/////////////////////////////////////////////////////////////////////////////
-// Name: stream.cpp
+// Name: src/common/stream.cpp
// Purpose: wxStream base classes
// Author: Guilhem Lavaux
-// Modified by:
+// Modified by: VZ (23.11.00) to fix realloc()ing new[]ed memory,
+// general code review
// Created: 11/07/98
// RCS-ID: $Id$
// Copyright: (c) Guilhem Lavaux
// Licence: wxWindows license
/////////////////////////////////////////////////////////////////////////////
+// ============================================================================
+// declarations
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
+
#ifdef __GNUG__
-#pragma implementation "stream.h"
+ #pragma implementation "stream.h"
#endif
// For compilers that support precompilation, includes "wx.h".
#include "wx/datstrm.h"
#include "wx/objstrm.h"
+// ----------------------------------------------------------------------------
+// constants
+// ----------------------------------------------------------------------------
+
+// the temporary buffer size used when copying from stream to stream
#define BUF_TEMP_SIZE 10000
+// ============================================================================
+// implementation
+// ============================================================================
+
// ----------------------------------------------------------------------------
// wxStreamBuffer
// ----------------------------------------------------------------------------
-#define CHECK_ERROR(err) \
- if (m_stream->m_lasterror == wxStream_NOERROR) \
- m_stream->m_lasterror = err
+void wxStreamBuffer::SetError(wxStreamError err)
+{
+ if ( m_stream->m_lasterror == wxStream_NOERROR )
+ m_stream->m_lasterror = err;
+}
+
+void wxStreamBuffer::InitBuffer()
+{
+ m_buffer_start =
+ m_buffer_end =
+ m_buffer_pos = NULL;
+ m_buffer_size = 0;
+
+ // there is nothing to destroy anyhow
+ m_destroybuf = FALSE;
+}
+
+void wxStreamBuffer::Init()
+{
+ InitBuffer();
+
+ m_fixed = TRUE;
+}
wxStreamBuffer::wxStreamBuffer(wxStreamBase& stream, BufMode mode)
- : m_buffer_start(NULL), m_buffer_end(NULL), m_buffer_pos(NULL),
- m_buffer_size(0), m_fixed(TRUE), m_flushable(TRUE), m_stream(&stream),
- m_mode(mode), m_destroybuf(FALSE), m_destroystream(FALSE)
{
+ Init();
+
+ m_stream = &stream;
+ m_mode = mode;
+
+ m_flushable = TRUE;
+ m_destroystream = FALSE;
}
wxStreamBuffer::wxStreamBuffer(BufMode mode)
- : m_buffer_start(NULL), m_buffer_end(NULL), m_buffer_pos(NULL),
- m_buffer_size(0), m_fixed(TRUE), m_flushable(FALSE), m_stream(NULL),
- m_mode(mode), m_destroybuf(FALSE), m_destroystream(TRUE)
{
- m_stream = new wxStreamBase();
+ Init();
+
+ m_stream = new wxStreamBase;
+ m_mode = mode;
+
+ m_flushable = FALSE;
+ m_destroystream = TRUE;
}
wxStreamBuffer::wxStreamBuffer(const wxStreamBuffer& buffer)
{
- m_buffer_start = buffer.m_buffer_start;
- m_buffer_end = buffer.m_buffer_end;
- m_buffer_pos = buffer.m_buffer_pos;
- m_buffer_size = buffer.m_buffer_size;
- m_fixed = buffer.m_fixed;
- m_flushable = buffer.m_flushable;
- m_stream = buffer.m_stream;
- m_mode = buffer.m_mode;
- m_destroybuf = FALSE;
- m_destroystream = FALSE;
+ // doing this has big chances to lead to a crashwhen the source buffer is
+ // destroyed (otherwise assume the caller knows what he does)
+ wxASSERT_MSG( !buffer.m_destroybuf && !buffer.m_destroystream,
+ _T("it's a bad idea to copy this buffer") );
+
+ m_buffer_start = buffer.m_buffer_start;
+ m_buffer_end = buffer.m_buffer_end;
+ m_buffer_pos = buffer.m_buffer_pos;
+ m_buffer_size = buffer.m_buffer_size;
+ m_fixed = buffer.m_fixed;
+ m_flushable = buffer.m_flushable;
+ m_stream = buffer.m_stream;
+ m_mode = buffer.m_mode;
+ m_destroybuf = FALSE;
+ m_destroystream = FALSE;
+}
+
+void wxStreamBuffer::FreeBuffer()
+{
+ if ( m_destroybuf )
+ free(m_buffer_start);
}
wxStreamBuffer::~wxStreamBuffer()
{
- if (m_destroybuf)
- wxDELETEA(m_buffer_start);
- if (m_destroystream)
- delete m_stream;
+ FreeBuffer();
+
+ if ( m_destroystream )
+ delete m_stream;
}
-void wxStreamBuffer::SetBufferIO(char *buffer_start, char *buffer_end)
+wxInputStream *wxStreamBuffer::GetInputStream() const
{
- if (m_destroybuf)
- wxDELETEA(m_buffer_start);
- m_buffer_start = buffer_start;
- m_buffer_end = buffer_end;
+ return m_mode == write ? NULL : (wxInputStream *)m_stream;
+}
- m_buffer_size = m_buffer_end-m_buffer_start;
- m_destroybuf = FALSE;
- ResetBuffer();
+wxOutputStream *wxStreamBuffer::GetOutputStream() const
+{
+ return m_mode == read ? NULL : (wxOutputStream *)m_stream;
}
-void wxStreamBuffer::SetBufferIO(size_t bufsize)
+void wxStreamBuffer::SetBufferIO(void *buffer_start,
+ void *buffer_end,
+ bool takeOwnership)
{
- char *b_start;
