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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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typedef struct TargaContext {
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int compression_type;
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#define CHECK_BUFFER_SIZE(buf, buf_end, needed, where) \
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if(needed > buf_end - buf){ \
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av_log(avctx, AV_LOG_ERROR, "Problem: unexpected end of data while reading " where "\n"); \
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static int targa_decode_rle(AVCodecContext *avctx, TargaContext *s, const uint8_t *src, int src_size, uint8_t *dst, int w, int h, int stride, int bpp)
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static int targa_decode_rle(AVCodecContext *avctx, TargaContext *s,
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uint8_t *dst, int w, int h, int stride, int bpp)
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int depth = (bpp + 1) >> 3;
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const uint8_t *src_end = src + src_size;
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diff = stride - w * depth;
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CHECK_BUFFER_SIZE(src, src_end, 1, "image type");
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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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type = bytestream2_get_byteu(&s->gb);
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count = (type & 0x7F) + 1;
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if((x + count > w) && (x + count + 1 > (h - y) * w)){
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av_log(avctx, AV_LOG_ERROR, "Packet went out of bounds: position (%i,%i) size %i\n", x, y, count);
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CHECK_BUFFER_SIZE(src, src_end, depth, "image data");
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CHECK_BUFFER_SIZE(src, src_end, count * depth, "image data");
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for(i = 0; i < count; i++){
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*((uint16_t*)dst) = AV_RL16(src);
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*((uint32_t*)dst) = AV_RL32(src);
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if (x + count > w && x + count + 1 > (h - y) * w) {
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av_log(avctx, AV_LOG_ERROR,
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"Packet went out of bounds: position (%i,%i) size %i\n",
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return AVERROR_INVALIDDATA;
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int n = FFMIN(count, w - x);
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bytestream2_get_buffer(&s->gb, dst, n * depth);
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bytestream2_get_buffer(&s->gb, tmp, depth);
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int n = FFMIN(count, w - x);
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memcpy(dst, tmp, depth);
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static int decode_frame(AVCodecContext *avctx,
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void *data, int *data_size,
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void *data, int *got_frame,
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const uint8_t *buf = avpkt->data;
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const uint8_t *buf_end = avpkt->data + avpkt->size;
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TargaContext * const s = avctx->priv_data;
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AVFrame *picture = data;
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AVFrame * const p= (AVFrame*)&s->picture;
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AVFrame * const p = &s->picture;
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int idlen, compr, y, w, h, bpp, flags;
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int first_clr, colors, csize;
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bytestream2_init(&s->gb, avpkt->data, avpkt->size);
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/* parse image header */
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CHECK_BUFFER_SIZE(buf, buf_end, 18, "header");
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first_clr = AV_RL16(buf); buf += 2;
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colors = AV_RL16(buf); buf += 2;
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y = AV_RL16(buf); buf += 2;
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w = AV_RL16(buf); buf += 2;
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h = AV_RL16(buf); buf += 2;
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//skip identifier if any
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CHECK_BUFFER_SIZE(buf, buf_end, idlen, "identifiers");
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idlen = bytestream2_get_byte(&s->gb);
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bytestream2_skip(&s->gb, 1); /* pal */
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compr = bytestream2_get_byte(&s->gb);
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first_clr = bytestream2_get_le16(&s->gb);
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colors = bytestream2_get_le16(&s->gb);
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csize = bytestream2_get_byte(&s->gb);
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bytestream2_skip(&s->gb, 4); /* 2: x, 2: y */
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w = bytestream2_get_le16(&s->gb);
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h = bytestream2_get_le16(&s->gb);
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bpp = bytestream2_get_byte(&s->gb);
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flags = bytestream2_get_byte(&s->gb);
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// skip identifier if any
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bytestream2_skip(&s->gb, idlen);
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avctx->pix_fmt = ((compr & (~TGA_RLE)) == TGA_BW) ? PIX_FMT_GRAY8 : PIX_FMT_PAL8;
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avctx->pix_fmt = ((compr & (~TGA_RLE)) == TGA_BW) ? AV_PIX_FMT_GRAY8 : AV_PIX_FMT_PAL8;
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avctx->pix_fmt = PIX_FMT_RGB555;
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avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
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avctx->pix_fmt = PIX_FMT_RGB555;
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avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
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avctx->pix_fmt = PIX_FMT_BGR24;
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avctx->pix_fmt = AV_PIX_FMT_BGR24;
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avctx->pix_fmt = PIX_FMT_RGB32;
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avctx->pix_fmt = AV_PIX_FMT_BGRA;
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av_log(avctx, AV_LOG_ERROR, "Bit depth %i is not supported\n", s->bpp);
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av_log(avctx, AV_LOG_ERROR, "Bit depth %i is not supported\n", bpp);
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pal_size = colors * pal_sample_size;
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CHECK_BUFFER_SIZE(buf, buf_end, pal_size, "color table");
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if(avctx->pix_fmt != PIX_FMT_PAL8)//should not occur but skip palette anyway
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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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uint32_t *pal = ((uint32_t *)p->data[1]) + first_clr;
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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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switch (pal_sample_size) {
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for (t = 0; t < colors; t++)
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*pal++ = bytestream_get_le24(&buf);
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*pal++ = bytestream2_get_le24u(&s->gb);
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for (t = 0; t < colors; t++) {
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uint32_t v = bytestream_get_le16(&buf);
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uint32_t v = bytestream2_get_le16u(&s->gb);
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v = ((v & 0x7C00) << 9) |
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((v & 0x03E0) << 6) |
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((v & 0x001F) << 3);
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p->palette_has_changed = 1;
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if((compr & (~TGA_RLE)) == TGA_NODATA)
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memset(p->data[0], 0, p->linesize[0] * s->height);
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if ((compr & (~TGA_RLE)) == TGA_NODATA) {
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memset(p->data[0], 0, p->linesize[0] * h);
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if(compr & TGA_RLE){
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int res = targa_decode_rle(avctx, s, buf, buf_end - buf, dst, avctx->width, avctx->height, stride, bpp);
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int res = targa_decode_rle(avctx, s, dst, w, h, stride, bpp);
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size_t img_size = s->width * ((s->bpp + 1) >> 3);
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CHECK_BUFFER_SIZE(buf, buf_end, img_size, "image data");
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for(y = 0; y < s->height; y++){
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if((s->bpp + 1) >> 3 == 2){
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uint16_t *dst16 = (uint16_t*)dst;
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for(x = 0; x < s->width; x++)
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dst16[x] = AV_RL16(buf + x * 2);
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}else if((s->bpp + 1) >> 3 == 4){
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uint32_t *dst32 = (uint32_t*)dst;
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for(x = 0; x < s->width; x++)
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dst32[x] = AV_RL32(buf + x * 4);
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memcpy(dst, buf, img_size);
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size_t img_size = w * ((bpp + 1) >> 3);
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if (bytestream2_get_bytes_left(&s->gb) < img_size * h) {
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av_log(avctx, AV_LOG_ERROR,
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"Not enough data available for image\n");
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return AVERROR_INVALIDDATA;
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for (y = 0; y < h; y++) {
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bytestream2_get_bufferu(&s->gb, dst, img_size);
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*picture= *(AVFrame*)&s->picture;
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*data_size = sizeof(AVPicture);
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*picture = s->picture;
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return avpkt->size;