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/* |
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* XBM image format |
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* |
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* Copyright (c) 2012 Paul B Mahol |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "libavutil/avstring.h" |
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#include "avcodec.h" |
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#include "internal.h" |
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#include "mathops.h" |
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560852 |
static int get_nibble(uint8_t x) |
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{ |
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int ret = 255; |
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|
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✓✓ |
560852 |
if (x <= '9') { |
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✓✓ |
440193 |
if (x >= '0') |
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ret = x - '0'; |
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✓✓ |
120659 |
} else if (x >= 'a') { |
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✓✗ |
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if (x <= 'f') |
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ret = x - ('a' - 10); |
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✓✗✓✗
|
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} else if (x >= 'A' && x <= 'F') |
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ret = x - ('A' - 10); |
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return ret; |
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} |
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static int parse_str_int(const uint8_t *p, const uint8_t *end, const uint8_t *key) |
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{ |
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int keylen = strlen(key); |
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const uint8_t *e = end - keylen; |
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✓✓ |
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for(; p < e; p++) { |
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✓✓ |
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if (!memcmp(p, key, keylen)) |
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break; |
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} |
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p += keylen; |
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✓✓ |
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if (p >= end) |
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return INT_MIN; |
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✓✗ |
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for(; p<end; p++) { |
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char *eptr; |
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int64_t ret = strtol(p, &eptr, 10); |
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✓✗ |
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if ((const uint8_t *)eptr != p) |
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return ret; |
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} |
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return INT_MIN; |
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} |
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static int xbm_decode_frame(AVCodecContext *avctx, void *data, |
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int *got_frame, AVPacket *avpkt) |
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{ |
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AVFrame *p = data; |
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int ret, linesize, i, j; |
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int width = 0; |
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int height = 0; |
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const uint8_t *end, *ptr = avpkt->data; |
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const uint8_t *next; |
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uint8_t *dst; |
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avctx->pix_fmt = AV_PIX_FMT_MONOWHITE; |
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end = avpkt->data + avpkt->size; |
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width = parse_str_int(avpkt->data, end, "_width"); |
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height = parse_str_int(avpkt->data, end, "_height"); |
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✓✓ |
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if ((ret = ff_set_dimensions(avctx, width, height)) < 0) |
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return ret; |
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✗✓ |
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if ((ret = ff_get_buffer(avctx, p, 0)) < 0) |
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return ret; |
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// goto start of image data |
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next = memchr(ptr, '{', avpkt->size); |
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✗✓ |
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if (!next) |
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next = memchr(ptr, '(', avpkt->size); |
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✗✓ |
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if (!next) |
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return AVERROR_INVALIDDATA; |
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ptr = next + 1; |
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linesize = (avctx->width + 7) / 8; |
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✓✓ |
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for (i = 0; i < avctx->height; i++) { |
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dst = p->data[0] + i * p->linesize[0]; |
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✓✓ |
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for (j = 0; j < linesize; j++) { |
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uint8_t nib, val; |
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✓✗✓✓
✓✗ |
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while (ptr < end && *ptr != 'x' && *ptr != '$') |
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ptr++; |
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ptr ++; |
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✓✗✓✗
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if (ptr < end && (val = get_nibble(*ptr)) <= 15) { |
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ptr++; |
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✓✗ |
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if ((nib = get_nibble(*ptr)) <= 15) { |
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val = (val << 4) + nib; |
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ptr++; |
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} |
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*dst++ = ff_reverse[val]; |
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✓✓✓✗
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if ((val = get_nibble(*ptr)) <= 15 && j+1 < linesize) { |
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j++; |
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ptr++; |
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✓✗ |
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if ((nib = get_nibble(*ptr)) <= 15) { |
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val = (val << 4) + nib; |
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ptr++; |
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} |
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*dst++ = ff_reverse[val]; |
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} |
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} else { |
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av_log(avctx, AV_LOG_ERROR, |
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"Unexpected data at %.8s.\n", ptr); |
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return AVERROR_INVALIDDATA; |
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} |
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} |
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} |
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p->key_frame = 1; |
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p->pict_type = AV_PICTURE_TYPE_I; |
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*got_frame = 1; |
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return avpkt->size; |
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} |
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AVCodec ff_xbm_decoder = { |
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.name = "xbm", |
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.long_name = NULL_IF_CONFIG_SMALL("XBM (X BitMap) image"), |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = AV_CODEC_ID_XBM, |
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.decode = xbm_decode_frame, |
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.capabilities = AV_CODEC_CAP_DR1, |
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}; |