+ SetBufferIO(buffer_start, (char *)buffer_end - (char *)buffer_start,
+ takeOwnership);
+}
- if (m_destroybuf)
- wxDELETEA(m_buffer_start);
+void wxStreamBuffer::SetBufferIO(void *start,
+ size_t len,
+ bool takeOwnership)
+{
+ // start by freeing the old buffer
+ FreeBuffer();
- if (!bufsize) {
- m_buffer_start = NULL;
- m_buffer_end = NULL;
- m_buffer_pos = NULL;
- m_buffer_size = 0;
- return;
- }
+ m_buffer_start = (char *)start;
+ m_buffer_end = m_buffer_start + len;
+
+ m_buffer_size = len;
+
+ // if we own it, we free it
+ m_destroybuf = takeOwnership;
+
+ ResetBuffer();
+}
- b_start = new char[bufsize];
- SetBufferIO(b_start, b_start + bufsize);
- m_destroybuf = TRUE;
+void wxStreamBuffer::SetBufferIO(size_t bufsize)
+{
+ // start by freeing the old buffer
+ FreeBuffer();
+
+ if ( bufsize )
+ {
+ SetBufferIO(malloc(bufsize), bufsize, TRUE /* take ownership */);
+ }
+ else // no buffer size => no buffer
+ {
+ InitBuffer();
+ }
}
void wxStreamBuffer::ResetBuffer()
{
- m_stream->m_lasterror = wxStream_NOERROR;
- m_stream->m_lastcount = 0;
- if (m_mode == read && m_flushable)
- m_buffer_pos = m_buffer_end;
- else
- m_buffer_pos = m_buffer_start;
+ wxCHECK_RET( m_stream, _T("should have a stream in wxStreamBuffer") );
+
+ m_stream->m_lasterror = wxStream_NOERROR;
+ m_stream->m_lastcount = 0;
+ if (m_mode == read && m_flushable)
+ m_buffer_pos = m_buffer_end;
+ else
+ m_buffer_pos = m_buffer_start;
}
+// fill the buffer with as much data as possible (only for read buffers)
bool wxStreamBuffer::FillBuffer()
{
- size_t count;
+ wxInputStream *inStream = GetInputStream();
- count = m_stream->OnSysRead(m_buffer_start, m_buffer_size);
- m_buffer_end = m_buffer_start+count;
- m_buffer_pos = m_buffer_start;
+ wxCHECK_MSG( inStream, FALSE, _T("should have a stream in wxStreamBuffer") );
- if (count == 0)
- return FALSE;
- return TRUE;
+ size_t count = inStream->OnSysRead(m_buffer_start, m_buffer_size);
+ if ( !count )
+ return FALSE;
+
+ m_buffer_end = m_buffer_start + count;
+ m_buffer_pos = m_buffer_start;
+
+ return TRUE;
}
+// write the buffer contents to the stream (only for write buffers)
bool wxStreamBuffer::FlushBuffer()
{
- size_t count, current;
+ wxCHECK_MSG( m_flushable, FALSE, _T("can't flush this buffer") );
- if (m_buffer_pos == m_buffer_start || !m_flushable)
- return FALSE;
+ // FIXME: what is this check for? (VZ)
+ if ( m_buffer_pos == m_buffer_start )
+ return FALSE;
- current = m_buffer_pos-m_buffer_start;
- count = m_stream->OnSysWrite(m_buffer_start, current);
- if (count != current)
- return FALSE;
- m_buffer_pos = m_buffer_start;
+ wxOutputStream *outStream = GetOutputStream();
+
+ wxCHECK_MSG( outStream, FALSE, _T("should have a stream in wxStreamBuffer") );
+
+ size_t current = m_buffer_pos - m_buffer_start;
+ size_t count = outStream->OnSysWrite(m_buffer_start, current);
+ if ( count != current )
+ return FALSE;
- return TRUE;
+ m_buffer_pos = m_buffer_start;
+
+ return TRUE;
}
+size_t wxStreamBuffer::GetDataLeft()
+{
+ /* Why is this done? RR. */
+ if ( m_buffer_pos == m_buffer_end && m_flushable)
+ FillBuffer();
+
+ return GetBytesLeft();
+}
+
+// copy up to size bytes from our buffer into the provided one
void wxStreamBuffer::GetFromBuffer(void *buffer, size_t size)
{
- size_t s_toget = m_buffer_end-m_buffer_pos;
+ // don't get more bytes than left in the buffer
+ size_t left = GetBytesLeft();
- if (size < s_toget)
- s_toget = size;
+ if ( size > left )
+ size = left;
- memcpy(buffer, m_buffer_pos, s_toget);
- m_buffer_pos += s_toget;
+ memcpy(buffer, m_buffer_pos, size);
+ m_buffer_pos += size;
}
+// copy the contents of the provided buffer into this one
void wxStreamBuffer::PutToBuffer(const void *buffer, size_t size)
{
- size_t s_toput = m_buffer_end-m_buffer_pos;
-
- if (s_toput < size && !m_fixed) {
- if (!m_buffer_start)
- SetBufferIO(size);
- else {
- size_t delta = m_buffer_pos-m_buffer_start;
-
- m_buffer_start = (char *)realloc(m_buffer_start, m_buffer_size+size);
- m_buffer_pos = m_buffer_start + delta;
- // I round a bit
- m_buffer_size += size;
- m_buffer_end = m_buffer_start+m_buffer_size;
+ size_t left = GetBytesLeft();
+ if ( size > left )
+ {
+ if ( m_fixed )
+ {
+ // we can't realloc the buffer, so just copy what we can
+ size = left;
+ }
+ else // !m_fixed
+ {
+ // realloc the buffer to have enough space for the data
+ size_t delta = m_buffer_pos - m_buffer_start;
+
+ char *startOld = m_buffer_start;
+ m_buffer_size += size;
+ m_buffer_start = (char *)realloc(m_buffer_start, m_buffer_size);
+ if ( !m_buffer_start )
+ {
+ // don't leak memory if realloc() failed
+ m_buffer_start = startOld;
+ m_buffer_size -= size;
+
+ // what else can we do?
