X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/8cbc39e803460d493c2783c4474123a3b1817c03..ea8f6fc718c121d91e5026840d3f22160d83e512:/src/common/zstream.cpp

diff --git a/src/common/zstream.cpp b/src/common/zstream.cpp
index 2636efd14b..678b0d7485 100644
--- a/src/common/zstream.cpp
+++ b/src/common/zstream.cpp
@@ -1,15 +1,15 @@
-/////////////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////////////
 // 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
 /////////////////////////////////////////////////////////////////////////////
 
-#ifdef __GNUG__
+#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
 #pragma implementation "zstream.h"
 #endif
 
@@ -37,34 +37,56 @@
    #include "zlib.h"
 #endif
 
-#define ZSTREAM_BUFFER_SIZE 1024
+enum {
+#ifdef __WIN16__
+    ZSTREAM_BUFFER_SIZE = 4096
+#else
+    ZSTREAM_BUFFER_SIZE = 16384
+#endif
+};
 
 //////////////////////
 // wxZlibInputStream
 //////////////////////
 
-wxZlibInputStream::wxZlibInputStream(wxInputStream& stream)
+wxZlibInputStream::wxZlibInputStream(wxInputStream& stream, int flags)
   : wxFilterInputStream(stream)
 {
-  // I need a private stream buffer.
-  m_inflate = new z_stream_s;
-
-  m_inflate->zalloc = (alloc_func)0;
-  m_inflate->zfree = (free_func)0;
-  m_inflate->opaque = (voidpf)0;
-
-  int err = inflateInit(m_inflate);
-  if (err != Z_OK) {
-    inflateEnd(m_inflate);
-    delete m_inflate;
-    return;
-  }
-
+  m_inflate = NULL;
   m_z_buffer = new unsigned char[ZSTREAM_BUFFER_SIZE];
   m_z_size = ZSTREAM_BUFFER_SIZE;
+  m_pos = 0;
+
+  if (m_z_buffer) {
+    m_inflate = new z_stream_s;
+
+    if (m_inflate) {
+      m_inflate->zalloc = (alloc_func)0;
+      m_inflate->zfree = (free_func)0;
+      m_inflate->opaque = (voidpf)0;
+      m_inflate->avail_in = 0;
+      m_inflate->next_in = NULL;
+      m_inflate->next_out = NULL;
+
+      wxASSERT((flags & ~(wxZLIB_ZLIB | wxZLIB_GZIP)) == 0);
+ 
+      // when autodetecting between gzip & zlib, silently drop gzip flag
+      // if the version of zlib doesn't support it
+      if (flags == (wxZLIB_ZLIB | wxZLIB_GZIP)
+              && strcmp(zlib_version, "1.2.") < 0)
+        flags &= ~wxZLIB_GZIP;
+
+      int bits = flags ? MAX_WBITS : -MAX_WBITS;
+      if (flags & wxZLIB_GZIP)
+        bits |= (flags & wxZLIB_ZLIB) ? 0x20 : 0x10;
+
+      if (inflateInit2(m_inflate, bits) == Z_OK)
+        return;
+    }
+  }
 
-  m_inflate->avail_in = 0;
-  m_inflate->next_in = NULL;
+  wxLogError(_("Can't initialize zlib inflate stream."));
+  m_lasterror = wxSTREAM_READ_ERROR;
 }
 
 wxZlibInputStream::~wxZlibInputStream()
@@ -77,144 +99,185 @@ wxZlibInputStream::~wxZlibInputStream()
 
 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;
 
-  while (m_inflate->avail_out > 0) {
+  while (err == Z_OK && m_inflate->avail_out > 0) {
     if (m_inflate->avail_in == 0) {
-
-      m_parent_i_stream->Read(m_z_buffer, wxMin(m_z_size, size));
+      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();
 
-      if (m_parent_i_stream->LastError() != wxStream_NOERROR &&
-          m_parent_i_stream->LastError() != wxStream_EOF)
-      { 
-        m_lasterror = m_parent_i_stream->LastError();
-        return 0; // failed to read anything
+      if (m_inflate->avail_in == 0) {
+        if (m_parent_i_stream->Eof())
+          wxLogError(_("Can't read inflate stream: unexpected EOF in underlying stream."));
+        m_lasterror = wxSTREAM_READ_ERROR;
+        break;
       }
+    }
+    err = inflate(m_inflate, Z_NO_FLUSH);
+  }
 
