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#include "fitz_base.h"
#include "fitz_stream.h"
typedef struct fz_ahxd_s fz_ahxd;
struct fz_ahxd_s
{
fz_filter super;
int odd;
int a;
};
static inline int iswhite(int a)
{
switch (a) {
case '\n': case '\r': case '\t': case ' ':
case '\0': case '\f': case '\b': case 0177:
return 1;
}
return 0;
}
static inline int ishex(int a)
{
return (a >= 'A' && a <= 'F') ||
(a >= 'a' && a <= 'f') ||
(a >= '0' && a <= '9');
}
static inline int fromhex(int a)
{
if (a >= 'A' && a <= 'F')
return a - 'A' + 0xA;
if (a >= 'a' && a <= 'f')
return a - 'a' + 0xA;
if (a >= '0' && a <= '9')
return a - '0';
return 0;
}
fz_error
fz_newahxd(fz_filter **fp, fz_obj *params)
{
FZ_NEWFILTER(fz_ahxd, f, ahxd);
f->odd = 0;
f->a = 0;
return fz_okay;
}
void
fz_dropahxd(fz_filter *f)
{
}
fz_error
fz_processahxd(fz_filter *filter, fz_buffer *in, fz_buffer *out)
{
fz_ahxd *f = (fz_ahxd*)filter;
int b, c;
while (1)
{
if (in->rp == in->wp)
return fz_ioneedin;
if (out->wp == out->ep)
return fz_ioneedout;
c = *in->rp++;
if (ishex(c)) {
if (!f->odd) {
f->a = fromhex(c);
f->odd = 1;
}
else {
b = fromhex(c);
*out->wp++ = (f->a << 4) | b;
f->odd = 0;
}
}
else if (c == '>') {
if (f->odd)
*out->wp++ = (f->a << 4);
return fz_iodone;
}
else if (!iswhite(c)) {
return fz_throw("bad data in ahxd: '%c'", c);
}
}
}
void
fz_pushbackahxd(fz_filter *filter, fz_buffer *in, fz_buffer *out, int n)
{
int k;
assert(filter->process == fz_processahxd);
assert(out->wp - n >= out->rp);
k = 0;
while (k < n * 2) {
in->rp --;
if (ishex(*in->rp))
k ++;
}
out->wp -= n;
}
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