dolphin/Source/Core/DiscIO/CompressedBlob.cpp

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// Copyright 2013 Dolphin Emulator Project
// Licensed under GPLv2
// Refer to the license.txt file included.
#ifdef _WIN32
#include <io.h>
#include <windows.h>
#endif
#include <algorithm>
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#include <cinttypes>
#include <cstdio>
#include <cstring>
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#include <memory>
#include <string>
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#include <vector>
#include <zlib.h>
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#include "Common/CommonTypes.h"
#include "Common/FileUtil.h"
#include "Common/Hash.h"
#include "Common/StringUtil.h"
#include "DiscIO/Blob.h"
#include "DiscIO/CompressedBlob.h"
#include "DiscIO/DiscScrubber.h"
namespace DiscIO
{
CompressedBlobReader::CompressedBlobReader(const std::string& filename) : m_file_name(filename)
{
m_file.Open(filename, "rb");
m_file_size = File::GetSize(filename);
m_file.ReadArray(&m_header, 1);
SetSectorSize(m_header.block_size);
// cache block pointers and hashes
m_block_pointers = new u64[m_header.num_blocks];
m_file.ReadArray(m_block_pointers, m_header.num_blocks);
m_hashes = new u32[m_header.num_blocks];
m_file.ReadArray(m_hashes, m_header.num_blocks);
m_data_offset = (sizeof(CompressedBlobHeader))
+ (sizeof(u64)) * m_header.num_blocks // skip block pointers
+ (sizeof(u32)) * m_header.num_blocks; // skip hashes
// A compressed block is never ever longer than a decompressed block, so just header.block_size should be fine.
// I still add some safety margin.
m_zlib_buffer_size = m_header.block_size + 64;
m_zlib_buffer = new u8[m_zlib_buffer_size];
memset(m_zlib_buffer, 0, m_zlib_buffer_size);
}
CompressedBlobReader* CompressedBlobReader::Create(const std::string& filename)
{
if (IsCompressedBlob(filename))
return new CompressedBlobReader(filename);
else
return nullptr;
}
CompressedBlobReader::~CompressedBlobReader()
{
delete [] m_zlib_buffer;
delete [] m_block_pointers;
delete [] m_hashes;
}
// IMPORTANT: Calling this function invalidates all earlier pointers gotten from this function.
u64 CompressedBlobReader::GetBlockCompressedSize(u64 block_num) const
{
u64 start = m_block_pointers[block_num];
if (block_num < m_header.num_blocks - 1)
return m_block_pointers[block_num + 1] - start;
else if (block_num == m_header.num_blocks - 1)
return m_header.compressed_data_size - start;
else
PanicAlert("GetBlockCompressedSize - illegal block number %i", (int)block_num);
return 0;
}
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, comp_block_size);
u8* source = m_zlib_buffer;
u8* dest = out_ptr;
// First, check hash.
u32 block_hash = HashAdler32(source, comp_block_size);
if (block_hash != m_hashes[block_num])
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PanicAlert("Hash of block %" PRIu64 " is %08x instead of %08x.\n"
"Your ISO, %s, is corrupt.",
block_num, block_hash, m_hashes[block_num],
m_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 > m_header.block_size)
{
PanicAlert("We have a problem");
}
z.next_out = dest;
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
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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");
}
}
bool CompressFileToBlob(const std::string& infile, const std::string& outfile, u32 sub_type,
int block_size, CompressCB callback, void* arg)
{
bool scrubbing = false;
if (IsCompressedBlob(infile))
{
PanicAlertT("%s is already compressed! Cannot compress it further.", infile.c_str());
return false;
}
if (sub_type == 1)
{
if (!DiscScrubber::SetupScrub(infile, block_size))
{
PanicAlertT("%s failed to be scrubbed. Probably the image is corrupt.", infile.c_str());
return false;
}
scrubbing = true;
}
z_stream z = {};
if (deflateInit(&z, 9) != Z_OK)
return false;
File::IOFile inf(infile, "rb");
File::IOFile f(outfile, "wb");
if (!f || !inf)
{
deflateEnd(&z);
return false;
}
callback("Files opened, ready to compress.", 0, arg);
CompressedBlobHeader header;
header.magic_cookie = kBlobCookie;
header.sub_type = sub_type;
header.block_size = block_size;
header.data_size = File::GetSize(infile);
// round upwards!