+ return;
+ }
+
+ // adjust the pointers invalidated by realloc()
+ m_buffer_pos = m_buffer_start + delta;
+ m_buffer_end = m_buffer_start + m_buffer_size;
+ }
}
- s_toput = size;
- }
- if (s_toput > size)
- s_toput = size;
- memcpy(m_buffer_pos, buffer, s_toput);
- m_buffer_pos += s_toput;
+
+ memcpy(m_buffer_pos, buffer, size);
+ m_buffer_pos += size;
}
void wxStreamBuffer::PutChar(char c)
{
- wxASSERT(m_stream != NULL);
-
- if (!m_buffer_size) {
- m_stream->OnSysWrite(&c, 1);
- return;
- }
+ wxOutputStream *outStream = GetOutputStream();
- if (GetDataLeft() == 0 && !FlushBuffer()) {
- CHECK_ERROR(wxStream_WRITE_ERR);
- return;
- }
+ wxCHECK_RET( outStream, _T("should have a stream in wxStreamBuffer") );
- PutToBuffer(&c, 1);
- m_stream->m_lastcount = 1;
+ // if we don't have buffer at all, just forward this call to the stream,
+ if ( !HasBuffer() )
+ {
+ outStream->OnSysWrite(&c, 1);
+ }
+ else
+ {
+ // otherwise check we have enough space left
+ if ( !GetDataLeft() && !FlushBuffer() )
+ {
+ // we don't
+ SetError(wxStream_WRITE_ERR);
+ }
+ else
+ {
+ PutToBuffer(&c, 1);
+ m_stream->m_lastcount = 1;
+ }
+ }
}
char wxStreamBuffer::Peek()
{
- char c;
+ wxCHECK_MSG( m_stream && HasBuffer(), 0,
+ _T("should have the stream and the buffer in wxStreamBuffer") );
- wxASSERT(m_stream != NULL && m_buffer_size != 0);
-
- if (!GetDataLeft()) {
- CHECK_ERROR(wxStream_READ_ERR);
- return 0;
- }
+ if ( !GetDataLeft() )
+ {
+ SetError(wxStream_READ_ERR);
+ return 0;
+ }
- GetFromBuffer(&c, 1);
- m_buffer_pos--;
+ char c;
+ GetFromBuffer(&c, 1);
+ m_buffer_pos--;
- return c;
+ return c;
}
char wxStreamBuffer::GetChar()
{
- char c;
-
- wxASSERT(m_stream != NULL);
+ wxInputStream *inStream = GetInputStream();
- if (!m_buffer_size) {
- m_stream->OnSysRead(&c, 1);
- return c;
- }
+ wxCHECK_MSG( inStream, 0, _T("should have a stream in wxStreamBuffer") );
- if (!GetDataLeft()) {
- CHECK_ERROR(wxStream_READ_ERR);
- return 0;
- }
+ char c;
+ if ( !HasBuffer() )
+ {
+ inStream->OnSysRead(&c, 1);
+ }
+ else
+ {
+ if ( !GetDataLeft() )
+ {
+ SetError(wxStream_READ_ERR);
+ c = 0;
+ }
+ else
+ {
+ GetFromBuffer(&c, 1);
+ m_stream->m_lastcount = 1;
+ }
+ }
- GetFromBuffer(&c, 1);
-
- m_stream->m_lastcount = 1;
- return c;
+ return c;
}
size_t wxStreamBuffer::Read(void *buffer, size_t size)
{
- wxASSERT(m_stream != NULL);
+ wxInputStream *inStream = GetInputStream();
- if (m_mode == write)
- return 0;
+ wxCHECK_MSG( inStream, 0, _T("should have a stream in wxStreamBuffer") );
- // ------------------
- // Buffering disabled
- // ------------------
-
- m_stream->m_lasterror = wxStream_NOERROR;
- if (!m_buffer_size)
- return (m_stream->m_lastcount += m_stream->OnSysRead(buffer, size));
-
- // -----------------
- // Buffering enabled
- // -----------------
- size_t buf_left, orig_size = size;
-
- while (size > 0) {
- buf_left = GetDataLeft();
-
- // First case: the requested buffer is larger than the stream buffer,
- // we split it.
- if (size > buf_left) {
- GetFromBuffer(buffer, buf_left);
- size -= buf_left;
- buffer = (char *)buffer + buf_left; // ANSI C++ violation.
-
- if (!FillBuffer()) {
- CHECK_ERROR(wxStream_EOF);
- return (m_stream->m_lastcount = orig_size-size);
- }
- } else {
-
- // Second case: we just copy from the stream buffer.
