X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/e3e65dac0c4e7ad19e3c270caa1e0eea138e5d8d..6012f61212b67d510e4a6393272e867a4ceb58c1:/src/common/zstream.cpp diff --git a/src/common/zstream.cpp b/src/common/zstream.cpp index dc4596f837..55589614a5 100644 --- a/src/common/zstream.cpp +++ b/src/common/zstream.cpp @@ -1,192 +1,337 @@ -///////////////////////////////////////////////////////////////////////////// -// Name: zstream.cpp +////////////////////////////////////////////////////////////////////////////// +// Name: src/common/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__ -#pragma implementation "zstream.h" -#endif // For compilers that support precompilation, includes "wx.h". #include "wx/wxprec.h" -#include -#include -#include -#include "../zlib/zlib.h" // don't change this, Robert #ifdef __BORLANDC__ -#pragma hdrstop + #pragma hdrstop +#endif + +#if wxUSE_ZLIB && wxUSE_STREAMS + +#include "wx/zstream.h" + +#ifndef WX_PRECOMP + #include "wx/intl.h" + #include "wx/log.h" + #include "wx/utils.h" #endif -#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, + 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) { - int err; - - // I need a private stream buffer. - m_i_streambuf = new wxStreamBuffer(*this); - m_i_destroybuf = TRUE; + 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 compatibility mode as auto + m_24compatibilty = flags == wxZLIB_24COMPATIBLE; + if (m_24compatibilty) + flags = wxZLIB_AUTO; +#endif - err = inflateInit(&m_inflate); - if (err != Z_OK) { - inflateEnd(&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() { - inflateEnd(&m_inflate); + inflateEnd(m_inflate); + delete m_inflate; + + delete [] m_z_buffer; } -size_t wxZlibInputStream::DoRead(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")); - m_inflate.next_out = (unsigned char *)buffer; - m_inflate.avail_out = size; + if (!m_inflate || !m_z_buffer) + m_lasterror = wxSTREAM_READ_ERROR; + if (!IsOk() || !size) + return 0; - while (m_inflate.avail_out > 0) { - if (m_inflate.avail_in == 0) { + int err = Z_OK; + m_inflate->next_out = (unsigned char *)buffer; + m_inflate->avail_out = 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); + } + switch (err) { + case Z_OK: + break; + + case Z_STREAM_END: + if (m_inflate->avail_out) { + // 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->Reset(); + m_parent_i_stream->Ungetch(m_inflate->next_in, m_inflate->avail_in); + m_inflate->avail_in = 0; + } + 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()) - return (size - m_inflate.avail_in); - } - err = inflate(&m_inflate, Z_FINISH); - if (err == Z_STREAM_END) - return (size - m_inflate.avail_in); +#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 = wxString::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_in; + size -= m_inflate->avail_out; + m_pos += size; + return size; } -bool wxZlibInputStream::Eof() const +/* static */ bool wxZlibInputStream::CanHandleGZip() { - if (!m_eof) - return m_parent_i_stream->Eof(); - return m_eof; + 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) +wxZlibOutputStream::wxZlibOutputStream(wxOutputStream& stream, + int level, + int flags) : wxFilterOutputStream(stream) { - int err; - - m_o_streambuf = new wxStreamBuffer(*this); - m_o_destroybuf = TRUE; + m_deflate = NULL; + m_z_buffer = new unsigned char[ZSTREAM_BUFFER_SIZE]; + m_z_size = ZSTREAM_BUFFER_SIZE; + m_pos = 0; - m_deflate.zalloc = (alloc_func)0; - m_deflate.zfree = (free_func)0; - m_deflate.opaque = (voidpf)0; + 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, Z_DEFAULT_COMPRESSION); - 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; + 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; + + // 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; + } + } - 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; +bool wxZlibOutputStream::Close() + { + DoFlush(true); + deflateEnd(m_deflate); + delete m_deflate; - Sync(); + m_deflate = NULL; + delete[] m_z_buffer; + m_z_buffer = NULL; + return IsOk(); + } - err = deflate(&m_deflate, Z_FINISH); - if (err != Z_STREAM_END) { - wxDebugMsg("wxZlibOutputStream: an error occured while we was closing " - "the stream.\n"); +void wxZlibOutputStream::DoFlush(bool final) +{ + if (!m_deflate || !m_z_buffer) + m_lasterror = wxSTREAM_WRITE_ERROR; + if (!IsOk()) return; - } - deflateEnd(&m_deflate); + 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; + } - delete[] m_z_buffer; + if (done) + break; + err = deflate(m_deflate, final ? Z_FINISH : Z_FULL_FLUSH); + done = m_deflate->avail_out != 0 || err == Z_STREAM_END; + } } -void wxZlibOutputStream::Sync() +size_t wxZlibOutputStream::OnSysWrite(const void *buffer, size_t size) { - 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) { - m_bad = TRUE; - return; + if (!m_deflate || !m_z_buffer) + { + // notice that this will make IsOk() test just below return false + m_lasterror = wxSTREAM_WRITE_ERROR; } - 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; -} - -size_t wxZlibOutputStream::DoWrite(const void *buffer, size_t size) -{ - int err; - - m_deflate.next_in = (unsigned char *)buffer; - m_deflate.avail_in = size; + if (!IsOk() || !size) + return 0; - while (m_deflate.avail_in > 0) { + int err = Z_OK; + m_deflate->next_in = (unsigned char *)buffer; + m_deflate->avail_in = size; - if (m_deflate.avail_out == 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->Bad()) - return (size - m_deflate.avail_in); - - m_deflate.next_out = m_z_buffer; - m_deflate.avail_out = m_z_size; + 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); + err = deflate(m_deflate, Z_NO_FLUSH); + } + + if (err != Z_OK) { + m_lasterror = wxSTREAM_WRITE_ERROR; + wxString msg(m_deflate->msg, *wxConvCurrent); + if (!msg) + msg = wxString::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; } -bool wxZlibOutputStream::Bad() const +/* static */ bool wxZlibOutputStream::CanHandleGZip() { - if (!m_bad) - return m_parent_o_stream->Bad(); - return m_bad; + return wxZlibInputStream::CanHandleGZip(); } + +#endif + // wxUSE_ZLIB && wxUSE_STREAMS