/////////////////////////////////////////////////////////////////////////////
-// 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
+// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
-#ifdef __GNUG__
-#pragma implementation "stream.h"
-#endif
+// ============================================================================
+// declarations
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#include <ctype.h>
#include "wx/stream.h"
#include "wx/datstrm.h"
-#include "wx/objstrm.h"
+#include "wx/textfile.h"
+#include "wx/log.h"
+
+// ----------------------------------------------------------------------------
+// constants
+// ----------------------------------------------------------------------------
+
+// the temporary buffer size used when copying from stream to stream
+#define BUF_TEMP_SIZE 4096
-#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_stream->m_lasterror == wxSTREAM_NO_ERROR )
+ m_stream->m_lasterror = err;
+}
-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)
+void wxStreamBuffer::InitBuffer()
+{
+ m_buffer_start =
+ m_buffer_end =
+ m_buffer_pos = NULL;
+ m_buffer_size = 0;
+
+ // if we are going to allocate the buffer, we should free it later as well
+ m_destroybuf = true;
+}
+
+void wxStreamBuffer::Init()
{
+ InitBuffer();
+
+ m_fixed = true;
}
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 = NULL;
+ m_mode = mode;
+
+ m_flushable = false;
+}
+
+wxStreamBuffer::wxStreamBuffer(wxStreamBase& stream, BufMode mode)
+{
+ Init();
+
+ m_stream = &stream;
+ m_mode = mode;
+
+ m_flushable = 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 crash when the source buffer is
+ // destroyed (otherwise assume the caller knows what he does)
+ wxASSERT_MSG( !buffer.m_destroybuf,
+ _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;
+}
+
+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();
}
-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);
+}
+
+void wxStreamBuffer::SetBufferIO(void *start,
+ size_t len,
+ bool takeOwnership)
+{
+ // start by freeing the old buffer
+ FreeBuffer();
- if (m_destroybuf)
- wxDELETEA(m_buffer_start);
+ m_buffer_start = (char *)start;
+ m_buffer_end = m_buffer_start + len;
- if (!bufsize) {
- m_buffer_start = (char*)NULL;
- m_buffer_end = (char*)NULL;
- m_buffer_pos = (char*)NULL;
- m_buffer_size = 0;
- return;
- }
+ 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;
+ if ( m_stream )
+ {
+ m_stream->Reset();
+ m_stream->m_lastcount = 0;
+ }
+
+ m_buffer_pos = m_mode == read && m_flushable
+ ? m_buffer_end
+ : 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();
+
+ // It's legal to have no stream, so we don't complain about it just return false
+ if ( !inStream )
+ return false;
- count = m_stream->OnSysRead(m_buffer_start, m_buffer_size);
- m_buffer_end = m_buffer_start+count;
- m_buffer_pos = m_buffer_start;
+ size_t count = inStream->OnSysRead(m_buffer_start, m_buffer_size);
+ if ( !count )
+ return false;
- if (count == 0)
- return FALSE;
- return TRUE;
+ 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") );
+
+ // FIXME: what is this check for? (VZ)
+ if ( m_buffer_pos == m_buffer_start )
+ return false;
+
+ wxOutputStream *outStream = GetOutputStream();
- if (m_buffer_pos == m_buffer_start || !m_flushable)
- return FALSE;
+ wxCHECK_MSG( outStream, false, _T("should have a stream in wxStreamBuffer") );
- 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;
+ 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;
+ size_t left = GetBytesLeft();
- 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;
