renamed Render's argument to not obfuscate its meaning

[wxWidgets.git] / src / common / zstream.cpp

diff --git a/src/common/zstream.cpp b/src/common/zstream.cpp
index f1380d5b644d42f05f1150e8287945390693fa09..7afa0548ffd9a2e2133782e246521b71161d04b2 100644 (file)
--- a/src/common/zstream.cpp
+++ b/src/common/zstream.cpp
@@ -1,15 +1,15 @@
-/////////////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////////////

 // Name:        zstream.cpp
 // Purpose:     Compressed stream classes
 // Author:      Guilhem Lavaux
 // Name:        zstream.cpp
 // Purpose:     Compressed stream classes
 // Author:      Guilhem Lavaux

-// Modified by:
+// Modified by: Mike Wetherell

 // Created:     11/07/98
 // RCS-ID:      $Id$
 // Copyright:   (c) Guilhem Lavaux
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
 // Created:     11/07/98
 // RCS-ID:      $Id$
 // Copyright:   (c) Guilhem Lavaux
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 

-#ifdef __GNUG__
+#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)

 #pragma implementation "zstream.h"
 #endif
 
 #pragma implementation "zstream.h"
 #endif
 


@@ -37,34 +37,67 @@
    #include "zlib.h"
 #endif
 
    #include "zlib.h"
 #endif
 

-#define ZSTREAM_BUFFER_SIZE 1024
+enum {
+    ZSTREAM_BUFFER_SIZE = 16384,
+    ZSTREAM_GZIP        = 0x10,     // gzip header
+    ZSTREAM_AUTO        = 0x20      // auto detect between gzip and zlib
+};

 
 //////////////////////
 // wxZlibInputStream
 //////////////////////
 
 
 //////////////////////
 // wxZlibInputStream
 //////////////////////
 

-wxZlibInputStream::wxZlibInputStream(wxInputStream& stream)
+wxZlibInputStream::wxZlibInputStream(wxInputStream& stream, int flags)

   : wxFilterInputStream(stream)
 {
   : wxFilterInputStream(stream)
 {

-  // I need a private stream buffer.
-  m_inflate = new z_stream_s;
+  m_inflate = NULL;
+  m_z_buffer = new unsigned char[ZSTREAM_BUFFER_SIZE];
+  m_z_size = ZSTREAM_BUFFER_SIZE;
+  m_pos = 0;

 
 

-  m_inflate->zalloc = (alloc_func)0;
-  m_inflate->zfree = (free_func)0;
-  m_inflate->opaque = (voidpf)0;
+#if WXWIN_COMPATIBILITY_2_4
+  // treat compatibilty mode as auto
+  m_24compatibilty = flags == wxZLIB_24COMPATIBLE;
+  if (m_24compatibilty)
+    flags = wxZLIB_AUTO;
+#endif

 
 

-  int err = inflateInit(m_inflate);
-  if (err != Z_OK) {
-    inflateEnd(m_inflate);
-    delete m_inflate;
-    return;
+  // if gzip is asked for but not supported...
+  if ((flags == wxZLIB_GZIP || flags == wxZLIB_AUTO) && !CanHandleGZip()) {
+    if (flags == wxZLIB_AUTO) {
+      // an error will come later if the input turns out not to be a zlib
+      flags = wxZLIB_ZLIB;
+    }
+    else {
+      wxLogError(_("Gzip not supported by this version of zlib"));
+      m_lasterror = wxSTREAM_READ_ERROR;
+      return;
+    }

   }
 
   }
 

-  m_z_buffer = new unsigned char[ZSTREAM_BUFFER_SIZE];
-  m_z_size = ZSTREAM_BUFFER_SIZE;
+  if (m_z_buffer) {
+    m_inflate = new z_stream_s;
+
+    if (m_inflate) {
+      memset(m_inflate, 0, sizeof(z_stream_s));

 
 

-  m_inflate->avail_in = 0;
-  m_inflate->next_in = NULL;
+      // see zlib.h for documentation on windowBits
+      int windowBits = MAX_WBITS;
+      switch (flags) {
+        case wxZLIB_NO_HEADER:  windowBits = -MAX_WBITS; break;
+        case wxZLIB_ZLIB:       windowBits = MAX_WBITS; break;
+        case wxZLIB_GZIP:       windowBits = MAX_WBITS | ZSTREAM_GZIP; break;
+        case wxZLIB_AUTO:       windowBits = MAX_WBITS | ZSTREAM_AUTO; break;
+        default:                wxFAIL_MSG(wxT("Invalid zlib flag"));
+      }
+
+      if (inflateInit2(m_inflate, windowBits) == Z_OK)
+        return;
+    }
+  }
+
+  wxLogError(_("Can't initialize zlib inflate stream."));
+  m_lasterror = wxSTREAM_READ_ERROR;

