#include "stdafx.h"
#include "ExtractBase.h"
#include "Ogg.h"

COgg::COgg()
{
	const DWORD pCRCTable[256] = {
		0x00000000,0x04c11db7,0x09823b6e,0x0d4326d9,0x130476dc,0x17c56b6b,0x1a864db2,0x1e475005,
		0x2608edb8,0x22c9f00f,0x2f8ad6d6,0x2b4bcb61,0x350c9b64,0x31cd86d3,0x3c8ea00a,0x384fbdbd,
		0x4c11db70,0x48d0c6c7,0x4593e01e,0x4152fda9,0x5f15adac,0x5bd4b01b,0x569796c2,0x52568b75,
		0x6a1936c8,0x6ed82b7f,0x639b0da6,0x675a1011,0x791d4014,0x7ddc5da3,0x709f7b7a,0x745e66cd,
		0x9823b6e0,0x9ce2ab57,0x91a18d8e,0x95609039,0x8b27c03c,0x8fe6dd8b,0x82a5fb52,0x8664e6e5,
		0xbe2b5b58,0xbaea46ef,0xb7a96036,0xb3687d81,0xad2f2d84,0xa9ee3033,0xa4ad16ea,0xa06c0b5d,
		0xd4326d90,0xd0f37027,0xddb056fe,0xd9714b49,0xc7361b4c,0xc3f706fb,0xceb42022,0xca753d95,
		0xf23a8028,0xf6fb9d9f,0xfbb8bb46,0xff79a6f1,0xe13ef6f4,0xe5ffeb43,0xe8bccd9a,0xec7dd02d,
		0x34867077,0x30476dc0,0x3d044b19,0x39c556ae,0x278206ab,0x23431b1c,0x2e003dc5,0x2ac12072,
		0x128e9dcf,0x164f8078,0x1b0ca6a1,0x1fcdbb16,0x018aeb13,0x054bf6a4,0x0808d07d,0x0cc9cdca,
		0x7897ab07,0x7c56b6b0,0x71159069,0x75d48dde,0x6b93dddb,0x6f52c06c,0x6211e6b5,0x66d0fb02,
		0x5e9f46bf,0x5a5e5b08,0x571d7dd1,0x53dc6066,0x4d9b3063,0x495a2dd4,0x44190b0d,0x40d816ba,
		0xaca5c697,0xa864db20,0xa527fdf9,0xa1e6e04e,0xbfa1b04b,0xbb60adfc,0xb6238b25,0xb2e29692,
		0x8aad2b2f,0x8e6c3698,0x832f1041,0x87ee0df6,0x99a95df3,0x9d684044,0x902b669d,0x94ea7b2a,
		0xe0b41de7,0xe4750050,0xe9362689,0xedf73b3e,0xf3b06b3b,0xf771768c,0xfa325055,0xfef34de2,
		0xc6bcf05f,0xc27dede8,0xcf3ecb31,0xcbffd686,0xd5b88683,0xd1799b34,0xdc3abded,0xd8fba05a,
		0x690ce0ee,0x6dcdfd59,0x608edb80,0x644fc637,0x7a089632,0x7ec98b85,0x738aad5c,0x774bb0eb,
		0x4f040d56,0x4bc510e1,0x46863638,0x42472b8f,0x5c007b8a,0x58c1663d,0x558240e4,0x51435d53,
		0x251d3b9e,0x21dc2629,0x2c9f00f0,0x285e1d47,0x36194d42,0x32d850f5,0x3f9b762c,0x3b5a6b9b,
		0x0315d626,0x07d4cb91,0x0a97ed48,0x0e56f0ff,0x1011a0fa,0x14d0bd4d,0x19939b94,0x1d528623,
		0xf12f560e,0xf5ee4bb9,0xf8ad6d60,0xfc6c70d7,0xe22b20d2,0xe6ea3d65,0xeba91bbc,0xef68060b,
		0xd727bbb6,0xd3e6a601,0xdea580d8,0xda649d6f,0xc423cd6a,0xc0e2d0dd,0xcda1f604,0xc960ebb3,
		0xbd3e8d7e,0xb9ff90c9,0xb4bcb610,0xb07daba7,0xae3afba2,0xaafbe615,0xa7b8c0cc,0xa379dd7b,
		0x9b3660c6,0x9ff77d71,0x92b45ba8,0x9675461f,0x8832161a,0x8cf30bad,0x81b02d74,0x857130c3,
		0x5d8a9099,0x594b8d2e,0x5408abf7,0x50c9b640,0x4e8ee645,0x4a4ffbf2,0x470cdd2b,0x43cdc09c,
		0x7b827d21,0x7f436096,0x7200464f,0x76c15bf8,0x68860bfd,0x6c47164a,0x61043093,0x65c52d24,
		0x119b4be9,0x155a565e,0x18197087,0x1cd86d30,0x029f3d35,0x065e2082,0x0b1d065b,0x0fdc1bec,
		0x3793a651,0x3352bbe6,0x3e119d3f,0x3ad08088,0x2497d08d,0x2056cd3a,0x2d15ebe3,0x29d4f654,
		0xc5a92679,0xc1683bce,0xcc2b1d17,0xc8ea00a0,0xd6ad50a5,0xd26c4d12,0xdf2f6bcb,0xdbee767c,
		0xe3a1cbc1,0xe760d676,0xea23f0af,0xeee2ed18,0xf0a5bd1d,0xf464a0aa,0xf9278673,0xfde69bc4,
		0x89b8fd09,0x8d79e0be,0x803ac667,0x84fbdbd0,0x9abc8bd5,0x9e7d9662,0x933eb0bb,0x97ffad0c,
		0xafb010b1,0xab710d06,0xa6322bdf,0xa2f33668,0xbcb4666d,0xb8757bda,0xb5365d03,0xb1f740b4
	};
	memcpy(m_pCRCTable, pCRCTable, 1024);
}