+ 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, sizeof(c));
+ }
+ else
+ {
+ // otherwise check we have enough space left
+ if ( !GetDataLeft() && !FlushBuffer() )
+ {
+ // we don't
+ SetError(wxSTREAM_WRITE_ERROR);
+ }
+ else
+ {
+ PutToBuffer(&c, sizeof(c));
+ m_stream->m_lastcount = 1;
+ }
+ }
}
char wxStreamBuffer::Peek()
{
- char c;
-
- wxASSERT(m_stream != NULL && m_buffer_size != 0);
+ wxCHECK_MSG( m_stream && HasBuffer(), 0,
+ _T("should have the stream and the buffer in wxStreamBuffer") );
- if (!GetDataLeft()) {
- CHECK_ERROR(wxStream_READ_ERR);
- return 0;
- }
+ if ( !GetDataLeft() )
+ {
+ SetError(wxSTREAM_READ_ERROR);
+ return 0;
+ }
- GetFromBuffer(&c, 1);
- m_buffer_pos--;
+ char c;
+ GetFromBuffer(&c, sizeof(c));
+ m_buffer_pos--;
- return c;
+ return c;
}
char wxStreamBuffer::GetChar()
{
- char c;
+ wxInputStream *inStream = GetInputStream();
- wxASSERT(m_stream != NULL);
-
- 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, sizeof(c));
+ }
+ else
+ {
+ if ( !GetDataLeft() )
+ {
+ SetError(wxSTREAM_READ_ERROR);
+ c = 0;
+ }
+ else
+ {
+ GetFromBuffer(&c, sizeof(c));
+ 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);
-
- if (m_mode == write)
- return 0;
-
- // ------------------
- // Buffering disabled
- // ------------------
+ // lasterror is reset before all new IO calls
+ if ( m_stream )
+ m_stream->Reset();
- 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;
+ size_t readBytes;
+ if ( !HasBuffer() )
+ {
+ wxInputStream *inStream = GetInputStream();
- while (size > 0) {
- buf_left = GetDataLeft();
+ wxCHECK_MSG( inStream, 0, _T("should have a stream in wxStreamBuffer") );
- // 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.
+ readBytes = 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;
+ }
+ }
+
+ readBytes = orig_size - size;
+ }
- if (!FillBuffer()) {
- CHECK_ERROR(wxStream_EOF);
- return (m_stream->m_lastcount = orig_size-size);
- }
- } else {
+ if ( m_stream )
+ m_stream->m_lastcount = readBytes;
- // Second case: we just copy from the stream buffer.
- GetFromBuffer(buffer, size);
- break;
- }
- }
- return (m_stream->m_lastcount += orig_size);
+ return readBytes;
}
-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;
+
+ do
+ {
+ nRead = Read(buf, WXSIZEOF(buf));
+ if ( nRead )
+ {
+ nRead = dbuf->Write(buf, nRead);
+ total += nRead;
+ }
+ }
+ while ( nRead );
- while (bytes_read != 0) {
- bytes_read = Read(buf, bytes_read);
- bytes_read = s_buf->Write(buf, bytes_read);
- s += bytes_read;
- }
- return s;
+ 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
- // ------------------
-
- size_t buf_left, orig_size = size;
-
- while (size > 0) {
- buf_left = m_buffer_end - m_buffer_pos;
+ if (m_stream)
+ {
+ // lasterror is reset before all new IO calls
+ m_stream->Reset();
+ }
- // 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.
+ size_t ret;
- if (!FlushBuffer()) {
- CHECK_ERROR(wxStream_WRITE_ERR);
- return (m_stream->m_lastcount = orig_size-size);
- }
+ if ( !HasBuffer() && m_fixed )
+ {
+ wxOutputStream *outStream = GetOutputStream();
- m_buffer_pos = m_buffer_start;
+ wxCHECK_MSG( outStream, 0, _T("should have a stream in wxStreamBuffer") );
- } else {
+ // no buffer, just forward the call to the stream
+ ret = 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_ERROR);
+
+ break;
+ }
+
+ m_buffer_pos = m_buffer_start;
+ }
+ else // we can do it in one gulp
+ {
+ PutToBuffer(buffer, size);
+ size = 0;
+ }
+ }
+
+ ret = orig_size - size;
+ }
- // Second case: just copy it in the stream buffer.
