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BrotliDecompressionSource: don't bail out too early

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If we've consumed the entire input, that doesn't actually mean we're
done decompressing - there might be more output left. This worked (?)
in most cases because the input and output sizes are pretty comparable,
but sometimes they're not and then things get very funny.

Change-Id: I73435a654a911b8ce25119f713b80706c5783c1b
This commit is contained in:
Ilya K 2024-06-20 08:54:43 +03:00
parent fb7d315411
commit 7d52d74bbe
2 changed files with 24 additions and 13 deletions
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27
src/libutil/compression.cc
View file

@ -163,23 +163,24 @@ struct BrotliDecompressionSource : Source
uint8_t * out = (uint8_t *) data;
const auto * begin = out;
try {
while (len && !BrotliDecoderIsFinished(state.get())) {
checkInterrupt();
while (len && !BrotliDecoderIsFinished(state.get())) {
checkInterrupt();
while (avail_in == 0) {
while (avail_in == 0) {
try {
avail_in = inner->read(buf.get(), BUF_SIZE);
next_in = (const uint8_t *) buf.get();
}
if (!BrotliDecoderDecompressStream(
state.get(), &avail_in, &next_in, &len, &out, nullptr
))
{
throw CompressionError("error while decompressing brotli file");
} catch (EndOfFile &) {
break;
}
next_in = (const uint8_t *) buf.get();
}
if (!BrotliDecoderDecompressStream(
state.get(), &avail_in, &next_in, &len, &out, nullptr
))
{
throw CompressionError("error while decompressing brotli file");
}
} catch (EndOfFile &) {
}
if (begin != out) {

10
tests/unit/libutil/compression.cc
View file

@ -66,6 +66,16 @@ namespace nix {
ASSERT_THROW(decompress(method, str), CompressionError);
}
TEST(decompress, veryLongBrotli) {
auto method = "br";
auto str = std::string(65536, 'a');
auto o = decompress(method, compress(method, str));
// This is just to not print 64k of "a" for most failures
ASSERT_EQ(o.length(), str.length());
ASSERT_EQ(o, str);
}
/* ----------------------------------------------------------------------------
* compression sinks
* --------------------------------------------------------------------------*/