X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/5fc01d1326a34223746546326a7f616df8bfa991..4c420a80e0fb11511b235411875ba5d3e0eb8492:/src/common/zstream.cpp diff --git a/src/common/zstream.cpp b/src/common/zstream.cpp index 5372d21481..7309afc292 100644 --- a/src/common/zstream.cpp +++ b/src/common/zstream.cpp @@ -38,7 +38,9 @@ #endif enum { - ZSTREAM_BUFFER_SIZE = 16384 + ZSTREAM_BUFFER_SIZE = 16384, + ZSTREAM_GZIP = 0x10, // gzip header + ZSTREAM_AUTO = 0x20 // auto detect between gzip and zlib }; ////////////////////// @@ -53,25 +55,43 @@ wxZlibInputStream::wxZlibInputStream(wxInputStream& stream, int flags) m_z_size = ZSTREAM_BUFFER_SIZE; m_pos = 0; +#if WXWIN_COMPATIBILITY_2_4 + // treat compatibilty mode as auto + m_24compatibilty = flags == wxZLIB_24COMPATIBLE; + if (m_24compatibilty) + flags = wxZLIB_AUTO; +#endif + + // 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; + } + } + if (m_z_buffer) { m_inflate = new z_stream_s; if (m_inflate) { memset(m_inflate, 0, sizeof(z_stream_s)); - 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; + // 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, bits) == Z_OK) + if (inflateInit2(m_inflate, windowBits) == Z_OK) return; } } @@ -102,36 +122,49 @@ size_t wxZlibInputStream::OnSysRead(void *buffer, size_t size) m_inflate->avail_out = size; while (err == Z_OK && m_inflate->avail_out > 0) { - if (m_inflate->avail_in == 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_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; + 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_NO_FLUSH); - } + 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; - } - 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; + 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; } size -= m_inflate->avail_out; @@ -139,6 +172,15 @@ size_t wxZlibInputStream::OnSysRead(void *buffer, size_t 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 ////////////////////// @@ -162,24 +204,34 @@ wxZlibOutputStream::wxZlibOutputStream(wxOutputStream& stream, wxASSERT_MSG(level >= 0 && level <= 9, wxT("wxZlibOutputStream compression level must be between 0 and 9!")); } + // 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; + } + if (m_z_buffer) { - m_deflate = new z_stream_s; - - 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; - - 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 = new z_stream_s; + + 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; + + // 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")); + } + + if (deflateInit2(m_deflate, level, Z_DEFLATED, windowBits, + 8, Z_DEFAULT_STRATEGY) == Z_OK) + return; + } } wxLogError(_("Can't initialize zlib deflate stream.")); @@ -261,7 +313,7 @@ size_t wxZlibOutputStream::OnSysWrite(const void *buffer, size_t size) 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()); + wxLogError(_("Can't write to deflate stream: %s"), msg.c_str()); } size -= m_deflate->avail_in; @@ -269,6 +321,11 @@ size_t wxZlibOutputStream::OnSysWrite(const void *buffer, size_t size) return size; } +/* static */ bool wxZlibOutputStream::CanHandleGZip() +{ + return wxZlibInputStream::CanHandleGZip(); +} + #endif // wxUSE_ZLIB && wxUSE_STREAMS - +