/* Decodes using a decodestream. Decodes as far as it can with the input
* buffers, or until a stopper is reached. */
void MVM_string_ascii_decodestream(MVMThreadContext *tc, MVMDecodeStream *ds,
MVMint32 *stopper_chars, MVMint32 *stopper_sep) {
MVMint32 count = 0, total = 0;
MVMint32 bufsize;
MVMCodepoint32 *buffer;
MVMDecodeStreamBytes *cur_bytes;
MVMDecodeStreamBytes *last_accept_bytes = ds->bytes_head;
MVMint32 last_accept_pos;
/* If there's no buffers, we're done. */
if (!ds->bytes_head)
return;
last_accept_pos = ds->bytes_head_pos;
/* If we're asked for zero chars, also done. */
if (stopper_chars && *stopper_chars == 0)
return;
/* Take length of head buffer as initial guess. */
bufsize = ds->bytes_head->length;
buffer = malloc(bufsize * sizeof(MVMCodepoint32));
/* Decode each of the buffers. */
cur_bytes = ds->bytes_head;
while (cur_bytes) {
/* Process this buffer. */
MVMint32 pos = cur_bytes == ds->bytes_head ? ds->bytes_head_pos : 0;
char *bytes = cur_bytes->bytes;
while (pos < cur_bytes->length) {
MVMCodepoint32 codepoint = bytes[pos++];
if (codepoint > 127)
MVM_exception_throw_adhoc(tc,
"Will not decode invalid ASCII (code point > 127 found)");
if (count == bufsize) {
/* We filled the buffer. Attach this one to the buffers
* linked list, and continue with a new one. */
MVM_string_decodestream_add_chars(tc, ds, buffer, bufsize);
buffer = malloc(bufsize * sizeof(MVMCodepoint32));
count = 0;
}
buffer[count++] = codepoint;
last_accept_bytes = cur_bytes;
last_accept_pos = pos;
total++;
if (stopper_chars && *stopper_chars == total)
goto done;
if (stopper_sep && *stopper_sep == codepoint)
goto done;
}
cur_bytes = cur_bytes->next;
}
done:
/* Attach what we successfully parsed as a result buffer, and trim away
* what we chewed through. */
if (count)
MVM_string_decodestream_add_chars(tc, ds, buffer, count);
MVM_string_decodestream_discard_to(tc, ds, last_accept_bytes, last_accept_pos);
}
/* Decodes using a decodestream. Decodes as far as it can with the input
* buffers, or until a stopper is reached. */
MVMuint32 MVM_string_latin1_decodestream(MVMThreadContext *tc, MVMDecodeStream *ds,
const MVMint32 *stopper_chars,
MVMDecodeStreamSeparators *seps) {
MVMint32 count = 0, total = 0;
MVMint32 bufsize;
MVMGrapheme32 *buffer;
MVMDecodeStreamBytes *cur_bytes;
MVMDecodeStreamBytes *last_accept_bytes = ds->bytes_head;
MVMint32 last_accept_pos, last_was_cr;
MVMuint32 reached_stopper;
/* If there's no buffers, we're done. */
if (!ds->bytes_head)
return 0;
last_accept_pos = ds->bytes_head_pos;
/* If we're asked for zero chars, also done. */
if (stopper_chars && *stopper_chars == 0)
return 1;
/* Take length of head buffer as initial guess. */
bufsize = ds->bytes_head->length;
buffer = MVM_malloc(bufsize * sizeof(MVMGrapheme32));
/* Decode each of the buffers. */
cur_bytes = ds->bytes_head;
last_was_cr = 0;
reached_stopper = 0;
while (cur_bytes) {
/* Process this buffer. */
MVMint32 pos = cur_bytes == ds->bytes_head ? ds->bytes_head_pos : 0;
unsigned char *bytes = (unsigned char *)cur_bytes->bytes;
while (pos < cur_bytes->length) {
MVMCodepoint codepoint = bytes[pos++];
MVMGrapheme32 graph;
if (last_was_cr) {
if (codepoint == '\n') {
graph = MVM_nfg_crlf_grapheme(tc);
}
else {
graph = '\r';
pos--;
}
last_was_cr = 0;
}
else if (codepoint == '\r') {
last_was_cr = 1;
continue;
}
else {
graph = codepoint;
}
if (count == bufsize) {
/* We filled the buffer. Attach this one to the buffers
* linked list, and continue with a new one. */
MVM_string_decodestream_add_chars(tc, ds, buffer, bufsize);
buffer = MVM_malloc(bufsize * sizeof(MVMGrapheme32));
count = 0;
}
buffer[count++] = graph;
last_accept_bytes = cur_bytes;
last_accept_pos = pos;
total++;
if (stopper_chars && *stopper_chars == total) {
reached_stopper = 1;
goto done;
}
if (MVM_string_decode_stream_maybe_sep(tc, seps, codepoint)) {
reached_stopper = 1;
goto done;
}
}
cur_bytes = cur_bytes->next;
}
done:
/* Attach what we successfully parsed as a result buffer, and trim away
* what we chewed through. */
if (count) {
MVM_string_decodestream_add_chars(tc, ds, buffer, count);
}
else {
MVM_free(buffer);
}
MVM_string_decodestream_discard_to(tc, ds, last_accept_bytes, last_accept_pos);
return reached_stopper;
}
