diff options
Diffstat (limited to 'kexec/zlib.c')
| -rw-r--r-- | kexec/zlib.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/kexec/zlib.c b/kexec/zlib.c index 95b60805..9bc340d8 100644 --- a/kexec/zlib.c +++ b/kexec/zlib.c @@ -23,6 +23,38 @@ static void _gzerror(gzFile fp, int *errnum, const char **errmsg) } } +int is_zlib_file(const char *filename, off_t *r_size) +{ + gzFile fp; + int errnum; + int is_zlib_file = 0; /* default: It's not in gzip format */ + const char *msg; + ssize_t result; + + if (!filename) + goto out; + + fp = gzopen(filename, "rb"); + if (fp == 0) { + _gzerror(fp, &errnum, &msg); + dbgprintf("Cannot open `%s': %s\n", filename, msg); + goto out; + } + + if (!gzdirect(fp)) + /* It's in gzip format */ + is_zlib_file = 1; + + result = gzclose(fp); + if (result != Z_OK) { + _gzerror(fp, &errnum, &msg); + dbgprintf(" Close of %s failed: %s\n", filename, msg); + } + +out: + return is_zlib_file; +} + char *zlib_decompress_file(const char *filename, off_t *r_size) { gzFile fp; @@ -84,6 +116,12 @@ fail: return buf; } #else + +int is_zlib_file(const char *filename, off_t *r_size) +{ + return 0; +} + char *zlib_decompress_file(const char *UNUSED(filename), off_t *UNUSED(r_size)) { return NULL; |