/*
 * Mp3Splt -- Utility for mp3/ogg splitting without decoding
 *
 * Copyright (c) 2002-2005 M. Trotta - <matteo.trotta@lib.unimib.it>
 *
 * http://mp3splt.sourceforge.net
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/stat.h>
#include <dirent.h>

#include "wrap.h"
#include "mp3.h"
#include "splt.h"

#if !HAVE_FSEEKO
#define fseeko fseek
#define ftello ftell
#endif

const unsigned char albumwraphead[22] = {
	0xa, 0x23, 0x54, 0x49, 0x54, 0x32, 0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x41, 0x6c, 0x62, 0x75, 0x6d, 0x57, 0x72, 0x61, 0x70,
};

static const unsigned long crctab[256] = {
	0x00000000, 0x77073096, 0xee0e612c, 0x990951ba,
	0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
	0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
	0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
	0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
	0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
	0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,
	0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
	0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
	0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
	0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940,
	0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
	0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116,
	0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
	0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
	0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
	0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a,
	0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
	0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818,
	0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
	0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
	0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
	0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c,
	0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
	0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
	0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
	0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
	0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
	0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086,
	0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
	0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4,
	0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
	0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
	0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
	0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
	0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
	0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe,
	0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
	0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
	0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
	0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252,
	0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
	0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60,
	0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
	0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
	0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
	0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04,
	0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
	0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a,
	0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
	0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
	0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
	0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e,
	0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
	0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
	0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
	0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
	0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
	0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0,
	0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
	0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6,
	0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
	0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
	0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d,
};

unsigned long c_crc (FILE *in, off_t begin, off_t end)
{
	register unsigned long crc;
	int c;

    	crc = 0xFFFFFFFF;

        if (fseeko(in, begin, SEEK_SET) == -1) {
		perror("fseeko");
		exit(1);
	}

    	while(begin++ < end) {
		c = fgetc(in);
        	crc = ((crc >> 8) & 0x00FFFFFF) ^ crctab[(crc ^ c) & 0xFF];
	}

    	return (crc ^ 0xFFFFFFFF);
}

void failed (char *s)
{
	fflush(stdout);
	fprintf(stderr, "%s", s);
	error("file is damaged or not complete!",133);
}

int dewrap (FILE *file_input, int listonly, int quiet, char *dir) {

	short albumwrap=0, mp3wrap=0;
	int wrapfiles=0, i, j, k=0;
	unsigned char c, *ptr, filename[512];
	off_t begin=0, end=0, len, id3offset;
	char junk[384];

	len = flength(file_input);
	if (len == -1)
		error("can't determine file length! (file too big?)",134);
	id3offset = getid3v2(file_input, 0);
	if (fseeko(file_input, id3offset, SEEK_SET)==-1)
		return -1;
	for (i=0; i<16384; i++) {
		if (feof(file_input))
			return -1;
		if ((id3offset = ftello(file_input))==-1)
			return -1;
		if (fgetc(file_input)=='W')
		  if (fgetc(file_input)=='R')
		    if (fgetc(file_input)=='A')
		    	if (fgetc(file_input)=='P') {
				mp3wrap = 1;
				break;
			}
	}
	if (!mp3wrap && (id3offset!=0)) {
		if (fseeko (file_input, (off_t) 8, SEEK_SET)==-1)
			return -1;
		albumwrap = 1;
		for (i=0; i<22; i++) {
			if (albumwraphead[i]!=fgetc(file_input)) {
				albumwrap = 0;
				break;
			}
		}
	}
	if (albumwrap || mp3wrap)
	{
		fprintf (stderr, "Detected file created with: ");
		if (mp3wrap) {
			short indexver;
			fprintf (stderr, "Mp3Wrap v. ");
			fprintf (stderr, "%c.", fgetc(file_input));
			fprintf (stderr, "%c\n", fgetc(file_input));
			indexver = fgetc(file_input);
			if (indexver >INDEXVERSION)
				error("this version of mp3splt is too old for this mp3wrap file!\nDownload the latest release at http://mp3splt.sourceforge.net",135);
			wrapfiles = (int) fgetc(file_input);
			if (feof(file_input)) return -1;
			if (indexver > 0x0) {
				unsigned long crc=0, fcrc=0;
				if (getword (file_input, 0, SEEK_CUR, &fcrc)==-1)
					return -1;
				if (!quiet) {
					begin = ftello(file_input);
					if (fseeko(file_input, getid3v1(file_input), SEEK_END)==-1)
						return -1;
					end = ftello(file_input);
					fprintf (stderr, "Check for file integrity: calculating CRC please wait... ");
					crc = c_crc (file_input, begin, end);
					if (crc != fcrc) {
						fprintf (stderr, "BAD\nWARNING: Bad CRC. File might be damaged. Continue anyway? (y/n) ");
						fgets(junk, 32, stdin);
						if (junk[0]!='y')
							error("Aborted.",125);
					}
					else fprintf (stderr, "OK\n");
					if (fseeko(file_input, begin, SEEK_SET)==-1)
						return -1;
				}
			}
		}
		if (albumwrap) {
			fprintf (stderr, "AlbumWrap\n");
			if (fseeko(file_input, (off_t) 0x52d, SEEK_SET)==-1)
				return -1;
			i = 0;
			while (((c=fgetc(file_input))!=0x20) &&(i<384))
				junk[i++] = c;
			junk[i] = '\0';
			wrapfiles = atoi (junk);
		}
		if (wrapfiles<=0)
			error("0 file to wrap or bad wrap index!",136);
		fprintf (stderr, "Total files: %d\n", wrapfiles);
		
