1/*
2 * PNM image parser
3 * Copyright (c) 2002, 2003 Fabrice Bellard
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#include "parser.h" //for ParseContext
23#include "pnm.h"
24
25
26static int pnm_parse(AVCodecParserContext *s, AVCodecContext *avctx,
27                     const uint8_t **poutbuf, int *poutbuf_size,
28                     const uint8_t *buf, int buf_size)
29{
30    ParseContext *pc = s->priv_data;
31    PNMContext pnmctx;
32    int next;
33
34    for (; pc->overread > 0; pc->overread--) {
35        pc->buffer[pc->index++]= pc->buffer[pc->overread_index++];
36    }
37retry:
38    if (pc->index) {
39        pnmctx.bytestream_start =
40        pnmctx.bytestream       = pc->buffer;
41        pnmctx.bytestream_end   = pc->buffer + pc->index;
42    } else {
43        pnmctx.bytestream_start =
44        pnmctx.bytestream       = (uint8_t *) buf; /* casts avoid warnings */
45        pnmctx.bytestream_end   = (uint8_t *) buf + buf_size;
46    }
47    if (ff_pnm_decode_header(avctx, &pnmctx) < 0) {
48        if (pnmctx.bytestream < pnmctx.bytestream_end) {
49            if (pc->index) {
50                pc->index = 0;
51            } else {
52                buf++;
53                buf_size--;
54            }
55            goto retry;
56        }
57#if 0
58        if (pc->index && pc->index * 2 + FF_INPUT_BUFFER_PADDING_SIZE < pc->buffer_size && buf_size > pc->index) {
59            memcpy(pc->buffer + pc->index, buf, pc->index);
60            pc->index += pc->index;
61            buf       += pc->index;
62            buf_size  -= pc->index;
63            goto retry;
64        }
65#endif
66        next = END_NOT_FOUND;
67    } else {
68        next = pnmctx.bytestream - pnmctx.bytestream_start
69               + avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
70        if (pnmctx.bytestream_start != buf)
71            next -= pc->index;
72        if (next > buf_size)
73            next = END_NOT_FOUND;
74    }
75
76    if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
77        *poutbuf      = NULL;
78        *poutbuf_size = 0;
79        return buf_size;
80    }
81    *poutbuf      = buf;
82    *poutbuf_size = buf_size;
83    return next;
84}
85
86AVCodecParser pnm_parser = {
87    { CODEC_ID_PGM, CODEC_ID_PGMYUV, CODEC_ID_PPM, CODEC_ID_PBM, CODEC_ID_PAM},
88    sizeof(ParseContext),
89    NULL,
90    pnm_parse,
91    ff_parse_close,
92};
93