- GetFromBuffer(buffer, size);
- break;
+ // lasterror is reset before all new IO calls
+ m_stream->m_lasterror = wxStream_NOERROR;
+
+ if ( !HasBuffer() )
+ {
+ m_stream->m_lastcount = inStream->OnSysRead(buffer, size);
+ }
+ else // we have a buffer, use it
+ {
+ size_t orig_size = size;
+
+ while ( size > 0 )
+ {
+ size_t left = GetDataLeft();
+
+ // if the requested number of bytes if greater than the buffer
+ // size, read data in chunks
+ if ( size > left )
+ {
+ GetFromBuffer(buffer, left);
+ size -= left;
+ buffer = (char *)buffer + left;
+
+ if ( !FillBuffer() )
+ {
+ SetError(wxStream_EOF);
+ break;
+ }
+ }
+ else // otherwise just do it in one gulp
+ {
+ GetFromBuffer(buffer, size);
+ size = 0;
+ }
+ }
+
+ m_stream->m_lastcount = orig_size - size;
}
- }
- return (m_stream->m_lastcount += orig_size);
+
+ return m_stream->m_lastcount;
}
-size_t wxStreamBuffer::Read(wxStreamBuffer *s_buf)
+// this should really be called "Copy()"
+size_t wxStreamBuffer::Read(wxStreamBuffer *dbuf)
{
- char buf[BUF_TEMP_SIZE];
- size_t s = 0, bytes_read = BUF_TEMP_SIZE;
+ wxCHECK_MSG( m_mode != write, 0, _T("can't read from this buffer") );
- if (m_mode == write)
- return 0;
+ char buf[BUF_TEMP_SIZE];
+ size_t nRead,
+ total = 0;
- while (bytes_read != 0) {
- bytes_read = Read(buf, bytes_read);
- bytes_read = s_buf->Write(buf, bytes_read);
- s += bytes_read;
- }
- return s;
+ do
+ {
+ nRead = Read(dbuf, WXSIZEOF(buf));
+ if ( nRead )
+ {
+ nRead = dbuf->Write(buf, nRead);
+ total += nRead;
+ }
+ }
+ while ( nRead );
+
+ return total;
}
size_t wxStreamBuffer::Write(const void *buffer, size_t size)
{
- wxASSERT(m_stream != NULL);
-
- if (m_mode == read)
- return 0;
-
- // ------------------
- // Buffering disabled
- // ------------------
-
- m_stream->m_lasterror = wxStream_NOERROR;
- if (!m_buffer_size && m_fixed)
- return (m_stream->m_lastcount = m_stream->OnSysWrite(buffer, size));
-
- // ------------------
- // Buffering enabled
- // ------------------
+ wxOutputStream *outStream = GetOutputStream();
- size_t buf_left, orig_size = size;
+ wxCHECK_MSG( outStream, 0, _T("should have a stream in wxStreamBuffer") );
- while (size > 0) {
- buf_left = m_buffer_end - m_buffer_pos;
+ // lasterror is reset before all new IO calls
+ m_stream->m_lasterror = wxStream_NOERROR;
- // First case: the buffer to write is larger than the stream buffer,
- // we split it
- // NB: If stream buffer isn't fixed (as for wxMemoryOutputStream),
- // we always go to the second case.
- if (size > buf_left && m_fixed) {
- PutToBuffer(buffer, buf_left);
- size -= buf_left;
- buffer = (char *)buffer + buf_left; // ANSI C++ violation.
-
- if (!FlushBuffer()) {
- CHECK_ERROR(wxStream_WRITE_ERR);
- return (m_stream->m_lastcount = orig_size-size);
- }
-
- m_buffer_pos = m_buffer_start;
-
- } else {
-
- // Second case: just copy it in the stream buffer.
- PutToBuffer(buffer, size);
- break;
+ if ( !HasBuffer() && m_fixed )
+ {
+ // no buffer, just forward the call to the stream
+ m_stream->m_lastcount = outStream->OnSysWrite(buffer, size);
+ }
+ else // we [may] have a buffer, use it
+ {
+ size_t orig_size = size;
+
+ while ( size > 0 )
+ {
+ size_t left = GetBytesLeft();
+
+ // if the buffer is too large to fit in the stream buffer, split
+ // it in smaller parts
+ //
+ // NB: If stream buffer isn't fixed (as for wxMemoryOutputStream),
+ // we always go to the second case.
+ //
+ // FIXME: fine, but if it fails we should (re)try writing it by
+ // chunks as this will (hopefully) always work (VZ)
+ if ( size > left && m_fixed )
+ {
+ PutToBuffer(buffer, left);
+ size -= left;
+ buffer = (char *)buffer + left;
+
+ if ( !FlushBuffer() )
+ {
+ SetError(wxStream_WRITE_ERR);
+
+ break;
+ }
+
+ m_buffer_pos = m_buffer_start;
+ }
+ else // we can do it in one gulp
+ {
+ PutToBuffer(buffer, size);
+ size = 0;
+ }
+ }
+
+ m_stream->m_lastcount = orig_size - size;
}
- }
- return (m_stream->m_lastcount = orig_size);
+
+ return m_stream->m_lastcount;
}
size_t wxStreamBuffer::Write(wxStreamBuffer *sbuf)
{
- char buf[BUF_TEMP_SIZE];
- size_t s = 0, bytes_count = BUF_TEMP_SIZE, b_count2;
- wxInputStream *in_stream;
-
- if (m_mode == read)
- return 0;
-
- in_stream = (wxInputStream *)sbuf->Stream();
+ wxCHECK_MSG( m_mode != read, 0, _T("can't write to this buffer") );
+ wxCHECK_MSG( sbuf->m_mode != write, 0, _T("can't read from that buffer") );
+
+ char buf[BUF_TEMP_SIZE];
+ size_t nWrite,
+ total = 0;
+
+ do
+ {
+ size_t nRead = sbuf->Read(buf, WXSIZEOF(buf));
+ if ( nRead )
+ {
+ nWrite = Write(buf, nRead);
+ if ( nWrite < nRead )
+ {
+ // put back data we couldn't copy
+ wxInputStream *in_stream = (wxInputStream *)sbuf->GetStream();
+
+ in_stream->Ungetch(buf + nWrite, nRead - nWrite);
+ }
+
+ total += nWrite;
+ }
+ else
+ {
+ nWrite = 0;
+ }
+ }
+ while ( nWrite == WXSIZEOF(buf) );
- while (bytes_count == BUF_TEMP_SIZE) {
- b_count2 = sbuf->Read(buf, bytes_count);
- bytes_count = Write(buf, b_count2);
- if (b_count2 > bytes_count)
- in_stream->Ungetch(buf+bytes_count, b_count2-bytes_count);
- s += bytes_count;
- }
- return s;
+ return total;
}
off_t wxStreamBuffer::Seek(off_t pos, wxSeekMode mode)
{
- off_t ret_off, diff, last_access;
+ off_t ret_off, diff;
- last_access = GetLastAccess();
+ off_t last_access = GetLastAccess();
- if (!m_flushable) {
- diff = pos + GetIntPosition();
- if (diff < 0 || diff > last_access)
- return wxInvalidOffset;
- SetIntPosition(diff);
- return diff;
- }
+ if ( !m_flushable )
+ {
+ switch (mode)
+ {
+ case wxFromStart:
+ diff = pos;
+ break;
- switch (mode) {
- case wxFromStart: {
- // We'll try to compute an internal position later ...