 }
 
 wxZlibInputStream::~wxZlibInputStream()
 }
 
 wxZlibInputStream::~wxZlibInputStream()


@@ -77,153 +110,222 @@ wxZlibInputStream::~wxZlibInputStream()
 
 size_t wxZlibInputStream::OnSysRead(void *buffer, size_t size)
 {
 
 size_t wxZlibInputStream::OnSysRead(void *buffer, size_t size)
 {

-  int err;
+  wxASSERT_MSG(m_inflate && m_z_buffer, wxT("Inflate stream not open"));
+
+  if (!m_inflate || !m_z_buffer)
+    m_lasterror = wxSTREAM_READ_ERROR;
+  if (!IsOk() || !size)
+    return 0;

 
 

+  int err = Z_OK;

   m_inflate->next_out = (unsigned char *)buffer;
   m_inflate->avail_out = size;
 
   m_inflate->next_out = (unsigned char *)buffer;
   m_inflate->avail_out = size;
 

-  while (m_inflate->avail_out > 0) {
-    if (m_inflate->avail_in == 0) {
-
-      m_parent_i_stream->Read(m_z_buffer, wxMin(m_z_size, size));
+  while (err == Z_OK && m_inflate->avail_out > 0) {
+    if (m_inflate->avail_in == 0 && m_parent_i_stream->IsOk()) {
+      m_parent_i_stream->Read(m_z_buffer, m_z_size);

       m_inflate->next_in = m_z_buffer;
       m_inflate->avail_in = m_parent_i_stream->LastRead();
       m_inflate->next_in = m_z_buffer;
       m_inflate->avail_in = m_parent_i_stream->LastRead();

+    }
+    err = inflate(m_inflate, Z_SYNC_FLUSH);
+  }

 
 

-      wxStreamError err = m_parent_i_stream->GetLastError();
-      if ( err != wxSTREAM_NO_ERROR && err != wxSTREAM_EOF)
-      { 
-        m_lasterror = err;
-        return 0; // failed to read anything
+  switch (err) {
+    case Z_OK:
+        break;
+
+    case Z_STREAM_END:
+      // Unread any data taken from past the end of the deflate stream, so that
+      // any additional data can be read from the underlying stream (the crc
+      // in a gzip for example)
+      if (m_inflate->avail_in) {
+        m_parent_i_stream->Ungetch(m_inflate->next_in, m_inflate->avail_in);
+        m_inflate->avail_in = 0;

       }
       }

-
-      if ( m_inflate->avail_in == 0 )
-      {
-          // EOF
+      m_lasterror = wxSTREAM_EOF;
+      break;
+
+    case Z_BUF_ERROR:
+      // Indicates that zlib was expecting more data, but the parent stream
+      // has none. Other than Eof the error will have been already reported
+      // by the parent strean,
+      m_lasterror = wxSTREAM_READ_ERROR;
+      if (m_parent_i_stream->Eof())
+#if WXWIN_COMPATIBILITY_2_4
+        if (m_24compatibilty)

           m_lasterror = wxSTREAM_EOF;
           m_lasterror = wxSTREAM_EOF;

-          break;
-      }
-    }
-    err = inflate(m_inflate, Z_FINISH);
-    if (err == Z_STREAM_END)
-      return (size - m_inflate->avail_out);
+        else
+#endif
+          wxLogError(_("Can't read inflate stream: unexpected EOF in underlying stream."));
+      break;
+
+    default:
+      wxString msg(m_inflate->msg, *wxConvCurrent);
+      if (!msg)
+        msg.Format(_("zlib error %d"), err);
+      wxLogError(_("Can't read from inflate stream: %s"), msg.c_str());
+      m_lasterror = wxSTREAM_READ_ERROR;

   }
 
   }
 

-  return size-m_inflate->avail_out;
+  size -= m_inflate->avail_out;
+  m_pos += size;
+  return size;
+}
+
+/* static */ bool wxZlibInputStream::CanHandleGZip()
+{
+  const char *dot = strchr(zlibVersion(), '.');
+  int major = atoi(zlibVersion());
+  int minor = dot ? atoi(dot + 1) : 0;
+  return major > 1 || (major == 1 && minor >= 2);