- PutToBuffer(buffer, size);
- break;
+ if (m_stream)
+ {
+ // i am not entirely sure what we do this for
+ m_stream->m_lastcount = ret;
}
- }
- return (m_stream->m_lastcount = orig_size);
+
+ return ret;
}
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;
+ 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") );
- if (m_mode == read)
- return 0;
+ char buf[BUF_TEMP_SIZE];
+ size_t nWrite,
+ total = 0;
- in_stream = (wxInputStream *)sbuf->Stream();
+ 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)
+wxFileOffset wxStreamBuffer::Seek(wxFileOffset pos, wxSeekMode mode)
{
- off_t ret_off, diff, last_access;
+ wxFileOffset ret_off, diff;
- last_access = GetLastAccess();
+ wxFileOffset last_access = GetLastAccess();
- if (!m_flushable) {
- switch (mode) {
- case wxFromStart: diff = pos; break;
- case wxFromCurrent: diff = pos + GetIntPosition(); break;
- case wxFromEnd: diff = pos + last_access; break;
- default: return wxInvalidOffset;
+ if ( !m_flushable )
+ {
+ switch (mode)
+ {
+ case wxFromStart:
+ diff = pos;
+ break;
+
+ 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;
+ size_t int_diff = wx_truncate_cast(size_t, diff);
+ wxCHECK_MSG( (wxFileOffset)int_diff == diff, wxInvalidOffset, wxT("huge file not supported") );
+ SetIntPosition(int_diff);
+ return diff;
}
- if (diff < 0 || diff > last_access)
- return wxInvalidOffset;
- SetIntPosition(diff);
- return diff;
- }
- 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;
+ 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
+ {
+ size_t int_diff = wx_truncate_cast(size_t, diff);
+ wxCHECK_MSG( (wxFileOffset)int_diff == diff, wxInvalidOffset, wxT("huge file not supported") );
+ SetIntPosition(int_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
+wxFileOffset wxStreamBuffer::Tell() const
{
- off_t pos = m_stream->OnSysTell();
- if (pos == wxInvalidOffset)
- return wxInvalidOffset;
+ wxFileOffset pos;
+
+ // ask the stream for position if we have a real one
+ if ( m_stream )
+ {
+ pos = m_stream->OnSysTell();
+ if ( pos == wxInvalidOffset )
+ return wxInvalidOffset;
+ }
+ else // no associated stream
+ {
+ pos = 0;
+ }
pos += GetIntPosition();
-
- if (m_mode == read && m_flushable)
+
+ if ( m_mode == read && m_flushable )
pos -= GetLastAccess();
-
- return pos;
-}
-size_t wxStreamBuffer::GetDataLeft()
-{
- /* Why is this done? RR. */
- if (m_buffer_end == m_buffer_pos && m_flushable)
- FillBuffer();
-
- return m_buffer_end-m_buffer_pos;
+ return pos;
}
// ----------------------------------------------------------------------------
wxStreamBase::wxStreamBase()
{
- m_lasterror = wxStream_NOERROR;
+ m_lasterror = wxSTREAM_NO_ERROR;
m_lastcount = 0;
}
{
}
-size_t wxStreamBase::OnSysRead(void *WXUNUSED(buffer), size_t WXUNUSED(size))
+size_t wxStreamBase::GetSize() const
{
- return 0;
-}
+ wxFileOffset length = GetLength();
+ if ( length == wxInvalidOffset )
+ return 0;
-size_t wxStreamBase::OnSysWrite(const void *WXUNUSED(buffer), size_t WXUNUSED(bufsize))
-{
- return 0;
+ const size_t len = wx_truncate_cast(size_t, length);
+ wxASSERT_MSG( len == length + size_t(0), _T("large files not supported") );
+
+ return len;
}
-off_t wxStreamBase::OnSysSeek(off_t WXUNUSED(seek), wxSeekMode WXUNUSED(mode))
+wxFileOffset wxStreamBase::OnSysSeek(wxFileOffset WXUNUSED(seek), wxSeekMode WXUNUSED(mode))
{
return wxInvalidOffset;
}
-off_t wxStreamBase::OnSysTell() const
+wxFileOffset wxStreamBase::OnSysTell() const
{
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);
}
+bool wxInputStream::CanRead() const
+{
