The Tor Browser: nsprpub/lib/prstreams/prstrms.cpp@6474c204b198 (annotated)

nsprpub/lib/prstreams/prstrms.cpp@6474c204b198 (annotated)

nsprpub/lib/prstreams/prstrms.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 /*
  * Robin J. Maxwell 11-22-96
  * Fredrik Roubert <roubert@google.com> 2010-07-23
  * Matt Austern <austern@google.com> 2010-07-23
  */
 #include "prstrms.h"
 #include <cstdio>
 #include <cstring>
 #include <ios>
 #include <new>
 using std::ios_base;
 using std::iostream;
 using std::istream;
 using std::nothrow;
 using std::ostream;
 using std::streambuf;
 using std::streamsize;
 PRfilebuf::PRfilebuf():
     _fd(NULL),
     _opened(false),
     _allocated(false),
     _unbuffered(false),
     _user_buf(false),
     _buf_base(NULL),
     _buf_end(NULL) { }
 PRfilebuf::PRfilebuf(PRFileDesc *fd):
     _fd(fd),
     _opened(false),
     _allocated(false),
     _unbuffered(false),
     _user_buf(false),
     _buf_base(NULL),
     _buf_end(NULL) { }
 PRfilebuf::PRfilebuf(PRFileDesc *fd, char_type *ptr, streamsize len):
     _fd(fd),
     _opened(false),
     _allocated(false),
     _unbuffered(false),
     _user_buf(false),
     _buf_base(NULL),
     _buf_end(NULL)
 {
     setbuf(ptr, len);
 }
 PRfilebuf::~PRfilebuf()
 {
     if (_opened) {
         close();
     } else {
         sync();
     }
     if (_allocated) {
         delete _buf_base;
     }
 }
 PRfilebuf *PRfilebuf::open(
     const char *name, ios_base::openmode flags, PRIntn mode)
 {
     if (_fd != NULL) {
         return NULL;  // Error if already open.
     }
     // Translate flags argument.
     PRIntn prflags = 0;
     bool ate = (flags & ios_base::ate) != 0;
     flags &= ~(ios_base::ate | ios_base::binary);
     // TODO: The flag PR_CREATE_FILE should probably be used for the cases
     // (out), (out|app), (out|trunc) and (in|out|trunc) as the C++ standard
     // specifies that these cases should open files 'as if by using fopen with
     // "w"'. But adding that flag here will cause the unit test to leave files
     // behind after running (which might or might not be an error in the unit
     // test) so the matter needs further investigation before any changes are
     // made. The old prstreams implementation used the non-standard flag
     // ios::nocreate to control the use of PR_CREATE_FILE.
     if (flags == (ios_base::out)) {
         prflags = PR_WRONLY | PR_TRUNCATE;
     } else if (flags == (ios_base::out | ios_base::app)) {
         prflags = PR_RDWR | PR_APPEND;
     } else if (flags == (ios_base::out | ios_base::trunc)) {
         prflags = PR_WRONLY | PR_TRUNCATE;
     } else if (flags == (ios_base::in)) {
         prflags = PR_RDONLY;
     } else if (flags == (ios_base::in | ios_base::out)) {
         prflags = PR_RDWR;
     } else if (flags == (ios_base::in | ios_base::out | ios_base::trunc)) {
         prflags = PR_RDWR | PR_TRUNCATE;
     } else {
         return NULL;  // Unrecognized flag combination.
     }
     if ((_fd = PR_Open(name, prflags, mode)) == NULL) {
         return NULL;
     }
     _opened = true;
     if (ate &&
             seekoff(0, ios_base::end, flags) == pos_type(traits_type::eof())) {
         close();
         return NULL;
     }
     return this;
 }
 PRfilebuf *PRfilebuf::attach(PRFileDesc *fd)
 {
     if (_fd != NULL) {
         return NULL;  // Error if already open.
     }
     _opened = false;
     _fd = fd;
     return this;
 }
 PRfilebuf *PRfilebuf::close()
 {
     if (_fd == NULL)
         return NULL;
     int status = sync();
     if (PR_Close(_fd) == PR_FAILURE ||
             traits_type::eq_int_type(status, traits_type::eof())) {
         return NULL;
     }
     _fd = NULL;
     return this;
 }