 }
 
 }
 

+

 //////////////////////
 // wxZlibOutputStream
 //////////////////////
 
 //////////////////////
 // wxZlibOutputStream
 //////////////////////
 

-wxZlibOutputStream::wxZlibOutputStream(wxOutputStream& stream, int level)
+wxZlibOutputStream::wxZlibOutputStream(wxOutputStream& stream,
+                                       int level,
+                                       int flags)

  : wxFilterOutputStream(stream)
 {
  : wxFilterOutputStream(stream)
 {

-  int err;
-
-  m_deflate = new z_stream_s;
-
-  m_deflate->zalloc = (alloc_func)0;
-  m_deflate->zfree = (free_func)0;
-  m_deflate->opaque = (voidpf)0;
+  m_deflate = NULL;
+  m_z_buffer = new unsigned char[ZSTREAM_BUFFER_SIZE];
+  m_z_size = ZSTREAM_BUFFER_SIZE;
+  m_pos = 0;

 
   if ( level == -1 )
   {
 
   if ( level == -1 )
   {

-      level = Z_DEFAULT_COMPRESSION;
+    level = Z_DEFAULT_COMPRESSION;

   }
   else
   {
     wxASSERT_MSG(level >= 0 && level <= 9, wxT("wxZlibOutputStream compression level must be between 0 and 9!"));
   }
 
   }
   else
   {
     wxASSERT_MSG(level >= 0 && level <= 9, wxT("wxZlibOutputStream compression level must be between 0 and 9!"));
   }
 

-  err = deflateInit(m_deflate, level);
-  if (err != Z_OK) {
-    deflateEnd(m_deflate);
+  // if gzip is asked for but not supported...
+  if (flags == wxZLIB_GZIP && !CanHandleGZip()) {
+    wxLogError(_("Gzip not supported by this version of zlib"));
+    m_lasterror = wxSTREAM_WRITE_ERROR;

     return;
   }
 
     return;
   }
 

-  m_z_buffer = new unsigned char[ZSTREAM_BUFFER_SIZE];
-  m_z_size = ZSTREAM_BUFFER_SIZE;
-
-  m_deflate->avail_in = 0;
-  m_deflate->next_out = m_z_buffer;
-  m_deflate->avail_out = m_z_size;
-}
+  if (m_z_buffer) {
+    m_deflate = new z_stream_s;

 
 

-wxZlibOutputStream::~wxZlibOutputStream()
-{
-  int err;
+    if (m_deflate) {
+      memset(m_deflate, 0, sizeof(z_stream_s));
+      m_deflate->next_out = m_z_buffer;
+      m_deflate->avail_out = m_z_size;

 
 

-  Sync();
+      // see zlib.h for documentation on windowBits
+      int windowBits = MAX_WBITS;
+      switch (flags) {
+        case wxZLIB_NO_HEADER:  windowBits = -MAX_WBITS; break;
+        case wxZLIB_ZLIB:       windowBits = MAX_WBITS; break;
+        case wxZLIB_GZIP:       windowBits = MAX_WBITS | ZSTREAM_GZIP; break;
+        default:                wxFAIL_MSG(wxT("Invalid zlib flag"));
+      }

 
 

-  err = deflate(m_deflate, Z_FINISH);
-  if (err != Z_STREAM_END) 
-  {
-    wxLogDebug( wxT("wxZlibOutputStream: an error occured while closing the stream.\n") );
-    return;
+      if (deflateInit2(m_deflate, level, Z_DEFLATED, windowBits,
+                       8, Z_DEFAULT_STRATEGY) == Z_OK)
+        return;
+    }

   }
 
   }
 

-  deflateEnd(m_deflate);
-  delete m_deflate;
-
-  delete[] m_z_buffer;
+  wxLogError(_("Can't initialize zlib deflate stream."));
+  m_lasterror = wxSTREAM_WRITE_ERROR;

 }
 
 }
 

-void wxZlibOutputStream::Sync()
-{
-  int err;
+bool wxZlibOutputStream::Close()
+ {
+  DoFlush(true);
+   deflateEnd(m_deflate);
+   delete m_deflate;

 
 

-  m_parent_o_stream->Write(m_z_buffer, m_z_size-m_deflate->avail_out);
-  m_deflate->next_out  = m_z_buffer;
-  m_deflate->avail_out = m_z_size;
+  m_deflate = NULL;
+   delete[] m_z_buffer;
+  m_z_buffer = NULL;
+  return IsOk();
+ }

 
 

