343 lines
9.3 KiB
C++
343 lines
9.3 KiB
C++
// Copyright (C) 2003-2008 Dolphin Project.
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, version 2.0.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License 2.0 for more details.
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// A copy of the GPL 2.0 should have been included with the program.
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// If not, see http://www.gnu.org/licenses/
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// Official SVN repository and contact information can be found at
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// http://code.google.com/p/dolphin-emu/
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#include "stdafx.h"
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#ifdef _WIN32
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#include <io.h>
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#include <windows.h>
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#else
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#include <unistd.h>
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#endif
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#include "Common.h"
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#include "CompressedBlob.h"
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#include "FileUtil.h"
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#include "Hash.h"
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#ifdef _WIN32
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#include "../../../../Externals/zlib/zlib.h"
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#else
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// TODO: Include generic zlib.h
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#include "../../../../Externals/zlib/zlib.h"
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#endif
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namespace DiscIO
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{
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CompressedBlobReader::CompressedBlobReader(const char *filename)
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{
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file = fopen(filename, "rb");
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fseek(file, 0, SEEK_END);
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file_size = ftell(file);
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fseek(file, 0, SEEK_SET);
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fread(&header, sizeof(CompressedBlobHeader), 1, file);
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SetSectorSize(header.block_size);
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// cache block pointers and hashes
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block_pointers = new u64[header.num_blocks];
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fread(block_pointers, sizeof(u64), header.num_blocks, file);
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hashes = new u32[header.num_blocks];
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fread(hashes, sizeof(u32), header.num_blocks, file);
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data_offset = (sizeof(CompressedBlobHeader))
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+ (sizeof(u64)) * header.num_blocks // skip block pointers
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+ (sizeof(u32)) * header.num_blocks; // skip hashes
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// A compressed block is never ever longer than a decompressed block, so just header.block_size should be fine.
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// I still add some safety margin.
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zlib_buffer_size = header.block_size + 64;
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zlib_buffer = new u8[zlib_buffer_size];
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memset(zlib_buffer, 0, zlib_buffer_size);
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}
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CompressedBlobReader* CompressedBlobReader::Create(const char* filename)
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{
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if (IsCompressedBlob(filename))
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return new CompressedBlobReader(filename);
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else
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return 0;
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}
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CompressedBlobReader::~CompressedBlobReader()
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{
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delete [] zlib_buffer;
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delete [] block_pointers;
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delete [] hashes;
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fclose(file);
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file = 0;
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}
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// IMPORTANT: Calling this function invalidates all earlier pointers gotten from this function.
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u64 CompressedBlobReader::GetBlockCompressedSize(u64 block_num) const
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{
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u64 start = block_pointers[block_num];
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if (block_num < header.num_blocks - 1)
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return block_pointers[block_num + 1] - start;
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else if (block_num == header.num_blocks - 1)
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return header.compressed_data_size - start;
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else
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PanicAlert("GetBlockCompressedSize - illegal block number %i", (int)block_num);
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return 0;
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}
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void CompressedBlobReader::GetBlock(u64 block_num, u8 *out_ptr)
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{
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bool uncompressed = false;
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u32 comp_block_size = (u32)GetBlockCompressedSize(block_num);
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u64 offset = block_pointers[block_num] + data_offset;
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if (offset & (1ULL << 63))
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{
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if (comp_block_size != header.block_size)
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PanicAlert("Uncompressed block with wrong size");
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uncompressed = true;
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offset &= ~(1ULL << 63);
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}
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// clear unused part of zlib buffer. maybe this can be deleted when it works fully.
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memset(zlib_buffer + comp_block_size, 0, zlib_buffer_size - comp_block_size);
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fseek(file, offset, SEEK_SET);
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fread(zlib_buffer, 1, comp_block_size, file);
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u8* source = zlib_buffer;
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u8* dest = out_ptr;
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// First, check hash.
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u32 block_hash = HashAdler32(source, comp_block_size);
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if (block_hash != hashes[block_num])
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PanicAlert("Hash of block %i is %08x instead of %08x. Your ISO is corrupt.",
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block_num, block_hash, hashes[block_num]);
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if (uncompressed)
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{
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memcpy(dest, source, comp_block_size);
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}
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else
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{
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z_stream z;
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memset(&z, 0, sizeof(z));
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z.next_in = source;
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z.avail_in = comp_block_size;
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if (z.avail_in > header.block_size)
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{
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PanicAlert("We have a problem");
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}
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z.next_out = dest;
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z.avail_out = header.block_size;
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inflateInit(&z);
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int status = inflate(&z, Z_FULL_FLUSH);
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u32 uncomp_size = header.block_size - z.avail_out;
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if (status != Z_STREAM_END)
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{
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// this seem to fire wrongly from time to time
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// to be sure, don't use compressed isos :P
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PanicAlert("Failure reading block %i - out of data and not at end.", block_num);
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}
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inflateEnd(&z);
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if (uncomp_size != header.block_size)
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PanicAlert("Wrong block size");
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}
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}
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bool CompressFileToBlob(const char* infile, const char* outfile, u32 sub_type,
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int block_size, CompressCB callback, void* arg)
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{
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if (File::GetSize(infile) > 2000000000ULL) {
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PanicAlert("Sorry - compressing Wii games not yet supported.");
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return false;
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}
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if (IsCompressedBlob(infile))
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{
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PanicAlert("%s is already compressed! Cannot compress it further.", infile);
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return false;
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}
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FILE* inf = fopen(infile, "rb");
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if (!inf)
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return false;
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FILE* f = fopen(outfile, "wb");
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if (!f)
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return false;
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callback("Files opened, ready to compress.", 0, arg);
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fseek(inf, 0, SEEK_END);
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s64 insize = ftell(inf);
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fseek(inf, 0, SEEK_SET);
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CompressedBlobHeader header;
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header.magic_cookie = kBlobCookie;
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header.sub_type = sub_type;
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header.block_size = block_size;
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header.data_size = insize;
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// round upwards!
