/*
  * Binary text demuxer
  * eXtended BINary text (XBIN) demuxer
  * Artworx Data Format demuxer
  * iCEDraw File demuxer
  * Copyright (c) 2010 Peter Ross <pross@xvid.org>
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg 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
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /**
  * @file
  * Binary text demuxer
  * eXtended BINary text (XBIN) demuxer
  * Artworx Data Format demuxer
  * iCEDraw File demuxer
  */
 
 #include "libavutil/intreadwrite.h"
 #include "avformat.h"

 #include "internal.h"

 #include "sauce.h"
 #include "libavcodec/bintext.h"
 
 #define LINE_RATE 6000 /** characters per second */
 
 typedef struct {
     int chars_per_frame;
     uint64_t fsize;  /**< file size less metadata buffer */
 } BinDemuxContext;
 
 #if CONFIG_BINTEXT_DEMUXER | CONFIG_ADF_DEMUXER | CONFIG_IDF_DEMUXER
 /**
  * Given filesize and width, calculate height (assume font_height of 16)
  */
 static void calculate_height(AVCodecContext *avctx, uint64_t fsize)
 {
     avctx->height = (fsize / ((avctx->width>>3)*2)) << 4;
 }
 #endif
 
 #if CONFIG_BINTEXT_DEMUXER
 static const uint8_t next_magic[]={
     0x1A, 0x1B, '[', '0', ';', '3', '0', ';', '4', '0', 'm', 'N', 'E', 'X', 'T', 0x00
 };
 
 static int next_tag_read(AVFormatContext *avctx, uint64_t *fsize)
 {

     AVIOContext *pb = avctx->pb;

     char buf[36];
     int len;

     uint64_t start_pos = avio_size(pb) - 256;

     avio_seek(pb, start_pos, SEEK_SET);

     if (avio_read(pb, buf, sizeof(next_magic)) != sizeof(next_magic))

         return -1;
     if (memcmp(buf, next_magic, sizeof(next_magic)))
         return -1;

     if (avio_r8(pb) != 0x01)

         return -1;
 
     *fsize -= 256;
 
 #define GET_EFI2_META(name,size) \

     len = avio_r8(pb); \

     if (len < 1 || len > size) \
         return -1; \

     if (avio_read(pb, buf, size) == size && *buf) { \

         buf[len] = 0; \

         av_dict_set(&avctx->metadata, name, buf, 0); \

     }
 
     GET_EFI2_META("filename",  12)
     GET_EFI2_META("author",    20)
     GET_EFI2_META("publisher", 20)
     GET_EFI2_META("title",     35)
 
     return 0;
 }
 
 static void predict_width(AVCodecContext *avctx, uint64_t fsize, int got_width)
 {
     /** attempt to guess width */
     if (!got_width)
         avctx->width = fsize > 4000 ? (160<<3) : (80<<3);
 }
 
 static AVStream * init_stream(AVFormatContext *s,
                               AVFormatParameters *ap)
 {
     BinDemuxContext *bin = s->priv_data;

     AVStream *st = avformat_new_stream(s, NULL);

     if (!st)
         return NULL;
     st->codec->codec_tag   = 0;
     st->codec->codec_type  = AVMEDIA_TYPE_VIDEO;
 
     if (!ap->time_base.num) {

         avpriv_set_pts_info(st, 60, 1, 25);

     } else {

         avpriv_set_pts_info(st, 60, ap->time_base.num, ap->time_base.den);

     }
 
     /* simulate tty display speed */
     bin->chars_per_frame = FFMAX(av_q2d(st->time_base) * (ap->sample_rate ? ap->sample_rate : LINE_RATE), 1);
 
     st->codec->width  = ap->width  ? ap->width  : (80<<3);
     st->codec->height = ap->height ? ap->height : (25<<4);
     return st;
 }
 
 static int bintext_read_header(AVFormatContext *s,
                                AVFormatParameters *ap)
 {
     BinDemuxContext *bin = s->priv_data;

     AVIOContext *pb = s->pb;

 
     AVStream *st = init_stream(s, ap);
     if (!st)
         return AVERROR(ENOMEM);
     st->codec->codec_id    = CODEC_ID_BINTEXT;
 
     st->codec->extradata_size = 2;
     st->codec->extradata = av_malloc(st->codec->extradata_size);
     if (!st->codec->extradata)
         return AVERROR(ENOMEM);
     st->codec->extradata[0] = 16;
     st->codec->extradata[1] = 0;
 

     if (pb->seekable) {

         int got_width = 0;

         bin->fsize = avio_size(pb);

         if (ff_sauce_read(s, &bin->fsize, &got_width, 0) < 0)
             next_tag_read(s, &bin->fsize);
         if (!ap->width)
             predict_width(st->codec, bin->fsize, got_width);
         if (!ap->height)
             calculate_height(st->codec, bin->fsize);

         avio_seek(pb, 0, SEEK_SET);

