/*
  * 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/common.h"

 #include "libavutil/intreadwrite.h"

 #include "libavutil/imgutils.h"

 #include "avcodec.h"

 #include "internal.h"

 #include "sunrast.h"

 
 static int sunrast_decode_frame(AVCodecContext *avctx, void *data,

                                 int *got_frame, AVPacket *avpkt)
 {

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

     AVFrame * const p        = data;

     unsigned int w, h, depth, type, maptype, maplength, stride, x, y, len, alen;

     uint8_t *ptr, *ptr2 = NULL;

     const uint8_t *bufstart = buf;

     int ret;

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

     if (AV_RB32(buf) != RAS_MAGIC) {

         av_log(avctx, AV_LOG_ERROR, "this is not sunras encoded data\n");

         return AVERROR_INVALIDDATA;

     }
 

     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_EXPERIMENTAL) {

         avpriv_request_sample(avctx, "TIFF/IFF/EXPERIMENTAL (compression) type");

         return AVERROR_PATCHWELCOME;

     }

     if (type > RT_FORMAT_IFF) {

         av_log(avctx, AV_LOG_ERROR, "invalid (compression) type\n");

         return AVERROR_INVALIDDATA;

     }

     if (maptype == RMT_RAW) {

         avpriv_request_sample(avctx, "Unknown colormap type");

         return AVERROR_PATCHWELCOME;
     }
     if (maptype > RMT_RAW) {

         av_log(avctx, AV_LOG_ERROR, "invalid colormap type\n");

         return AVERROR_INVALIDDATA;

     }
 

     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 = maplength ? AV_PIX_FMT_PAL8 : AV_PIX_FMT_MONOWHITE;

             break;
         case 4:

             avctx->pix_fmt = maplength ? AV_PIX_FMT_PAL8 : AV_PIX_FMT_NONE;

             break;
         case 8:

             avctx->pix_fmt = maplength ? AV_PIX_FMT_PAL8 : AV_PIX_FMT_GRAY8;

             break;
         case 24:

             avctx->pix_fmt = (type == RT_FORMAT_RGB) ? AV_PIX_FMT_RGB24 : AV_PIX_FMT_BGR24;

             break;

         case 32:

             avctx->pix_fmt = (type == RT_FORMAT_RGB) ? AV_PIX_FMT_0RGB : AV_PIX_FMT_0BGR;

             break;

         default:
             av_log(avctx, AV_LOG_ERROR, "invalid depth\n");

             return AVERROR_INVALIDDATA;

     }
 

     ret = ff_set_dimensions(avctx, w, h);
     if (ret < 0)
         return ret;
 

     if ((ret = ff_get_buffer(avctx, p, 0)) < 0)

         return ret;

     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 (maplength) {

         unsigned int len = maplength / 3;
 
         if (maplength % 3 || maplength > 768) {
             av_log(avctx, AV_LOG_WARNING, "invalid colormap length\n");

             return AVERROR_INVALIDDATA;

         }
 
         ptr = p->data[1];

         for (x = 0; x < len; x++, ptr += 4)

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

     }
 
     buf += maplength;
 

     if (maplength && depth < 8) {

         ptr = ptr2 = av_malloc_array((w + 15), h);

         if (!ptr)
             return AVERROR(ENOMEM);
         stride = (w + 15 >> 3) * depth;
     } else {

     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++) == RLE_TRIGGER) {

                 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;
         }
     }

     if (avctx->pix_fmt == AV_PIX_FMT_PAL8 && depth < 8) {

         uint8_t *ptr_free = ptr2;
         ptr = p->data[0];
         for (y=0; y<h; y++) {
             for (x = 0; x < (w + 7 >> 3) * depth; x++) {
                 if (depth == 1) {
                     ptr[8*x]   = ptr2[x] >> 7;
                     ptr[8*x+1] = ptr2[x] >> 6 & 1;
                     ptr[8*x+2] = ptr2[x] >> 5 & 1;
                     ptr[8*x+3] = ptr2[x] >> 4 & 1;
                     ptr[8*x+4] = ptr2[x] >> 3 & 1;
                     ptr[8*x+5] = ptr2[x] >> 2 & 1;
                     ptr[8*x+6] = ptr2[x] >> 1 & 1;
                     ptr[8*x+7] = ptr2[x]      & 1;
                 } else {
                     ptr[2*x]   = ptr2[x] >> 4;
                     ptr[2*x+1] = ptr2[x] & 0xF;
                 }
             }
             ptr  += p->linesize[0];
             ptr2 += (w + 15 >> 3) * depth;
         }
         av_freep(&ptr_free);
     }

     *got_frame = 1;

 
     return buf - bufstart;
 }
 

 AVCodec ff_sunrast_decoder = {

     .name           = "sunrast",

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

     .type           = AVMEDIA_TYPE_VIDEO,

     .id             = AV_CODEC_ID_SUNRAST,

     .decode         = sunrast_decode_frame,

     .capabilities   = AV_CODEC_CAP_DR1,

 };