header.num_blocks = (u32)((header.data_size + (block_size - 1)) / block_size);
u64* offsets = new u64[header.num_blocks];
u32* hashes = new u32[header.num_blocks];
u8* out_buf = new u8[block_size];
u8* in_buf = new u8[block_size];
// seek past the header (we will write it at the end)
f.Seek(sizeof(CompressedBlobHeader), SEEK_CUR);
// seek past the offset and hash tables (we will write them at the end)
f.Seek((sizeof(u64) + sizeof(u32)) * header.num_blocks, SEEK_CUR);
// Now we are ready to write compressed data!
u64 position = 0;
int num_compressed = 0;
int num_stored = 0;
int progress_monitor = std::max<int>(1, header.num_blocks / 1000);
bool was_cancelled = false;
for (u32 i = 0; i < header.num_blocks; i++)
{
if (i % progress_monitor == 0)
{
const u64 inpos = inf.Tell();
int ratio = 0;
if (inpos != 0)
ratio = (int)(100 * position / inpos);
std::string temp = StringFromFormat("%i of %i blocks. Compression ratio %i%%", i, header.num_blocks, ratio);
was_cancelled = !callback(temp, (float)i / (float)header.num_blocks, arg);
if (was_cancelled)
break;
}
offsets[i] = position;
size_t read_bytes;
if (scrubbing)
read_bytes = DiscScrubber::GetNextBlock(inf, in_buf);
else
inf.ReadArray(in_buf, header.block_size, &read_bytes);
if (read_bytes < header.block_size)
std::fill(in_buf + read_bytes, in_buf + header.block_size, 0);
int retval = deflateReset(&z);
z.next_in = in_buf;
z.avail_in = header.block_size;
z.next_out = out_buf;
z.avail_out = block_size;
if (retval != Z_OK)
{
ERROR_LOG(DISCIO, "Deflate failed");
goto cleanup;
}
int status = deflate(&z, Z_FINISH);
int comp_size = block_size - z.avail_out;
if ((status != Z_STREAM_END) || (z.avail_out < 10))
{
//PanicAlert("%i %i Store %i", i*block_size, position, comp_size);
// let's store uncompressed
offsets[i] |= 0x8000000000000000ULL;
f.WriteBytes(in_buf, block_size);
hashes[i] = HashAdler32(in_buf, block_size);
position += block_size;
num_stored++;
}
else
{
// let's store compressed
//PanicAlert("Comp %i to %i", block_size, comp_size);
f.WriteBytes(out_buf, comp_size);
hashes[i] = HashAdler32(out_buf, comp_size);
position += comp_size;
num_compressed++;
}
}
header.compressed_data_size = position;
if (was_cancelled)
{
// Remove the incomplete output file.
f.Close();
File::Delete(outfile);
}
else
{
// Okay, go back and fill in headers
f.Seek(0, SEEK_SET);
f.WriteArray(&header, 1);
f.WriteArray(offsets, header.num_blocks);
f.WriteArray(hashes, header.num_blocks);
}
cleanup:
// Cleanup
delete[] in_buf;
delete[] out_buf;
delete[] offsets;
delete[] hashes;
deflateEnd(&z);
DiscScrubber::Cleanup();
callback("Done compressing disc image.", 1.0f, arg);
return true;
}
bool DecompressBlobToFile(const std::string& infile, const std::string& outfile, CompressCB callback, void* arg)
{
if (!IsCompressedBlob(infile))
{
PanicAlertT("File not compressed");
return false;
}
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std::unique_ptr<CompressedBlobReader> reader(CompressedBlobReader::Create(infile));
if (!reader)
return false;
File::IOFile f(outfile, "wb");
if (!f)
return false;
const CompressedBlobHeader &header = reader->GetHeader();
static const size_t BUFFER_BLOCKS = 32;
size_t buffer_size = header.block_size * BUFFER_BLOCKS;
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std::vector<u8> buffer(buffer_size);
u32 num_buffers = header.num_blocks / BUFFER_BLOCKS;
int progress_monitor = std::max<int>(1, num_buffers / 100);
bool was_cancelled = false;
for (u64 i = 0; i < num_buffers; i++)
{
if (i % progress_monitor == 0)
{
was_cancelled = !callback("Unpacking", (float)i / (float)num_buffers, arg);
if (was_cancelled)
break;
}
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reader->Read(i * buffer_size, buffer_size, buffer.data());
f.WriteBytes(buffer.data(), buffer_size);
}
if (was_cancelled)
{
// Remove the incomplete output file.
f.Close();
File::Delete(outfile);
}
else
{
f.Resize(header.data_size);
}
return true;
}
bool IsCompressedBlob(const std::string& filename)
{
File::IOFile f(filename, "rb");
CompressedBlobHeader header;
return f.ReadArray(&header, 1) && (header.magic_cookie == kBlobCookie);
}
} // namespace