     }
     return 0;
 };
 #endif /* CONFIG_BINTEXT_DEMUXER */
 
 #if CONFIG_XBIN_DEMUXER
 static int xbin_probe(AVProbeData *p)
 {
     const uint8_t *d = p->buf;
 
     if (AV_RL32(d) == MKTAG('X','B','I','N') && d[4] == 0x1A &&
         AV_RL16(d+5) > 0 && AV_RL16(d+5) <= 160 &&
         d[9] > 0 && d[9] <= 32)
         return AVPROBE_SCORE_MAX;
     return 0;
 }
 
 static int xbin_read_header(AVFormatContext *s,
                            AVFormatParameters *ap)
 {
     BinDemuxContext *bin = s->priv_data;

     AVIOContext *pb = s->pb;

     char fontheight, flags;
 
     AVStream *st = init_stream(s, ap);
     if (!st)
         return AVERROR(ENOMEM);
 

     avio_skip(pb, 5);

     st->codec->width   = avio_rl16(pb)<<3;
     st->codec->height  = avio_rl16(pb);

     fontheight         = avio_r8(pb);

     st->codec->height *= fontheight;

     flags              = avio_r8(pb);

 
     st->codec->extradata_size = 2;
     if ((flags & BINTEXT_PALETTE))
         st->codec->extradata_size += 48;
     if ((flags & BINTEXT_FONT))
         st->codec->extradata_size += fontheight * (flags & 0x10 ? 512 : 256);
     st->codec->codec_id    = flags & 4 ? CODEC_ID_XBIN : CODEC_ID_BINTEXT;
 

     st->codec->extradata = av_malloc(st->codec->extradata_size);

     if (!st->codec->extradata)
         return AVERROR(ENOMEM);
     st->codec->extradata[0] = fontheight;
     st->codec->extradata[1] = flags;

     if (avio_read(pb, st->codec->extradata + 2, st->codec->extradata_size - 2) < 0)

         return AVERROR(EIO);
 

     if (pb->seekable) {

         bin->fsize = avio_size(pb) - 9 - st->codec->extradata_size;

         ff_sauce_read(s, &bin->fsize, NULL, 0);

         avio_seek(pb, 9 + st->codec->extradata_size, SEEK_SET);

     }
 
     return 0;
 }
 #endif /* CONFIG_XBIN_DEMUXER */
 
 #if CONFIG_ADF_DEMUXER
 static int adf_read_header(AVFormatContext *s,
                            AVFormatParameters *ap)
 {
     BinDemuxContext *bin = s->priv_data;

     AVIOContext *pb = s->pb;

     AVStream *st;
 

     if (avio_r8(pb) != 1)

         return AVERROR_INVALIDDATA;
 
     st = init_stream(s, ap);
     if (!st)
         return AVERROR(ENOMEM);
     st->codec->codec_id    = CODEC_ID_BINTEXT;
 
     st->codec->extradata_size = 2 + 48 + 4096;
     st->codec->extradata = av_malloc(st->codec->extradata_size);
     if (!st->codec->extradata)
         return AVERROR(ENOMEM);
     st->codec->extradata[0] = 16;
     st->codec->extradata[1] = BINTEXT_PALETTE|BINTEXT_FONT;
 

     if (avio_read(pb, st->codec->extradata + 2, 24) < 0)

         return AVERROR(EIO);

     avio_skip(pb, 144);

     if (avio_read(pb, st->codec->extradata + 2 + 24, 24) < 0)

         return AVERROR(EIO);

     if (avio_read(pb, st->codec->extradata + 2 + 48, 4096) < 0)

         return AVERROR(EIO);
 

     if (pb->seekable) {

         int got_width = 0;

         bin->fsize = avio_size(pb) - 1 - 192 - 4096;

         st->codec->width = 80<<3;
         ff_sauce_read(s, &bin->fsize, &got_width, 0);
         if (!ap->height)
             calculate_height(st->codec, bin->fsize);

         avio_seek(pb, 1 + 192 + 4096, SEEK_SET);

