picrin/lib/blob.c

265 lines
5.2 KiB
C

/**
* See Copyright Notice in picrin.h
*/
#include "picrin.h"
#include "object.h"
pic_value
pic_blob_value(pic_state *pic, const unsigned char *buf, int len)
{
struct blob *bv;
bv = (struct blob *)pic_obj_alloc(pic, sizeof(struct blob), PIC_TYPE_BLOB);
bv->data = pic_malloc(pic, len);
bv->len = len;
if (buf) {
memcpy(bv->data, buf, len);
}
return obj_value(pic, 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) {
TYPE_CHECK(pic, argv[i], int);
if (pic_int(pic, argv[i]) < 0 || pic_int(pic, argv[i]) > 255) {
pic_error(pic, "byte out of range", 0);
}
*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_error(pic, "byte out of range", 0);
if (k < 0) {
pic_error(pic, "make-bytevector: negative length given", 1, pic_int_value(pic, 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)
{
int len;
pic_get_args(pic, "b", NULL, &len);
return pic_int_value(pic, len);
}
static pic_value
pic_blob_bytevector_u8_ref(pic_state *pic)
{
unsigned char *buf;
int len, k;
pic_get_args(pic, "bi", &buf, &len, &k);
VALID_INDEX(pic, len, k);
return pic_int_value(pic, buf[k]);
}
static pic_value
pic_blob_bytevector_u8_set(pic_state *pic)
{
unsigned char *buf;
int len, k, v;
pic_get_args(pic, "bii", &buf, &len, &k, &v);
if (v < 0 || v > 255)
pic_error(pic, "byte out of range", 0);
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)
{
unsigned char *to, *from;
int n, at, start, end, tolen, fromlen;
n = pic_get_args(pic, "bib|ii", &to, &tolen, &at, &from, &fromlen, &start, &end);
switch (n) {
case 3:
start = 0;
case 4:
end = fromlen;
}
VALID_ATRANGE(pic, tolen, at, fromlen, start, end);
memmove(to + at, from + start, end - start);
return pic_undef_value(pic);
}
static pic_value
pic_blob_bytevector_copy(pic_state *pic)
{
unsigned char *buf;
int n, start, end, len;
n = pic_get_args(pic, "b|ii", &buf, &len, &start, &end);
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) {
TYPE_CHECK(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) {
TYPE_CHECK(pic, e, int);
if (pic_int(pic, e) < 0 || pic_int(pic, e) > 255)
pic_error(pic, "byte out of range", 0);
*data++ = (unsigned char)pic_int(pic, e);
}
return blob;
}
static pic_value
pic_blob_bytevector_to_list(pic_state *pic)
{
pic_value list;
unsigned char *buf;
int n, len, start, end, i;
n = pic_get_args(pic, "b|ii", &buf, &len, &start, &end);
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);
}