- ret_off = m_stream->OnSysSeek(pos, wxFromStart);
- ResetBuffer();
- return ret_off;
- }
- case wxFromCurrent: {
- diff = pos + GetIntPosition();
-
- if ( (diff > last_access) || (diff < 0) ) {
- // We must take into account the fact that we have read something
- // previously.
- ret_off = m_stream->OnSysSeek(diff-last_access, wxFromCurrent);
- ResetBuffer();
- return ret_off;
- } else {
- SetIntPosition(diff);
- return pos;
+ case wxFromCurrent:
+ diff = pos + GetIntPosition();
+ break;
+
+ case wxFromEnd:
+ diff = pos + last_access;
+ break;
+
+ default:
+ wxFAIL_MSG( _T("invalid seek mode") );
+
+ return wxInvalidOffset;
+ }
+ if (diff < 0 || diff > last_access)
+ return wxInvalidOffset;
+ SetIntPosition(diff);
+ return diff;
}
- }
- case wxFromEnd:
- // Hard to compute: always seek to the requested position.
- ret_off = m_stream->OnSysSeek(pos, wxFromEnd);
- ResetBuffer();
- return ret_off;
- }
- return wxInvalidOffset;
+
+ switch ( mode )
+ {
+ case wxFromStart:
+ // We'll try to compute an internal position later ...
+ ret_off = m_stream->OnSysSeek(pos, wxFromStart);
+ ResetBuffer();
+ return ret_off;
+
+ case wxFromCurrent:
+ diff = pos + GetIntPosition();
+
+ if ( (diff > last_access) || (diff < 0) )
+ {
+ // We must take into account the fact that we have read
+ // something previously.
+ ret_off = m_stream->OnSysSeek(diff-last_access, wxFromCurrent);
+ ResetBuffer();
+ return ret_off;
+ }
+ else
+ {
+ SetIntPosition(diff);
+ return pos;
+ }
+
+ case wxFromEnd:
+ // Hard to compute: always seek to the requested position.
+ ret_off = m_stream->OnSysSeek(pos, wxFromEnd);
+ ResetBuffer();
+ return ret_off;
+ }
+
+ return wxInvalidOffset;
}
off_t wxStreamBuffer::Tell() const
{
- off_t pos;
+ off_t pos = m_stream->OnSysTell();
+ if ( pos == wxInvalidOffset )
+ return wxInvalidOffset;
- if (m_flushable) {
- pos = m_stream->OnSysTell();
- if (pos == wxInvalidOffset)
- return wxInvalidOffset;
- return pos - GetLastAccess() + GetIntPosition();
- } else
- return GetIntPosition();
-}
+ pos += GetIntPosition();
-size_t wxStreamBuffer::GetDataLeft()
-{
- if (m_buffer_end == m_buffer_pos && m_flushable)
- FillBuffer();
- return m_buffer_end-m_buffer_pos;
+ if ( m_mode == read && m_flushable )
+ pos -= GetLastAccess();
+
+ return pos;
}
// ----------------------------------------------------------------------------
wxStreamBase::wxStreamBase()
{
- m_lasterror = wxStream_NOERROR;
- m_lastcount = 0;
+ m_lasterror = wxStream_NOERROR;
+ m_lastcount = 0;
}
wxStreamBase::~wxStreamBase()
{
}
-size_t wxStreamBase::OnSysRead(void *WXUNUSED(buffer), size_t WXUNUSED(size))
-{
- return 0;
-}
-
-size_t wxStreamBase::OnSysWrite(const void *WXUNUSED(buffer), size_t WXUNUSED(bufsize))
-{
- return 0;
-}
-
off_t wxStreamBase::OnSysSeek(off_t WXUNUSED(seek), wxSeekMode WXUNUSED(mode))
{
- return wxInvalidOffset;
+ return wxInvalidOffset;
}
off_t wxStreamBase::OnSysTell() const
{
- return wxInvalidOffset;
+ return wxInvalidOffset;
}
// ----------------------------------------------------------------------------
// ----------------------------------------------------------------------------
wxInputStream::wxInputStream()
- : wxStreamBase(),
- m_wback(NULL), m_wbacksize(0), m_wbackcur(0)
{
+ m_wback = NULL;
+ m_wbacksize =
+ m_wbackcur = 0;
}
wxInputStream::~wxInputStream()
{
- if (m_wback)
free(m_wback);
}
-char *wxInputStream::AllocSpaceWBack(size_t needed_size)
+size_t wxInputStream::OnSysRead(void * WXUNUSED(buffer),
+ size_t WXUNUSED(bufsize))
{
- char *temp_b;
- size_t old_size;
+ return 0;
+}
+
+bool wxInputStream::Eof() const
+{
+ wxInputStream *self = wxConstCast(this, wxInputStream);
- old_size = m_wbacksize;
- m_wbacksize += needed_size;
+ char c;
+ self->Read(&c, 1);
- if (!m_wback)
- temp_b = (char *)malloc(m_wbacksize);
- else
- temp_b = (char *)realloc(m_wback, m_wbacksize);
+ // some streams can know that they're at EOF before actually trying to
+ // read beyond the end of stream (e.g. files) while others have no way of
+ // knowing it, so to provide the same behaviour in all cases we only
+ // return TRUE from here if the character really couldn't be read
+ if ( !self->LastRead() && GetLastError() == wxSTREAM_EOF )
+ {
+ return TRUE;
+ }
- if (!temp_b)
- return NULL;
- m_wback = temp_b;
+ self->Ungetch(c);
- memmove(m_wback+needed_size, m_wback, old_size);
-
- return (char *)(m_wback);
+ return FALSE;
}
-size_t wxInputStream::GetWBack(char *buf, size_t bsize)
