Use compressed _master-pixmap.txt.gz

[ypp-sc-tools.main.git] / pctb / common.c

diff --git a/pctb/common.c b/pctb/common.c
index bc1cb8df749cb63ec2ef392300551c37262c6e16..2c2a085a30e9fdaa7ded64ffa7b10c82f31208ac 100644 (file)
--- a/pctb/common.c
+++ b/pctb/common.c
@@ -42,17 +42,68 @@ void *mrealloc(void *p, size_t sz) {
 
 
 FILE *dbfile;
-static const char *path;
+static const char *basepath; /* as passed in by caller */
+static pid_t dbzcat;
+
+int dbfile_gzopen(const char *basepath_spec) {
+  assert(!dbfile);
+
+  basepath= basepath_spec;
+  //uncomppath= masprintf("%s (uncompressed)", basepath);
+
+  char *zpath= masprintf("%s.gz", basepath);
+  int zfd= open(zpath, O_RDONLY);
+  free(zpath);
+
+  if (zfd<0) { sysassert(errno==ENOENT); return 0; }
+
+  int pipefds[2];
+  sysassert(! pipe(pipefds) );
+
+  sysassert( (dbzcat=fork()) != -1 );
+  if (!dbzcat) {
+    sysassert( dup2(zfd,0)==0 );
+    sysassert( dup2(pipefds[1],1)==1 );
+    sysassert(! close(zfd) );
+    sysassert(! close(pipefds[0]) );
+    sysassert(! close(pipefds[1]) );
+    execlp("zcat","zcat",(char*)0);
+    sysassert(!"execlp zcat");
+  }
+  sysassert(! close(zfd) );
+  sysassert(! close(pipefds[1]) );
+  sysassert( dbfile= fdopen(pipefds[0], "r") );
+
+  return 1;
+}  
 
 int dbfile_open(const char *tpath) {
   assert(!dbfile);
-  path= tpath;
-  dbfile= fopen(path,"r");
-  if (dbfile) return 1;
-  sysassert(errno==ENOENT);
-  return 0;
+
+  basepath= tpath;
+
+  dbzcat= -1;
+  dbfile= fopen(tpath,"r");
+  if (!dbfile) { sysassert(errno==ENOENT); return 0; }
+  return 1;
 }  
 
+void dbfile_close(void) {
+  if (!dbfile) return;
+
+  sysassert(!ferror(dbfile));
+  sysassert(!fclose(dbfile));
+
+  if (dbzcat != -1) {
+    char *zcatstr= masprintf("zcat %s.gz", basepath);
+    waitpid_check_exitstatus(dbzcat,zcatstr,1);
+    free(zcatstr);
+    dbzcat= -1;
+  }
+
+  dbfile= 0;
+}
+
 #define dbassertgl(x) ((x) ? (void)0 : dbfile_assertfail(file,line,#x))
 
 void dbfile_getsline(char *lbuf, size_t lbufsz, const char *file, int line) {
@@ -66,13 +117,6 @@ void dbfile_getsline(char *lbuf, size_t lbufsz, const char *file, int line) {
   lbuf[l]= 0;
 }
 
-void dbfile_close(void) {
-  if (!dbfile) return;
-  sysassert(!ferror(dbfile));
-  sysassert(!fclose(dbfile));
-  dbfile= 0;
-}
-
 int dbfile_vscanf(const char *fmt, va_list al) {
   int r= vfscanf(dbfile,fmt,al);
   sysassert(!ferror(dbfile));
@@ -88,11 +132,16 @@ int dbfile_scanf(const char *fmt, ...) {
 }
 
 void dbfile_assertfail(const char *file, int line, const char *m) {
-  if (dbfile)
+  if (dbzcat)
+    fatal("Error in dictionary file %s.gz:\n"
+         " Requirement not met at %s:%d:\n"
+         " %s",
+         basepath, file,line, m);
+  else if (dbfile)
     fatal("Error in dictionary file %s at byte %ld:\n"
          " Requirement not met at %s:%d:\n"
          " %s",
-         path,(long)ftell(dbfile), file,line, m);
+         basepath,(long)ftell(dbfile), file,line, m);
   else
     fatal("Semantic error in dictionaries:\n"
          " Requirement not met at %s:%d:\n"