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/*
* upb - a minimalist implementation of protocol buffers.
*
* Copyright (c) 2010 Joshua Haberman. See LICENSE for details.
*/
#include "upb_strstream.h"
#include <stdlib.h>
#include "upb_string.h"
static upb_strlen_t upb_stringsrc_read(upb_bytesrc *_src, void *buf,
upb_strlen_t count, upb_status *status) {
upb_stringsrc *src = (upb_stringsrc*)_src;
if (src->offset == upb_string_len(src->str)) {
status->code = UPB_EOF;
return -1;
} else {
upb_strlen_t to_read = UPB_MIN(count, upb_string_len(src->str) - src->offset);
memcpy(buf, upb_string_getrobuf(src->str) + src->offset, to_read);
src->offset += to_read;
return to_read;
}
}
static bool upb_stringsrc_getstr(upb_bytesrc *_src, upb_string *str,
upb_status *status) {
upb_stringsrc *src = (upb_stringsrc*)_src;
if (src->offset == upb_string_len(src->str)) {
status->code = UPB_EOF;
return false;
} else {
upb_strlen_t len = upb_string_len(src->str) - src->offset;
upb_string_substr(str, src->str, src->offset, len);
src->offset += len;
assert(src->offset == upb_string_len(src->str));
return true;
}
}
void upb_stringsrc_init(upb_stringsrc *s) {
static upb_bytesrc_vtbl bytesrc_vtbl = {
upb_stringsrc_read,
upb_stringsrc_getstr,
};
s->str = NULL;
upb_bytesrc_init(&s->bytesrc, &bytesrc_vtbl);
}
void upb_stringsrc_reset(upb_stringsrc *s, upb_string *str) {
if (str != s->str) {
upb_string_unref(s->str);
s->str = upb_string_getref(str);
}
s->offset = 0;
}
void upb_stringsrc_uninit(upb_stringsrc *s) {
upb_string_unref(s->str);
}
upb_bytesrc *upb_stringsrc_bytesrc(upb_stringsrc *s) {
return &s->bytesrc;
}
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