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#include "StdAfx.h"
#include "ArchiveBuffered.h"
#include <stdexcept>
#include <stdlib.h>
#include <string.h>
#include "mmgr.h"
FileBuffer::FileBuffer() : pos(0), data(NULL)
{
}
FileBuffer::~FileBuffer()
{
}
ABOpenFile_t::~ABOpenFile_t()
{
free(data);
}
inline FileBuffer* CArchiveBuffered::GetOpenFile(int handle)
{
std::map<int, FileBuffer*>::iterator it = fileHandles.find(handle);
if (it == fileHandles.end())
throw std::runtime_error("Unregistered handle. Pass a handle returned by CArchiveBuffered::OpenFile.");
return it->second;
}
CArchiveBuffered::CArchiveBuffered(const std::string& name):
CArchiveBase(name),
curFileHandle(1)
{
}
CArchiveBuffered::~CArchiveBuffered(void)
{
for (std::map<int, FileBuffer*>::iterator i = fileHandles.begin(); i != fileHandles.end(); ++i)
{
delete i->second;
}
}
int CArchiveBuffered::OpenFile(const std::string& fileName)
{
FileBuffer* fh = GetEntireFile(fileName);
if (!fh)
return 0;
curFileHandle++;
fileHandles[curFileHandle] = fh;
return curFileHandle;
}
int CArchiveBuffered::ReadFile(int handle, void* buffer, int numBytes)
{
FileBuffer* of = GetOpenFile(handle);
int maxRead = std::min(numBytes, of->size - of->pos);
memcpy(buffer, of->data + of->pos, maxRead);
of->pos += maxRead;
return maxRead;
}
void CArchiveBuffered::CloseFile(int handle)
{
FileBuffer* of = GetOpenFile(handle);
delete of;
fileHandles.erase(handle);
}
void CArchiveBuffered::Seek(int handle, int pos)
{
FileBuffer* of = GetOpenFile(handle);
of->pos = std::min(pos, of->size);
}
int CArchiveBuffered::Peek(int handle)
{
FileBuffer* of = GetOpenFile(handle);
if (of->pos >= of->size)
return -1;
return of->data[of->pos];
}
bool CArchiveBuffered::Eof(int handle)
{
FileBuffer* of = GetOpenFile(handle);
return (of->pos >= of->size);
}
int CArchiveBuffered::FileSize(int handle)
{
FileBuffer* of = GetOpenFile(handle);
return of->size;
}
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