BOOL COgg::Mount(CArcFile* pclArc)
{
	if (lstrcmpi(pclArc->GetArcExten(), _T(".ogg")) != 0)
		return FALSE;
	return pclArc->Mount();
}

BOOL COgg::Decode(CArcFile* pclArc)
{
	SFileInfo* pInfFile = pclArc->GetOpenFileInfo();

	if (pInfFile->format != _T("OGG"))
		return FALSE;

	// すべてメモリに読み込む(上書き対策)
	YCMemory<BYTE> buf(pInfFile->sizeOrg);
	LPBYTE pbuf = &buf[0];
	pclArc->Read(pbuf, pInfFile->sizeOrg);

	// 出力ファイル生成
	pclArc->OpenFile();

	if (pclArc->GetOpt()->bFixOgg == FALSE) {
		pclArc->Decrypt(pbuf, pInfFile->sizeOrg);
		pclArc->WriteFile(pbuf, pInfFile->sizeOrg);
	}
	else {
		Init(pclArc);

		for (DWORD WriteSize = 0; WriteSize != pInfFile->sizeOrg; ) {
			DWORD PageSize = ReadHed(pbuf);

			// 簡易復号
			if (memcmp(pbuf, "OggS", 4) != 0)
				pclArc->Decrypt(pbuf, PageSize);
			FixCRC(pbuf, PageSize);
			pclArc->WriteFile(pbuf, PageSize);

			WriteSize += PageSize;
			pbuf += PageSize;
		}
	}

	return TRUE;
}

void COgg::Decode(CArcFile* pclArc, LPBYTE buf)
{
	pclArc->OpenFile(_T(".ogg"));

	SFileInfo* pInfFile = pclArc->GetOpenFileInfo();

	for (DWORD WriteSize = 0; WriteSize < pInfFile->sizeOrg; ) {
		VH vheader;

		vheader.page_segments = buf[26];
		memcpy(vheader.segment_table, &buf[27], vheader.page_segments);

		// ページサイズ取得
		DWORD PageSize = GetPageSize(vheader);
		if (WriteSize + PageSize > pInfFile->sizeOrg)
			PageSize = pInfFile->sizeOrg - WriteSize;

