/*
 * ================================
 * eli960@qq.com
 * http://linuxmail.cn/
 * 2020年08月31日
 * ================================
 */

#include "zcc/zcc_stdlib.h"

zcc_namespace_begin;

void xml_unescape_string(const char *data, int64_t len, std::string &content)
{
 if (len < 0)
 {
 len = (int64_t)std::strlen(data);
 }
 char *ps = (char *)(void *)data, *end = ps + len;
 for (; ps < end;)
 {
 int ch = ps[0];
 if (ch == '<')
 {
 break;
 }
 ps++;
 if (ch == '&')
 {
 if (ps[0] == '#')
 {
 ps += 1;
 int u = 0, x = 10;
 if ((ps[0] == 'x') || (ps[0] == 'X'))
 {
 x = 16;
 ps++;
 }
 for (; ps < end; ps++)
 {
 if (ps[0] == ';')
 {
 break;
 }
 u = u * x + hex_char_to_int(ps[0]);
 }
 char wchar[6 + 1];
 int nlen = ncr_decode(u, wchar);
 if (nlen > 0)
 {
 content.append(wchar, nlen);
 }
 }
 else
 {
 if (!strncmp(ps, "lt;", 3))
 {
 ps += 3;
 ch = '<';
 }
 else if (!strncmp(ps, "gt;", 3))
 {
 ps += 3;
 ch = '>';
 }
 else if (!strncmp(ps, "amp;", 4))
 {
 ps += 4;
 ch = '&';
 }
 else if (!strncmp(ps, "apos;", 5))
 {
 ps += 5;
 ch = '\'';
 }
 else if (!strncmp(ps, "quot;", 5))
 {
 ps += 5;
 ch = '"';
 }
 else
 {
 ch = 0;
 }
 if (ch)
 {
 content.push_back((char)ch);
 }
 }
 }
 else
 {
 content.push_back((char)ch);
 }
 }
}

std::string xml_unescape_string(const char *data, int64_t len)
{
 std::string content;
 xml_unescape_string(data, len, content);
 return content;
}

zcc_namespace_end;