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#include <rez/io.h>
#include <cerrno>
#include <cstring>
#include <fstream>
#include <iostream>
int rez::io::read(unsigned char &b)
{
std::ifstream::pos_type off = f.tellg();
f.read((char *)&b, sizeof b);
if (!f || f.eof())
{
std::cerr << m_path << ": failed to read at offset " << off
<< ", eof=" << f.eof() << std::endl;
return -1;
}
return 0;
}
int rez::io::check(char byte)
{
char b;
std::ifstream::pos_type off = f.tellg();
f.read(&b, sizeof b);
if (!f || f.eof())
{
std::cerr << m_path << ": failed to read at offset " << off
<< ", eof=" << f.eof() << std::endl;
return -1;
}
else if (b != byte)
{
std::cerr << m_path << ": expected " << byte << " at offset: " << off
<< ", got " << b << std::endl;
return -1;
}
return 0;
}
int rez::io::check(const char *s)
{
while (*s)
if (check(*s++))
return -1;
return 0;
}
int rez::io::read_le(uint32_t &w)
{
std::ifstream::pos_type off = f.tellg();
unsigned char buf[sizeof w];
f.read((char *)buf, sizeof buf);
if (!f || f.eof())
{
std::cerr << m_path << ": failed to read word at offset " << off
<< ", eof=" << f.eof() << std::endl;
return -1;
}
w = buf[0] | (buf[1] << 8) | (buf[2] << 16) | (buf[3] << 24);
return 0;
}
int rez::io::read(std::string &s, unsigned maxlen)
{
unsigned i = 0;
while (i++ < maxlen)
{
unsigned char b;
if (read(b))
return -1;
else if (!b)
return 0;
s += b;
}
std::cerr << m_path << ": exceeded maximum string length (" << maxlen
<< "): \"" << s << "\"" << std::endl;
return -1;
}
int rez::io::read(void *b, size_t n)
{
std::ifstream::pos_type off = f.tellg();
f.read((char *)(b), n);
if (!f)
{
std::cerr << m_path << ": failed to read " << n << " bytes at offset "
<< off << ", eof=" << f.eof() << std::endl;
return -1;
}
return 0;
}
long rez::io::tell()
{
std::ifstream::pos_type offset = f.tellg();
if (!f)
{
std::cerr << m_path << ": failed to retrieve offset" << std::endl;
return -1;
}
return offset;
}
int rez::io::seek(long offset)
{
long cur = f.tellg();
if (!f)
{
std::cerr << m_path << ": failed to tell offset " << std::endl;
return -1;
}
else if (cur != offset)
{
f.seekg(static_cast<std::ifstream::pos_type>(offset));
if (!f)
{
std::cerr << m_path << ": failed to seek to offset " << offset
<< std::endl;
return -1;
}
}
return 0;
}
int rez::io::open()
{
if (!f.is_open())
{
const char *error;
#ifdef _WIN32
error = GetLastError();
#else
error = strerror(errno);
#endif
std::cerr << "Failed to open " << m_path << ": " << error << std::endl;
return -1;
}
return 0;
}
const std::string &rez::io::path() const
{
return m_path;
}
rez::io::io(const char *path) :
f(path, std::ios::binary),
m_path(path)
{
}
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