X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/3d4c6a214ac5b00dbf5e314e369471135db81c0d..6842d18650b487249b4ae29d0d7e17231b24cde8:/src/common/stream.cpp?ds=inline diff --git a/src/common/stream.cpp b/src/common/stream.cpp index fc7bcc8b9a..ed5190b1dc 100644 --- a/src/common/stream.cpp +++ b/src/common/stream.cpp @@ -13,42 +13,630 @@ #pragma implementation "stream.h" #endif -#include -#include "stream.h" - -#if !USE_SHARED_LIBRARY -IMPLEMENT_ABSTRACT_CLASS(wxInputStream, wxObject) -IMPLEMENT_ABSTRACT_CLASS(wxOutputStream, wxObject) -IMPLEMENT_ABSTRACT_CLASS2(wxStream, wxInputStream, wxOutputStream) -IMPLEMENT_CLASS(wxFilterInputStream, wxInputStream) +// For compilers that support precompilation, includes "wx.h". +#include "wx/wxprec.h" + +#ifdef __BORLANDC__ + #pragma hdrstop +#endif + +#ifndef WX_PRECOMP + #include "wx/defs.h" #endif +#if wxUSE_STREAMS + +#include +#include "wx/stream.h" +#include "wx/datstrm.h" +#include "wx/objstrm.h" + +#define BUF_TEMP_SIZE 10000 + +// ---------------------------------------------------------------------------- +// wxStreamBuffer +// ---------------------------------------------------------------------------- + +#define CHECK_ERROR(err) \ + if (m_stream->m_lasterror == wxStream_NOERROR) \ + 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) +{ +} + +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(); +} + +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; +} + +wxStreamBuffer::~wxStreamBuffer() +{ + if (m_destroybuf) + wxDELETEA(m_buffer_start); + if (m_destroystream) + delete m_stream; +} + +void wxStreamBuffer::SetBufferIO(char *buffer_start, char *buffer_end) +{ + if (m_destroybuf) + wxDELETEA(m_buffer_start); + m_buffer_start = buffer_start; + m_buffer_end = buffer_end; + + m_buffer_size = m_buffer_end-m_buffer_start; + m_destroybuf = FALSE; + ResetBuffer(); +} + +void wxStreamBuffer::SetBufferIO(size_t bufsize) +{ + char *b_start; + + if (m_destroybuf) + wxDELETEA(m_buffer_start); + + if (!bufsize) { + m_buffer_start = NULL; + m_buffer_end = NULL; + m_buffer_pos = NULL; + m_buffer_size = 0; + return; + } + + b_start = new char[bufsize]; + SetBufferIO(b_start, b_start + bufsize); + m_destroybuf = TRUE; +} + +void wxStreamBuffer::ResetBuffer() +{ + m_stream->m_lasterror = wxStream_NOERROR; + m_stream->m_lastcount = 0; + if (m_mode == read) + m_buffer_pos = m_buffer_end; + else + m_buffer_pos = m_buffer_start; +} + +bool wxStreamBuffer::FillBuffer() +{ + size_t count; + + count = m_stream->OnSysRead(m_buffer_start, m_buffer_size); + m_buffer_end = m_buffer_start+count; + m_buffer_pos = m_buffer_start; + + if (count == 0) + return FALSE; + return TRUE; +} + +bool wxStreamBuffer::FlushBuffer() +{ + size_t count, current; + + if (m_buffer_pos == m_buffer_start || !m_flushable) + 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; + + return TRUE; +} + +void wxStreamBuffer::GetFromBuffer(void *buffer, size_t size) +{ + size_t s_toget = m_buffer_end-m_buffer_pos; + + if (size < s_toget) + s_toget = size; + + memcpy(buffer, m_buffer_pos, s_toget); + m_buffer_pos += s_toget; +} + +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; + } + s_toput = size; + } + if (s_toput > size) + s_toput = size; + memcpy(m_buffer_pos, buffer, s_toput); + m_buffer_pos += s_toput; +} + +void wxStreamBuffer::PutChar(char c) +{ + wxASSERT(m_stream != NULL); + + if (!m_buffer_size) { + m_stream->OnSysWrite(&c, 1); + return; + } + + if (GetDataLeft() == 0 && !FlushBuffer()) { + CHECK_ERROR(wxStream_WRITE_ERR); + return; + } + + PutToBuffer(&c, 1); + m_stream->m_lastcount = 1; +} + +char wxStreamBuffer::Peek() +{ + char c; + + wxASSERT(m_stream != NULL && m_buffer_size != 0); + + if (!GetDataLeft()) { + CHECK_ERROR(wxStream_READ_ERR); + return 0; + } + + GetFromBuffer(&c, 1); + m_buffer_pos--; + + return c; +} + +char wxStreamBuffer::GetChar() +{ + char c; + + wxASSERT(m_stream != NULL); + + if (!m_buffer_size) { + m_stream->OnSysRead(&c, 1); + return c; + } + + if (!GetDataLeft()) { + CHECK_ERROR(wxStream_READ_ERR); + return 0; + } + + GetFromBuffer(&c, 1); + + m_stream->m_lastcount = 1; + return c; +} + +size_t wxStreamBuffer::Read(void *buffer, size_t size) +{ + wxASSERT(m_stream != NULL); + + if (m_mode == write) + return 0; + + // ------------------ + // 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; + } + } + return (m_stream->m_lastcount += orig_size); +} + +size_t wxStreamBuffer::Read(wxStreamBuffer *s_buf) +{ + char buf[BUF_TEMP_SIZE]; + size_t s = 0, bytes_read = BUF_TEMP_SIZE; + + if (m_mode == write) + return 0; + + while (bytes_read != 0) { + bytes_read = Read(buf, bytes_read); + bytes_read = s_buf->Write(buf, bytes_read); + s += bytes_read; + } + return s; +} + +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; + + // 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; + } + } + return (m_stream->m_lastcount = orig_size); +} + +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(); + + 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; +} + +off_t wxStreamBuffer::Seek(off_t pos, wxSeekMode mode) +{ + off_t ret_off, diff, last_access; + + last_access = GetLastAccess(); + + if (!m_flushable) { + diff = pos + GetIntPosition(); + 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; +} + +off_t wxStreamBuffer::Tell() const +{ + off_t pos; + + if (m_flushable) { + pos = m_stream->OnSysTell(); + if (pos == wxInvalidOffset) + return wxInvalidOffset; + return pos - GetLastAccess() + GetIntPosition(); + } else + return GetIntPosition(); +} + +size_t wxStreamBuffer::GetDataLeft() +{ + if (m_buffer_end == m_buffer_pos && m_flushable) + FillBuffer(); + return m_buffer_end-m_buffer_pos; +} + +// ---------------------------------------------------------------------------- +// wxStreamBase +// ---------------------------------------------------------------------------- + +wxStreamBase::wxStreamBase() +{ + 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; +} + +off_t wxStreamBase::OnSysTell() const +{ + return wxInvalidOffset; +} + +// ---------------------------------------------------------------------------- +// wxInputStream +// ---------------------------------------------------------------------------- + wxInputStream::wxInputStream() - : wxObject() + : wxStreamBase(), + m_wback(NULL), m_wbacksize(0), m_wbackcur(0) { } wxInputStream::~wxInputStream() { + if (m_wback) + free(m_wback); } -#define BUF_TEMP_SIZE 10000 +char *wxInputStream::AllocSpaceWBack(size_t needed_size) +{ + char *temp_b; + size_t old_size; + + old_size = m_wbacksize; + m_wbacksize += needed_size; + + if (!m_wback) + temp_b = (char *)malloc(m_wbacksize); + else + temp_b = (char *)realloc(m_wback, m_wbacksize); + + if (!temp_b) + return NULL; + m_wback = temp_b; + + memmove(m_wback+needed_size, m_wback, old_size); + + return (char *)(m_wback); +} + +size_t wxInputStream::GetWBack(char *buf, size_t bsize) +{ + size_t s_toget = m_wbacksize-m_wbackcur; + + if (!m_wback) + return 0; + + if (bsize < s_toget) + s_toget = bsize; + + memcpy(buf, (m_wback+m_wbackcur), s_toget); + + m_wbackcur += s_toget; + if (m_wbackcur == m_wbacksize) { + free(m_wback); + m_wback = (char *)NULL; + m_wbacksize = 0; + m_wbackcur = 0; + } + + return s_toget; +} + +size_t wxInputStream::Ungetch(const void *buf, size_t bufsize) +{ + char *ptrback; + + ptrback = AllocSpaceWBack(bufsize); + if (!ptrback) + return 0; + + memcpy(ptrback, buf, bufsize); + return bufsize; +} + +bool wxInputStream::Ungetch(char c) +{ + char *ptrback; + + ptrback = AllocSpaceWBack(1); + if (!ptrback) + return FALSE; + + *ptrback = c; + return TRUE; +} + +char wxInputStream::GetC() +{ + char c; + Read(&c, 1); + return c; +} + +wxInputStream& wxInputStream::Read(void *buffer, size_t size) +{ + size_t retsize; + char *buf = (char *)buffer; + + retsize = GetWBack(buf, size); + if (retsize == size) { + m_lastcount = size; + m_lasterror = wxStream_NOERROR; + return *this; + } + size -= retsize; + buf += retsize; + + m_lastcount = OnSysRead(buf, size); + return *this; +} + +char wxInputStream::Peek() +{ + char c; + + Read(&c, 1); + if (m_lasterror == wxStream_NOERROR) { + Ungetch(c); + return c; + } + return 0; +} wxInputStream& wxInputStream::Read(wxOutputStream& stream_out) { char buf[BUF_TEMP_SIZE]; size_t bytes_read = BUF_TEMP_SIZE; - while (bytes_read == BUF_TEMP_SIZE && !stream_out.Bad()) { + while (bytes_read == BUF_TEMP_SIZE) { bytes_read = Read(buf, bytes_read).LastRead(); - - stream_out.Write(buf, bytes_read); + 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; + + return OnSysSeek(pos, mode); +} + +off_t wxInputStream::TellI() const +{ + return OnSysTell(); +} + +// -------------------- +// Overloaded operators +// -------------------- + +#if wxUSE_SERIAL +wxInputStream& wxInputStream::operator>>(wxObject *& obj) +{ + wxObjectInputStream obj_s(*this); + obj = obj_s.LoadObject(); + return *this; +} +#endif + + +// ---------------------------------------------------------------------------- +// wxOutputStream +// ---------------------------------------------------------------------------- wxOutputStream::wxOutputStream() - : wxObject() + : wxStreamBase() { } @@ -56,18 +644,258 @@ wxOutputStream::~wxOutputStream() { } +wxOutputStream& wxOutputStream::Write(const void *buffer, size_t size) +{ + 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(); +} + +off_t wxOutputStream::SeekO(off_t pos, wxSeekMode 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; +} +#endif + +// ---------------------------------------------------------------------------- +// wxCountingOutputStream +// ---------------------------------------------------------------------------- + +wxCountingOutputStream::wxCountingOutputStream () + : wxOutputStream() +{ + m_currentPos = 0; +} + +size_t wxCountingOutputStream::GetSize() const +{ + return m_lastcount; +} + +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; +} + +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; // ? +} + +off_t wxCountingOutputStream::OnSysTell() const +{ + return m_currentPos; // ? +} + +// ---------------------------------------------------------------------------- +// wxFilterInputStream +// ---------------------------------------------------------------------------- + +wxFilterInputStream::wxFilterInputStream() + : wxInputStream() +{ } wxFilterInputStream::wxFilterInputStream(wxInputStream& stream) : wxInputStream() { - m_parent_stream = &stream; + m_parent_i_stream = &stream; } wxFilterInputStream::~wxFilterInputStream() { } + +// ---------------------------------------------------------------------------- +// wxFilterOutputStream +// ---------------------------------------------------------------------------- +wxFilterOutputStream::wxFilterOutputStream() + : wxOutputStream() +{ +} + +wxFilterOutputStream::wxFilterOutputStream(wxOutputStream& stream) + : wxOutputStream() +{ + m_parent_o_stream = &stream; +} + +wxFilterOutputStream::~wxFilterOutputStream() +{ +} + +// ---------------------------------------------------------------------------- +// wxBufferedInputStream +// ---------------------------------------------------------------------------- +wxBufferedInputStream::wxBufferedInputStream(wxInputStream& s) + : wxFilterInputStream(s) +{ + m_i_streambuf = new wxStreamBuffer(*this, wxStreamBuffer::read); + m_i_streambuf->SetBufferIO(1024); +} + +wxBufferedInputStream::~wxBufferedInputStream() +{ + delete m_i_streambuf; +} + +char wxBufferedInputStream::Peek() +{ + return m_i_streambuf->Peek(); +} + +wxInputStream& wxBufferedInputStream::Read(void *buffer, size_t size) +{ + size_t retsize; + char *buf = (char *)buffer; + + retsize = GetWBack(buf, size); + m_lastcount = retsize; + if (retsize == size) { + m_lasterror = wxStream_NOERROR; + return *this; + } + size -= retsize; + buf += retsize; + + m_i_streambuf->Read(buf, size); + + return *this; +} + +off_t wxBufferedInputStream::SeekI(off_t pos, wxSeekMode mode) +{ + return m_i_streambuf->Seek(pos, mode); +} + +off_t wxBufferedInputStream::TellI() const +{ + return m_i_streambuf->Tell(); +} + +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) +{ + return m_parent_i_stream->SeekI(seek, mode); +} + +off_t wxBufferedInputStream::OnSysTell() const +{ + return m_parent_i_stream->TellI(); +} + +// ---------------------------------------------------------------------------- +// wxBufferedOutputStream +// ---------------------------------------------------------------------------- + +wxBufferedOutputStream::wxBufferedOutputStream(wxOutputStream& s) + : wxFilterOutputStream(s) +{ + m_o_streambuf = new wxStreamBuffer(*this, wxStreamBuffer::write); + m_o_streambuf->SetBufferIO(1024); +} + +wxBufferedOutputStream::~wxBufferedOutputStream() +{ + delete m_o_streambuf; +} + +wxOutputStream& wxBufferedOutputStream::Write(const void *buffer, size_t size) +{ + 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); +} + +off_t wxBufferedOutputStream::TellO() const +{ + return m_o_streambuf->Tell(); +} + +void wxBufferedOutputStream::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(); +} + +off_t wxBufferedOutputStream::OnSysSeek(off_t seek, wxSeekMode mode) +{ + return m_parent_o_stream->SeekO(seek, mode); +} + +off_t wxBufferedOutputStream::OnSysTell() const +{ + return m_parent_o_stream->TellO(); +} + +// ---------------------------------------------------------------------------- +// Some IOManip function +// ---------------------------------------------------------------------------- + +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 +} + +#endif + // wxUSE_STREAMS