GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/targa.c Lines: 115 168 68.5 %
Date: 2020-08-13 15:06:06 Branches: 58 100 58.0 %

Line Branch Exec Source
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/*
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 * Targa (.tga) image decoder
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 * Copyright (c) 2006 Konstantin Shishkov
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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/intreadwrite.h"
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#include "libavutil/imgutils.h"
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#include "avcodec.h"
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#include "bytestream.h"
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#include "internal.h"
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#include "targa.h"
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typedef struct TargaContext {
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    GetByteContext gb;
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} TargaContext;
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7392
static uint8_t *advance_line(uint8_t *start, uint8_t *line,
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                             int stride, int *y, int h, int interleave)
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{
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7392
    *y += interleave;
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7392
    if (*y < h) {
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7355
        return line + interleave * stride;
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    } else {
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37
        *y = (*y + 1) & (interleave - 1);
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37
        if (*y && *y < h) {
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            return start + *y * stride;
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        } else {
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37
            return NULL;
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        }
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    }
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}
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12
static int targa_decode_rle(AVCodecContext *avctx, TargaContext *s,
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                            uint8_t *start, int w, int h, int stride,
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                            int bpp, int interleave)
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{
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    int x, y;
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12
    int depth = (bpp + 1) >> 3;
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    int type, count;
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12
    uint8_t *line = start;
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12
    uint8_t *dst  = line;
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60
12
    x = y = count = 0;
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22056
    while (dst) {
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22044
        if (bytestream2_get_bytes_left(&s->gb) <= 0) {
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            av_log(avctx, AV_LOG_ERROR,
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                   "Ran ouf of data before end-of-image\n");
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            return AVERROR_INVALIDDATA;
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        }
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22044
        type  = bytestream2_get_byteu(&s->gb);
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22044
        count = (type & 0x7F) + 1;
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22044
        type &= 0x80;
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22044
        if (!type) {
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            do {
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1284
                int n  = FFMIN(count, w - x);
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1284
                bytestream2_get_buffer(&s->gb, dst, n * depth);
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1284
                count -= n;
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1284
                dst   += n * depth;
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1284
                x     += n;
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1284
                if (x == w) {
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512
                    x    = 0;
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512
                    dst = line = advance_line(start, line, stride, &y, h, interleave);
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                }
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1284
            } while (dst && count > 0);
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        } else {
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            uint8_t tmp[4];
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20760
            bytestream2_get_buffer(&s->gb, tmp, depth);
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            do {
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20760
                int n  = FFMIN(count, w - x);
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20760
                count -= n;
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20760
                x     += n;
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                do {
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164400
                    memcpy(dst, tmp, depth);
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164400
                    dst += depth;
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164400
                } while (--n);
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20760
                if (x == w) {
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1280
                    x    = 0;
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1280
                    dst = line = advance_line(start, line, stride, &y, h, interleave);
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                }
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20760
            } while (dst && count > 0);
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        }
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    }
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12
    if (count) {
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        av_log(avctx, AV_LOG_ERROR, "Packet went out of bounds\n");
