libretro/scummvm
1
0
Fork 0
mirror of https://github.com/libretro/scummvm.git synced 2025-01-19 08:25:35 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

IMAGE: Make JYV1 decoder a little more robust to bad data

Browse Source
This commit is contained in:
Matthew Duggan 2021-07-25 14:22:29 +09:00
parent 99642ec18e
commit 732d05f036
1 changed files with 6 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
image/codecs/jyv1.cpp
View File

@ -75,8 +75,6 @@ const Graphics::Surface *JYV1Decoder::decodeFrame(Common::SeekableReadStream &st
offsets[i] = stream.readUint32LE() + startOffset;
}
int y = 0;
int x = 0;
bool upscale = false;
//
@ -106,7 +104,10 @@ const Graphics::Surface *JYV1Decoder::decodeFrame(Common::SeekableReadStream &st
upscale = true;
}
for (int i = 0; i < numOffsets; i++) {
int y = 0;
int x = 0;
for (int i = 0; i < numOffsets && y < _height; i++) {
stream.seek(offsets[i], SEEK_SET);
const int cmdLen = stream.readUint32LE();
@ -116,7 +117,7 @@ const Graphics::Surface *JYV1Decoder::decodeFrame(Common::SeekableReadStream &st
Common::BitStreamMemoryStream cmdMemStream(cmdData, cmdLen);
Common::BitStreamMemory8MSB cmdBitStream(cmdMemStream);
bool skipping = true;
while (!cmdBitStream.eos()) {
while (cmdBitStream.size() - cmdBitStream.pos() >= 4 && y < _height) {
uint32 idx = cmdBitStream.getBits(4);
uint32 blocksize = BASE_LEN[idx];
if (idx != 0 && idx != 8) {
@ -137,7 +138,7 @@ const Graphics::Surface *JYV1Decoder::decodeFrame(Common::SeekableReadStream &st
}
} else {
// draw blocksize pixels from data block
while (blocksize) {
while (blocksize && y < _height) {
// TODO: would be nicer to read these in whole scanlines.
// Also this upscale code is kinda ugly.
const uint8 p = stream.readByte();