summaryrefslogtreecommitdiff
path: root/lib/comp/gzip.c
diff options
context:
space:
mode:
authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-08-12 18:25:52 +0200
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-08-16 16:47:24 +0200
commit2f22a35e843a24f0ad5f31644133d64648fe4efc (patch)
tree7175b11355ea988c022d7e87b27f6676c5d2d181 /lib/comp/gzip.c
parent008990af4d8b0cfa03fcb2c5fa2ba461dad71b18 (diff)
Add deep-copy function to compressor interface
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'lib/comp/gzip.c')
-rw-r--r--lib/comp/gzip.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/lib/comp/gzip.c b/lib/comp/gzip.c
index 1068520..1fdc051 100644
--- a/lib/comp/gzip.c
+++ b/lib/comp/gzip.c
@@ -308,6 +308,36 @@ fail_value:
return -1;
}
+static compressor_t *gzip_create_copy(compressor_t *cmp)
+{
+ gzip_compressor_t *gzip = malloc(sizeof(*gzip));
+ int ret;
+
+ if (gzip == NULL) {
+ perror("creating additional gzip compressor");
+ return NULL;
+ }
+
+ memcpy(gzip, cmp, sizeof(*gzip));
+ memset(&gzip->strm, 0, sizeof(gzip->strm));
+
+ if (gzip->compress) {
+ ret = deflateInit2(&gzip->strm, gzip->opt.level, Z_DEFLATED,
+ gzip->opt.window, 8, Z_DEFAULT_STRATEGY);
+ } else {
+ ret = inflateInit(&gzip->strm);
+ }
+
+ if (ret != Z_OK) {
+ fputs("internal error creating additional zlib stream\n",
+ stderr);
+ free(gzip);
+ return NULL;
+ }
+
+ return (compressor_t *)gzip;
+}
+
compressor_t *create_gzip_compressor(bool compress, size_t block_size,
char *options)
{
@@ -340,6 +370,7 @@ compressor_t *create_gzip_compressor(bool compress, size_t block_size,
base->destroy = gzip_destroy;
base->write_options = gzip_write_options;
base->read_options = gzip_read_options;
+ base->create_copy = gzip_create_copy;
if (compress) {
ret = deflateInit2(&gzip->strm, level, Z_DEFLATED, window, 8,