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Avoid opening and closing BArchive files all the time

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svn-id: r45325
This commit is contained in:
Robert Špalek 2009-10-22 06:05:34 +00:00
parent 89febd360f
commit 958bc7ba81
2 changed files with 34 additions and 46 deletions
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78
engines/draci/barchive.cpp
View File

@ -24,7 +24,6 @@
*/
#include "common/debug.h"
#include "common/file.h"
#include "common/str.h"
#include "common/stream.h"
@ -69,24 +68,22 @@ void BArchive::openDFW(const Common::String &path) {
uint16 tableSize;
byte buf[2];
Common::File f;
f.open(path);
if (!f.isOpen()) {
_f.open(path);
if (!_f.isOpen()) {
debugC(2, kDraciArchiverDebugLevel, "Error opening file");
return;
}
_fileCount = f.readUint16LE();
tableSize = f.readUint16LE();
_fileCount = _f.readUint16LE();
tableSize = _f.readUint16LE();
f.read(buf, 2);
_f.read(buf, 2);
if (memcmp(buf, _dfwMagicNumber, 2) == 0) {
debugC(2, kDraciArchiverDebugLevel, "Success");
_isDFW = true;
} else {
debugC(2, kDraciArchiverDebugLevel, "Not a DFW archive");
f.close();
_f.close();
return;
}
@ -94,7 +91,7 @@ void BArchive::openDFW(const Common::String &path) {
// Read in index table
table = new byte[tableSize];
f.read(table, tableSize);
_f.read(table, tableSize);
// Read in file headers, but do not read the actual data yet
// The data will be read on demand to save memory
@ -105,11 +102,11 @@ void BArchive::openDFW(const Common::String &path) {
_files[i]._offset = tableReader.readUint32LE();
// Seek to the current file
f.seek(_files[i]._offset);
_f.seek(_files[i]._offset);
_files[i]._length = f.readUint16LE(); // Read in uncompressed length
f.readUint16LE(); // Compressed length again (already read from the index table)
_files[i]._stopper = f.readByte();
_files[i]._length = _f.readUint16LE(); // Read in uncompressed length
_f.readUint16LE(); // Compressed length again (already read from the index table)
_files[i]._stopper = _f.readByte();
_files[i]._data = NULL; // File data will be read in on demand
_files[i]._crc = 0; // Dummy value; not used in DFW archives
@ -120,7 +117,6 @@ void BArchive::openDFW(const Common::String &path) {
// Cleanup
delete[] table;
f.close();
}
/**
@ -152,15 +148,14 @@ void BArchive::openArchive(const Common::String &path) {
byte buf[4];
byte *footer;
uint32 footerOffset, footerSize;
Common::File f;
// Close previously opened archive (if any)
closeArchive();
debugCN(2, kDraciArchiverDebugLevel, "Loading archive %s: ", path.c_str());
f.open(path);
if (f.isOpen()) {
_f.open(path);
if (_f.isOpen()) {
debugC(2, kDraciArchiverDebugLevel, "Success");
} else {
debugC(2, kDraciArchiverDebugLevel, "Error");
@ -173,7 +168,7 @@ void BArchive::openArchive(const Common::String &path) {
// Read archive header
debugCN(2, kDraciArchiverDebugLevel, "Checking for BAR magic number: ");
f.read(buf, 4);
_f.read(buf, 4);
if (memcmp(buf, _magicNumber, 4) == 0) {
debugC(2, kDraciArchiverDebugLevel, "Success");
@ -182,7 +177,7 @@ void BArchive::openArchive(const Common::String &path) {
} else {
debugC(2, kDraciArchiverDebugLevel, "Not a BAR archive");
debugCN(2, kDraciArchiverDebugLevel, "Retrying as DFW: ");
f.close();
_f.close();
// Try to open as DFW
openDFW(_path);
@ -190,17 +185,17 @@ void BArchive::openArchive(const Common::String &path) {
return;
}
_fileCount = f.readUint16LE();
footerOffset = f.readUint32LE();
footerSize = f.size() - footerOffset;
_fileCount = _f.readUint16LE();
footerOffset = _f.readUint32LE();
footerSize = _f.size() - footerOffset;
debugC(2, kDraciArchiverDebugLevel, "Archive info: %d files, %d data bytes",
