103 lines
2.5 KiB
C++
103 lines
2.5 KiB
C++
// Copyright (C) 2003 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 "Blob.h"
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#include "CISOBlob.h"
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namespace DiscIO
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{
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CISOFileReader::CISOFileReader(FILE* file__)
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{
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file_ = file__;
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fseek(file_, 0, SEEK_END);
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size = ftell(file_);
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fseek(file_, 0, SEEK_SET);
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memset(&header, 0, sizeof(header));
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fread(&header, sizeof(header), 1, file_);
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CISO_Map_t count = 0;
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int idx;
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for (idx = 0; idx < CISO_MAP_SIZE; idx++)
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ciso_map[idx] = (header.map[idx] == 1) ? count++ : CISO_UNUSED_BLOCK;
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}
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CISOFileReader* CISOFileReader::Create(const char* filename)
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{
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if (IsCISOBlob(filename))
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{
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FILE* f = fopen(filename, "rb");
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return new CISOFileReader(f);
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}
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else
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return NULL;
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}
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CISOFileReader::~CISOFileReader()
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{
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fclose(file_);
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}
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bool CISOFileReader::Read(u64 offset, u64 nbytes, u8* out_ptr)
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{
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u64 bytesRead = 0;
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while (bytesRead < nbytes)
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{
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u32 block = (u32)(offset / header.block_size);
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u32 data_offset = offset % header.block_size;
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u32 bytes_to_read = (u32)min((u64)(header.block_size - data_offset), nbytes);
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if ((block >= CISO_MAP_SIZE) || (ciso_map[block] == CISO_UNUSED_BLOCK))
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{
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memset(out_ptr, 0, bytes_to_read);
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out_ptr += bytes_to_read;
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offset += bytes_to_read;
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bytesRead += bytes_to_read;
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}
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else
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{
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// calcualte the base address
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u64 file_off = CISO_HEAD_SIZE + ciso_map[block] * (u64)header.block_size + data_offset;
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if (fseeko(file_, (long)file_off, SEEK_SET) != 0)
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return false;
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if (fread(out_ptr, 1, bytes_to_read, file_) != bytes_to_read)
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return false;
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out_ptr += bytes_to_read;
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offset += bytes_to_read;
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bytesRead += bytes_to_read;
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}
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}
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return true;
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}
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bool IsCISOBlob(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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CISO_Head_t header;
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fread(&header, sizeof(header), 1, f);
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fclose(f);
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return (memcmp(header.magic, CISO_MAGIC, sizeof(header.magic)) == 0);
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}
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} // namespace
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