+ // we don't know if there is anything to read or not and by default we
+ // prefer to be optimistic and try to read data unless we know for sure
+ // there is no more of it
+ return m_lasterror != wxSTREAM_EOF;
+}
+
+bool wxInputStream::Eof() const
+{
+ // the only way the base class can know we're at EOF is when we'd already
+ // tried to read beyond it in which case last error is set accordingly
+ return GetLastError() == wxSTREAM_EOF;
+}
+
char *wxInputStream::AllocSpaceWBack(size_t needed_size)
{
- /* get number of bytes left from previous wback buffer */
+ // get number of bytes left from previous wback buffer
size_t toget = m_wbacksize - m_wbackcur;
- /* allocate a buffer large enough to hold prev + new data */
- char *temp_b = (char *) malloc(needed_size + toget);
+ // allocate a buffer large enough to hold prev + new data
+ char *temp_b = (char *)malloc(needed_size + toget);
if (!temp_b)
return NULL;
- /* copy previous data (and free old buffer) if needed */
+ // 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);
}
- /* done */
+ // done
m_wback = temp_b;
m_wbackcur = 0;
m_wbacksize = needed_size + toget;
- return (char *) m_wback;
+ return m_wback;
}
-size_t wxInputStream::GetWBack(char *buf, size_t bsize)
+size_t wxInputStream::GetWBack(void *buf, size_t size)
{
- size_t s_toget = m_wbacksize-m_wbackcur;
-
if (!m_wback)
return 0;
- if (bsize < s_toget)
- s_toget = bsize;
+ // how many bytes do we have in the buffer?
+ size_t toget = m_wbacksize - m_wbackcur;
- memcpy(buf, (m_wback+m_wbackcur), s_toget);
+ if ( size < toget )
+ {
+ // we won't read everything
+ toget = size;
+ }
- m_wbackcur += s_toget;
- if (m_wbackcur == m_wbacksize)
+ // copy the data from the cache
+ memcpy(buf, m_wback + m_wbackcur, toget);
+
+ m_wbackcur += toget;
+ if ( m_wbackcur == m_wbacksize )
{
+ // TODO: should we really free it here all the time? maybe keep it?
free(m_wback);
- m_wback = (char *)NULL;
+ m_wback = NULL;
m_wbacksize = 0;
m_wbackcur = 0;
}
-
- return s_toget;
+
+ // return the number of bytes copied
+ return toget;
}
size_t wxInputStream::Ungetch(const void *buf, size_t bufsize)
{
+ if ( m_lasterror != wxSTREAM_NO_ERROR && m_lasterror != wxSTREAM_EOF )
+ {
+ // can't operate on this stream until the error is cleared
+ return 0;
+ }
+
char *ptrback = AllocSpaceWBack(bufsize);
if (!ptrback)
return 0;
-
+
+ // Eof() shouldn't return true any longer
+ if ( m_lasterror == wxSTREAM_EOF )
+ m_lasterror = wxSTREAM_NO_ERROR;
+
memcpy(ptrback, buf, bufsize);
return bufsize;
}
bool wxInputStream::Ungetch(char c)
{
- char * ptrback = AllocSpaceWBack(1);
- if (!ptrback)
- return FALSE;
-
- *ptrback = c;
- return TRUE;
+ return Ungetch(&c, sizeof(c)) != 0;
}
char wxInputStream::GetC()
{
char c;
- Read(&c, 1);
+ Read(&c, sizeof(c));
return c;
}
-wxInputStream& wxInputStream::Read(void *buffer, size_t size)
+wxInputStream& wxInputStream::Read(void *buf, size_t size)
{
- char *buf = (char *)buffer;
+ char *p = (char *)buf;
+ m_lastcount = 0;
- size_t retsize = GetWBack(buf, size);
- if (retsize == size)
+ size_t read = GetWBack(buf, size);
+ for ( ;; )
{
- m_lastcount = size;
- m_lasterror = wxStream_NOERROR;
- return *this;
+ size -= read;
+ m_lastcount += read;
+ p += read;
+
+ if ( !size )
+ {
+ // we read the requested amount of data
+ break;
+ }
+
+ if ( p != buf && !CanRead() )
+ {
+ // we have already read something and we would block in OnSysRead()
+ // now: don't do it but return immediately
+ break;
+ }
+
+ read = OnSysRead(p, size);
+ if ( !read )
+ {
+ // no more data available
+ break;
