rosapps/smartpdf/fitz/stream/filt_ahxe.c

   1 #include "fitz-base.h"
   2 #include "fitz-stream.h"
   3
   4 typedef struct fz_ahxe_s fz_ahxe;
   5
   6 struct fz_ahxe_s
   7 {
   8         fz_filter super;
   9         int c;
  10 };
  11
  12 static const char tohex[16] = "0123456789ABCDEF";
  13
  14 fz_error *
  15 fz_newahxe(fz_filter **fp, fz_obj *params)
  16 {
  17         FZ_NEWFILTER(fz_ahxe, f, ahxe);
  18         f->c = 0;
  19         return nil;
  20 }
  21
  22 void
  23 fz_dropahxe(fz_filter *f)
  24 {
  25 }
  26
  27 fz_error *
  28 fz_processahxe(fz_filter *filter, fz_buffer *in, fz_buffer *out)
  29 {
  30         fz_ahxe *f = (fz_ahxe*)filter;
  31         int a, b, c;
  32
  33         while (1)
  34         {
  35                 if (in->rp == in->wp)
  36                         goto needinput;
  37
  38                 if (out->wp + 2 >= out->ep) /* can write 3 bytes from 1 */
  39                         return fz_ioneedout;
  40
  41                 c = *in->rp++;
  42                 a = tohex[(c >> 4) & 0x0f];
  43                 b = tohex[c & 0x0f];
  44
  45                 *out->wp++ = a;
  46                 *out->wp++ = b;
  47
  48                 f->c += 2;
  49                 if (f->c == 60) {
  50                         *out->wp++ = '\n';
  51                         f->c = 0;
  52                 }
  53         }
  54
  55 needinput:
  56         if (in->eof) {
  57                 if (out->wp == out->ep)
  58                         return fz_ioneedout;
  59                 *out->wp++ = '>';
  60                 out->eof = 1;
  61                 return fz_iodone;
  62         }
  63         return fz_ioneedin;
  64 }
  65