     }
     return 0;
 }
 #endif /* CONFIG_ADF_DEMUXER */
 
 #if CONFIG_IDF_DEMUXER
 static const uint8_t idf_magic[] = {
     0x04, 0x31, 0x2e, 0x34, 0x00, 0x00, 0x00, 0x00, 0x4f, 0x00, 0x15, 0x00
 };
 
 static int idf_probe(AVProbeData *p)
 {

     if (p->buf_size < sizeof(idf_magic))
         return 0;
     if (!memcmp(p->buf, idf_magic, sizeof(idf_magic)))

         return AVPROBE_SCORE_MAX;
     return 0;
 }
 
 static int idf_read_header(AVFormatContext *s,
                            AVFormatParameters *ap)
 {
     BinDemuxContext *bin = s->priv_data;

     AVIOContext *pb = s->pb;

     AVStream *st;
     int got_width = 0;
 

     if (!pb->seekable)

         return AVERROR(EIO);
 
     st = init_stream(s, ap);
     if (!st)
         return AVERROR(ENOMEM);
     st->codec->codec_id    = CODEC_ID_IDF;
 
     st->codec->extradata_size = 2 + 48 + 4096;
     st->codec->extradata = av_malloc(st->codec->extradata_size);
     if (!st->codec->extradata)
         return AVERROR(ENOMEM);
     st->codec->extradata[0] = 16;
     st->codec->extradata[1] = BINTEXT_PALETTE|BINTEXT_FONT;
 

     avio_seek(pb, avio_size(pb) - 4096 - 48, SEEK_SET);

     if (avio_read(pb, st->codec->extradata + 2 + 48, 4096) < 0)

         return AVERROR(EIO);

     if (avio_read(pb, st->codec->extradata + 2, 48) < 0)

         return AVERROR(EIO);
 

     bin->fsize = avio_size(pb) - 12 - 4096 - 48;

     ff_sauce_read(s, &bin->fsize, &got_width, 0);
     if (!ap->height)
         calculate_height(st->codec, bin->fsize);

     avio_seek(pb, 12, SEEK_SET);

     return 0;
 }
 #endif /* CONFIG_IDF_DEMUXER */
 
 static int read_packet(AVFormatContext *s,
                            AVPacket *pkt)
 {
     BinDemuxContext *bin = s->priv_data;
 
     if (bin->fsize > 0) {
         if (av_get_packet(s->pb, pkt, bin->fsize) < 0)
             return AVERROR(EIO);
         bin->fsize = -1; /* done */
     } else if (!bin->fsize) {
         if (url_feof(s->pb))
             return AVERROR(EIO);
         if (av_get_packet(s->pb, pkt, bin->chars_per_frame) < 0)
             return AVERROR(EIO);
     } else {
         return AVERROR(EIO);
     }
 
     pkt->flags |= AV_PKT_FLAG_KEY;
     return 0;
 }
 
 #if CONFIG_BINTEXT_DEMUXER
 AVInputFormat ff_bintext_demuxer = {

     .name           = "bin",
     .long_name      = NULL_IF_CONFIG_SMALL("Binary text"),
     .priv_data_size = sizeof(BinDemuxContext),
     .read_header    = bintext_read_header,
     .read_packet    = read_packet,
     .extensions     = "bin",

 };
 #endif
 
 #if CONFIG_XBIN_DEMUXER
 AVInputFormat ff_xbin_demuxer = {

     .name           = "xbin",
     .long_name      = NULL_IF_CONFIG_SMALL("eXtended BINary text (XBIN)"),
     .priv_data_size = sizeof(BinDemuxContext),
     .read_probe     = xbin_probe,
     .read_header    = xbin_read_header,
     .read_packet    = read_packet,

 };
 #endif
 
 #if CONFIG_ADF_DEMUXER
 AVInputFormat ff_adf_demuxer = {

     .name           = "adf",
     .long_name      = NULL_IF_CONFIG_SMALL("Artworx Data Format"),
     .priv_data_size = sizeof(BinDemuxContext),
     .read_header    = adf_read_header,
     .read_packet    = read_packet,
     .extensions     = "adf",

 };
 #endif
 
 #if CONFIG_IDF_DEMUXER
 AVInputFormat ff_idf_demuxer = {

     .name           = "idf",
     .long_name      = NULL_IF_CONFIG_SMALL("iCE Draw File"),
     .priv_data_size = sizeof(BinDemuxContext),
     .read_probe     = idf_probe,
     .read_header    = idf_read_header,
     .read_packet    = read_packet,
     .extensions     = "idf",

 };
 #endif