+ }
}
- size -= retsize;
- buf += retsize;
- m_lastcount = OnSysRead(buf, size) + retsize;
return *this;
}
char wxInputStream::Peek()
{
char c;
- Read(&c, 1);
- if (m_lasterror == wxStream_NOERROR)
+ Read(&c, sizeof(c));
+ if (m_lasterror == wxSTREAM_NO_ERROR)
{
Ungetch(c);
return c;
}
-
+
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];
- while (bytes_read == BUF_TEMP_SIZE)
+ for ( ;; )
{
- bytes_read = Read(buf, bytes_read).LastRead();
- bytes_read = stream_out.Write(buf, bytes_read).LastWrite();
+ size_t bytes_read = Read(buf, WXSIZEOF(buf)).LastRead();
+ if ( !bytes_read )
+ break;
+
+ if ( stream_out.Write(buf, bytes_read).LastWrite() != bytes_read )
+ break;
}
+
return *this;
}
-off_t wxInputStream::SeekI(off_t pos, wxSeekMode mode)
+wxFileOffset wxInputStream::SeekI(wxFileOffset 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;
+ // RR: This code is duplicated in wxBufferedInputStream. This is
+ // not really a good design, but buffered stream are different
+ // from all other in that they handle two stream-related objects,
+ // the stream buffer and parent stream.
- /* A call to SeekI() will automatically invalidate any previous call
- to Ungetch(), otherwise it would be possible to SeekI() to one
+ // I don't know whether it should be put as well in wxFileInputStream::OnSysSeek
+ if (m_lasterror==wxSTREAM_EOF)
+ m_lasterror=wxSTREAM_NO_ERROR;
+
+ /* RR: A call to SeekI() will automatically invalidate any previous
+ call to Ungetch(), otherwise it would be possible to SeekI() to
one position, unread some bytes there, SeekI() to another position
- and the data would be corrupted. */
- if (m_wback)
+ 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)
{
+ wxLogDebug( wxT("Seeking in stream which has data written back to it.") );
+
free(m_wback);
- m_wback = (char*) NULL;
+ m_wback = NULL;
m_wbacksize = 0;
m_wbackcur = 0;
}
return OnSysSeek(pos, mode);
}
-off_t wxInputStream::TellI() const
+wxFileOffset wxInputStream::TellI() const
{
- return OnSysTell();
-}
+ wxFileOffset pos = OnSysTell();
-// --------------------
-// Overloaded operators
-// --------------------
+ if (pos != wxInvalidOffset)
+ pos -= (m_wbacksize - m_wbackcur);
-#if wxUSE_SERIAL
-wxInputStream& wxInputStream::operator>>(wxObject *& obj)
-{
- wxObjectInputStream obj_s(*this);
- obj = obj_s.LoadObject();
- return *this;
+ return pos;
}
-#endif
// ----------------------------------------------------------------------------
// wxOutputStream
// ----------------------------------------------------------------------------
+
wxOutputStream::wxOutputStream()
- : wxStreamBase()
{
}
{
}
+size_t wxOutputStream::OnSysWrite(const void * WXUNUSED(buffer),
+ size_t WXUNUSED(bufsize))
+{
+ return 0;
+}
+
void wxOutputStream::PutC(char c)
{
- Write((void *) &c, 1);
+ Write(&c, sizeof(c));
}
wxOutputStream& wxOutputStream::Write(const void *buffer, size_t size)
return *this;
}
-off_t wxOutputStream::TellO() const
+wxFileOffset wxOutputStream::TellO() const
{
return OnSysTell();
}
-off_t wxOutputStream::SeekO(off_t pos, wxSeekMode mode)
+wxFileOffset wxOutputStream::SeekO(wxFileOffset pos, wxSeekMode mode)
{
return OnSysSeek(pos, mode);
}
{
}
-#if wxUSE_SERIAL
-wxOutputStream& wxOutputStream::operator<<(wxObject& obj)
-{
- wxObjectOutputStream obj_s(*this);
- obj_s.SaveObject(obj);
- return *this;
-}
-#endif
// ----------------------------------------------------------------------------
// wxCountingOutputStream
// ----------------------------------------------------------------------------
