/*
  * Sun Rasterfile (.sun/.ras/im{1,8,24}/.sunras) image decoder
  * Copyright (c) 2007, 2008 Ivo van Poorten
  *
  * 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
  */
 

 #include "libavutil/intreadwrite.h"

 #include "libavutil/imgutils.h"

 #include "avcodec.h"
 
 #define RT_OLD          0
 #define RT_STANDARD     1
 #define RT_BYTE_ENCODED 2
 #define RT_FORMAT_RGB   3
 #define RT_FORMAT_TIFF  4
 #define RT_FORMAT_IFF   5
 
 typedef struct SUNRASTContext {
     AVFrame picture;
 } SUNRASTContext;
 

 static av_cold int sunrast_init(AVCodecContext *avctx) {

     SUNRASTContext *s = avctx->priv_data;
 
     avcodec_get_frame_defaults(&s->picture);
     avctx->coded_frame= &s->picture;
 
     return 0;
 }
 
 static int sunrast_decode_frame(AVCodecContext *avctx, void *data,

                                 int *data_size, AVPacket *avpkt) {
     const uint8_t *buf = avpkt->data;

     const uint8_t *buf_end = avpkt->data + avpkt->size;

     SUNRASTContext * const s = avctx->priv_data;
     AVFrame *picture = data;
     AVFrame * const p = &s->picture;
     unsigned int w, h, depth, type, maptype, maplength, stride, x, y, len, alen;

     uint8_t *ptr;
     const uint8_t *bufstart = buf;

     if (avpkt->size < 32)
         return AVERROR_INVALIDDATA;
 

     if (AV_RB32(buf) != 0x59a66a95) {
         av_log(avctx, AV_LOG_ERROR, "this is not sunras encoded data\n");
         return -1;
     }
 
     w         = AV_RB32(buf+4);
     h         = AV_RB32(buf+8);
     depth     = AV_RB32(buf+12);
     type      = AV_RB32(buf+20);
     maptype   = AV_RB32(buf+24);
     maplength = AV_RB32(buf+28);

     buf      += 32;

     if (type < RT_OLD || type > RT_FORMAT_IFF) {
         av_log(avctx, AV_LOG_ERROR, "invalid (compression) type\n");

         return -1;
     }

     if (av_image_check_size(w, h, 0, avctx)) {
         av_log(avctx, AV_LOG_ERROR, "invalid image size\n");

         return -1;
     }
     if (maptype & ~1) {
         av_log(avctx, AV_LOG_ERROR, "invalid colormap type\n");
         return -1;
     }
 

     if (type == RT_FORMAT_TIFF || type == RT_FORMAT_IFF) {
         av_log(avctx, AV_LOG_ERROR, "unsupported (compression) type\n");
         return -1;
     }

 
     switch (depth) {
         case 1:
             avctx->pix_fmt = PIX_FMT_MONOWHITE;
             break;
         case 8:
             avctx->pix_fmt = PIX_FMT_PAL8;
             break;
         case 24:

             avctx->pix_fmt = (type == RT_FORMAT_RGB) ? PIX_FMT_RGB24 : PIX_FMT_BGR24;

             break;
         default:
             av_log(avctx, AV_LOG_ERROR, "invalid depth\n");
             return -1;
     }
 
     if (p->data[0])
         avctx->release_buffer(avctx, p);
 
     if (w != avctx->width || h != avctx->height)
         avcodec_set_dimensions(avctx, w, h);
     if (avctx->get_buffer(avctx, p) < 0) {
         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
         return -1;
     }
 

     p->pict_type = AV_PICTURE_TYPE_I;

     if (buf_end - buf < maplength)
         return AVERROR_INVALIDDATA;
 

     if (depth != 8 && maplength) {
         av_log(avctx, AV_LOG_WARNING, "useless colormap found or file is corrupted, trying to recover\n");
 
     } else if (depth == 8) {
         unsigned int len = maplength / 3;
 
         if (!maplength) {
             av_log(avctx, AV_LOG_ERROR, "colormap expected\n");
             return -1;
         }
         if (maplength % 3 || maplength > 768) {
             av_log(avctx, AV_LOG_WARNING, "invalid colormap length\n");
             return -1;
         }
 
         ptr = p->data[1];
         for (x=0; x<len; x++, ptr+=4)

             *(uint32_t *)ptr = (0xFF<<24) + (buf[x]<<16) + (buf[len+x]<<8) + buf[len+len+x];

     }
 
     buf += maplength;
 
     ptr    = p->data[0];
     stride = p->linesize[0];
 
     /* scanlines are aligned on 16 bit boundaries */
     len  = (depth * w + 7) >> 3;
     alen = len + (len&1);
 
     if (type == RT_BYTE_ENCODED) {
         int value, run;
         uint8_t *end = ptr + h*stride;
 
         x = 0;

         while (ptr != end && buf < buf_end) {

             run = 1;

             if (buf_end - buf < 1)
                 return AVERROR_INVALIDDATA;
 

             if ((value = *buf++) == 0x80) {
                 run = *buf++ + 1;
                 if (run != 1)
                     value = *buf++;
             }
             while (run--) {
                 if (x < len)
                     ptr[x] = value;
                 if (++x >= alen) {
                     x = 0;
                     ptr += stride;
                     if (ptr == end)
                         break;
                 }
             }
         }
     } else {
         for (y=0; y<h; y++) {

             if (buf_end - buf < len)
                 break;

             memcpy(ptr, buf, len);
             ptr += stride;
             buf += alen;
         }
     }
 
     *picture = s->picture;
     *data_size = sizeof(AVFrame);
 
     return buf - bufstart;
 }
 

 static av_cold int sunrast_end(AVCodecContext *avctx) {

     SUNRASTContext *s = avctx->priv_data;
 
     if(s->picture.data[0])
         avctx->release_buffer(avctx, &s->picture);
 
     return 0;
 }
 

 AVCodec ff_sunrast_decoder = {

     .name           = "sunrast",
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = CODEC_ID_SUNRAST,
     .priv_data_size = sizeof(SUNRASTContext),
     .init           = sunrast_init,
     .close          = sunrast_end,
     .decode         = sunrast_decode_frame,
     .capabilities   = CODEC_CAP_DR1,

     .long_name = NULL_IF_CONFIG_SMALL("Sun Rasterfile image"),

 };