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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2020-02-25 09:13:39 +0100
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2020-02-27 01:05:42 +0100
commit3c1a4c2548cbbae96f44469278b53046c8b48868 (patch)
treecf528c5338f850012744e3376eae502767bfdc21 /lib/sqfs/comp/zstd.c
parentc9429aeece3b8642de637f7a21e68046bd690658 (diff)
Add a function to the compressor interface to get the configuration
This allows getting the compressor configuration back after creating it, for various purposes. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'lib/sqfs/comp/zstd.c')
-rw-r--r--lib/sqfs/comp/zstd.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/lib/sqfs/comp/zstd.c b/lib/sqfs/comp/zstd.c
index 4bd9456..e01f87d 100644
--- a/lib/sqfs/comp/zstd.c
+++ b/lib/sqfs/comp/zstd.c
@@ -18,6 +18,7 @@
typedef struct {
sqfs_compressor_t base;
+ size_t block_size;
ZSTD_CCtx *zctx;
int level;
} zstd_compressor_t;
@@ -91,6 +92,21 @@ static sqfs_s32 zstd_uncomp_block(sqfs_compressor_t *base, const sqfs_u8 *in,
return ret;
}
+static void zstd_get_configuration(const sqfs_compressor_t *base,
+ sqfs_compressor_config_t *cfg)
+{
+ const zstd_compressor_t *zstd = (const zstd_compressor_t *)base;
+
+ memset(cfg, 0, sizeof(*cfg));
+ cfg->id = SQFS_COMP_ZSTD;
+
+ cfg->block_size = zstd->block_size;
+ cfg->opt.zstd.level = zstd->level;
+
+ if (base->do_block == zstd_uncomp_block)
+ cfg->flags |= SQFS_COMP_FLAG_UNCOMPRESS;
+}
+
static sqfs_compressor_t *zstd_create_copy(sqfs_compressor_t *cmp)
{
zstd_compressor_t *zstd = malloc(sizeof(*zstd));
@@ -136,12 +152,14 @@ sqfs_compressor_t *zstd_compressor_create(const sqfs_compressor_config_t *cfg)
if (zstd == NULL)
return NULL;
+ zstd->block_size = cfg->block_size;
zstd->zctx = ZSTD_createCCtx();
if (zstd->zctx == NULL) {
free(zstd);
return NULL;
}
+ base->get_configuration = zstd_get_configuration;
base->do_block = cfg->flags & SQFS_COMP_FLAG_UNCOMPRESS ?
zstd_uncomp_block : zstd_comp_block;
base->write_options = zstd_write_options;