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Merge pull request #1254 from turtleli/isoreader-layer1 

cdvd:iso: Use Primary Volume Descriptor to find DVD layer break
This commit is contained in:
Jonathan Li 2016-03-28 13:05:02 +01:00
parent f6ee94589f 5d303c793b
commit cb29585e84
1 changed files with 34 additions and 104 deletions
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144
pcsx2/CDVD/CDVDisoReader.cpp
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@ -22,14 +22,12 @@
#include "PrecompiledHeader.h"
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include "CDVDisoReader.h"
#include "AsyncFileReader.h"
#include <cstring>
#include <array>
static InputIsoFile iso;
static int pmode, cdtype;
@ -130,122 +128,54 @@ s32 CALLBACK ISOgetTD(u8 Track, cdvdTD *Buffer)
return 0;
}
#include "gui/App.h"
#include "Utilities/HashMap.h"
static bool testForPartitionInfo( const u8 (&tempbuffer)[CD_FRAMESIZE_RAW] )
static bool testForPrimaryVolumeDescriptor(const std::array<u8, CD_FRAMESIZE_RAW>& buffer)
{
const int off = iso.GetBlockOffset();
const std::array<u8, 6> identifier = {1, 'C', 'D', '0', '0', '1'};
// test for: CD001
return (
(tempbuffer[off+1] == 0x43) &&
(tempbuffer[off+2] == 0x44) &&
(tempbuffer[off+3] == 0x30) &&
(tempbuffer[off+4] == 0x30) &&
(tempbuffer[off+5] == 0x31)
);
return std::equal(identifier.begin(), identifier.end(), buffer.begin() + iso.GetBlockOffset());
}
static void FindLayer1Start()
{
if (iso.GetBlockCount() < 0x230540) return;
if (layer1start != -1) return;
if (layer1searched) return;
if (layer1searched)
return;
Console.WriteLn("isoFile: searching for layer1...");
layer1searched = true;
int blockresult = -1;
std::array<u8, CD_FRAMESIZE_RAW> buffer;
// Check the ini file cache first:
// Cache is stored in LayerBreakCache.ini, and is associated by hex-encoded hash key of the
// complete filename/path of the iso file. :)
wxString layerCacheFile( Path::Combine(GetSettingsFolder().ToString(), L"LayerBreakCache.ini") );
wxFileConfig layerCacheIni( wxEmptyString, wxEmptyString, layerCacheFile, wxEmptyString, wxCONFIG_USE_RELATIVE_PATH );
FastFormatUnicode cacheKey;
cacheKey.Write( L"%X", HashTools::Hash( (s8*)iso.GetFilename().wx_str(), iso.GetFilename().Length() * sizeof(wxChar) ) );
blockresult = layerCacheIni.Read( cacheKey, -1 );
if( blockresult != -1 )
// The ISO9660 primary volume descriptor for layer 0 is located at sector 16
iso.ReadSync(buffer.data(), 16);
if (!testForPrimaryVolumeDescriptor(buffer))
{
u8 tempbuffer[CD_FRAMESIZE_RAW];
iso.ReadSync(tempbuffer, blockresult);
Console.Error("isoFile: Invalid layer0 Primary Volume Descriptor");
return;
}
if( testForPartitionInfo( tempbuffer ) )
// The volume space size (sector count) is located at bytes 80-87 - 80-83
// is the little endian size, 84-87 is the big endian size.
const int offset = iso.GetBlockOffset();
uint blockresult = buffer[offset + 80]
+ (buffer[offset + 81] << 8)
+ (buffer[offset + 82] << 16)
+ (buffer[offset + 83] << 24);
// If the ISO sector count is larger than the volume size, then we should
// have a dual layer DVD. Layer 1 is on a different volume.
if (blockresult < iso.GetBlockCount())
{
Console.WriteLn( "isoFile: loaded second layer from settings cache, sector=0x%08x", blockresult );
// The layer 1 start LSN contains the primary volume descriptor for layer 1.
// The check might be a bit unnecessary though.
if (iso.ReadSync(buffer.data(), blockresult) == -1)
return;
if (!testForPrimaryVolumeDescriptor(buffer))
{
Console.Error("isoFile: Invalid layer1 Primary Volume Descriptor");
return;
}
layer1start = blockresult;
}
else
{
Console.Warning( "isoFile: second layer info in the settings cache appears to be obsolete or invalid. Ignoring..." );
}
}
else
{
DevCon.WriteLn( "isoFile: no cached info for second layer found." );
}
if( layer1start == -1 )
{
// Layer sizes are arbitrary, and either layer could be the smaller (GoW and Rogue Galaxy
// both have Layer1 larger than Layer0 for example), so we have to brute-force the search
// from some arbitrary start position.
//
// Method: Inside->out. We start at the middle of the image and work our way out toward
// both the beginning and end of the image at the same time. Most images have the layer
// break quite close to the middle of the image, so this should be pretty fast in most cases.
// [TODO] Layer searching can be slow, especially for compressed disc images, so it would
// be quite courteous to pop up a status dialog bar that lets the user know that it's
// thinking. Since we're not on the GUI thread, we'll need to establish some messages
// to create the window and pass progress increments back to it.
uint midsector = (iso.GetBlockCount() / 2) & ~0xf;
uint deviation = 0;
while( (layer1start == -1) && (deviation < midsector-16) )
{
u8 tempbuffer[CD_FRAMESIZE_RAW];
iso.ReadSync(tempbuffer, midsector-deviation);
if(testForPartitionInfo( tempbuffer ))
layer1start = midsector-deviation;
else
{
iso.ReadSync(tempbuffer, midsector+deviation);
if( testForPartitionInfo( tempbuffer ) )
layer1start = midsector+deviation;
}
if( layer1start != -1 )
{
const int blockofs = iso.GetBlockOffset();
if( !pxAssertDev( tempbuffer[blockofs] == 0x01, "Layer1-Detect: CD001 tag found, but the partition type is invalid." ) )
{
Console.Error( "isoFile: Invalid partition type on layer 1!? (type=0x%x)", tempbuffer[blockofs] );
}
}
deviation += 16;
}
if( layer1start == -1 )
{
Console.Error("isoFile: Couldn't find layer1... iso image is probably corrupt or incomplete.");
}
else
{
Console.WriteLn( Color_Blue, "isoFile: second layer found at sector 0x%08x", layer1start);
// Save layer information to configuration:
layerCacheIni.Write( cacheKey, layer1start );
}
Console.WriteLn(Color_Blue, "isoFile: second layer found at sector 0x%08x", layer1start);
}
}