+char *wxInputStream::AllocSpaceWBack(size_t needed_size)
{
- size_t s_toget = m_wbacksize-m_wbackcur;
+ // get number of bytes left from previous wback buffer
+ size_t toget = m_wbacksize - m_wbackcur;
- if (!m_wback)
- return 0;
+ // allocate a buffer large enough to hold prev + new data
+ char *temp_b = (char *)malloc(needed_size + toget);
- if (bsize < s_toget)
- s_toget = bsize;
+ if (!temp_b)
+ return NULL;
- memcpy(buf, (m_wback+m_wbackcur), s_toget);
+ /* copy previous data (and free old buffer) if needed */
+ if (m_wback)
+ {
+ memmove(temp_b + needed_size, m_wback + m_wbackcur, toget);
+ free(m_wback);
+ }
- m_wbackcur += s_toget;
- if (m_wbackcur == m_wbacksize) {
- free(m_wback);
- m_wback = (char *)NULL;
- m_wbacksize = 0;
+ /* done */
+ m_wback = temp_b;
m_wbackcur = 0;
- }
-
- return s_toget;
+ m_wbacksize = needed_size + toget;
+
+ return m_wback;
}
-size_t wxInputStream::Ungetch(const void *buf, size_t bufsize)
+size_t wxInputStream::GetWBack(void *buf, size_t bsize)
{
- char *ptrback;
+ size_t toget = m_wbacksize-m_wbackcur;
- ptrback = AllocSpaceWBack(bufsize);
- if (!ptrback)
- return 0;
+ if (!m_wback)
+ return 0;
+
+ if (bsize < toget)
+ toget = bsize;
- memcpy(ptrback, buf, bufsize);
- return bufsize;
+ memcpy(buf, (m_wback+m_wbackcur), toget);
+
+ m_wbackcur += toget;
+ if (m_wbackcur == m_wbacksize)
+ {
+ free(m_wback);
+ m_wback = NULL;
+ m_wbacksize = 0;
+ m_wbackcur = 0;
+ }
+
+ return toget;
}
-bool wxInputStream::Ungetch(char c)
+size_t wxInputStream::Ungetch(const void *buf, size_t bufsize)
{
- char *ptrback;
+ char *ptrback = AllocSpaceWBack(bufsize);
+ if (!ptrback)
+ return 0;
- ptrback = AllocSpaceWBack(1);
- if (!ptrback)
- return FALSE;
+ memcpy(ptrback, buf, bufsize);
+ return bufsize;
+}
+
+bool wxInputStream::Ungetch(char c)
+{
+ void *ptrback = AllocSpaceWBack(1);
+ if (!ptrback)
+ return FALSE;
- *ptrback = c;
- return TRUE;
+ *(char *)ptrback = c;
+ return TRUE;
}
char wxInputStream::GetC()
{
- char c;
- Read(&c, 1);
- return c;
+ char c;
+ Read(&c, 1);
+ return c;
}
-wxInputStream& wxInputStream::Read(void *buffer, size_t size)
+wxInputStream& wxInputStream::Read(void *buf, size_t size)
{
- size_t retsize;
- char *buf = (char *)buffer;
+ size_t retsize = GetWBack(buf, size);
+ if (retsize == size)
+ {
+ m_lastcount = size;
+ m_lasterror = wxStream_NOERROR;
+ return *this;
+ }
+ size -= retsize;
+ buf = (char *)buf + retsize;
- retsize = GetWBack(buf, size);
- if (retsize == size) {
- m_lastcount = size;
- m_lasterror = wxStream_NOERROR;
+ m_lastcount = OnSysRead(buf, size) + retsize;
return *this;
- }
- size -= retsize;
- buf += retsize;
-
- m_lastcount = OnSysRead(buf, size);
- return *this;
}
char wxInputStream::Peek()
{
- char c;
+ char c;
+ Read(&c, 1);
+ if (m_lasterror == wxStream_NOERROR)
+ {
+ Ungetch(c);
+ return c;
+ }
- Read(&c, 1);
- if (m_lasterror == wxStream_NOERROR) {
- Ungetch(c);
- return c;
- }
- return 0;
+ return 0;
}
wxInputStream& wxInputStream::Read(wxOutputStream& stream_out)
{
- char buf[BUF_TEMP_SIZE];
- size_t bytes_read = BUF_TEMP_SIZE;
+ char buf[BUF_TEMP_SIZE];
+ size_t bytes_read = BUF_TEMP_SIZE;
- while (bytes_read == BUF_TEMP_SIZE) {
- bytes_read = Read(buf, bytes_read).LastRead();
- bytes_read = stream_out.Write(buf, bytes_read).LastWrite();
- }
- return *this;
+ while (bytes_read == BUF_TEMP_SIZE)
+ {
+ bytes_read = Read(buf, bytes_read).LastRead();
+ bytes_read = stream_out.Write(buf, bytes_read).LastWrite();
+ }
+ return *this;
}
off_t wxInputStream::SeekI(off_t pos, wxSeekMode mode)
{
- //should be check and improve, just to remove a slight bug !
- // I don't know whether it should be put as well in wxFileInputStream::OnSysSeek ?
- if (m_lasterror==wxSTREAM_EOF) m_lasterror=wxSTREAM_NOERROR;
+ /* Should be check and improve, just to remove a slight bug !
+ I don't know whether it should be put as well in wxFileInputStream::OnSysSeek ? */
+ if (m_lasterror==wxSTREAM_EOF)
+ m_lasterror=wxSTREAM_NOERROR;
+
+ /* A call to SeekI() will automatically invalidate any previous call
+ to Ungetch(), otherwise it would be possible to SeekI() to one
+ one position, unread some bytes there, SeekI() to another position
+ and the data would be corrupted.
+
+ GRG: Could add code here to try to navigate within the wback
+ buffer if possible, but is it really needed? It would only work
+ when seeking in wxFromCurrent mode, else it would invalidate
+ anyway...
