1 files changed, 55 insertions, 0 deletions
diff --git a/sample/zread.c b/sample/zread.c
new file mode 100644
index 0000000..e20de49
--- /dev/null
+++ b/sample/zread.c
@@ -0,0 +1,55 @@
+#include <config.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+/* Trivial example of reading a gzip'ed file or gzip'ed standard input
+ * using stdio functions fread(), getc(), etc... fseek() is not supported.
+ * Modify according to your needs. You can easily construct the symmetric
+ * zwrite program.
+ *
+ * Usage: zread [file[.gz]]
+ * This programs assumes that gzip is somewhere in your path.
+ */
+int main(argc, argv)
+    int argc;
+    char **argv;
+{
+    FILE *infile;
+    char cmd[256];
+    char buf[BUFSIZ];
+    int n;
+
+    if (argc < 1 || argc > 2) {
+        fprintf(stderr, "usage: %s [file[.gz]]\n", argv[0]);
+        exit(EXIT_FAILURE);
+    }
+    strcpy(cmd, "gzip -dc ");  /* use "gzip -c" for zwrite */
+    if (argc == 2) {
+        strncat(cmd, argv[1], sizeof(cmd)-strlen(cmd));
+    }
+    infile = popen(cmd, "r");  /* use "w" for zwrite */
+    if (infile == NULL) {
+        fprintf(stderr, "%s: popen('%s', 'r') failed\n", argv[0], cmd);
+        exit(EXIT_FAILURE);
+    }
+    /* Read one byte using getc: */
+    n = getc(infile);
+    if (n == EOF) {
+        pclose(infile);
+        exit(EXIT_SUCCESS);
+    }
+    putchar(n);
+
+    /* Read the rest using fread: */
+    for (;;) {
+        n = fread(buf, 1, BUFSIZ, infile);
+        if (n <= 0) break;
+        fwrite(buf, 1, n, stdout);
+    }
+    if (pclose(infile) != 0) {
+        fprintf(stderr, "%s: pclose failed\n", argv[0]);
+        exit(EXIT_FAILURE);
+    }
+    exit(EXIT_SUCCESS);
+    return 0; /* just to make compiler happy */
+}