libs/basekit/source/BStreamTag.c

   1 /*#io
   2 docCopyright("Steve Dekorte", 2004)
   3 docLicense("BSD revised") *
   4 */
   5
   6 #include "BStreamTag.h"
   7 #include <stdio.h>
   8
   9 /*
  10  unsigned int isArray   : 1;
  11  unsigned int type      : 2;
  12  unsigned int byteCount : 5;
  13  */
  14
  15 BStreamTag BStreamTag_FromUnsignedChar(unsigned char c)
  16 {
  17         // we need to do this because bit fields are compiler dependent
  18         BStreamTag t;
  19         t.isArray = c >> 7;
  20         t.type = ( c << 1) >> 6;
  21         t.byteCount = ( c << 3 ) >> 3;
  22         return t;
  23 }
  24
  25 unsigned char BStreamTag_asUnsignedChar(BStreamTag *self)
  26 {
  27         BStreamTag t = *self;
  28         unsigned char c = 0;
  29         c = c | t.isArray << 7;
  30         c = c | t.type << 5;
  31         c = c | t.byteCount;
  32         return c;
  33 }
  34
  35 // -----------------------------------------------------
  36
  37 BStreamTag BStreamTag_TagArray_type_byteCount_(unsigned int a, unsigned int t, unsigned int b)
  38 {
  39         BStreamTag self;
  40         self.isArray = a;
  41         self.type = t;
  42         self.byteCount = b;
  43         return self;
  44 }
  45
  46 int BStreamTag_isEqual_(BStreamTag *self, BStreamTag *other)
  47 {
  48         return (BStreamTag_asUnsignedChar(self) == BStreamTag_asUnsignedChar(other));
  49 }
  50
  51 void BStreamTag_print(BStreamTag *self)
  52 {
  53         printf("[Tag ");
  54         printf("isArray: %i ", self->isArray);
  55         printf("type: %i ", self->type);
  56         printf("byteCount: %i", self->byteCount);
  57         printf("]");
  58 }
  59
  60 char *BStreamTag_typeName(BStreamTag *self)
  61 {
  62         switch (self->type)
  63         {
  64                 case BSTREAM_UNSIGNED_INT:
  65                         return "uint";
  66                 case BSTREAM_SIGNED_INT:
  67                         return "int";
  68                 case BSTREAM_FLOAT:
  69                         return "float";
  70                 case BSTREAM_POINTER:
  71                         return "pointer";
  72         }
  73
  74         return "UNKNOWN TYPE";
  75 }