+ */
+ if (m_wback)
+ {
+ free(m_wback);
+ m_wback = NULL;
+ m_wbacksize = 0;
+ m_wbackcur = 0;
+ }
- return OnSysSeek(pos, mode);
+ return OnSysSeek(pos, mode);
}
off_t wxInputStream::TellI() const
{
- return OnSysTell();
+ /* GRG: Changed to make it compatible with the wback buffer */
+ off_t pos = OnSysTell();
+
+ if (pos != wxInvalidOffset)
+ pos -= (m_wbacksize - m_wbackcur);
+
+ return pos;
}
// --------------------
#if wxUSE_SERIAL
wxInputStream& wxInputStream::operator>>(wxObject *& obj)
{
- wxObjectInputStream obj_s(*this);
- obj = obj_s.LoadObject();
- return *this;
+ wxObjectInputStream obj_s(*this);
+ obj = obj_s.LoadObject();
+ return *this;
}
-#endif
+#endif // wxUSE_SERIAL
// ----------------------------------------------------------------------------
// wxOutputStream
// ----------------------------------------------------------------------------
+
wxOutputStream::wxOutputStream()
- : wxStreamBase()
{
}
{
}
+size_t wxOutputStream::OnSysWrite(const void * WXUNUSED(buffer),
+ size_t WXUNUSED(bufsize))
+{
+ return 0;
+}
+
+void wxOutputStream::PutC(char c)
+{
+ Write(&c, 1);
+}
+
wxOutputStream& wxOutputStream::Write(const void *buffer, size_t size)
{
- m_lastcount = OnSysWrite(buffer, size);
- return *this;
+ m_lastcount = OnSysWrite(buffer, size);
+ return *this;
}
wxOutputStream& wxOutputStream::Write(wxInputStream& stream_in)
{
- stream_in.Read(*this);
- return *this;
+ stream_in.Read(*this);
+ return *this;
}
off_t wxOutputStream::TellO() const
{
- return OnSysTell();
+ return OnSysTell();
}
off_t wxOutputStream::SeekO(off_t pos, wxSeekMode mode)
{
- return OnSysSeek(pos, mode);
+ return OnSysSeek(pos, mode);
}
void wxOutputStream::Sync()
#if wxUSE_SERIAL
wxOutputStream& wxOutputStream::operator<<(wxObject& obj)
{
- wxObjectOutputStream obj_s(*this);
- obj_s.SaveObject(obj);
- return *this;
+ wxObjectOutputStream obj_s(*this);
+ obj_s.SaveObject(obj);
+ return *this;
}
-#endif
+#endif // wxUSE_SERIAL
// ----------------------------------------------------------------------------
// wxCountingOutputStream
// ----------------------------------------------------------------------------
wxCountingOutputStream::wxCountingOutputStream ()
- : wxOutputStream()
{
- m_currentPos = 0;
+ m_currentPos = 0;
}
size_t wxCountingOutputStream::GetSize() const
{
- return m_lastcount;
+ return m_lastcount;
}
-size_t wxCountingOutputStream::OnSysWrite(const void *WXUNUSED(buffer), size_t size)
+size_t wxCountingOutputStream::OnSysWrite(const void *WXUNUSED(buffer),
+ size_t size)
{
- m_currentPos += size;
- if (m_currentPos > m_lastcount) m_lastcount = m_currentPos;
- return m_currentPos;
+ m_currentPos += size;
+ if (m_currentPos > m_lastcount)
+ m_lastcount = m_currentPos;
+
+ return m_currentPos;
}
off_t wxCountingOutputStream::OnSysSeek(off_t pos, wxSeekMode mode)
{
- if (mode == wxFromStart)
- {
- m_currentPos = pos;
- }
- if (mode == wxFromEnd)
- {
- m_currentPos = m_lastcount + pos;
- }
- else
- {
- m_currentPos += pos;
- }
- if (m_currentPos > m_lastcount) m_lastcount = m_currentPos;
-
- return m_currentPos; // ?
+ switch ( mode )
+ {
+ case wxFromStart:
+ m_currentPos = pos;
+ break;
+
+ case wxFromEnd:
+ m_currentPos = m_lastcount + pos;
+ break;
+
+ case wxFromCurrent:
+ m_currentPos += pos;
+ break;
+
+ default:
+ wxFAIL_MSG( _T("invalid seek mode") );
+ return wxInvalidOffset;
+ }
+
+ if (m_currentPos > m_lastcount)
+ m_lastcount = m_currentPos;
+
+ return m_currentPos;
}
off_t wxCountingOutputStream::OnSysTell() const
{
- return m_currentPos; // ?