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        return AVERROR_INVALIDDATA;
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    }
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    return 0;
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}
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static int decode_frame(AVCodecContext *avctx,
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                        void *data, int *got_frame,
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                        AVPacket *avpkt)
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{
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37
    TargaContext * const s = avctx->priv_data;
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37
    AVFrame * const p = data;
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    uint8_t *dst;
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    int stride;
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    int idlen, pal, compr, y, w, h, bpp, flags, ret;
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    int first_clr, colors, csize;
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    int interleave;
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37
    bytestream2_init(&s->gb, avpkt->data, avpkt->size);
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    /* parse image header */
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37
    idlen     = bytestream2_get_byte(&s->gb);
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37
    pal       = bytestream2_get_byte(&s->gb);
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37
    compr     = bytestream2_get_byte(&s->gb);
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37
    first_clr = bytestream2_get_le16(&s->gb);
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37
    colors    = bytestream2_get_le16(&s->gb);
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37
    csize     = bytestream2_get_byte(&s->gb);
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37
    bytestream2_skip(&s->gb, 4); /* 2: x, 2: y */
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37
    w         = bytestream2_get_le16(&s->gb);
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37
    h         = bytestream2_get_le16(&s->gb);
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    bpp       = bytestream2_get_byte(&s->gb);
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135
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    flags     = bytestream2_get_byte(&s->gb);
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    if (!pal && (first_clr || colors || csize)) {
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        av_log(avctx, AV_LOG_WARNING, "File without colormap has colormap information set.\n");
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        // specification says we should ignore those value in this case
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        first_clr = colors = csize = 0;
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    }
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143
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    if (bytestream2_get_bytes_left(&s->gb) < idlen + 2*colors) {
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        av_log(avctx, AV_LOG_ERROR,
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                "Not enough data to read header\n");
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        return AVERROR_INVALIDDATA;
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    }
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    // skip identifier if any
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37
    bytestream2_skip(&s->gb, idlen);
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152

37
    switch (bpp) {
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8
    case 8:
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8
        avctx->pix_fmt = ((compr & (~TGA_RLE)) == TGA_BW) ? AV_PIX_FMT_GRAY8 : AV_PIX_FMT_PAL8;
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8
        break;
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4
    case 15:
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    case 16:
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4
        avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
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4
        break;
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21
    case 24:
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        avctx->pix_fmt = AV_PIX_FMT_BGR24;
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21
        break;
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4
    case 32:
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4
        avctx->pix_fmt = AV_PIX_FMT_BGRA;
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4
        break;
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    default:
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        av_log(avctx, AV_LOG_ERROR, "Bit depth %i is not supported\n", bpp);
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        return AVERROR_INVALIDDATA;
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    }
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37
    if (colors && (colors + first_clr) > 256) {
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        av_log(avctx, AV_LOG_ERROR, "Incorrect palette: %i colors with offset %i\n", colors, first_clr);
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        return AVERROR_INVALIDDATA;
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    }
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37
    if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
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        return ret;
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179
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    if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
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        return ret;
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37
    p->pict_type = AV_PICTURE_TYPE_I;
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183
37
    if (flags & TGA_TOPTOBOTTOM) {
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17
        dst = p->data[0];
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17
        stride = p->linesize[0];
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    } else { //image is upside-down
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20
        dst = p->data[0] + p->linesize[0] * (h - 1);
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20
        stride = -p->linesize[0];
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    }
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    interleave = flags & TGA_INTERLEAVE2 ? 2 :