		// 簡易復号
		if (memcmp(buf, "OggS", 4) != 0)
			pclArc->Decrypt(buf, PageSize);
		FixCRC(buf, PageSize);
		pclArc->WriteFile(buf, PageSize);

		WriteSize += PageSize;
		buf += PageSize;
	}
}

// OGGのCRCを修正する関数
void COgg::FixCRC(LPBYTE data, DWORD PageSize)
{
	LPDWORD pCRCTable = m_pCRCTable;

	for (int i = 22; i <= 25; i++)
		data[i] = 0;

	DWORD crc_reg = 0;
	for (DWORD i = 0; i < PageSize; i++)
		crc_reg = (crc_reg << 8) ^ pCRCTable[((crc_reg >> 24) & 0xff) ^ data[i]];

	data[22] = (BYTE)(crc_reg & 0xff);
	data[23] = (BYTE)((crc_reg >> 8) & 0xff);
	data[24] = (BYTE)((crc_reg >> 16) & 0xff);
	data[25] = (BYTE)((crc_reg >> 24) & 0xff);
}

void COgg::Init(CArcFile* pclArc)
{
	m_pclArc = pclArc;
}

DWORD COgg::ReadHed()
{
	CArcFile* pclArc = m_pclArc;
	VH& vheader = m_vheader;

	DWORD dwReadSize = pclArc->Read(vheader.pattern, 4);
	dwReadSize = pclArc->Read(&vheader.version, 1);
	dwReadSize = pclArc->Read(&vheader.type, 1);
	dwReadSize = pclArc->Read(vheader.granpos, 8);
	dwReadSize = pclArc->Read(&vheader.serialno, 4);
	dwReadSize = pclArc->Read(&vheader.pageno, 4);
	dwReadSize = pclArc->Read(&vheader.checksum, 4);
	dwReadSize = pclArc->Read(&vheader.page_segments, 1);
	dwReadSize = pclArc->Read(vheader.segment_table, vheader.page_segments);
	if (dwReadSize == 0)
		return 0;

	// セグメントサイズ取得
	m_SegmentSize = GetSegSize(vheader);

	// ページサイズ取得
	m_PageSize = GetPageSize(vheader, m_SegmentSize);

	return (m_PageSize);
}

DWORD COgg::ReadHed(LPBYTE buf)
{
	VH& vheader = m_vheader;

	memcpy(vheader.pattern, &buf[0], 4);
	vheader.version = buf[4];
	vheader.type = buf[5];
	memcpy(vheader.granpos, &buf[6], 8);
	vheader.serialno = *(LPDWORD)&buf[14];
	vheader.pageno = *(LPDWORD)&buf[18];
	vheader.checksum = *(LPDWORD)&buf[22];
	vheader.page_segments = buf[26];
	memcpy(vheader.segment_table, &buf[27], vheader.page_segments);

	// セグメントサイズ取得
	m_SegmentSize = GetSegSize(vheader);

	// ページサイズ取得
	m_PageSize = GetPageSize(vheader, m_SegmentSize);

	return (m_PageSize);
}

DWORD COgg::GetSegSize(VH& vheader)
{
	DWORD SegmentSize = 0;
	for (int i = 0; i < (int)vheader.page_segments; i++)
		SegmentSize += vheader.segment_table[i];
	return (SegmentSize);
}

DWORD COgg::GetPageSize(VH& vheader)
{
	// ページサイズ取得
	DWORD PageSize = 27 + vheader.page_segments + GetSegSize(vheader);
	return (PageSize);
}

DWORD COgg::GetPageSize(VH& vheader, DWORD SegmentSize)
{
	DWORD PageSize = 27 + vheader.page_segments + SegmentSize;
	return (PageSize);
}

void COgg::NextPage()
{
	// 次のOggSまで進める
	m_pclArc->Seek(m_SegmentSize, FILE_CURRENT);
}

void COgg::BackHed()
{
	m_pclArc->Seek(-27 - m_vheader.page_segments, FILE_CURRENT);
}