tibia-client/src/framework/core/filestream.cpp

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/*
* Copyright (c) 2010-2012 OTClient <https://github.com/edubart/otclient>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "filestream.h"
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#include "binarytree.h"
#include <framework/core/application.h>
#include <physfs.h>
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FileStream::FileStream(const std::string& name, PHYSFS_File *fileHandle, bool writeable) :
m_name(name),
m_fileHandle(fileHandle),
m_pos(0),
m_writeable(writeable),
m_caching(false)
{
}
FileStream::~FileStream()
{
assert(!g_app.isTerminated());
close();
}
void FileStream::cache()
{
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m_caching = true;
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if(!m_writeable) {
if(!m_fileHandle)
return;
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// cache entire file into data buffer
m_pos = PHYSFS_tell(m_fileHandle);
PHYSFS_seek(m_fileHandle, 0);
int size = PHYSFS_fileLength(m_fileHandle);
m_data.resize(size);
if(PHYSFS_read(m_fileHandle, m_data.data(), size, 1) == -1)
throwError("unable to read file data", true);
PHYSFS_close(m_fileHandle);
m_fileHandle = nullptr;
}
}
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void FileStream::close()
{
if(m_fileHandle) {
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if(!PHYSFS_close(m_fileHandle))
throwError("close failed", true);
m_fileHandle = nullptr;
}
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m_data.clear();
m_pos = 0;
}
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void FileStream::flush()
{
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if(!m_writeable)
throwError("filestream is not writeable");
if(m_fileHandle) {
if(m_caching) {
if(!PHYSFS_seek(m_fileHandle, 0))
throwError("flush seek failed", true);
uint len = m_data.size();
if(PHYSFS_write(m_fileHandle, m_data.data(), 1, len) != len)
throwError("flush write failed", true);
}
if(PHYSFS_flush(m_fileHandle) == 0)
throwError("flush failed", true);
}
}
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int FileStream::read(void *buffer, uint32 size, uint32 nmemb)
{
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if(!m_caching) {
int res = PHYSFS_read(m_fileHandle, buffer, size, nmemb);
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if(res == -1)
throwError("read failed", true);
return res;
} else {
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uint maxReadPos = m_data.size()-1;
int writePos = 0;
uint8 *outBuffer = (uint8*)buffer;
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for(uint i=0;i<nmemb;++i) {
if(m_pos+size > maxReadPos)
return i;
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for(uint j=0;j<size;++j)
outBuffer[writePos++] = m_data[m_pos++];
}
return nmemb;
}
}
void FileStream::write(const void *buffer, uint32 count)
{
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if(!m_caching) {
if(PHYSFS_write(m_fileHandle, buffer, 1, count) != count)
throwError("write failed", true);
} else {
m_data.grow(m_pos + count);
memcpy(&m_data[m_pos], buffer, count);
m_pos += count;
}
}
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void FileStream::seek(uint32 pos)
{
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if(!m_caching) {
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if(!PHYSFS_seek(m_fileHandle, pos))
throwError("seek failed", true);
} else {
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if(pos > m_data.size())
throwError("seek failed");
m_pos = pos;
}
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}
void FileStream::skip(uint len)
{
seek(tell() + len);
}
int FileStream::size()
{
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if(!m_caching)
return PHYSFS_fileLength(m_fileHandle);
else
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return m_data.size();
}
int FileStream::tell()
{
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if(!m_caching)
return PHYSFS_tell(m_fileHandle);
else
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return m_pos;
}
uint8 FileStream::getU8()
{
uint8 v = 0;
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if(!m_caching) {
if(PHYSFS_read(m_fileHandle, &v, 1, 1) != 1)
throwError("read failed", true);
} else {
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if(m_pos+1 > m_data.size())
throwError("read failed");
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v = m_data[m_pos];
m_pos += 1;
}
return v;
}
uint16 FileStream::getU16()
{
uint16 v = 0;
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if(!m_caching) {
if(PHYSFS_readULE16(m_fileHandle, &v) == 0)
throwError("read failed", true);
} else {
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if(m_pos+2 > m_data.size())
throwError("read failed");
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v = stdext::readLE16(&m_data[m_pos]);
m_pos += 2;
}
return v;
}
uint32 FileStream::getU32()
{
uint32 v = 0;
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if(!m_caching) {
if(PHYSFS_readULE32(m_fileHandle, &v) == 0)
throwError("read failed", true);
} else {
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if(m_pos+4 > m_data.size())
throwError("read failed");
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v = stdext::readLE32(&m_data[m_pos]);
m_pos += 4;
}
return v;
}
uint64 FileStream::getU64()
{
uint64 v = 0;
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if(!m_caching) {
if(PHYSFS_readULE64(m_fileHandle, (PHYSFS_uint64*)&v) == 0)
throwError("read failed", true);
} else {
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if(m_pos+8 > m_data.size())
throwError("read failed");
v = stdext::readLE64(&m_data[m_pos]);
m_pos += 8;
}
return v;
}
std::string FileStream::getString()
{
std::string str;
uint16 len = getU16();
if(len > 0 && len < 8192) {
char buffer[8192];
if(m_fileHandle) {
if(PHYSFS_read(m_fileHandle, buffer, 1, len) == 0)
throwError("read failed", true);
else
str = std::string(buffer, len);
} else {
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if(m_pos+len > m_data.size()) {
throwError("read failed");
return 0;
}
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str = std::string((char*)&m_data[m_pos], len);
m_pos += len;
}
} else if(len != 0)
throwError("read failed because string is too big");
return str;
}
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BinaryTreePtr FileStream::getBinaryTree()
{
BinaryTreePtr root = BinaryTreePtr(new BinaryTree);
uint8 byte = getU8();
if(byte == BINARYTREE_NODE_START)
root->unserialize(asFileStream());
else
stdext::throw_exception(stdext::format("failed to read node start (getBinaryTree): %d", byte));
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return root;
}
void FileStream::addU8(uint8 v)
{
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if(!m_caching) {
if(PHYSFS_write(m_fileHandle, &v, 1, 1) != 1)
throwError("write failed", true);
} else {
m_data.add(v);
m_pos++;
}
}
void FileStream::addU16(uint16 v)
{
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if(!m_caching) {
if(PHYSFS_writeULE16(m_fileHandle, v) == 0)
throwError("write failed", true);
} else {
m_data.grow(m_pos + 2);
stdext::writeLE16(&m_data[m_pos], v);
m_pos += 2;
}
}
void FileStream::addU32(uint32 v)
{
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if(!m_caching) {
if(PHYSFS_writeULE32(m_fileHandle, v) == 0)
throwError("write failed", true);
} else {
m_data.grow(m_pos + 4);
stdext::writeLE32(&m_data[m_pos], v);
m_pos += 4;
}
}
void FileStream::addU64(uint64 v)
{
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if(!m_caching) {
if(PHYSFS_writeULE64(m_fileHandle, v) == 0)
throwError("write failed", true);
} else {
m_data.grow(m_pos + 8);
stdext::writeLE64(&m_data[m_pos], v);
m_pos += 8;
}
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}
void FileStream::addString(const std::string& v)
{
addU16(v.length());
write(v.c_str(), v.length());
}
void FileStream::throwError(const std::string& message, bool physfsError)
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{
std::string completeMessage = stdext::format("in file '%s': %s", m_name, message);
if(physfsError)
completeMessage += std::string(": ") + PHYSFS_getLastError();
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stdext::throw_exception(completeMessage);
}