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-rw-r--r--include/sqfs/compressor.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/include/sqfs/compressor.h b/include/sqfs/compressor.h
index 46bdf58..a53fbc1 100644
--- a/include/sqfs/compressor.h
+++ b/include/sqfs/compressor.h
@@ -100,6 +100,11 @@ struct sqfs_compressor_t {
* @struct sqfs_compressor_config_t
*
* @brief Configuration parameters for instantiating a compressor backend.
+ *
+ * The unused fields MUST be set to 0. The easiest way to do this is by always
+ * clearing the struct using memset before setting anything, or using
+ * @ref sqfs_compressor_config_init to set defaults and then modify the struct
+ * from there.
*/
struct sqfs_compressor_config_t {
/**
@@ -138,6 +143,8 @@ struct sqfs_compressor_config_t {
* Default is 15, i.e. 32k window.
*/
sqfs_u16 window_size;
+
+ sqfs_u32 padd0[3];
} gzip;
/**
@@ -150,6 +157,8 @@ struct sqfs_compressor_config_t {
* Default is 15.
*/
sqfs_u16 level;
+
+ sqfs_u16 padd0[7];
} zstd;
/**
@@ -174,6 +183,8 @@ struct sqfs_compressor_config_t {
* Defaults to 9, i.e. best compression.
*/
sqfs_u16 level;
+
+ sqfs_u32 padd0[3];
} lzo;
/**
@@ -190,7 +201,11 @@ struct sqfs_compressor_config_t {
* block size.
*/
sqfs_u32 dict_size;
+
+ sqfs_u32 padd0[3];
} xz;
+
+ sqfs_u64 padd0[2];
} opt;
};