_fileCount, footerOffset - _archiveHeaderSize);
// Read in footer
footer = new byte[footerSize];
f.seek(footerOffset);
f.read(footer, footerSize);
_f.seek(footerOffset);
_f.read(footer, footerSize);
Common::MemoryReadStream reader(footer, footerSize);
// Read in file headers, but do not read the actual data yet
@ -211,19 +206,19 @@ void BArchive::openArchive(const Common::String &path) {
uint32 fileOffset;
fileOffset = reader.readUint32LE();
f.seek(fileOffset); // Seek to next file in archive
_f.seek(fileOffset); // Seek to next file in archive
_files[i]._compLength = f.readUint16LE(); // Compressed size
_files[i]._compLength = _f.readUint16LE(); // Compressed size
// should be the same as uncompressed
_files[i]._length = f.readUint16LE(); // Original size
_files[i]._length = _f.readUint16LE(); // Original size
_files[i]._offset = fileOffset; // Offset of file from start
assert(f.readByte() == 0 &&
assert(_f.readByte() == 0 &&
"Compression type flag is non-zero (file is compressed)");
_files[i]._crc = f.readByte(); // CRC checksum of the file
_files[i]._crc = _f.readByte(); // CRC checksum of the file
_files[i]._data = NULL; // File data will be read in on demand
_files[i]._stopper = 0; // Dummy value; not used in BAR files, needed in DFW
}
@ -235,7 +230,6 @@ void BArchive::openArchive(const Common::String &path) {
_opened = true;
delete[] footer;
f.close();
}
/**
@ -256,6 +250,7 @@ void BArchive::closeArchive(void) {
}
delete[] _files;
_f.close();
_opened = false;
_files = NULL;
@ -271,21 +266,16 @@ void BArchive::closeArchive(void) {
* Should not be called directly.
*/
BAFile *BArchive::loadFileBAR(uint i) {
Common::File f;
// Else open archive and read in requested file
f.open(_path);
if (f.isOpen()) {
debugC(2, kDraciArchiverDebugLevel, "Success");
} else {
if (!_f.isOpen()) {
debugC(2, kDraciArchiverDebugLevel, "Error");
return NULL;
}
// Read in the file (without the file header)
f.seek(_files[i]._offset + _fileHeaderSize);
_f.seek(_files[i]._offset + _fileHeaderSize);
_files[i]._data = new byte[_files[i]._length];
f.read(_files[i]._data, _files[i]._length);
_f.read(_files[i]._data, _files[i]._length);
// Calculate CRC
byte tmp = 0;
@ -309,21 +299,17 @@ BAFile *BArchive::loadFileBAR(uint i) {
* Should not be called directly.
*/
BAFile *BArchive::loadFileDFW(uint i) {
Common::File f;
byte *buf;
// Else open archive and read in requested file
f.open(_path);
if (f.isOpen()) {
debugC(2, kDraciArchiverDebugLevel, "Success");
} else {
if (!_f.isOpen()) {
debugC(2, kDraciArchiverDebugLevel, "Error");
return NULL;
}
// Seek to raw data of the file
// Five bytes are for the header (uncompressed and compressed length, stopper mark)
f.seek(_files[i]._offset + 5);
_f.seek(_files[i]._offset + 5);
// Since we are seeking directly to raw data, we subtract 3 bytes from the length
// (to take account the compressed length and stopper mark)
@ -338,7 +324,7 @@ BAFile *BArchive::loadFileDFW(uint i) {
buf = new byte[compressedLength];
// Read in file data into the buffer
f.read(buf, compressedLength);
_f.read(buf, compressedLength);
// Allocate the space for the uncompressed file
byte *dst;

2
engines/draci/barchive.h
View File

@ -27,6 +27,7 @@
#define DRACI_BARCHIVE_H
#include "common/str.h"
#include "common/file.h"
namespace Draci {
@ -87,6 +88,7 @@ private:
uint _fileCount; ///< Number of files in archive
bool _isDFW; ///< True if the archive is in DFW format, false otherwise
bool _opened; ///< True if the archive is opened, false otherwise
Common::File _f; ///< Opened file handle
void openDFW(const Common::String &path);
BAFile *loadFileDFW(uint i);