Changes between Version 11 and Version 12 of FileCompression

Timestamp:

Nov 22, 2010, 9:31:51 PM (14 years ago)

Author:

carlgt1

Comment:

added some boinc_zip updates, new svn location, gzip stuff

FileCompression

@@ -133 +133 @@
 boinc_zip, based on the [http://www.info-zip.org Info-Zip] libraries, but combines both zip & unzip
 functionality in one library.
-Any questions/comments please email Carl Christensen.
+Any questions/comments please email Carl Christensen  mailto:carlgt1@yahoo.com]
 
 This library can "co-exist" with zlib (libz) in case you need that too.
@@ -219 +219 @@
 with how `boinc_zip` work (just g++ with the `boinc/lib/filesys.C` & `util.C` as
 described above).
+
+=== Getting boinc_zip ===
+
+boinc_zip is no longer in the main boinc subversion "trunk" but resides in this "depends" brance:
+
+svn co http://boinc.berkeley.edu/svn/trunk/depends_projects/zip
+
+Note for Linux/Mac:  To build along with the other boinc libraries, you will need to add the following lines to the bottom of the '''configure.ac''' file (where the various Makefiles are listed):
+
+{{{
+     zip/Makefile
+     zip/zip/Makefile
+     zip/unzip/Makefile
+}}}
+
+
+Similarly for the '''Makefile.am''' file -- add zip, zip/zip and zip/unzip to the library subdirs:
+
+{{{
+if ENABLE_LIBRARIES
+   API_SUBDIRS = api lib zip zip/zip zip/unzip
+endif
+}}}
+
+== Client and Server Compression and Decompression using gzip (zlib) == #gzip
+
+These basic routines may be useful if you want to compress/decompress a file using the zlib library (usually called "libz.a" and available for most platforms).  Include the header file below (qcn_gzip.h) in your program, and link against libz, and you will gain two simple to use functions for gzip'ing or gunzip'ing a file.  This is for simple single file or file-by-file compression or decompression (i.e. one file that is to be compressed into a .gz or decompressed back to it's original uncompressed state).  You can check for boinc client status if you want the ability to quit inside an operation etc.
+
+qcn_gzip.h:
+
+{{{
+#ifndef _QCN_GZIP_H_
+#define _QCN_GZIP_H_
+
+#include <zlib.h>
+
+int do_gzip(const char* strGZ, const char* strInput);
+int do_gunzip(const char* strGZ, const char* strInput, bool bKeep = false);
+
+#endif
+}}}
+
+
+qcn_gzip.cpp:
+
+{{{
+#include <stdio.h>
+#include "filesys.h"
+#include "qcn_gzip.h"
+
+int do_gzip(const char* strGZ, const char* strInput)
+{
+        // take an input file (strInput) and turn it into a compressed file (strGZ)
+        // get rid of the input file after
+        FILE* fIn = boinc_fopen(strInput, "rb");
+        if (!fIn)  return 1; //error
+        gzFile fOut = gzopen(strGZ, "wb");
+        if (!fOut) return 1; //error
+        fseek(fIn, 0, SEEK_SET);  // go to the top of the files
+        gzseek(fOut, 0, SEEK_SET);
+        unsigned char buf[1024];
+        long lRead = 0, lWrite = 0;
+        while (!feof(fIn)) { // read 1KB at a time until end of file
+                memset(buf, 0x00, 1024);
+                lRead = 0;
+                lRead = (long) fread(buf, 1, 1024, fIn);
+                lWrite = (long) gzwrite(fOut, buf, lRead);
+                if (lRead != lWrite) break;
+        }
+        gzclose(fOut);
+        fclose(fIn);
+        if (lRead != lWrite) return 1;  //error -- read bytes != written bytes
+        // if we made it here, it compressed OK, can erase strInput and leave
+        boinc_delete_file(strInput);
+        return 0;
+}
+
+// CMC - commented out status calls, are they too paranoid?
+//      if needed use sm->statusBOINC instead (for quit_request etc)
+
+int do_gunzip(const char* strGZ, const char* strInput, bool bKeep)
+{
+        // take an input file (strInput) and turn it into a compressed file (strGZ)
+        // get rid of the input file after
+        //s.quit_request = 0;
+        //checkBOINCStatus();
+        FILE* fIn = boinc_fopen(strInput, "wb");
+        if (!fIn)  return 1; //error
+        gzFile fOut = gzopen(strGZ, "rb");
+        if (!fOut) return 1; //error
+        fseek(fIn, 0, SEEK_SET);  // go to the top of the files
+        gzseek(fOut, 0, SEEK_SET);
+        unsigned char buf[1024];
+        long lRead = 0, lWrite = 0;
+        while (!gzeof(fOut)) { // read 1KB at a time until end of file
+                memset(buf, 0x00, 1024);
+                lRead = 0;
+                lRead = (long) gzread(fOut,buf,1024);
+                lWrite = (long) fwrite(buf, 1, 1024, fIn);
+                if (lRead != lWrite) break;
+                //boinc_get_status(&s);
+                //if (s.quit_request || s.abort_request || s.no_heartbeat) break;
+        }
+        gzclose(fOut);
+        fclose(fIn);
+        //checkBOINCStatus();
+        if (lRead != lWrite) return 1;  //error -- read bytes != written bytes
+        // if we made it here, it compressed OK, can erase strInput and leave
+        if (!bKeep) boinc_delete_file(strGZ);
+        return 0;
+}
+
+}}}