/*-
 * Copyright (c)2003 Citrus Project,
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "dcmtk/config/osconfig.h"
#include "citrus_memstream.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "citrus_bcs.h"
#include "citrus_region.h"

const char *
_citrus_memory_stream_getln(struct _citrus_memory_stream * ms,
    size_t * rlen)
{
    const uint8_t *h, *p;
    size_t i, ret;

    if (ms->ms_pos>=_citrus_region_size(&ms->ms_region))
        return (NULL);

    h = p = (uint8_t *)_citrus_region_offset(&ms->ms_region, ms->ms_pos);
    ret = 0;
    for (i = _citrus_region_size(&ms->ms_region) - ms->ms_pos; i > 0; i--) {
        ret++;
        if (_citrus_bcs_iseol(*p))
            break;
        p++;
    }

    ms->ms_pos += ret;
    *rlen = ret;
    return ((const char *)h);
}

#define T_COMM  '#'

const char *
_citrus_memory_stream_matchline(struct _citrus_memory_stream * ms,
    const char * key, size_t * rlen, int iscasesensitive)
{
    const char *p, *q;
    size_t keylen, len;

    keylen = strlen(key);
    for(;;) {
        p = _citrus_memory_stream_getln(ms, &len);
        if (p == NULL)
            return (NULL);

        /* ignore comment */
        q = memchr(p, T_COMM, len);
        if (q) {
            len = q - p;
        }
        /* ignore trailing white space and newline */
        _citrus_bcs_trunc_rws_len(p, &len);
        if (len == 0)
            continue; /* ignore null line */

        /* skip white spaces at the head of the line */
        p = _citrus_bcs_skip_ws_len(p, &len);
        q = _citrus_bcs_skip_nonws_len(p, &len);

        if ((size_t)(q - p) == keylen) {
            if (iscasesensitive) {
                if (memcmp(key, p, keylen) == 0)
                    break; /* match */
            } else {
                if (_citrus_bcs_strncasecmp(key, p, keylen) == 0)
                    break; /* match */
            }
        }
    }

    p = _citrus_bcs_skip_ws_len(q, &len);
    *rlen = len;

    return (p);
}

void *
_citrus_memory_stream_chr(struct _citrus_memory_stream *ms,
    struct _citrus_region *r, char ch)
{
    void *chr, *head;
    size_t sz;

    if (ms->ms_pos >= _citrus_region_size(&ms->ms_region))
        return (NULL);

    head = _citrus_region_offset(&ms->ms_region, ms->ms_pos);
    chr = memchr(head, ch, _citrus_memory_stream_remainder(ms));
    if (chr == NULL) {
        _citrus_region_init(r, head, _citrus_memory_stream_remainder(ms));
        ms->ms_pos = _citrus_region_size(&ms->ms_region);
        return (NULL);
    }
    sz = (char *)chr - (char *)head;

    _citrus_region_init(r, head, sz);
    ms->ms_pos += sz + 1;

    return (chr);
}

void
_citrus_memory_stream_skip_ws(struct _citrus_memory_stream *ms)
{
    int ch;

    while ((ch = _citrus_memory_stream_peek(ms)) != EOF) {
        if (!_citrus_bcs_isspace((uint8_t)ch))
            break;
        _citrus_memory_stream_getc(ms);
    }
}