/*
 * The copyright in this software is being made available under the 2-clauses
 * BSD License, included below. This software may be subject to other third
 * party and contributor rights, including patent rights, and no such rights
 * are granted under this license.
 *
 * Copyright (c) 2005, Herve Drolon, FreeImage Team
 * 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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 "opj_includes.h"

/* ==========================================================
//   Utility functions
// ==========================================================*/

#ifndef _WIN32
static char*
i2a(unsigned i, char *a, unsigned r)
{
    if (i / r > 0) {
        a = i2a(i / r, a, r);
    }
    *a = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"[i % r];
    return a + 1;
}

/**
 Transforms integer i into an ascii string and stores the result in a;
 string is encoded in the base indicated by r.
 @param i Number to be converted
 @param a String result
 @param r Base of value; must be in the range 2 - 36
 @return Returns a
*/
static char *
_itoa(int i, char *a, int r)
{
    r = ((r < 2) || (r > 36)) ? 10 : r;
    if (i < 0) {
        *a = '-';
        *i2a(-i, a + 1, r) = 0;
    } else {
        *i2a(i, a, r) = 0;
    }
    return a;
}

#endif /* !_WIN32 */

/* ----------------------------------------------------------------------- */

opj_event_mgr_t* OPJ_CALLCONV opj_set_event_mgr(opj_common_ptr cinfo,
        opj_event_mgr_t *event_mgr, void *context)
{
    if (cinfo) {
        opj_event_mgr_t *previous = cinfo->event_mgr;
        cinfo->event_mgr = event_mgr;
        cinfo->client_data = context;
        return previous;
    }

    return NULL;
}

bool opj_event_msg(opj_common_ptr cinfo, int event_type, const char *fmt, ...)
{
#define MSG_SIZE 512 /* 512 bytes should be more than enough for a short message */
    opj_msg_callback msg_handler = NULL;

    opj_event_mgr_t *event_mgr = cinfo->event_mgr;
    if (event_mgr != NULL) {
        switch (event_type) {
        case EVT_ERROR:
            msg_handler = event_mgr->error_handler;
            break;
        case EVT_WARNING:
            msg_handler = event_mgr->warning_handler;
            break;
        case EVT_INFO:
            msg_handler = event_mgr->info_handler;
            break;
        default:
            break;
        }
        if (msg_handler == NULL) {
            return false;
        }
    } else {
        return false;
    }

    if ((fmt != NULL) && (event_mgr != NULL)) {
        va_list arg;
        int str_length, i, j;
        char message[MSG_SIZE];
        memset(message, 0, MSG_SIZE);
        /* initialize the optional parameter list */
        va_start(arg, fmt);
        /* check the length of the format string */
        str_length = (strlen(fmt) > MSG_SIZE) ? MSG_SIZE : strlen(fmt);
        /* parse the format string and put the result in 'message' */
        for (i = 0, j = 0; i < str_length; ++i) {
            if (fmt[i] == '%') {
                if (i + 1 < str_length) {
                    switch (tolower(fmt[i + 1])) {
                    case '%' :
                        message[j++] = '%';
                        break;
                    case 'o' : { /* octal numbers */
                        char tmp[16];
                        _itoa(va_arg(arg, int), tmp, 8);
                        strcat(message, tmp);
                        j += strlen(tmp);
                        ++i;
                        break;
                    }
                    case 'i' : /* decimal numbers */
                    case 'd' : {
                        char tmp[16];
                        _itoa(va_arg(arg, int), tmp, 10);
                        strcat(message, tmp);
                        j += strlen(tmp);
                        ++i;
                        break;
                    }
                    case 'x' : { /* hexadecimal numbers */
                        char tmp[16];
                        _itoa(va_arg(arg, int), tmp, 16);
                        strcat(message, tmp);
                        j += strlen(tmp);
                        ++i;
                        break;
                    }
                    case 's' : { /* strings */
                        char *tmp = va_arg(arg, char*);
                        strcat(message, tmp);
                        j += strlen(tmp);
                        ++i;
                        break;
                    }
                    case 'f' : { /* floats */
                        char tmp[16];
                        double value = va_arg(arg, double);
                        sprintf(tmp, "%f", value);
                        strcat(message, tmp);
                        j += strlen(tmp);
                        ++i;
                        break;
                    }
                    };
                } else {
                    message[j++] = fmt[i];
                }
            } else {
                message[j++] = fmt[i];
            };
        }
        /* deinitialize the optional parameter list */
        va_end(arg);

        /* output the message to the user program */
        msg_handler(message, cinfo->client_data);
    }

    return true;
}