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37
                 flags & TGA_INTERLEAVE4 ? 4 : 1;
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194
37
    if (colors) {
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        int pal_size, pal_sample_size;
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197

4
        switch (csize) {
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        case 32: pal_sample_size = 4; break;
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        case 24: pal_sample_size = 3; break;
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4
        case 16:
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4
        case 15: pal_sample_size = 2; break;
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        default:
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            av_log(avctx, AV_LOG_ERROR, "Palette entry size %i bits is not supported\n", csize);
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            return AVERROR_INVALIDDATA;
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        }
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4
        pal_size = colors * pal_sample_size;
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4
        if (avctx->pix_fmt != AV_PIX_FMT_PAL8) //should not occur but skip palette anyway
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            bytestream2_skip(&s->gb, pal_size);
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        else {
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            int t;
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4
            uint32_t *pal = ((uint32_t *)p->data[1]) + first_clr;
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4
            if (bytestream2_get_bytes_left(&s->gb) < pal_size) {
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                av_log(avctx, AV_LOG_ERROR,
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                       "Not enough data to read palette\n");
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                return AVERROR_INVALIDDATA;
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            }
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4
            switch (pal_sample_size) {
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            case 4:
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                for (t = 0; t < colors; t++)
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                    *pal++ = bytestream2_get_le32u(&s->gb);
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                break;
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            case 3:
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                /* RGB24 */
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                for (t = 0; t < colors; t++)
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                    *pal++ = (0xffU<<24) | bytestream2_get_le24u(&s->gb);
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                break;
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4
            case 2:
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                /* RGB555 */
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1028
                for (t = 0; t < colors; t++) {
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1024
                    uint32_t v = bytestream2_get_le16u(&s->gb);
232
1024
                    v = ((v & 0x7C00) <<  9) |
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1024
                        ((v & 0x03E0) <<  6) |
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1024
                        ((v & 0x001F) <<  3);
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                    /* left bit replication */
236
1024
                    v |= (v & 0xE0E0E0U) >> 5;
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1024
                    *pal++ = (0xffU<<24) | v;
238
                }
239
4
                break;
240
            }
241
4
            p->palette_has_changed = 1;
242
        }
243
    }
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245
37
    if ((compr & (~TGA_RLE)) == TGA_NODATA) {
246
        memset(p->data[0], 0, p->linesize[0] * h);
247
    } else {
248
37
        if (compr & TGA_RLE) {
249
12
            int res = targa_decode_rle(avctx, s, dst, w, h, stride, bpp, interleave);
250
12
            if (res < 0)
251
                return res;
252
        } else {
253
25
            size_t img_size = w * ((bpp + 1) >> 3);
254
            uint8_t *line;
255
25
            if (bytestream2_get_bytes_left(&s->gb) < img_size * h) {
256
                av_log(avctx, AV_LOG_ERROR,
257
                       "Not enough data available for image\n");
258
                return AVERROR_INVALIDDATA;
259
            }
260
261
25
            line = dst;
262
25
            y = 0;
263
            do {
264
5600
                bytestream2_get_buffer(&s->gb, line, img_size);
265
5600
                line = advance_line(dst, line, stride, &y, h, interleave);
266
5600
            } while (line);
267
        }
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269
37
        if (flags & TGA_RIGHTTOLEFT) { // right-to-left, needs horizontal flip
270
            int x;
271
            for (y = 0; y < h; y++) {
272
                void *line = &p->data[0][y * p->linesize[0]];
273
                for (x = 0; x < w >> 1; x++) {
274
                    switch (bpp) {
275
                    case 32:
276
                        FFSWAP(uint32_t, ((uint32_t *)line)[x], ((uint32_t *)line)[w - x - 1]);
277
                        break;
278
                    case 24:
279
                        FFSWAP(uint8_t, ((uint8_t *)line)[3 * x    ], ((uint8_t *)line)[3 * w - 3 * x - 3]);
280
                        FFSWAP(uint8_t, ((uint8_t *)line)[3 * x + 1], ((uint8_t *)line)[3 * w - 3 * x - 2]);
281
                        FFSWAP(uint8_t, ((uint8_t *)line)[3 * x + 2], ((uint8_t *)line)[3 * w - 3 * x - 1]);
282
                        break;
283
                    case 16:
284
                        FFSWAP(uint16_t, ((uint16_t *)line)[x], ((uint16_t *)line)[w - x - 1]);
285
                        break;
286
                    case 8:
287
                        FFSWAP(uint8_t, ((uint8_t *)line)[x], ((uint8_t *)line)[w - x - 1]);
288
                    }
289
                }
290
            }
291
        }
292
    }
293
294
295
37
    *got_frame = 1;
296
297
37
    return avpkt->size;
298
}
299
300
AVCodec ff_targa_decoder = {
301
    .name           = "targa",
302
    .long_name      = NULL_IF_CONFIG_SMALL("Truevision Targa image"),
303
    .type           = AVMEDIA_TYPE_VIDEO,
304
    .id             = AV_CODEC_ID_TARGA,
305
    .priv_data_size = sizeof(TargaContext),
306
    .decode         = decode_frame,
307
    .capabilities   = AV_CODEC_CAP_DR1,
308
};