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header.num_blocks = (u32)((header.data_size + (block_size - 1)) / block_size);
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u64* offsets = new u64[header.num_blocks];
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u32* hashes = new u32[header.num_blocks];
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u8* out_buf = new u8[block_size];
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u8* in_buf = new u8[block_size];
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// seek past the header (we will write it at the end)
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fseek(f, sizeof(CompressedBlobHeader), SEEK_CUR);
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// seek past the offset and hash tables (we will write them at the end)
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fseek(f, (sizeof(u64) + sizeof(u32)) * header.num_blocks, SEEK_CUR);
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// Now we are ready to write compressed data!
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u64 position = 0;
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int num_compressed = 0;
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int num_stored = 0;
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for (u32 i = 0; i < header.num_blocks; i++)
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{
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if (i % (header.num_blocks / 1000) == 0)
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{
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u64 inpos = ftell(inf);
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int ratio = 0;
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if (inpos != 0)
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ratio = (int)(100 * position / inpos);
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char temp[512];
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sprintf(temp, "%i of %i blocks. compression ratio %i%%", i, header.num_blocks, ratio);
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callback(temp, (float)i / (float)header.num_blocks, arg);
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}
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offsets[i] = position;
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// u64 start = i * header.block_size;
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// u64 size = header.block_size;
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memset(in_buf, 0, header.block_size);
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fread(in_buf, header.block_size, 1, inf);
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z_stream z;
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memset(&z, 0, sizeof(z));
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z.zalloc = Z_NULL;
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z.zfree = Z_NULL;
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z.opaque = Z_NULL;
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z.next_in = in_buf;
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z.avail_in = header.block_size;
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z.next_out = out_buf;
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z.avail_out = block_size;
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int retval = deflateInit(&z, 9);
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if (retval != Z_OK)
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{
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PanicAlert("Deflate failed");
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goto cleanup;
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}
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int status = deflate(&z, Z_FINISH);
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int comp_size = block_size - z.avail_out;
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if ((status != Z_STREAM_END) || (z.avail_out < 10))
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{
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//PanicAlert("%i %i Store %i", i*block_size, position, comp_size);
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// let's store uncompressed
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offsets[i] |= 0x8000000000000000ULL;
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fwrite(in_buf, block_size, 1, f);
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hashes[i] = HashAdler32(in_buf, block_size);
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position += block_size;
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num_stored++;
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}
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else
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{
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// let's store compressed
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//PanicAlert("Comp %i to %i", block_size, comp_size);
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fwrite(out_buf, comp_size, 1, f);
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hashes[i] = HashAdler32(out_buf, comp_size);
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position += comp_size;
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num_compressed++;
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}
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deflateEnd(&z);
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}
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header.compressed_data_size = position;
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// Okay, go back and fill in headers
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fseek(f, 0, SEEK_SET);
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fwrite(&header, sizeof(header), 1, f);
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fwrite(offsets, sizeof(u64), header.num_blocks, f);
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fwrite(hashes, sizeof(u32), header.num_blocks, f);
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cleanup:
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// Cleanup
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delete[] in_buf;
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delete[] out_buf;
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delete[] offsets;
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fclose(f);
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fclose(inf);
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callback("Done compressing disc image.", 1.0f, arg);
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return true;
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}
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bool DecompressBlobToFile(const char* infile, const char* outfile, CompressCB callback, void* arg)
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{
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if (!IsCompressedBlob(infile))
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{
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PanicAlert("File not compressed");
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return false;
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}
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CompressedBlobReader* reader = CompressedBlobReader::Create(infile);
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if (!reader) return false;
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FILE* f = fopen(outfile, "wb");
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const CompressedBlobHeader &header = reader->GetHeader();
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u8* buffer = new u8[header.block_size];
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for (u64 i = 0; i < header.num_blocks; i++)
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{
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if (i % (header.num_blocks / 100) == 0)
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{
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callback("Unpacking", (float)i / (float)header.num_blocks, arg);
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}
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reader->Read(i * header.block_size, header.block_size, buffer);
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fwrite(buffer, header.block_size, 1, f);
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}
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delete[] buffer;
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#ifdef _WIN32
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// ector: _chsize sucks, not 64-bit safe
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// F|RES: changed to _chsize_s. i think it is 64-bit safe
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_chsize_s(_fileno(f), (long)header.data_size);
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#else
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ftruncate(fileno(f), header.data_size);
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#endif
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fclose(f);
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delete reader;
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return true;
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}
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bool IsCompressedBlob(const char* filename)
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{
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FILE* f = fopen(filename, "rb");
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if (!f)
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return false;
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CompressedBlobHeader header;
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fread(&header, sizeof(header), 1, f);
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fclose(f);
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return header.magic_cookie == kBlobCookie;
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}
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} // namespace
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