182 lines
3.4 KiB
C++
Executable File
182 lines
3.4 KiB
C++
Executable File
/*
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* (C) 2015 Dirk W. Hoffmann. All rights reserved.
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*
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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; either version 2 of the License, org
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* (at your option) any later version.
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*
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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 for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "G64Archive.h"
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G64Archive::G64Archive()
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{
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data = NULL;
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dealloc();
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}
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G64Archive::~G64Archive()
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{
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dealloc();
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}
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bool
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G64Archive::isG64File(const char *filename)
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{
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/* "GCR-1541" + Version number (0x00) */
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int magic_bytes[] = { 0x47, 0x43, 0x52, 0x2D, 0x31, 0x35, 0x34, 0x31, 0x00, EOF };
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assert(filename != NULL);
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if (!checkFileSuffix(filename, ".G64") && !checkFileSuffix(filename, ".g64"))
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return false;
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if (!checkFileSize(filename, 0x02AC, -1))
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return false;
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if (!checkFileHeader(filename, magic_bytes))
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return false;
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return true;
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}
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G64Archive *
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G64Archive::archiveFromG64File(const char *filename)
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{
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G64Archive *archive;
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fprintf(stderr, "Loading G64 archive from G64 file...\n");
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archive = new G64Archive();
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if (!archive->readFromFile(filename)) {
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fprintf(stderr, "Failed to load archive\n");
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delete archive;
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archive = NULL;
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}
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return archive;
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}
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void G64Archive::dealloc()
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{
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if (data) free(data);
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data = NULL;
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size = 0;
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fp = -1;
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fp_eof = -1;
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}
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bool
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G64Archive::fileIsValid(const char *filename)
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{
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return G64Archive::isG64File(filename);
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}
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bool
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G64Archive::readFromBuffer(const uint8_t *buffer, unsigned length)
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{
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if ((data = (uint8_t *)malloc(length)) == NULL)
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return false;
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memcpy(data, buffer, length);
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size = length;
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return true;
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}
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unsigned
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G64Archive::writeToBuffer(uint8_t *buffer)
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{
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assert(data != NULL);
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if (buffer) {
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memcpy(buffer, data, size);
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}
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return size;
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}
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const char *
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G64Archive::getName()
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{
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return "G64 archive";
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}
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int
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G64Archive::getNumberOfItems()
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{
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return 84;
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}
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int
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G64Archive::getStartOfItem(int n)
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{
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if (n < 0 || n >= 84)
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return -1;
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int offset = 0x00C + (4 * n);
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return LO_LO_HI_HI(data[offset], data[offset+1], data[offset+2], data[offset+3]);
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}
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int
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G64Archive::getSizeOfItem(int n)
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{
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int offset = getStartOfItem(n);
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return offset ? (LO_HI(data[offset], data[offset+1])) : 0;
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}
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const char *
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G64Archive::getNameOfItem(int n)
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{
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if (n < 0 || n >= 84)
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return "";
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if (n % 2 == 0) {
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sprintf(name, "Track %d", (n / 2) + 1);
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} else {
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sprintf(name, "Track %d.5", (n / 2) + 1);
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}
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return name;
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}
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const char *
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G64Archive::getTypeOfItem(int n)
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{
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return ""; // (n % 2 == 0) ? "Full" : "Half";
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}
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void
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G64Archive::selectItem(int n)
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{
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fp = getStartOfItem(n);
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fp += 2; // skip length information
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fp_eof = fp + getSizeOfItem(n);
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fprintf(stderr, "fp = %d, f_eof = %d\n", fp, fp_eof);
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}
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int
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G64Archive::getByte()
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{
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int result;
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if (fp < 0)
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return -1;
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// get byte
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result = data[fp++];
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// check for end of file
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if (fp == fp_eof)
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fp = -1;
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return result;
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}
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