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streamWrapper.cxx
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268 lines (243 loc) · 7.04 KB
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/**
* PANDA 3D SOFTWARE
* Copyright (c) Carnegie Mellon University. All rights reserved.
*
* All use of this software is subject to the terms of the revised BSD
* license. You should have received a copy of this license along
* with this source code in a file named "LICENSE."
*
* @file streamWrapper.cxx
* @author drose
* @date 2008-11-11
*/
#include "streamWrapper.h"
using std::streamsize;
/**
*
*/
IStreamWrapper::
~IStreamWrapper() {
if (_owns_pointer) {
// For some reason--compiler bug in gcc 3.2?--explicitly deleting the
// stream pointer does not call the appropriate global delete function;
// instead apparently calling the system delete function. So we call the
// delete function by hand instead.
#if !defined(WIN32_VC) && !defined(USE_MEMORY_NOWRAPPERS) && defined(REDEFINE_GLOBAL_OPERATOR_NEW)
_istream->~istream();
(*global_operator_delete)(_istream);
#else
delete _istream;
#endif
}
}
/**
* Atomically reads a number of bytes from the stream, without error
* detection. If fewer bytes than requested are read, quietly fills the
* remaining bytes with 0.
*/
void IStreamWrapper::
read(char *buffer, streamsize num_bytes) {
acquire();
_istream->clear();
_istream->read(buffer, num_bytes);
streamsize read_bytes = _istream->gcount();
while (read_bytes < num_bytes) {
// Fewer bytes than expected were read. Maybe more will be coming later.
release();
thread_yield();
acquire();
_istream->read(buffer + read_bytes, num_bytes - read_bytes);
streamsize this_read_bytes = _istream->gcount();
assert(this_read_bytes <= num_bytes - read_bytes);
read_bytes += this_read_bytes;
if (this_read_bytes == 0) {
// No, don't expect any more.
memset(buffer + read_bytes, 0, num_bytes - read_bytes);
break;
}
}
assert(read_bytes <= num_bytes);
release();
}
/**
* Atomically reads a number of bytes from the stream. Returns the number of
* bytes actually read.
*/
void IStreamWrapper::
read(char *buffer, streamsize num_bytes, streamsize &read_bytes) {
acquire();
_istream->clear();
_istream->read(buffer, num_bytes);
read_bytes = _istream->gcount();
assert(read_bytes <= num_bytes);
release();
}
/**
* Atomically reads a number of bytes from the stream. Returns the number of
* bytes actually read, and whether an eof condition was detected by the
* operation.
*/
void IStreamWrapper::
read(char *buffer, streamsize num_bytes, streamsize &read_bytes, bool &eof) {
acquire();
_istream->clear();
_istream->read(buffer, num_bytes);
read_bytes = _istream->gcount();
assert(read_bytes <= num_bytes);
eof = _istream->eof() || _istream->fail();
release();
}
/**
* Atomically seeks to a particular offset from the beginning of the file, and
* reads a number of bytes from the stream. Returns the number of bytes
* actually read, and whether an eof condition was detected by the operation.
*/
void IStreamWrapper::
seek_read(streamsize pos, char *buffer, streamsize num_bytes,
streamsize &read_bytes, bool &eof) {
acquire();
_istream->clear();
_istream->seekg(pos);
_istream->read(buffer, num_bytes);
read_bytes = _istream->gcount();
assert(read_bytes <= num_bytes);
eof = _istream->eof() || _istream->fail();
release();
}
/**
* Atomically seeks to EOF and returns the gpos there; that is, returns the
* file size. Note that the EOF might have been moved in another thread by
* the time this method returns.
*/
streamsize IStreamWrapper::
seek_gpos_eof() {
streamsize pos;
acquire();
_istream->seekg(0, std::ios::end);
pos = _istream->tellg();
release();
return pos;
}
/**
*
*/
OStreamWrapper::
~OStreamWrapper() {
if (_owns_pointer) {
// For some reason--compiler bug in gcc 3.2?--explicitly deleting the
// stream pointer does not call the appropriate global delete function;
// instead apparently calling the system delete function. So we call the
// delete function by hand instead.
#if !defined(WIN32_VC) && !defined(USE_MEMORY_NOWRAPPERS) && defined(REDEFINE_GLOBAL_OPERATOR_NEW)
_ostream->~ostream();
(*global_operator_delete)(_ostream);
#else
delete _ostream;
#endif
}
}
/**
* Atomically writes a number of bytes to the stream, without error detection.
*/
void OStreamWrapper::
write(const char *buffer, streamsize num_bytes) {
acquire();
_ostream->write(buffer, num_bytes);
release();
}
/**
* Atomically writes a number of bytes to the stream. Returns whether a
* failure condition was detected by the operation.
*/
void OStreamWrapper::
write(const char *buffer, streamsize num_bytes, bool &fail) {
acquire();
_ostream->clear();
_ostream->write(buffer, num_bytes);
fail = _ostream->fail();
release();
}
/**
* Atomically seeks to a particular offset from the beginning of the file, and
* writes a number of bytes to the stream. Returns whether a failure
* condition was detected by the operation.
*/
void OStreamWrapper::
seek_write(streamsize pos, const char *buffer, streamsize num_bytes,
bool &fail) {
acquire();
_ostream->clear();
_ostream->seekp(pos);
#ifdef WIN32_VC
if (_ostream->fail() && _stringstream_hack && pos == 0) {
// Ignore an unsuccessful attempt to seekp(0) if _stringstream_hack is
// true.
_ostream->clear();
}
#endif // WIN32_VC
_ostream->write(buffer, num_bytes);
fail = _ostream->fail();
release();
}
/**
* Atomically seeks to the end of the file, and writes a number of bytes to
* the stream. Returns whether a failure condition was detected by the
* operation.
*/
void OStreamWrapper::
seek_eof_write(const char *buffer, streamsize num_bytes, bool &fail) {
acquire();
_ostream->clear();
_ostream->seekp(0, std::ios::end);
#ifdef WIN32_VC
if (_ostream->fail() && _stringstream_hack) {
// Ignore an unsuccessful attempt to seekp(0) if _stringstream_hack is
// true.
_ostream->clear();
}
#endif // WIN32_VC
_ostream->write(buffer, num_bytes);
fail = _ostream->fail();
release();
}
/**
* Atomically seeks to EOF and returns the ppos there; that is, returns the
* file size. Note that the EOF might have been moved in another thread by
* the time this method returns.
*/
streamsize OStreamWrapper::
seek_ppos_eof() {
streamsize pos;
acquire();
_ostream->seekp(0, std::ios::end);
#ifdef WIN32_VC
if (_ostream->fail() && _stringstream_hack) {
// Ignore an unsuccessful attempt to seekp(0) if _stringstream_hack is
// true.
_ostream->clear();
release();
return 0;
}
#endif // WIN32_VC
pos = _ostream->tellp();
release();
return pos;
}
/**
*
*/
StreamWrapper::
~StreamWrapper() {
if (_owns_pointer) {
// For some reason--compiler bug in gcc 3.2?--explicitly deleting the
// stream pointer does not call the appropriate global delete function;
// instead apparently calling the system delete function. So we call the
// delete function by hand instead.
#if !defined(WIN32_VC) && !defined(USE_MEMORY_NOWRAPPERS) && defined(REDEFINE_GLOBAL_OPERATOR_NEW)
_iostream->~iostream();
(*global_operator_delete)(_iostream);
#else
delete _iostream;
#endif
}
}