reader_action_t action)
{
  // If this gets called, it is an error, 
  // so note error and let producer proceed
  r->context = r;
  r->pos = 0;
  return 0;
}

static inline int labcomm_buffer_reader_error(struct labcomm_reader *r) 
{
  return r->context != NULL;
} 

static inline void labcomm_buffer_reader_setup(
  labcomm_reader_t *r,
  void *data,
  int length)
{
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  r->context = NULL; // Used as error flag
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  r->data = data;  
  r->data_size = length;
  r->count = length;
  r->pos = 0;
  r->read = labcomm_buffer_read;
}

/*
 * Semi private encoder declarations
 */
typedef void (*labcomm_encode_typecast_t)(
  struct labcomm_encoder *,
  void *value);

typedef struct labcomm_encoder {
  void *context;
  labcomm_writer_t writer;
  void (*do_register)(struct labcomm_encoder *encoder, 
		      labcomm_signature_t *signature,
		      labcomm_encode_typecast_t);
  void (*do_encode)(struct labcomm_encoder *encoder, 
		    labcomm_signature_t *signature, 
		    void *value);
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  labcomm_error_handler_callback on_error;
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} labcomm_encoder_t;

void labcomm_internal_encoder_register(
  labcomm_encoder_t *encoder, 
  labcomm_signature_t *signature, 
  labcomm_encode_typecast_t encode);

void labcomm_internal_encode(
  labcomm_encoder_t *encoder, 
  labcomm_signature_t *signature, 
  void *value);

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/* Should these really be visible? */
void labcomm_encoder_start(struct labcomm_encoder *e,
                           labcomm_signature_t *s) ;

//HERE BE DRAGONS: is the signature_t* needed here?
void labcomm_encoder_end(struct labcomm_encoder *e,
                           labcomm_signature_t *s) ;



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#if __BYTE_ORDER == __LITTLE_ENDIAN

#define LABCOMM_ENCODE(name, type)					\
  static inline void labcomm_write_##name(labcomm_writer_t *w, type data) { \
    int i;								\
    for (i = sizeof(type) - 1 ; i >= 0 ; i--) {				\
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      if (w->pos >= w->count) { /*buffer is full*/			\
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	w->write(w, labcomm_writer_continue);				\
      }									\
      w->data[w->pos] = ((unsigned char*)(&data))[i];			\
      w->pos++;								\
    }									\
  }									\
  static inline void labcomm_encode_##name(labcomm_encoder_t *e, type data) { \
    labcomm_write_##name(&e->writer, data);				\
  }

#else

#define LABCOMM_ENCODE(name, type)					\
  static inline void labcomm_write_##name(labcomm_writer_t *w, type data) { \
    int i;								\
    for (i = 0 ; i < sizeof(type) ; i++) {				\
      if (w->pos >= w->count) {						\
	w->write(w, labcomm_writer_continue);			\
      }									\
      w->data[w->pos] = ((unsigned char*)(&data))[i];			\
      w->pos++;								\
    }									\
  }									\
  static inline void labcomm_encode_##name(labcomm_encoder_t *e, type data) { \
    labcomm_write_##name(&e->writer, data);				\
  }

#endif

LABCOMM_ENCODE(boolean, unsigned char)
LABCOMM_ENCODE(byte, unsigned char)
LABCOMM_ENCODE(short, short)
LABCOMM_ENCODE(int, int)
LABCOMM_ENCODE(long, long long)
LABCOMM_ENCODE(float, float)
LABCOMM_ENCODE(double, double)
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/* 
 * Pack the 32 bit number data as a sequence of 7 bit chunks, represented in bytes 
 * with the high bit meaning that more data is to come.
 *
 * The chunks are sent "little endian": each 7 bit chunk is more significant than
 * the previous.
 */ 
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static inline void labcomm_pack32(labcomm_writer_t *w, unsigned int data)
{
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  unsigned int tmp; 
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  tmp = data;

  while (tmp >= 0x80) {
    if (w->pos >= w->count) {	
      w->write(w, labcomm_writer_continue);
    }
    w->data[w->pos] = (tmp & 0x7f) | 0x80;
    w->pos++;
    tmp >>= 7;
  } 
  w->data[w->pos] = tmp; 
  w->pos++;
}

static inline void labcomm_encode_packed32(labcomm_encoder_t *e, unsigned int data) 
{ 
    labcomm_pack32(&e->writer, data);				
}

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static inline void labcomm_write_string(labcomm_writer_t *w, char *s)
{
  int length, i; 

  length = strlen((char*)s);
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  labcomm_pack32(w, length);
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  for (i = 0 ; i < length ; i++) {
    if (w->pos >= w->count) {	
      w->write(w, labcomm_writer_continue);
    }
    w->data[w->pos] = s[i];
    w->pos++;
  }
}

static inline void labcomm_encode_string(labcomm_encoder_t *e, 
					 char *s)
{
  labcomm_write_string(&e->writer, s);
}

void labcomm_encode_type_index(labcomm_encoder_t *e, labcomm_signature_t *s);

#endif