GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/pnm.c Lines: 107 148 72.3 %
Date: 2021-04-20 04:37:23 Branches: 90 160 56.2 %

Line Branch Exec Source
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/*
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 * PNM image format
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 * Copyright (c) 2002, 2003 Fabrice Bellard
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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 <stdlib.h>
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#include <string.h>
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#include "libavutil/avassert.h"
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#include "libavutil/imgutils.h"
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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 "pnm.h"
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241679
static inline int pnm_space(int c)
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{
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241679
    return c == ' ' || c == '\n' || c == '\r' || c == '\t';
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}
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47983
static void pnm_get(PNMContext *sc, char *str, int buf_size)
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{
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    char *s;
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    int c;
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47983
    uint8_t *bs  = sc->bytestream;
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47983
    const uint8_t *end = sc->bytestream_end;
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    /* skip spaces and comments */
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47985
    while (bs < end) {
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47985
        c = *bs++;
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47985
        if (c == '#')  {
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90
            while (c != '\n' && bs < end) {
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88
                c = *bs++;
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            }
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47983
        } else if (!pnm_space(c)) {
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47983
            break;
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        }
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    }
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47983
    s = str;
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181812
    while (bs < end && !pnm_space(c) && (s - str) < buf_size - 1) {
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133829
        *s++ = c;
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133829
        c = *bs++;
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    }
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47983
    *s = '\0';
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47983
    sc->bytestream = bs;
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47983
}
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11893
int ff_pnm_decode_header(AVCodecContext *avctx, PNMContext * const s)
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{
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    char buf1[32], tuple_type[32];
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    int h, w, depth, maxval;
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    int ret;
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11893
    if (s->bytestream_end - s->bytestream < 3 ||
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11884
        s->bytestream[0] != 'P' ||
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11884
        (s->bytestream[1] < '1' ||
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11884
         s->bytestream[1] > '7' &&
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         s->bytestream[1] != 'f' &&
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         s->bytestream[1] != 'F')) {
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9
        s->bytestream += s->bytestream_end > s->bytestream;
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9
        s->bytestream += s->bytestream_end > s->bytestream;
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9
        return AVERROR_INVALIDDATA;
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    }
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11884
    pnm_get(s, buf1, sizeof(buf1));
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11884
    s->type= buf1[1]-'0';
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11884
    if (buf1[1] == 'F') {
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        avctx->pix_fmt = AV_PIX_FMT_GBRPF32;
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11884
    } else if (buf1[1] == 'f') {
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        avctx->pix_fmt = AV_PIX_FMT_GRAYF32;
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11884
    } else if (s->type==1 || s->type==4) {
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225
        avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
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11659
    } else if (s->type==2 || s->type==5) {
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11340
        if (avctx->codec_id == AV_CODEC_ID_PGMYUV)
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10981
            avctx->pix_fmt = AV_PIX_FMT_YUV420P;
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        else
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            avctx->pix_fmt = AV_PIX_FMT_GRAY8;
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    } else if (s->type==3 || s->type==6) {
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        avctx->pix_fmt = AV_PIX_FMT_RGB24;
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    } else if (s->type==7) {
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        w      = -1;
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        h      = -1;
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        maxval = -1;
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        depth  = -1;
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        tuple_type[0] = '\0';
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        for (;;) {
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504
            pnm_get(s, buf1, sizeof(buf1));
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504
            if (!strcmp(buf1, "WIDTH")) {
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                pnm_get(s, buf1, sizeof(buf1));
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                w = strtol(buf1, NULL, 10);
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420
            } else if (!strcmp(buf1, "HEIGHT")) {
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                pnm_get(s, buf1, sizeof(buf1));
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                h = strtol(buf1, NULL, 10);
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            } else if (!strcmp(buf1, "DEPTH")) {
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                pnm_get(s, buf1, sizeof(buf1));
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                depth = strtol(buf1, NULL, 10);
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            } else if (!strcmp(buf1, "MAXVAL")) {
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                pnm_get(s, buf1, sizeof(buf1));
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84
                maxval = strtol(buf1, NULL, 10);
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            } else if (!strcmp(buf1, "TUPLTYPE") ||
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                       /* libavcodec used to write invalid files */
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                       !strcmp(buf1, "TUPLETYPE")) {
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                pnm_get(s, tuple_type, sizeof(tuple_type));
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84
            } else if (!strcmp(buf1, "ENDHDR")) {
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                break;
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            } else {
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                return AVERROR_INVALIDDATA;
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            }
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        }
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        if (!pnm_space(s->bytestream[-1]))
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            return AVERROR_INVALIDDATA;
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        /* check that all tags are present */
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        if (w <= 0 || h <= 0 || maxval <= 0 || maxval > UINT16_MAX || depth <= 0 || tuple_type[0] == '\0' ||
