compress: Fix return codes when calling invalid method

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

diff --git a/src/libpakfire/compress.c b/src/libpakfire/compress.c
index bea2095bfc063bff2bea4eb973b2e2ab5cfe935f..e24b125b691cede99e8f6358e1e1e645e0f15a8a 100644 (file)
--- a/src/libpakfire/compress.c
+++ b/src/libpakfire/compress.c
@@ -120,7 +120,7 @@ static ssize_t xz_read(void* data, char* buffer, size_t size) {
 
        // Do not read when mode is "w"
        if (cookie->mode == 'w')
-               return 0;
+               return -1;
 
        // Return nothing after we are done
        if (cookie->done)
@@ -179,7 +179,7 @@ static ssize_t xz_write(void* data, const char* buffer, size_t size) {
 
        // Do not write when mode is "r"
        if (cookie->mode == 'r')
-               return 0;
+               return -1;
 
        // Return nothing when there is no input
        if (size == 0)