src/swf_cxform.c

   1 #include <stdio.h>
   2 #include "bitstream.h"
   3 #include "swf_cxform.h"
   4
   5 int
   6 swf_cxform_parse(bitstream_t *bs, swf_cxform_t *cx) {
   7     int ret, nbits;
   8     bitstream_align(bs);
   9     cx->has_add_terms  = bitstream_getbit(bs);
  10     cx->has_mult_terms = bitstream_getbit(bs);
  11     nbits = bitstream_getbits(bs, 4);
  12     cx->nbits = nbits;
  13     if (cx->has_mult_terms) {
  14         cx->red_mult_term   = bitstream_getbits(bs, nbits);
  15         cx->green_mult_term = bitstream_getbits(bs, nbits);
  16         ret = bitstream_getbits(bs, nbits);
  17         if (ret == -1) {
  18             return 1;
  19         }
  20         cx->blue_mult_term  = ret;
  21     }
  22     if (cx->has_add_terms) {
  23         cx->red_add_term   = bitstream_getbits(bs, nbits);
  24         cx->green_add_term = bitstream_getbits(bs, nbits);
  25         ret = bitstream_getbits(bs, nbits);
  26         if (ret == -1) {
  27             return 1;
  28         }
  29         cx->blue_add_term  = ret;
  30     }
  31     return 0;
  32 }
  33
  34 int
  35 swf_cxform_build(bitstream_t *bs, swf_cxform_t *cx) {
  36     int nbits;
  37     bitstream_align(bs);
  38     bitstream_putbit(bs, cx->has_add_terms);
  39     bitstream_putbit(bs, cx->has_mult_terms);
  40     nbits = cx->nbits;
  41     bitstream_putbits(bs, nbits, 4);
  42     if (cx->has_mult_terms) {
  43         bitstream_putbits(bs, cx->red_mult_term,   nbits);
  44         bitstream_putbits(bs, cx->green_mult_term, nbits);
  45         bitstream_putbits(bs, cx->blue_mult_term,  nbits);
  46     }
  47     if (cx->has_add_terms) {
  48         bitstream_putbits(bs, cx->red_add_term,   nbits);
  49         bitstream_putbits(bs, cx->green_add_term, nbits);
  50         bitstream_putbits(bs, cx->blue_add_term,  nbits);
  51     }
  52     return 0;
  53 }
  54
  55 int
  56 swf_cxform_print(swf_cxform_t *cx, int indent_depth) {
  57     print_indent(indent_depth);
  58     printf("CXFORM:");
  59     if (cx->has_mult_terms) {
  60         printf("  MultTerm:%02x%02x%02x",
  61                cx->red_mult_term, cx->green_mult_term, cx->blue_mult_term);
  62     }
  63     if (cx->has_add_terms) {
  64         printf("  AddTerm:%02x%02x%02x",
  65                cx->red_add_term, cx->green_add_term, cx->blue_add_term);
  66     }
  67     if ((cx->has_add_terms == 0) && (cx->has_mult_terms == 0)) {
  68         printf("  (no add_terms or mult_terms)");
  69     }
  70     printf("\n");
  71     return 0;
  72 }