1 #include "trace_file.hpp"
11 using namespace Trace;
13 File::File(const std::string &filename,
15 : m_filename(filename),
19 if (!m_filename.empty()) {
20 open(m_filename, m_mode);
30 bool File::isOpened() const
35 File::Mode File::mode() const
40 std::string File::filename() const
45 bool File::open(const std::string &filename, File::Mode mode)
50 m_isOpened = rawOpen(filename, mode);
55 bool File::write(const void *buffer, int length)
57 if (!m_isOpened || m_mode != File::Write) {
60 return rawWrite(buffer, length);
63 bool File::read(void *buffer, int length)
65 if (!m_isOpened || m_mode != File::Read) {
68 return rawRead(buffer, length);
86 if (!m_isOpened || m_mode != File::Read) {
92 ZLibFile::ZLibFile(const std::string &filename,
94 : File(filename, mode),
103 bool ZLibFile::rawOpen(const std::string &filename, File::Mode mode)
105 m_gzFile = gzopen(filename.c_str(),
106 (mode == File::Write) ? "wb" : "rb");
107 return m_gzFile != NULL;
110 bool ZLibFile::rawWrite(const void *buffer, int length)
112 return gzwrite(m_gzFile, buffer, length) != -1;
115 bool ZLibFile::rawRead(void *buffer, int length)
117 return gzread(m_gzFile, buffer, length) != -1;
120 int ZLibFile::rawGetc()
122 return gzgetc(m_gzFile);
125 void ZLibFile::rawClose()
133 void ZLibFile::rawFlush()
135 gzflush(m_gzFile, Z_SYNC_FLUSH);
138 SnappyFile::SnappyFile(const std::string &filename,
145 m_compressedCache = new char[SNAPPY_CHUNK_SIZE];
148 SnappyFile::~SnappyFile()
150 delete [] m_compressedCache;
153 bool SnappyFile::rawOpen(const std::string &filename, File::Mode mode)
155 std::ios_base::openmode fmode = std::fstream::binary;
156 if (mode == File::Write) {
157 fmode |= (std::fstream::out | std::fstream::trunc);
158 createCache(SNAPPY_CHUNK_SIZE);
159 } else if (mode == File::Read) {
160 fmode |= std::fstream::in;
163 m_stream.open(filename.c_str(), fmode);
165 //read in the initial buffer if we're reading
166 if (m_stream.is_open() && mode == File::Read) {
169 return m_stream.is_open();
172 bool SnappyFile::rawWrite(const void *buffer, int length)
174 if (freeCacheSize() > length) {
175 memcpy(m_cachePtr, buffer, length);
176 m_cachePtr += length;
177 } else if (freeCacheSize() == length) {
178 memcpy(m_cachePtr, buffer, length);
179 m_cachePtr += length;
182 int sizeToWrite = length;
184 while (sizeToWrite >= freeCacheSize()) {
185 int endSize = freeCacheSize();
186 int offset = length - sizeToWrite;
187 memcpy(m_cachePtr, (char*)buffer + offset, endSize);
188 sizeToWrite -= endSize;
189 m_cachePtr += endSize;
193 int offset = length - sizeToWrite;
194 memcpy(m_cachePtr, (char*)buffer + offset, sizeToWrite);
195 m_cachePtr += sizeToWrite;
202 bool SnappyFile::rawRead(void *buffer, int length)
204 if (m_stream.eof()) {
207 if (freeCacheSize() > length) {
208 memcpy(buffer, m_cachePtr, length);
209 m_cachePtr += length;
210 } else if (freeCacheSize() == length) {
211 memcpy(buffer, m_cachePtr, length);
212 m_cachePtr += length;
215 int sizeToRead = length;
218 int chunkSize = std::min(freeCacheSize(), sizeToRead);
219 offset = length - sizeToRead;
220 memcpy((char*)buffer + offset, m_cachePtr, chunkSize);
221 m_cachePtr += chunkSize;
222 sizeToRead -= chunkSize;
231 int SnappyFile::rawGetc()
239 void SnappyFile::rawClose()
248 void SnappyFile::rawFlush()
253 void SnappyFile::flushCache()
255 if (m_mode == File::Write) {
256 size_t compressedLength;
258 ::snappy::RawCompress(m_cache, SNAPPY_CHUNK_SIZE - freeCacheSize(),
259 m_compressedCache, &compressedLength);
261 m_stream << compressedLength;
262 m_stream.write(m_compressedCache, compressedLength);
263 m_cachePtr = m_cache;
264 } else if (m_mode == File::Read) {
267 //assert(m_cachePtr == m_cache + m_cacheSize);
268 size_t compressedLength;
269 m_stream >> compressedLength;
270 m_stream.read((char*)m_compressedCache, compressedLength);
271 ::snappy::GetUncompressedLength(m_compressedCache, compressedLength,
275 createCache(m_cacheSize);
276 ::snappy::RawUncompress(m_compressedCache, compressedLength,
281 void SnappyFile::createCache(size_t size)
283 m_cache = new char[size];
284 m_cachePtr = m_cache;