 streambuf *PRfilebuf::setbuf(char_type *ptr, streamsize len)
 {
     if (is_open() && _buf_end) {
         return NULL;
     }
     if (!ptr || len <= 0) {
         _unbuffered = true;
     } else {
         setb(ptr, ptr + len, false);
     }
     return this;
 }
 streambuf::pos_type PRfilebuf::seekoff(
     off_type offset, ios_base::seekdir dir, ios_base::openmode /*flags*/)
 {
     if (PR_GetDescType(_fd) != PR_DESC_FILE) {
         return traits_type::eof();
     }
     PRSeekWhence whence;
     PRInt64 pos;
     switch (dir) {
         case ios_base::beg: whence = PR_SEEK_SET; break;
         case ios_base::cur: whence = PR_SEEK_CUR; break;
         case ios_base::end: whence = PR_SEEK_END; break;
         default:
             return traits_type::eof();  // This should never happen.
     }
     if (traits_type::eq_int_type(sync(), traits_type::eof())) {
         return traits_type::eof();
     }
     if ((pos = PR_Seek64(_fd, offset, whence)) == -1) {
         return traits_type::eof();
     }
     return pos;
 }
 int PRfilebuf::sync()
 {
     if (_fd == NULL) {
         return traits_type::eof();
     }
     if (!_unbuffered) {
         // Sync write area.
         PRInt32 waiting;
         if ((waiting = pptr() - pbase()) != 0) {
             PRInt32 nout;
             if ((nout = PR_Write(_fd, pbase(), waiting)) != waiting) {
                 if (nout > 0) {
                     // Should set _pptr -= nout.
                     pbump(-nout);
                     memmove(pbase(), pbase() + nout, waiting - nout);
                 }
                 return traits_type::eof();
             }
         }
         setp(NULL, NULL);  // Empty put area.
         if (PR_GetDescType(_fd) == PR_DESC_FILE) {
             // Sockets can't seek; don't need this.
             PROffset64 avail;
             if ((avail = in_avail()) > 0) {
                 if (PR_Seek64(_fd, -avail, PR_SEEK_CUR) != -1) {
                     return traits_type::eof();
                 }
             }
         }
         setg(NULL, NULL, NULL);  // Empty get area.
     }
     return 0;
 }
 streambuf::int_type PRfilebuf::underflow()
 {
     PRInt32 count;
     char_type byte;
     if (gptr() != NULL && gptr() < egptr()) {
         return traits_type::to_int_type(*gptr());
     }
     // Make sure there is a reserve area.
     if (!_unbuffered && _buf_base == NULL && !allocate()) {
         return traits_type::eof();
     }
     // Sync before new buffer created below.
     if (traits_type::eq_int_type(sync(), traits_type::eof())) {
         return traits_type::eof();
     }
     if (_unbuffered) {
         if (PR_Read(_fd, &byte, 1) <= 0) {
             return traits_type::eof();
         }
         return traits_type::to_int_type(byte);
     }
     if ((count = PR_Read(_fd, _buf_base, _buf_end - _buf_base)) <= 0) {
         return traits_type::eof();  // Reached EOF.
     }
     setg(_buf_base, _buf_base, _buf_base + count);
     return traits_type::to_int_type(*gptr());
 }
 streambuf::int_type PRfilebuf::overflow(int_type c)
 {
     // Make sure there is a reserve area.
     if (!_unbuffered && _buf_base == NULL && !allocate()) {
         return traits_type::eof();
     }
     // Sync before new buffer created below.
     if (traits_type::eq_int_type(sync(), traits_type::eof())) {
         return traits_type::eof();
     }
     if (!_unbuffered) {
         setp(_buf_base, _buf_end);
     }
     if (!traits_type::eq_int_type(c, traits_type::eof())) {
         // Extract the byte to be written.
         // (Required on big-endian architectures.)
         char_type byte = traits_type::to_char_type(c);
         if (!_unbuffered && pptr() < epptr()) {  // Guard against recursion.
             return sputc(byte);
