void CompressedBlobReader::GetBlock(u64 block_num, u8 *out_ptr)
{
bool uncompressed = false;
u32 comp_block_size = (u32)GetBlockCompressedSize(block_num);
u64 offset = m_block_pointers[block_num] + m_data_offset;
if (offset & (1ULL << 63))
{
if (comp_block_size != m_header.block_size)
PanicAlert("Uncompressed block with wrong size");
uncompressed = true;
offset &= ~(1ULL << 63);
}
// clear unused part of zlib buffer. maybe this can be deleted when it works fully.
memset(&m_zlib_buffer[comp_block_size], 0, m_zlib_buffer.size() - comp_block_size);
m_file.Seek(offset, SEEK_SET);
m_file.ReadBytes(m_zlib_buffer.data(), comp_block_size);
// First, check hash.
u32 block_hash = HashAdler32(m_zlib_buffer.data(), comp_block_size);
if (block_hash != m_hashes[block_num])
PanicAlertT("The disc image \"%s\" is corrupt.\n"
"Hash of block %" PRIu64 " is %08x instead of %08x.",
m_file_name.c_str(),
block_num, block_hash, m_hashes[block_num]);
if (uncompressed)
{
std::copy(m_zlib_buffer.begin(), m_zlib_buffer.begin() + comp_block_size, out_ptr);
}
else
{
z_stream z = {};
z.next_in = m_zlib_buffer.data();
z.avail_in = comp_block_size;
if (z.avail_in > m_header.block_size)
{
PanicAlert("We have a problem");
}
z.next_out = out_ptr;
z.avail_out = m_header.block_size;
inflateInit(&z);
int status = inflate(&z, Z_FULL_FLUSH);
u32 uncomp_size = m_header.block_size - z.avail_out;
if (status != Z_STREAM_END)
{
// this seem to fire wrongly from time to time
// to be sure, don't use compressed isos :P
PanicAlert("Failure reading block %" PRIu64 " - out of data and not at end.", block_num);
}
inflateEnd(&z);
if (uncomp_size != m_header.block_size)
PanicAlert("Wrong block size");
}
}
void CompressedBlobReader::GetBlock(u64 block_num, u8 *out_ptr)
{
bool uncompressed = false;
u32 comp_block_size = (u32)GetBlockCompressedSize(block_num);
u64 offset = block_pointers[block_num] + data_offset;
if (offset & (1ULL << 63))
{
if (comp_block_size != header.block_size)
PanicAlert("Uncompressed block with wrong size");
uncompressed = true;
offset &= ~(1ULL << 63);
}
// clear unused part of zlib buffer. maybe this can be deleted when it works fully.
memset(zlib_buffer + comp_block_size, 0, zlib_buffer_size - comp_block_size);
m_file.Seek(offset, SEEK_SET);
m_file.ReadBytes(zlib_buffer, comp_block_size);
u8* source = zlib_buffer;
u8* dest = out_ptr;
// First, check hash.
u32 block_hash = HashAdler32(source, comp_block_size);
if (block_hash != hashes[block_num])
PanicAlert("Hash of block %lli is %08x instead of %08x.\n"
"Your ISO, %s, is corrupt.",
block_num, block_hash, hashes[block_num],
file_name.c_str());
if (uncompressed)
{
memcpy(dest, source, comp_block_size);
}
else
{
z_stream z;
memset(&z, 0, sizeof(z));
z.next_in = source;
z.avail_in = comp_block_size;
if (z.avail_in > header.block_size)
{
PanicAlert("We have a problem");
}
z.next_out = dest;
z.avail_out = header.block_size;
inflateInit(&z);
int status = inflate(&z, Z_FULL_FLUSH);
u32 uncomp_size = header.block_size - z.avail_out;
if (status != Z_STREAM_END)
{
// this seem to fire wrongly from time to time
// to be sure, don't use compressed isos :P
PanicAlert("Failure reading block %lli - out of data and not at end.", block_num);
}
inflateEnd(&z);
if (uncomp_size != header.block_size)
PanicAlert("Wrong block size");
}
}