-      if ( m_inflate->avail_in == 0 )
-      {
-          // EOF
-          m_lasterror = wxStream_EOF;
-          break;
-      }
+  if (err == 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;
     }
-    err = inflate(m_inflate, Z_FINISH);
-    if (err == Z_STREAM_END)
-      return (size - m_inflate->avail_out);
+    m_lasterror = wxSTREAM_EOF;
+  } else if (err != Z_OK) {
+    wxString msg(m_inflate->msg, *wxConvCurrent);
+    if (!msg)
+      msg.Format(_("zlib error %d"), err);
+    wxLogError(_("Can't read from inflate stream: %s\n"), msg.c_str());
+    m_lasterror = wxSTREAM_READ_ERROR;
   }
 
-  return size-m_inflate->avail_out;
+  size -= m_inflate->avail_out;
+  m_pos += size;
+  return size;
 }
 
 //////////////////////
 // wxZlibOutputStream
 //////////////////////
 
-wxZlibOutputStream::wxZlibOutputStream(wxOutputStream& stream, int level)
+wxZlibOutputStream::wxZlibOutputStream(wxOutputStream& stream,
+                                       int level,
+                                       int flags)
  : 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;
-
-  if (level == -1) level = Z_DEFAULT_COMPRESSION;
-  wxASSERT_MSG(level >= 0 && level <= 9, wxT("wxZlibOutputStream compression level must be between 0 and 9!"));
+  m_deflate = NULL;
+  m_z_buffer = new unsigned char[ZSTREAM_BUFFER_SIZE];
+  m_z_size = ZSTREAM_BUFFER_SIZE;
+  m_pos = 0;
 
-  err = deflateInit(m_deflate, level);
-  if (err != Z_OK) {
-    deflateEnd(m_deflate);
-    return;
+  if ( level == -1 )
+  {
+    level = Z_DEFAULT_COMPRESSION;
+  }
+  else
+  {
+    wxASSERT_MSG(level >= 0 && level <= 9, wxT("wxZlibOutputStream compression level must be between 0 and 9!"));
   }
 
-  m_z_buffer = new unsigned char[ZSTREAM_BUFFER_SIZE];
-  m_z_size = ZSTREAM_BUFFER_SIZE;
+  if (m_z_buffer) {
+     m_deflate = new z_stream_s;
+
+     if (m_deflate) {
+        m_deflate->zalloc = (alloc_func)0;
+        m_deflate->zfree = (free_func)0;
+        m_deflate->opaque = (voidpf)0;
+        m_deflate->avail_in = 0;
+        m_deflate->next_out = m_z_buffer;
+        m_deflate->avail_out = m_z_size;
+
+        wxASSERT(flags == 0 || flags == wxZLIB_ZLIB || flags == wxZLIB_GZIP);
+ 
+        int bits = flags ? MAX_WBITS : -MAX_WBITS;
+        if (flags & wxZLIB_GZIP)
+            bits |= 0x10;
+
+        if (deflateInit2(m_deflate, level, Z_DEFLATED, bits, 
+                         8, Z_DEFAULT_STRATEGY) == Z_OK)
+          return;
+     }
+  }
 
-  m_deflate->avail_in = 0;
-  m_deflate->next_out = m_z_buffer;
-  m_deflate->avail_out = m_z_size;
+  wxLogError(_("Can't initialize zlib deflate stream."));
+  m_lasterror = wxSTREAM_WRITE_ERROR;
 }
 
 wxZlibOutputStream::~wxZlibOutputStream()
 {
-  int err;
-
-  Sync();
-
-  err = deflate(m_deflate, Z_FINISH);
-  if (err != Z_STREAM_END) 
-  {
-    wxLogDebug( wxT("wxZlibOutputStream: an error occured while closing the stream.\n") );
-    return;
-  }
-
+  if (m_deflate && m_z_buffer)
+    DoFlush(true);
   deflateEnd(m_deflate);
   delete m_deflate;
 
   delete[] m_z_buffer;
 }
 
-void wxZlibOutputStream::Sync()
+void wxZlibOutputStream::DoFlush(bool final)
 {
-  int err;
-
-  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;
+  wxASSERT_MSG(m_deflate && m_z_buffer, wxT("Deflate stream not open"));
 
-  err = deflate(m_deflate, Z_FULL_FLUSH);
-  if (err != Z_OK) {
+  if (!m_deflate || !m_z_buffer)
+    m_lasterror = wxSTREAM_WRITE_ERROR;
+  if (!IsOk())
     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)
 {
-  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;
 
-  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_parent_o_stream->LastError() != wxStream_NOERROR)
-        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);
-    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\n"), msg.c_str());
+  }
+
+  size -= m_deflate->avail_in;
+  m_pos += size;
   return size;
 }