4 #include "zlibcompressed.h"
11 zlib_error::zlib_error(const std::string &w, int c):
13 runtime_error(w+": "+zError(c)),
21 struct ZlibCompressed::Private
30 ZlibCompressed::Private::Private()
40 ZlibCompressed::ZlibCompressed(Base &b, unsigned level):
43 mode = below.get_mode()&M_RDWR;
44 if(mode!=M_READ && mode!=M_WRITE)
45 throw invalid_access(mode);
50 ZlibCompressed::ZlibCompressed(Base &b, Mode m, unsigned level):
53 mode = m&below.get_mode()&M_RDWR;
54 if(mode!=M_READ && mode!=M_WRITE)
55 throw invalid_access(m);
60 void ZlibCompressed::init(unsigned level)
71 int ret = deflateInit(&priv->stream, level);
73 throw zlib_error("deflateInit", ret);
77 int ret = inflateInit(&priv->stream);
79 throw zlib_error("inflateInit", ret);
82 in_buffer = new unsigned char[buffer_size];
83 out_buffer = new unsigned char[buffer_size];
85 priv->stream.next_in = in_buffer;
86 priv->stream.avail_in = 0;
87 priv->stream.next_out = out_buffer;
88 priv->stream.avail_out = buffer_size;
90 below.signal_flush_required.connect(sigc::mem_fun(this, &ZlibCompressed::flush));
93 throw zlib_error("unsupported", -1);
97 ZlibCompressed::~ZlibCompressed()
102 while(compress_data(Z_FINISH)) ;
103 deflateEnd(&priv->stream);
106 inflateEnd(&priv->stream);
114 void ZlibCompressed::flush()
121 if(!compress_data(Z_SYNC_FLUSH))
124 // The flush is done when all input data has been consumed
125 if(!priv->stream.avail_in)
132 unsigned ZlibCompressed::do_write(const char *data, unsigned size)
134 check_access(M_WRITE);
136 unsigned processed = 0;
138 while(processed<size)
140 unsigned free_in = (in_buffer+buffer_size-priv->stream.next_in);
141 if(free_in<size && priv->stream.next_in>in_buffer)
143 // Not all of the data fits in the buffer, so make some more room
144 copy(priv->stream.next_in, priv->stream.next_in+priv->stream.avail_in, in_buffer);
145 priv->stream.next_in = in_buffer;
146 free_in = buffer_size-priv->stream.avail_in;
151 // Copy as much data into the input buffer as possible
152 unsigned len = min(free_in, size-processed);
153 copy(data+processed, data+processed+len, priv->stream.next_in+priv->stream.avail_in);
154 priv->stream.avail_in += len;
158 bool stalled = false;
159 while(priv->stream.avail_in && !stalled)
160 stalled = !compress_data(Z_NO_FLUSH);
172 bool ZlibCompressed::compress_data(int flush_mode)
175 bool can_deflate = ((priv->stream.avail_in || flush_mode) && priv->stream.avail_out);
176 bool finished = false;
179 int ret = deflate(&priv->stream, flush_mode);
180 if(flush_mode==Z_FINISH && ret==Z_STREAM_END)
183 throw zlib_error("deflate", ret);
186 // Write compressed data into the underlying object
188 if(priv->stream.next_out>out_buffer)
189 len = below.write(reinterpret_cast<char *>(out_buffer), priv->stream.next_out-out_buffer);
192 if(len<static_cast<unsigned>(priv->stream.next_out-out_buffer))
193 copy(out_buffer+len, priv->stream.next_out, out_buffer);
194 priv->stream.avail_out += len;
195 priv->stream.next_out -= len;
197 else if(!can_deflate)
198 // We weren't able to do anything
208 unsigned ZlibCompressed::do_read(char *data, unsigned size)
210 check_access(M_READ);
212 unsigned processed = 0;
214 while(processed<size)
216 if(priv->stream.next_out>out_buffer)
218 // We have some pending output, give it out first
219 unsigned len = min<unsigned>(priv->stream.next_out-out_buffer, size-processed);
221 copy(out_buffer, out_buffer+len, data+processed);
224 if(len<static_cast<unsigned>(priv->stream.next_out-out_buffer))
225 copy(out_buffer+len, priv->stream.next_out, out_buffer);
226 priv->stream.next_out -= len;
227 priv->stream.avail_out += len;
232 bool need_more_input = !priv->stream.avail_in;
233 if(priv->stream.avail_in)
235 int ret = inflate(&priv->stream, Z_NO_FLUSH);
236 if(ret==Z_STREAM_END)
239 throw zlib_error("inflate", ret);
240 need_more_input = (priv->stream.next_out==out_buffer);
248 if(priv->stream.next_in>in_buffer)
249 copy(priv->stream.next_in, priv->stream.next_in+priv->stream.avail_in, in_buffer);
250 priv->stream.next_in = in_buffer;
252 unsigned len = below.read(reinterpret_cast<char *>(priv->stream.next_in), in_buffer+buffer_size-priv->stream.next_in);
253 priv->stream.avail_in += len;
254 if(!len && below.eof())
259 if(size>0 && processed==0 && stream_end)