         } else {
             if (PR_Write(_fd, &byte, 1) != 1) {
                 return traits_type::eof();
             }
         }
     }
     return traits_type::not_eof(c);
 }
 bool PRfilebuf::allocate()
 {
     char_type *buf = new(nothrow) char_type[BUFSIZ];
     if (buf == NULL) {
         return false;
     }
     setb(buf, buf + BUFSIZ, true);
     return true;
 }
 void PRfilebuf::setb(char_type *buf_base, char_type *buf_end, bool user_buf)
 {
     if (_buf_base && !_user_buf) {
         delete[] _buf_base;
     }
     _buf_base = buf_base;
     _buf_end = buf_end;
     _user_buf = user_buf;
 }
 PRifstream::PRifstream():
     istream(NULL),
     _filebuf()
 {
     init(&_filebuf);
 }
 PRifstream::PRifstream(PRFileDesc *fd):
     istream(NULL),
     _filebuf(fd)
 {
     init(&_filebuf);
 }
 PRifstream::PRifstream(PRFileDesc *fd, char_type *ptr, streamsize len):
     istream(NULL),
     _filebuf(fd, ptr, len)
 {
     init(&_filebuf);
 }
 PRifstream::PRifstream(const char *name, openmode flags, PRIntn mode):
     istream(NULL),
     _filebuf()
 {
     init(&_filebuf);
     if (!_filebuf.open(name, flags | in, mode)) {
         setstate(failbit);
     }
 }
 PRifstream::~PRifstream() { }
 void PRifstream::open(const char *name, openmode flags, PRIntn mode)
 {
     if (is_open() || !_filebuf.open(name, flags | in, mode)) {
         setstate(failbit);
     }
 }
 void PRifstream::attach(PRFileDesc *fd)
 {
     if (!_filebuf.attach(fd)) {
         setstate(failbit);
     }
 }
 void PRifstream::close()
 {
     if (_filebuf.close() == NULL) {
         setstate(failbit);
     }
 }
 PRofstream::PRofstream():
     ostream(NULL),
     _filebuf()
 {
     init(&_filebuf);
 }
 PRofstream::PRofstream(PRFileDesc *fd):
     ostream(NULL),
     _filebuf(fd)
 {
     init(&_filebuf);
 }
 PRofstream::PRofstream(PRFileDesc *fd, char_type *ptr, streamsize len):
     ostream(NULL),
     _filebuf(fd, ptr, len)
 {
     init(&_filebuf);
 }
 PRofstream::PRofstream(const char *name, openmode flags, PRIntn mode):
     ostream(NULL),
     _filebuf()
 {
     init(&_filebuf);
     if (!_filebuf.open(name, flags | out, mode)) {
         setstate(failbit);
     }
 }
 PRofstream::~PRofstream() { }
 void PRofstream::open(const char *name, openmode flags, PRIntn mode)
 {
     if (is_open() || !_filebuf.open(name, flags | out, mode)) {
         setstate(failbit);
     }
 }
 void PRofstream::attach(PRFileDesc *fd)
 {
     if (!_filebuf.attach(fd)) {
         setstate(failbit);
     }
 }
 void PRofstream::close()
 {
     if (_filebuf.close() == NULL) {
         setstate(failbit);
     }
 }
 PRfstream::PRfstream():
     iostream(NULL),
     _filebuf()
 {
     init(&_filebuf);
 }
 PRfstream::PRfstream(PRFileDesc *fd):
     iostream(NULL),
     _filebuf(fd)
 {
     init(&_filebuf);
 }
 PRfstream::PRfstream(PRFileDesc *fd, char_type *ptr, streamsize len):
     iostream(NULL),
     _filebuf(fd, ptr, len)
 {
     init(&_filebuf);
 }
 PRfstream::PRfstream(const char *name, openmode flags, PRIntn mode):
     iostream(NULL),
     _filebuf()
 {
     init(&_filebuf);
     if (!_filebuf.open(name, flags | in | out, mode)) {
         setstate(failbit);
     }
 }
 PRfstream::~PRfstream() { }
 void PRfstream::open(const char *name, openmode flags, PRIntn mode)
 {
     if (is_open() || !_filebuf.open(name, flags | in | out, mode)) {
         setstate(failbit);
     }
 }
 void PRfstream::attach(PRFileDesc *fd)
 {
     if (!_filebuf.attach(fd)) {
         setstate(failbit);
     }
 }
 void PRfstream::close()
 {
     if (_filebuf.close() == NULL) {
         setstate(failbit);
     }
 }

The Tor Browser / annotate

nsprpub/lib/prstreams/prstrms.cpp@6474c204b198 (annotated)

nsprpub/lib/prstreams/prstrms.cpp