+ return m_currentPos;
}
-
+
// ----------------------------------------------------------------------------
// wxFilterInputStream
// ----------------------------------------------------------------------------
wxFilterInputStream::wxFilterInputStream()
- : wxInputStream()
{
+ m_parent_i_stream = NULL;
}
wxFilterInputStream::wxFilterInputStream(wxInputStream& stream)
- : wxInputStream()
{
- m_parent_i_stream = &stream;
+ m_parent_i_stream = &stream;
}
wxFilterInputStream::~wxFilterInputStream()
// ----------------------------------------------------------------------------
// wxFilterOutputStream
// ----------------------------------------------------------------------------
+
wxFilterOutputStream::wxFilterOutputStream()
- : wxOutputStream()
{
+ m_parent_o_stream = NULL;
}
wxFilterOutputStream::wxFilterOutputStream(wxOutputStream& stream)
- : wxOutputStream()
{
- m_parent_o_stream = &stream;
+ m_parent_o_stream = &stream;
}
wxFilterOutputStream::~wxFilterOutputStream()
// ----------------------------------------------------------------------------
// wxBufferedInputStream
// ----------------------------------------------------------------------------
-wxBufferedInputStream::wxBufferedInputStream(wxInputStream& s)
- : wxFilterInputStream(s)
+
+wxBufferedInputStream::wxBufferedInputStream(wxInputStream& s,
+ wxStreamBuffer *buffer)
+ : wxFilterInputStream(s)
{
- m_i_streambuf = new wxStreamBuffer(*this, wxStreamBuffer::read);
- m_i_streambuf->SetBufferIO(1024);
+ if ( buffer )
+ {
+ // use the buffer provided by the user
+ m_i_streambuf = buffer;
+ }
+ else // create a default buffer
+ {
+ m_i_streambuf = new wxStreamBuffer(*this, wxStreamBuffer::read);
+
+ m_i_streambuf->SetBufferIO(1024);
+ }
}
wxBufferedInputStream::~wxBufferedInputStream()
{
- delete m_i_streambuf;
+ m_parent_i_stream->SeekI(-(off_t)m_i_streambuf->GetBytesLeft(),
+ wxFromCurrent);
+
+ delete m_i_streambuf;
}
char wxBufferedInputStream::Peek()
{
- return m_i_streambuf->Peek();
+ return m_i_streambuf->Peek();
}
-wxInputStream& wxBufferedInputStream::Read(void *buffer, size_t size)
+wxInputStream& wxBufferedInputStream::Read(void *buf, size_t size)
{
- size_t retsize;
- char *buf = (char *)buffer;
+ size_t retsize;
- retsize = GetWBack(buf, size);
- m_lastcount = retsize;
- if (retsize == size) {
- m_lasterror = wxStream_NOERROR;
- return *this;
- }
- size -= retsize;
- buf += retsize;
+ retsize = GetWBack(buf, size);
+ m_lastcount = retsize;
+ if ( retsize == size )
+ {
+ m_lasterror = wxStream_NOERROR;
+ return *this;
+ }
+ size -= retsize;
+ buf = (char *)buf + retsize;
- m_i_streambuf->Read(buf, size);
+ m_i_streambuf->Read(buf, size);
- return *this;
+ return *this;
}
off_t wxBufferedInputStream::SeekI(off_t pos, wxSeekMode mode)
{
- return m_i_streambuf->Seek(pos, mode);
+ return m_i_streambuf->Seek(pos, mode);
}
off_t wxBufferedInputStream::TellI() const
{
- return m_i_streambuf->Tell();
+ return m_i_streambuf->Tell();
}
size_t wxBufferedInputStream::OnSysRead(void *buffer, size_t bufsize)
{
- return m_parent_i_stream->Read(buffer, bufsize).LastRead();
+ return m_parent_i_stream->Read(buffer, bufsize).LastRead();
}
off_t wxBufferedInputStream::OnSysSeek(off_t seek, wxSeekMode mode)
{
- return m_parent_i_stream->SeekI(seek, mode);
+ return m_parent_i_stream->SeekI(seek, mode);
}
off_t wxBufferedInputStream::OnSysTell() const
{
- return m_parent_i_stream->TellI();
+ return m_parent_i_stream->TellI();
+}
+
+void wxBufferedInputStream::SetInputStreamBuffer(wxStreamBuffer *buffer)
+{
+ wxCHECK_RET( buffer, _T("wxBufferedInputStream needs buffer") );
+
+ delete m_i_streambuf;
+ m_i_streambuf = buffer;
}
// ----------------------------------------------------------------------------
// wxBufferedOutputStream
// ----------------------------------------------------------------------------
-wxBufferedOutputStream::wxBufferedOutputStream(wxOutputStream& s)
- : wxFilterOutputStream(s)
+wxBufferedOutputStream::wxBufferedOutputStream(wxOutputStream& s,
+ wxStreamBuffer *buffer)
+ : wxFilterOutputStream(s)
{
- m_o_streambuf = new wxStreamBuffer(*this, wxStreamBuffer::write);
- m_o_streambuf->SetBufferIO(1024);
+ if ( buffer )
+ {
+ m_o_streambuf = buffer;
+ }
+ else // create a default one
+ {
+ m_o_streambuf = new wxStreamBuffer(*this, wxStreamBuffer::write);
+
+ m_o_streambuf->SetBufferIO(1024);
+ }
}
wxBufferedOutputStream::~wxBufferedOutputStream()
{
- delete m_o_streambuf;
+ Sync();
+ delete m_o_streambuf;
}
wxOutputStream& wxBufferedOutputStream::Write(const void *buffer, size_t size)
{
- m_lastcount = 0;
- m_o_streambuf->Write(buffer, size);
- return *this;
+ m_lastcount = 0;
+ m_o_streambuf->Write(buffer, size);
+ return *this;
}
off_t wxBufferedOutputStream::SeekO(off_t pos, wxSeekMode mode)
{
- return m_o_streambuf->Seek(pos, mode);
+ Sync();
+ return m_o_streambuf->Seek(pos, mode);
}
off_t wxBufferedOutputStream::TellO() const
{
- return m_o_streambuf->Tell();
+ return m_o_streambuf->Tell();
}
void wxBufferedOutputStream::Sync()
{
- m_o_streambuf->FlushBuffer();
- m_parent_o_stream->Sync();
+ m_o_streambuf->FlushBuffer();
+ m_parent_o_stream->Sync();
}
size_t wxBufferedOutputStream::OnSysWrite(const void *buffer, size_t bufsize)
{
- return m_parent_o_stream->Write(buffer, bufsize).LastWrite();
+ return m_parent_o_stream->Write(buffer, bufsize).LastWrite();
}
off_t wxBufferedOutputStream::OnSysSeek(off_t seek, wxSeekMode mode)
{
- return m_parent_o_stream->SeekO(seek, mode);
+ return m_parent_o_stream->SeekO(seek, mode);
}
off_t wxBufferedOutputStream::OnSysTell() const
{
- return m_parent_o_stream->TellO();
+ return m_parent_o_stream->TellO();
+}
+
+size_t wxBufferedOutputStream::GetSize() const
+{
+ return m_parent_o_stream->GetSize() + m_o_streambuf->GetIntPosition();
+}
+
+void wxBufferedOutputStream::SetOutputStreamBuffer(wxStreamBuffer *buffer)
+{
+ wxCHECK_RET( buffer, _T("wxBufferedOutputStream needs buffer") );
+
+ delete m_o_streambuf;
+ m_o_streambuf = buffer;
}
// ----------------------------------------------------------------------------
projects / wxWidgets.git / blobdiff