picrin/extlib/benz/blob.c

283 lines
5.5 KiB
C

/**
* See Copyright Notice in picrin.h
*/
#include "picrin.h"
#include "picrin/object.h"
pic_value
pic_blob_value(pic_state *pic, const unsigned char *buf, int len)
{
struct pic_blob *bv;
bv = (struct pic_blob *)pic_obj_alloc(pic, sizeof(struct pic_blob), PIC_TYPE_BLOB);
bv->data = pic_malloc(pic, len);
bv->len = len;
if (buf) {
memcpy(bv->data, buf, len);
}
return pic_obj_value(bv);
}
unsigned char *
pic_blob(pic_state PIC_UNUSED(*pic), pic_value blob, int *len)
{
if (len) {
*len = pic_blob_ptr(pic, blob)->len;
}
return pic_blob_ptr(pic, blob)->data;
}
static pic_value
pic_blob_bytevector_p(pic_state *pic)
{
pic_value v;
pic_get_args(pic, "o", &v);
return pic_bool_value(pic, pic_blob_p(pic, v));
}
static pic_value
pic_blob_bytevector(pic_state *pic)
{
pic_value *argv, blob;
int argc, i;
unsigned char *data;
pic_get_args(pic, "*", &argc, &argv);
blob = pic_blob_value(pic, 0, argc);
data = pic_blob(pic, blob, NULL);
for (i = 0; i < argc; ++i) {
pic_assert_type(pic, argv[i], int);
if (pic_int(pic, argv[i]) < 0 || pic_int(pic, argv[i]) > 255) {
pic_errorf(pic, "byte out of range");
}
*data++ = (unsigned char)pic_int(pic, argv[i]);
}
return blob;
}
static pic_value
pic_blob_make_bytevector(pic_state *pic)
{
pic_value blob;
int k, b = 0;
pic_get_args(pic, "i|i", &k, &b);
if (b < 0 || b > 255)
pic_errorf(pic, "byte out of range");
if (k < 0) {
pic_errorf(pic, "make-bytevector: negative length given %d", k);
}
blob = pic_blob_value(pic, 0, k);
memset(pic_blob(pic, blob, NULL), (unsigned char)b, k);
return blob;
}
static pic_value
pic_blob_bytevector_length(pic_state *pic)
{
pic_value bv;
int len;
pic_get_args(pic, "b", &bv);
pic_blob(pic, bv, &len);
return pic_int_value(pic, len);
}
static pic_value
pic_blob_bytevector_u8_ref(pic_state *pic)
{
pic_value bv;
unsigned char *buf;
int k, len;
pic_get_args(pic, "bi", &bv, &k);
buf = pic_blob(pic, bv, &len);
VALID_INDEX(pic, len, k);
return pic_int_value(pic, buf[k]);
}
static pic_value
pic_blob_bytevector_u8_set(pic_state *pic)
{
pic_value bv;
unsigned char *buf;
int k, v, len;
pic_get_args(pic, "bii", &bv, &k, &v);
if (v < 0 || v > 255)
pic_errorf(pic, "byte out of range");
buf = pic_blob(pic, bv, &len);
VALID_INDEX(pic, len, k);
buf[k] = (unsigned char)v;
return pic_undef_value(pic);
}
static pic_value
pic_blob_bytevector_copy_i(pic_state *pic)
{
pic_value to, from;
unsigned char *tobuf, *frombuf;
int n, at, start, end, tolen, fromlen;
n = pic_get_args(pic, "bib|ii", &to, &at, &from, &start, &end);
tobuf = pic_blob(pic, to, &tolen);
frombuf = pic_blob(pic, from, &fromlen);
switch (n) {
case 3:
start = 0;
case 4:
end = fromlen;
}
VALID_ATRANGE(pic, tolen, at, fromlen, start, end);
memmove(tobuf + at, frombuf + start, end - start);
return pic_undef_value(pic);
}
static pic_value
pic_blob_bytevector_copy(pic_state *pic)
{
pic_value from;
unsigned char *buf;
int n, start, end, len;
n = pic_get_args(pic, "b|ii", &from, &start, &end);
buf = pic_blob(pic, from, &len);
switch (n) {
case 1:
start = 0;
case 2:
end = len;
}
VALID_RANGE(pic, len, start, end);
return pic_blob_value(pic, buf + start, end - start);
}
static pic_value
pic_blob_bytevector_append(pic_state *pic)
{
int argc, i, l, len;
unsigned char *buf, *dst;
pic_value *argv, blob;
pic_get_args(pic, "*", &argc, &argv);
len = 0;
for (i = 0; i < argc; ++i) {
pic_assert_type(pic, argv[i], blob);
pic_blob(pic, argv[i], &l);
len += l;
}
blob = pic_blob_value(pic, NULL, len);
dst = pic_blob(pic, blob, NULL);
len = 0;
for (i = 0; i < argc; ++i) {
buf = pic_blob(pic, argv[i], &l);
memcpy(dst + len, buf, l);
len += l;
}
return blob;
}
static pic_value
pic_blob_list_to_bytevector(pic_state *pic)
{
pic_value blob;
unsigned char *data;
pic_value list, e, it;
pic_get_args(pic, "o", &list);
blob = pic_blob_value(pic, 0, pic_length(pic, list));
data = pic_blob(pic, blob, NULL);
pic_for_each (e, list, it) {
pic_assert_type(pic, e, int);
if (pic_int(pic, e) < 0 || pic_int(pic, e) > 255)
pic_errorf(pic, "byte out of range");
*data++ = (unsigned char)pic_int(pic, e);
}
return blob;
}
static pic_value
pic_blob_bytevector_to_list(pic_state *pic)
{
pic_value blob, list;
unsigned char *buf;
int n, len, start, end, i;
n = pic_get_args(pic, "b|ii", &blob, &start, &end);
buf = pic_blob(pic, blob, &len);
switch (n) {
case 1:
start = 0;
case 2:
end = len;
}
VALID_RANGE(pic, len, start, end);
list = pic_nil_value(pic);
for (i = start; i < end; ++i) {
pic_push(pic, pic_int_value(pic, buf[i]), list);
}
return pic_reverse(pic, list);
}
void
pic_init_blob(pic_state *pic)
{
pic_defun(pic, "bytevector?", pic_blob_bytevector_p);
pic_defun(pic, "bytevector", pic_blob_bytevector);
pic_defun(pic, "make-bytevector", pic_blob_make_bytevector);
pic_defun(pic, "bytevector-length", pic_blob_bytevector_length);
pic_defun(pic, "bytevector-u8-ref", pic_blob_bytevector_u8_ref);
pic_defun(pic, "bytevector-u8-set!", pic_blob_bytevector_u8_set);
pic_defun(pic, "bytevector-copy!", pic_blob_bytevector_copy_i);
pic_defun(pic, "bytevector-copy", pic_blob_bytevector_copy);
pic_defun(pic, "bytevector-append", pic_blob_bytevector_append);
pic_defun(pic, "bytevector->list", pic_blob_bytevector_to_list);
pic_defun(pic, "list->bytevector", pic_blob_list_to_bytevector);
}