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            av_image_check_size(w, h, 0, avctx) || s->bytestream >= s->bytestream_end)
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            return AVERROR_INVALIDDATA;
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        ret = ff_set_dimensions(avctx, w, h);
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84
        if (ret < 0)
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            return ret;
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        s->maxval     = maxval;
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84
        if (depth == 1) {
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            if (maxval == 1) {
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                avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
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            } else if (maxval < 256) {
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                avctx->pix_fmt = AV_PIX_FMT_GRAY8;
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            } else {
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                avctx->pix_fmt = AV_PIX_FMT_GRAY16;
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            }
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        } else if (depth == 2) {
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            if (maxval < 256) {
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                avctx->pix_fmt = AV_PIX_FMT_GRAY8A;
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            } else {
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                avctx->pix_fmt = AV_PIX_FMT_YA16;
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            }
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        } else if (depth == 3) {
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            if (maxval < 256) {
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14
                avctx->pix_fmt = AV_PIX_FMT_RGB24;
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            } else {
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                avctx->pix_fmt = AV_PIX_FMT_RGB48;
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            }
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        } else if (depth == 4) {
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14
            if (maxval < 256) {
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14
                avctx->pix_fmt = AV_PIX_FMT_RGBA;
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            } else {
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                avctx->pix_fmt = AV_PIX_FMT_RGBA64;
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            }
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        } else {
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            return AVERROR_INVALIDDATA;
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        }
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84
        return 0;
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    } else {
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        av_assert0(0);
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    }
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11800
    pnm_get(s, buf1, sizeof(buf1));
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11800
    w = atoi(buf1);
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11800
    pnm_get(s, buf1, sizeof(buf1));
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11800
    h = atoi(buf1);
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11800
    if(w <= 0 || h <= 0 || av_image_check_size(w, h, 0, avctx) || s->bytestream >= s->bytestream_end)
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        return AVERROR_INVALIDDATA;
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11800
    ret = ff_set_dimensions(avctx, w, h);
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11800
    if (ret < 0)
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        return ret;
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11800
    if (avctx->pix_fmt == AV_PIX_FMT_GBRPF32 || avctx->pix_fmt == AV_PIX_FMT_GRAYF32) {
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        pnm_get(s, buf1, sizeof(buf1));
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        if (av_sscanf(buf1, "%f", &s->scale) != 1 || s->scale == 0.0 || !isfinite(s->scale)) {
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            av_log(avctx, AV_LOG_ERROR, "Invalid scale.\n");
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            return AVERROR_INVALIDDATA;
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        }
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        s->endian = s->scale < 0.f;
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        s->scale = fabsf(s->scale);
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        s->maxval = (1ULL << 32) - 1;
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11800
    } else if (avctx->pix_fmt != AV_PIX_FMT_MONOWHITE && avctx->pix_fmt != AV_PIX_FMT_MONOBLACK) {
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11575
        pnm_get(s, buf1, sizeof(buf1));
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11575
        s->maxval = atoi(buf1);
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11575
        if (s->maxval <= 0 || s->maxval > UINT16_MAX) {
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            av_log(avctx, AV_LOG_ERROR, "Invalid maxval: %d\n", s->maxval);
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            s->maxval = 255;
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        }
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11575
        if (s->maxval >= 256) {
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            if (avctx->pix_fmt == AV_PIX_FMT_GRAY8) {
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                avctx->pix_fmt = AV_PIX_FMT_GRAY16;
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            } else if (avctx->pix_fmt == AV_PIX_FMT_RGB24) {
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                avctx->pix_fmt = AV_PIX_FMT_RGB48;
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            } else if (avctx->pix_fmt == AV_PIX_FMT_YUV420P && s->maxval < 65536) {
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                if (s->maxval < 512)
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                    avctx->pix_fmt = AV_PIX_FMT_YUV420P9;
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                else if (s->maxval < 1024)
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                    avctx->pix_fmt = AV_PIX_FMT_YUV420P10;
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                else
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                    avctx->pix_fmt = AV_PIX_FMT_YUV420P16;
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            } else {
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                av_log(avctx, AV_LOG_ERROR, "Unsupported pixel format\n");
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                avctx->pix_fmt = AV_PIX_FMT_NONE;
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                return AVERROR_INVALIDDATA;
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            }
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        }
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    }else
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        s->maxval=1;
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11800
    if (!pnm_space(s->bytestream[-1]))
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        return AVERROR_INVALIDDATA;
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    /* more check if YUV420 */
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11800
    if ((av_pix_fmt_desc_get(avctx->pix_fmt)->flags & AV_PIX_FMT_FLAG_PLANAR) &&
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10981
        avctx->pix_fmt != AV_PIX_FMT_GBRPF32) {
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10981
        if ((avctx->width & 1) != 0)
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            return AVERROR_INVALIDDATA;
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10981
        h = (avctx->height * 2);
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10981
        if ((h % 3) != 0)
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            return AVERROR_INVALIDDATA;
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10981
        h /= 3;
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10981
        avctx->height = h;
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    }
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11800
    return 0;
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}