Simplify unzip(), remove unused checks and unneccessary variables
diff --git a/archival/libunarchive/decompress_unzip.c b/archival/libunarchive/decompress_unzip.c
index c28ca83..a747bae 100644
--- a/archival/libunarchive/decompress_unzip.c
+++ b/archival/libunarchive/decompress_unzip.c
@@ -310,12 +310,8 @@
z = 1 << j; /* table entries for j-bit table */
/* allocate and link in new table */
- if ((q = (huft_t *) xmalloc((z + 1) * sizeof(huft_t))) == NULL) {
- if (h) {
- huft_free(u[0]);
- }
- return 3; /* not enough memory */
- }
+ q = (huft_t *) xmalloc((z + 1) * sizeof(huft_t));
+
hufts += z + 1; /* track memory usage */
*t = q + 1; /* link to list for huft_free() */
*(t = &(q->v.t)) = NULL;
@@ -858,6 +854,9 @@
bk = 0;
bb = 0;
+ /* Create the crc table */
+ make_crc_table();
+
/* decompress until the last block */
do {
hufts = 0;
@@ -894,16 +893,10 @@
*/
extern int unzip(FILE *l_in_file, FILE *l_out_file)
{
- const int extra_field = 0x04; /* bit 2 set: extra field present */
- const int orig_name = 0x08; /* bit 3 set: original file name present */
- const int comment = 0x10; /* bit 4 set: file comment present */
unsigned char buf[8]; /* extended local header */
unsigned char flags; /* compression flags */
- char magic[2]; /* magic header */
- int method;
typedef void (*sig_type) (int);
- int exit_code=0; /* program exit code */
- int i;
+ unsigned short i;
in_file = l_in_file;
out_file = l_out_file;
@@ -927,67 +920,49 @@
outcnt = 0;
bytes_out = 0L;
- magic[0] = fgetc(in_file);
- magic[1] = fgetc(in_file);
-
/* Magic header for gzip files, 1F 8B = \037\213 */
- if (memcmp(magic, "\037\213", 2) != 0) {
+ if ((fgetc(in_file) != 0x1F) || (fgetc(in_file) != 0x8b)) {
error_msg("Invalid gzip magic");
return EXIT_FAILURE;
}
- method = (int) fgetc(in_file);
- if (method != 8) {
- error_msg("unknown method %d -- get newer version of gzip", method);
- exit_code = 1;
- return -1;
+ /* Check the compression method */
+ if (fgetc(in_file) != 8) {
+ error_msg("Unknown compression method");
+ return(-1);
}
flags = (unsigned char) fgetc(in_file);
/* Ignore time stamp(4), extra flags(1), OS type(1) */
- for (i = 0; i < 6; i++)
+ for (i = 0; i < 6; i++) {
fgetc(in_file);
+ }
- if ((flags & extra_field) != 0) {
- size_t extra;
- extra = fgetc(in_file);
- extra += fgetc(in_file) << 8;
+ if (flags & 0x04) {
+ /* bit 2 set: extra field present */
+ const unsigned short extra = fgetc(in_file) + (fgetc(in_file) << 8);
- for (i = 0; i < extra; i++)
+ for (i = 0; i < extra; i++) {
fgetc(in_file);
+ }
}
/* Discard original name if any */
- if ((flags & orig_name) != 0) {
+ if (flags & 0x08) {
+ /* bit 3 set: original file name present */
while (fgetc(in_file) != 0); /* null */
}
/* Discard file comment if any */
- if ((flags & comment) != 0) {
+ if (flags & 0x10) {
+ /* bit 4 set: file comment present */
while (fgetc(in_file) != 0); /* null */
}
- if (method < 0) {
- printf("it failed\n");
- return(exit_code); /* error message already emitted */
- }
-
- make_crc_table();
-
/* Decompress */
- if (method == 8) {
-
- int res = inflate();
-
- if (res == 3) {
- error_msg(memory_exhausted);
- } else if (res != 0) {
- error_msg("invalid compressed data--format violated");
- }
-
- } else {
- error_msg("internal error, invalid method");
+ if (inflate() != 0) {
+ error_msg("invalid compressed data--format violated");
}
/* Get the crc and original length
@@ -1023,6 +998,7 @@
if (waitpid(gunzip_pid, NULL, 0) == -1) {
printf("Couldnt wait ?");
}
- free(window);
- free(crc_table);
+
+ free(window);
+ free(crc_table);
}