		for (i=0; i<wrapfiles; i++) {
			if (i==0) {
				if (mp3wrap) {
					unsigned long w;
					if (getword (file_input, 0, SEEK_CUR, &w)==-1)
						failed("\n");
					begin = (off_t) (w + id3offset);
				}
				if (albumwrap) {
					if (fseeko (file_input, (off_t) ABWINDEXOFFSET, SEEK_SET)==-1)
						failed("\n");
					j = 0;
					while ((c=fgetc(file_input))!='[')
						if (j++ > 32) failed("\n");
					if (fseeko(file_input, (off_t) 3, SEEK_CUR)==-1)
						failed("\n");
					j = 0;
					while ((j<384) && ((c = fgetc(file_input))!='['))
						if (c!='.') junk[j++] = c;
						else k = j;
					junk[j] = '\0';
					begin = (off_t) atol (junk);
					k = j - k;
					if (k<4)
						for (j=0; j<(4-k); j++)
						    begin = begin * 10;
				}
			}
			else begin = end;

			if (mp3wrap) {
				unsigned long w;
				j = 0;
				do {
					c = fgetc(file_input);
					// For files wrapped using windows
					if (c==NDIRCHAR) c=DIRCHAR;
					filename[j++] = c;
				}  while ((c!=0x00)&&(j<512));

				if (getword (file_input, 0, SEEK_CUR, &w) == -1)
					failed("\n");

				end = (off_t) (w + id3offset);

				memset(junk, 0x00, 384);
				ptr = filename;
				while (((ptr = strchr(ptr, DIRCHAR))!=NULL)&&((ptr-filename)<384)) {
					ptr++;
					strncpy(junk, filename, ptr-filename);
					if (!opendir(junk))
#ifdef _WIN32					
					if ((mkdir(junk))==-1) {
#else
					if ((mkdir(junk, 0755))==-1) {
#endif
						perror(junk);
						exit(1);
					}
				}
			}

			if (albumwrap) {
				if (i<wrapfiles-1) {
					if (fseeko (file_input, (off_t) (ABWINDEXOFFSET + (i * ABWLEN)), SEEK_SET)==-1)
						failed("\n");
					j = 0;
					while ((j<384) && ((c = fgetc(file_input))!='['))
						if (c!='.') junk[j++] = c;
						else k = j;
					junk[j] = '\0';
					end = (off_t) atol (junk);
					k = j - k;
					if (k<4)
						for (j=0; j<(4-k); j++)
						   end = end * 10;
					end += begin;
				}
				else end = len;

				if (fseeko (file_input, (off_t) (ABWINDEXOFFSET + (i*ABWLEN)), SEEK_SET)==-1)
					failed("\n");
				j = 0;
				while ((c=fgetc(file_input))!='[')
					if (j++ > 32) failed("\n");
				if (fseeko (file_input, (off_t) 3, SEEK_CUR)==-1)
					failed("\n");
				j = 0;
				while ((c=fgetc(file_input))!='[')
					if (j++ > 32) failed("\n");
				if (fseeko (file_input, (off_t) 3, SEEK_CUR)==-1)
					failed("\n");
				j = 0;
				while (j<=400)
					filename[j++] = fgetc(file_input);
				for (j=400; j>0; j--) {
					if (filename[j]==0x20)
						filename[j]='\0';
					else break;
				}
				filename[j+1] = '\0';
			}

			if (feof(file_input)) failed("\n");
			
			if (listonly)
				fprintf (stdout, "\n%s", filename); // To stdout for easy redirection to file
			else {
				int ret;
				if (dir)
				{
					char temp[512];
					strncpy(temp, filename, 512);
					sprintf(filename, "%s%c%s", dir, DIRCHAR, temp);
				}
				fprintf (stderr, "\n %3d %% -> ", ((i+1)*100)/wrapfiles);
				fprintf (stderr, "%s... ", filename);
				ret = split (filename, file_input, begin, end, 0, NULL, NULL);
				if (ret==0)
					fprintf (stderr, "OK");
				else failed("FAILED\n");
			}
		}
		return 0;
	}
	else return -1;
}