wxCountingOutputStream::wxCountingOutputStream ()
- : wxOutputStream()
{
m_currentPos = 0;
}
-size_t wxCountingOutputStream::GetSize() const
+wxFileOffset wxCountingOutputStream::GetLength() const
{
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;
+ if (m_currentPos > m_lastcount)
+ m_lastcount = m_currentPos;
+
return m_currentPos;
}
-off_t wxCountingOutputStream::OnSysSeek(off_t pos, wxSeekMode mode)
+wxFileOffset wxCountingOutputStream::OnSysSeek(wxFileOffset 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;
-
+ ssize_t new_pos = wx_truncate_cast(ssize_t, pos);
+
+ switch ( mode )
+ {
+ case wxFromStart:
+ wxCHECK_MSG( (wxFileOffset)new_pos == pos, wxInvalidOffset, wxT("huge position not supported") );
+ break;
+
+ case wxFromEnd:
+ new_pos = m_lastcount + new_pos;
+ wxCHECK_MSG( (wxFileOffset)new_pos == (wxFileOffset)(m_lastcount + pos), wxInvalidOffset, wxT("huge position not supported") );
+ break;
+
+ case wxFromCurrent:
+ new_pos = m_currentPos + new_pos;
+ wxCHECK_MSG( (wxFileOffset)new_pos == (wxFileOffset)(m_currentPos + pos), wxInvalidOffset, wxT("huge position not supported") );
+ break;
+
+ default:
+ wxFAIL_MSG( _T("invalid seek mode") );
+ return wxInvalidOffset;
+ }
+
+ m_currentPos = new_pos;
+
+ if (m_currentPos > m_lastcount)
+ m_lastcount = m_currentPos;
+
return m_currentPos;
}
-off_t wxCountingOutputStream::OnSysTell() const
+wxFileOffset wxCountingOutputStream::OnSysTell() const
{
return m_currentPos;
}
-
+
// ----------------------------------------------------------------------------
// wxFilterInputStream
// ----------------------------------------------------------------------------
wxFilterInputStream::wxFilterInputStream()
- : wxInputStream()
{
+ m_parent_i_stream = NULL;
}
wxFilterInputStream::wxFilterInputStream(wxInputStream& stream)
- : wxInputStream()
{
m_parent_i_stream = &stream;
}
// ----------------------------------------------------------------------------
// wxFilterOutputStream
// ----------------------------------------------------------------------------
+
wxFilterOutputStream::wxFilterOutputStream()
- : wxOutputStream()
{
+ m_parent_o_stream = NULL;
}
wxFilterOutputStream::wxFilterOutputStream(wxOutputStream& stream)
- : wxOutputStream()
{
m_parent_o_stream = &stream;
}
// ----------------------------------------------------------------------------
// 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()
{
- off_t unused_bytes=m_i_streambuf->GetBufferPos()-m_i_streambuf->GetBufferEnd();
- m_parent_i_stream->SeekI(unused_bytes,wxFromCurrent);
+ m_parent_i_stream->SeekI(-(wxFileOffset)m_i_streambuf->GetBytesLeft(),
+ wxFromCurrent);
delete m_i_streambuf;
}
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;
+ // reset the error flag
+ Reset();
+
+ // first read from the already cached data
+ m_lastcount = GetWBack(buf, size);
- retsize = GetWBack(buf, size);
- m_lastcount = retsize;
- if (retsize == size)
+ // do we have to read anything more?
+ if ( m_lastcount < size )
{
- m_lasterror = wxStream_NOERROR;
- return *this;
- }
- size -= retsize;
- buf += retsize;
+ size -= m_lastcount;
+ buf = (char *)buf + m_lastcount;
+
+ // the call to wxStreamBuffer::Read() below will reset our m_lastcount,
+ // so save it
+ size_t countOld = m_lastcount;
- m_i_streambuf->Read(buf, size);
+ m_i_streambuf->Read(buf, size);
+
+ m_lastcount += countOld;
+ }
return *this;
}
-off_t wxBufferedInputStream::SeekI(off_t pos, wxSeekMode mode)
+wxFileOffset wxBufferedInputStream::SeekI(wxFileOffset pos, wxSeekMode mode)
{
+ // RR: Look at wxInputStream for comments.
