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));
95 throw zlib_error("unsupported", -1);
99 ZlibCompressed::~ZlibCompressed()
104 while(compress_data(Z_FINISH)) ;
105 deflateEnd(&priv->stream);
108 inflateEnd(&priv->stream);
116 void ZlibCompressed::flush()
123 if(!compress_data(Z_SYNC_FLUSH))
126 // The flush is done when all input data has been consumed
127 if(!priv->stream.avail_in)
134 unsigned ZlibCompressed::do_write(const char *data, unsigned size)
136 check_access(M_WRITE);
138 unsigned processed = 0;
140 while(processed<size)
142 unsigned free_in = (in_buffer+buffer_size-priv->stream.next_in);
143 if(free_in<size && priv->stream.next_in>in_buffer)
145 // Not all of the data fits in the buffer, so make some more room
146 copy(priv->stream.next_in, priv->stream.next_in+priv->stream.avail_in, in_buffer);
147 priv->stream.next_in = in_buffer;
148 free_in = buffer_size-priv->stream.avail_in;
153 // Copy as much data into the input buffer as possible
154 unsigned len = min(free_in, size-processed);
155 copy(data+processed, data+processed+len, priv->stream.next_in+priv->stream.avail_in);
156 priv->stream.avail_in += len;
160 bool stalled = false;
161 while(priv->stream.avail_in && !stalled)
162 stalled = !compress_data(Z_NO_FLUSH);
174 bool ZlibCompressed::compress_data(int flush_mode)
177 bool can_deflate = ((priv->stream.avail_in || flush_mode) && priv->stream.avail_out);
178 bool finished = false;
181 int ret = deflate(&priv->stream, flush_mode);
182 if(flush_mode==Z_FINISH && ret==Z_STREAM_END)
185 throw zlib_error("deflate", ret);
188 // Write compressed data into the underlying object
190 if(priv->stream.next_out>out_buffer)
191 len = below.write(reinterpret_cast<char *>(out_buffer), priv->stream.next_out-out_buffer);
194 if(len<static_cast<unsigned>(priv->stream.next_out-out_buffer))
195 copy(out_buffer+len, priv->stream.next_out, out_buffer);
196 priv->stream.avail_out += len;
197 priv->stream.next_out -= len;
199 else if(!can_deflate)
200 // We weren't able to do anything
210 unsigned ZlibCompressed::do_read(char *data, unsigned size)
212 check_access(M_READ);
214 unsigned processed = 0;
216 while(processed<size)
218 if(priv->stream.next_out>out_buffer)
220 // We have some pending output, give it out first
221 unsigned len = min<unsigned>(priv->stream.next_out-out_buffer, size-processed);
223 copy(out_buffer, out_buffer+len, data+processed);
226 if(len<static_cast<unsigned>(priv->stream.next_out-out_buffer))
227 copy(out_buffer+len, priv->stream.next_out, out_buffer);
228 priv->stream.next_out -= len;
229 priv->stream.avail_out += len;
234 bool need_more_input = !priv->stream.avail_in;
235 if(priv->stream.avail_in)
237 int ret = inflate(&priv->stream, Z_NO_FLUSH);
238 if(ret==Z_STREAM_END)
241 throw zlib_error("inflate", ret);
242 need_more_input = (priv->stream.next_out==out_buffer);
250 if(priv->stream.next_in>in_buffer)
251 copy(priv->stream.next_in, priv->stream.next_in+priv->stream.avail_in, in_buffer);
252 priv->stream.next_in = in_buffer;
254 unsigned len = below.read(reinterpret_cast<char *>(priv->stream.next_in), in_buffer+buffer_size-priv->stream.next_in);
255 priv->stream.avail_in += len;
256 if(!len && below.eof())
261 if(size>0 && processed==0 && stream_end)