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Handle packets that cross scan lines

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This commit is contained in:
Andrew Murray 2022-02-23 15:08:33 +11:00
parent 17d342bc4b
commit 0d729941a8
4 changed files with 43 additions and 15 deletions
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Tests/images/cross_scan_line.png Normal file
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Tests/images/cross_scan_line.tga Normal file
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5
Tests/test_file_tga.py
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@ -97,6 +97,11 @@ def test_id_field_rle():
assert im.size == (199, 199) assert im.size == (199, 199)
def test_cross_scan_line():
with Image.open("Tests/images/cross_scan_line.tga") as im:
assert_image_equal_tofile(im, "Tests/images/cross_scan_line.png")
def test_save(tmp_path): def test_save(tmp_path):
test_file = "Tests/images/tga_id_field.tga" test_file = "Tests/images/tga_id_field.tga"
with Image.open(test_file) as im: with Image.open(test_file) as im:

53
src/libImaging/TgaRleDecode.c
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@ -20,6 +20,8 @@ int
ImagingTgaRleDecode(Imaging im, ImagingCodecState state, UINT8 *buf, Py_ssize_t bytes) { ImagingTgaRleDecode(Imaging im, ImagingCodecState state, UINT8 *buf, Py_ssize_t bytes) {
int n, depth; int n, depth;
UINT8 *ptr; UINT8 *ptr;
UINT8 extra_data = 0;
int extra_bytes = 0;
ptr = buf; ptr = buf;
@ -72,8 +74,10 @@ ImagingTgaRleDecode(Imaging im, ImagingCodecState state, UINT8 *buf, Py_ssize_t
} }
if (state->x + n > state->bytes) { if (state->x + n > state->bytes) {
state->errcode = IMAGING_CODEC_OVERRUN; extra_bytes = n; /* full value */
return -1; n = state->bytes - state->x;
extra_bytes -= n;
extra_data = ptr[1];
} }
memcpy(state->buffer + state->x, ptr + 1, n); memcpy(state->buffer + state->x, ptr + 1, n);
@ -82,24 +86,43 @@ ImagingTgaRleDecode(Imaging im, ImagingCodecState state, UINT8 *buf, Py_ssize_t
bytes -= 1 + n; bytes -= 1 + n;
} }
state->x += n; for (;;) {
state->x += n;
if (state->x >= state->bytes) { if (state->x >= state->bytes) {
/* Got a full line, unpack it */ /* Got a full line, unpack it */
state->shuffle( state->shuffle(
(UINT8 *)im->image[state->y + state->yoff] + (UINT8 *)im->image[state->y + state->yoff] +
state->xoff * im->pixelsize, state->xoff * im->pixelsize,
state->buffer, state->buffer,
state->xsize); state->xsize);
state->x = 0; state->x = 0;
state->y += state->ystep; state->y += state->ystep;
if (state->y < 0 || state->y >= state->ysize) { if (state->y < 0 || state->y >= state->ysize) {
/* End of file (errcode = 0) */ /* End of file (errcode = 0) */
return -1; return -1;
}
} }
if (extra_bytes == 0) {
break;
}
if (state->x > 0) {
break; // assert
}
if (extra_bytes >= state->bytes) {
n = state->bytes;
} else {
n = extra_bytes;
}
memcpy(state->buffer + state->x, ptr, n);
ptr += n;
extra_bytes -= n;
} }
} }