+
+ if (m_lasterror==wxSTREAM_EOF)
+ Reset();
+
+ if (m_wback)
+ {
+ wxLogDebug( wxT("Seeking in stream which has data written back to it.") );
+
+ free(m_wback);
+ m_wback = NULL;
+ m_wbacksize = 0;
+ m_wbackcur = 0;
+ }
+
return m_i_streambuf->Seek(pos, mode);
}
-off_t wxBufferedInputStream::TellI() const
+wxFileOffset wxBufferedInputStream::TellI() const
{
- return m_i_streambuf->Tell();
+ wxFileOffset pos = m_i_streambuf->Tell();
+
+ if (pos != wxInvalidOffset)
+ pos -= (m_wbacksize - m_wbackcur);
+
+ return pos;
}
size_t wxBufferedInputStream::OnSysRead(void *buffer, size_t bufsize)
return m_parent_i_stream->Read(buffer, bufsize).LastRead();
}
-off_t wxBufferedInputStream::OnSysSeek(off_t seek, wxSeekMode mode)
+wxFileOffset wxBufferedInputStream::OnSysSeek(wxFileOffset seek, wxSeekMode mode)
{
return m_parent_i_stream->SeekI(seek, mode);
}
-off_t wxBufferedInputStream::OnSysTell() const
+wxFileOffset wxBufferedInputStream::OnSysTell() const
{
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;
}
+bool wxBufferedOutputStream::Close()
+{
+ Sync();
+ return IsOk();
+}
+
+
wxOutputStream& wxBufferedOutputStream::Write(const void *buffer, size_t size)
{
m_lastcount = 0;
return *this;
}
-off_t wxBufferedOutputStream::SeekO(off_t pos, wxSeekMode mode)
+wxFileOffset wxBufferedOutputStream::SeekO(wxFileOffset pos, wxSeekMode mode)
{
Sync();
return m_o_streambuf->Seek(pos, mode);
}
-off_t wxBufferedOutputStream::TellO() const
+wxFileOffset wxBufferedOutputStream::TellO() const
{
return m_o_streambuf->Tell();
}
return m_parent_o_stream->Write(buffer, bufsize).LastWrite();
}
-off_t wxBufferedOutputStream::OnSysSeek(off_t seek, wxSeekMode mode)
+wxFileOffset wxBufferedOutputStream::OnSysSeek(wxFileOffset seek, wxSeekMode mode)
{
return m_parent_o_stream->SeekO(seek, mode);
}
-off_t wxBufferedOutputStream::OnSysTell() const
+wxFileOffset wxBufferedOutputStream::OnSysTell() const
{
return m_parent_o_stream->TellO();
}
-size_t wxBufferedOutputStream::GetSize() const
+wxFileOffset wxBufferedOutputStream::GetLength() const
{
- return m_parent_o_stream->GetSize() + m_o_streambuf->GetIntPosition();
+ return m_parent_o_stream->GetLength() + m_o_streambuf->GetIntPosition();
+}
+
+void wxBufferedOutputStream::SetOutputStreamBuffer(wxStreamBuffer *buffer)
+{
+ wxCHECK_RET( buffer, _T("wxBufferedOutputStream needs buffer") );
+
+ delete m_o_streambuf;
+ m_o_streambuf = buffer;
}
// ----------------------------------------------------------------------------
wxOutputStream& wxEndL(wxOutputStream& stream)
{
-#ifdef __MSW__
- return stream.Write("\r\n", 2);
-#else
-#ifdef __WXMAC__
- return stream.Write("\r", 1);
-#else
- return stream.Write("\n", 1);
-#endif
-#endif
+ static const wxChar *eol = wxTextFile::GetEOL();
+
+ return stream.Write(eol, wxStrlen(eol));
}
-#endif
- // wxUSE_STREAMS
+#endif // wxUSE_STREAMS
projects / wxWidgets.git / blobdiff