89 lines
2.3 KiB
C++
89 lines
2.3 KiB
C++
// Copyright (C) 2003 Dolphin Project.
|
|
|
|
// This program is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation, version 2.0.
|
|
|
|
// This program is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License 2.0 for more details.
|
|
|
|
// A copy of the GPL 2.0 should have been included with the program.
|
|
// If not, see http://www.gnu.org/licenses/
|
|
|
|
// Official SVN repository and contact information can be found at
|
|
// http://code.google.com/p/dolphin-emu/
|
|
|
|
#include "Blob.h"
|
|
#include "CISOBlob.h"
|
|
|
|
namespace DiscIO
|
|
{
|
|
|
|
CISOFileReader::CISOFileReader(std::FILE* file)
|
|
: m_file(file)
|
|
{
|
|
m_size = m_file.GetSize();
|
|
|
|
memset(&header, 0, sizeof(header));
|
|
m_file.ReadArray(&header, 1);
|
|
|
|
CISO_Map_t count = 0;
|
|
int idx;
|
|
for (idx = 0; idx < CISO_MAP_SIZE; idx++)
|
|
ciso_map[idx] = (header.map[idx] == 1) ? count++ : CISO_UNUSED_BLOCK;
|
|
}
|
|
|
|
CISOFileReader* CISOFileReader::Create(const char* filename)
|
|
{
|
|
if (IsCISOBlob(filename))
|
|
{
|
|
File::IOFile f(filename, "rb");
|
|
return new CISOFileReader(f.ReleaseHandle());
|
|
}
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
bool CISOFileReader::Read(u64 offset, u64 nbytes, u8* out_ptr)
|
|
{
|
|
u64 bytesRead = 0;
|
|
while (bytesRead < nbytes)
|
|
{
|
|
u32 block = (u32)(offset / header.block_size);
|
|
u32 data_offset = offset % header.block_size;
|
|
u32 bytes_to_read = (u32)min((u64)(header.block_size - data_offset), nbytes);
|
|
if ((block >= CISO_MAP_SIZE) || (ciso_map[block] == CISO_UNUSED_BLOCK))
|
|
{
|
|
memset(out_ptr, 0, bytes_to_read);
|
|
out_ptr += bytes_to_read;
|
|
offset += bytes_to_read;
|
|
bytesRead += bytes_to_read;
|
|
}
|
|
else
|
|
{
|
|
// calcualte the base address
|
|
u64 file_off = CISO_HEAD_SIZE + ciso_map[block] * (u64)header.block_size + data_offset;
|
|
|
|
if (!(m_file.Seek(file_off, SEEK_SET) && m_file.ReadBytes(out_ptr, bytes_to_read)))
|
|
return false;
|
|
|
|
out_ptr += bytes_to_read;
|
|
offset += bytes_to_read;
|
|
bytesRead += bytes_to_read;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool IsCISOBlob(const char* filename)
|
|
{
|
|
File::IOFile f(filename, "rb");
|
|
|
|
CISO_Head_t header;
|
|
return (f.ReadArray(&header, 1) && (memcmp(header.magic, CISO_MAGIC, sizeof(header.magic)) == 0));
|
|
}
|
|
|
|
} // namespace
|