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#include "parse.h"
void bs_init_bstream_size(struct bytestream* bs,struct bytestream* other,size_t maxlen) {
bs->type = BSTREAM;
// check if we have enough capacity in the parent bytestream
if (bs_capacityassert(other, maxlen)) {
bs->cur = 0;
bs->max = maxlen;
} else {
// nope, so set the new stream to error state right out of the box
bs->cur = 1;
bs->max = 0;
}
bs->u.bs=other;
}
#ifdef UNITTEST
#include <assert.h>
#undef UNITTEST
#include "buffer/bs_get.c"
#include "buffer/bs_err.c"
#include "buffer/bs_capacityassert.c"
#include "buffer/bs_init_membuf.c"
// we use membuf here, mock buffer stuff away
ssize_t buffer_getc(buffer* b,char* x) { return 0; }
int main() {
struct bytestream bs = BS_FROM_MEMBUF("\x12\x34\x56\x78",4);
struct bytestream sub;
assert(bs_get(&bs) == 0x12); // eat one byte
bs_init_bstream_size(&sub, &bs, 2); // 2 byte substream
assert(bs_get(&sub) == 0x34); // make sure we got the offset right
assert(bs_get(&sub) == 0x56); // read second (and last) byte
assert(bs_err(&sub) == 0); // should have no errors yet
assert(bs_err(&bs) == 0);
assert(bs_get(&sub) == 0); // next byte should error out
assert(bs_err(&sub)); // substream should have error state
assert(bs_err(&bs) == 0); // parent stream not
assert(bs_get(&bs) == 0x78); // and we should not have overstepped
// now check the range checking in bs_init_bstream_size itself
bs_init_membuf(&bs, (const unsigned char*)"\x12\x34\x56\x78", 4);
bs_init_bstream_size(&sub, &bs, 4); // tight fit
assert(bs_err(&sub) == 0);
assert(bs_err(&bs) == 0);
bs_init_bstream_size(&sub, &bs, 5);
assert(bs_err(&sub));
assert(bs_err(&bs));
}
#endif