X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/d78b3d64143f165857922e1e695ba4164d61869f..73fe67bd60b57f95dc63809f7843ed2a15928436:/src/common/zstream.cpp?ds=sidebyside diff --git a/src/common/zstream.cpp b/src/common/zstream.cpp index c917e493a4..6c1a0c423d 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 @@ -20,168 +20,260 @@ #pragma hdrstop #endif -#ifndef WX_PRECOMP - #include "wx/defs.h" -#endif - #if wxUSE_ZLIB && wxUSE_STREAMS #include "wx/zstream.h" #include "wx/utils.h" #include "wx/intl.h" #include "wx/log.h" -#include "../zlib/zlib.h" -#define ZSTREAM_BUFFER_SIZE 1024 +// normally, the compiler options should contain -I../zlib, but it is +// apparently not the case for all MSW makefiles and so, unless we use +// configure (which defines __WX_SETUP_H__) or it is explicitly overridden by +// the user (who can define wxUSE_ZLIB_H_IN_PATH), we hardcode the path here +#if defined(__WXMSW__) && !defined(__WX_SETUP_H__) && !defined(wxUSE_ZLIB_H_IN_PATH) + #include "../zlib/zlib.h" +#else + #include "zlib.h" +#endif + +enum { + ZSTREAM_BUFFER_SIZE = 16384 +}; ////////////////////// // wxZlibInputStream ////////////////////// -wxZlibInputStream::wxZlibInputStream(wxInputStream& stream) +wxZlibInputStream::wxZlibInputStream(wxInputStream& stream, int flags) : wxFilterInputStream(stream) { - int err; - - // 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; - - 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() { inflateEnd(m_inflate); delete m_inflate; + + delete [] m_z_buffer; } 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, 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) - return (size - m_inflate->avail_in); + 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_FINISH); - if (err == Z_STREAM_END) - return (size - m_inflate->avail_in); + err = inflate(m_inflate, Z_NO_FLUSH); } - return size-m_inflate->avail_in; + 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; + } + 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; + } + + size -= m_inflate->avail_out; + m_pos += size; + return size; } ////////////////////// // wxZlibOutputStream ////////////////////// -wxZlibOutputStream::wxZlibOutputStream(wxOutputStream& stream) +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; + 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, Z_DEFAULT_COMPRESSION); - 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( _T("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; - } - 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; + int err = Z_OK; + bool done = false; + + 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; }