-  err = deflate(m_deflate, Z_FULL_FLUSH);
-  if (err != Z_OK) {
+void wxZlibOutputStream::DoFlush(bool final)
+{
+  if (!m_deflate || !m_z_buffer)
+    m_lasterror = wxSTREAM_WRITE_ERROR;
+  if (!IsOk())

     return;
     return;

-  }

 
 

-  // Fixed by "Stefan Csomor" <csomor@advancedconcepts.ch>
-  while( m_deflate->avail_out == 0 )
-  {
-     m_parent_o_stream->Write(m_z_buffer, m_z_size );
-     m_deflate->next_out  = m_z_buffer;
-     m_deflate->avail_out = m_z_size;
-     err = deflate(m_deflate, Z_FULL_FLUSH);
-     if (err != Z_OK) {
-        return;
-     }
-  }
-  // End
+  int err = Z_OK;
+  bool done = false;

 
 

-  m_parent_o_stream->Write(m_z_buffer, m_z_size-m_deflate->avail_out);
-  m_deflate->next_out  = m_z_buffer;
-  m_deflate->avail_out = m_z_size;
+  while (err == Z_OK || err == Z_STREAM_END) {
+    size_t len = m_z_size  - m_deflate->avail_out;
+    if (len) {
+      if (m_parent_o_stream->Write(m_z_buffer, len).LastWrite() != len) {
+        m_lasterror = wxSTREAM_WRITE_ERROR;
+        wxLogDebug(wxT("wxZlibOutputStream: Error writing to underlying stream"));
+        break;
+      }
+      m_deflate->next_out = m_z_buffer;
+      m_deflate->avail_out = m_z_size;
+    }
+
+    if (done)
+      break;
+    err = deflate(m_deflate, final ? Z_FINISH : Z_FULL_FLUSH);
+    done = m_deflate->avail_out != 0 || err == Z_STREAM_END;
+  }

 }
 
 size_t wxZlibOutputStream::OnSysWrite(const void *buffer, size_t size)
 {
 }
 
 size_t wxZlibOutputStream::OnSysWrite(const void *buffer, size_t size)
 {

-  int err;
+  wxASSERT_MSG(m_deflate && m_z_buffer, wxT("Deflate stream not open"));

 
 

+  if (!m_deflate || !m_z_buffer)
+    m_lasterror = wxSTREAM_WRITE_ERROR;
+  if (!IsOk() || !size)
+    return 0;
+
+  int err = Z_OK;

   m_deflate->next_in = (unsigned char *)buffer;
   m_deflate->avail_in = size;
 
   m_deflate->next_in = (unsigned char *)buffer;
   m_deflate->avail_in = size;
 

-  while (m_deflate->avail_in > 0) {
-
+  while (err == Z_OK && m_deflate->avail_in > 0) {

     if (m_deflate->avail_out == 0) {
       m_parent_o_stream->Write(m_z_buffer, m_z_size);
     if (m_deflate->avail_out == 0) {
       m_parent_o_stream->Write(m_z_buffer, m_z_size);

-      if ( !*m_parent_o_stream )
-        return (size - m_deflate->avail_in);
+      if (m_parent_o_stream->LastWrite() != m_z_size) {
+        m_lasterror = wxSTREAM_WRITE_ERROR;
+        wxLogDebug(wxT("wxZlibOutputStream: Error writing to underlying stream"));
+        break;
+      }

 
       m_deflate->next_out = m_z_buffer;
       m_deflate->avail_out = m_z_size;
     }
 
     err = deflate(m_deflate, Z_NO_FLUSH);
 
       m_deflate->next_out = m_z_buffer;
       m_deflate->avail_out = m_z_size;
     }
 
     err = deflate(m_deflate, Z_NO_FLUSH);

-    if (err != Z_OK)
-      return (size - m_deflate->avail_in);

   }
   }

+
+  if (err != Z_OK) {
+    m_lasterror = wxSTREAM_WRITE_ERROR;
+    wxString msg(m_deflate->msg, *wxConvCurrent);
+    if (!msg)
+      msg.Format(_("zlib error %d"), err);
+    wxLogError(_("Can't write to deflate stream: %s"), msg.c_str());
+  }
+
+  size -= m_deflate->avail_in;
+  m_pos += size;

   return size;
 }
 
   return size;
 }
 

+/* static */ bool wxZlibOutputStream::CanHandleGZip()
+{
+  return wxZlibInputStream::CanHandleGZip();
+}
+

 #endif
   // wxUSE_ZLIB && wxUSE_STREAMS
 #endif
   // wxUSE_ZLIB && wxUSE_STREAMS

-  
+