X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/45805ba32255e4115b2ddddc15a5db5720ecb7ba..4c420a80e0fb11511b235411875ba5d3e0eb8492:/src/common/zstream.cpp?ds=sidebyside diff --git a/src/common/zstream.cpp b/src/common/zstream.cpp index 29a7dfa23b..7309afc292 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 @@ -33,40 +33,71 @@ // 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" -#elif defined(__WXMAC__) && defined(__UNIX__) - #include #else - #include + #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(wxInputStream& stream) +wxZlibInputStream::wxZlibInputStream(wxInputStream& stream, int flags) : 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; - m_inflate->avail_in = 0; - m_inflate->next_in = NULL; + if (m_inflate) { + memset(m_inflate, 0, sizeof(z_stream_s)); + + // 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() @@ -79,146 +110,222 @@ 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) { - 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(); + } + err = inflate(m_inflate, Z_SYNC_FLUSH); + } - 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 ) - { - // EOF - m_lasterror = wxStream_EOF; - break; + 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; } - } - err = inflate(m_inflate, Z_FINISH); - if (err == Z_STREAM_END) - return (size - m_inflate->avail_out); + 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; + 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(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; + m_deflate = NULL; + m_z_buffer = new unsigned char[ZSTREAM_BUFFER_SIZE]; + m_z_size = ZSTREAM_BUFFER_SIZE; + m_pos = 0; - if (level == -1) level = Z_DEFAULT_COMPRESSION; - wxASSERT_MSG(level >= 0 && level <= 9, wxT("wxZlibOutputStream compression level must be between 0 and 9!")); + if ( level == -1 ) + { + level = Z_DEFAULT_COMPRESSION; + } + 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; } - 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; + } } + wxLogError(_("Can't initialize zlib deflate stream.")); + m_lasterror = wxSTREAM_WRITE_ERROR; +} + +wxZlibOutputStream::~wxZlibOutputStream() +{ + 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" - 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; + + 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; + } - 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; + 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"), msg.c_str()); + } + + size -= m_deflate->avail_in; + m_pos += size; return size; } +/* static */ bool wxZlibOutputStream::CanHandleGZip() +{ + return wxZlibInputStream::CanHandleGZip(); +} + #endif // wxUSE_ZLIB && wxUSE_STREAMS - +