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Diffstat (limited to 'archival/libunarchive/decompress_uncompress.c')
-rw-r--r--archival/libunarchive/decompress_uncompress.c98
1 files changed, 49 insertions, 49 deletions
diff --git a/archival/libunarchive/decompress_uncompress.c b/archival/libunarchive/decompress_uncompress.c
index ba73f1132..8c3c65d1a 100644
--- a/archival/libunarchive/decompress_uncompress.c
+++ b/archival/libunarchive/decompress_uncompress.c
@@ -7,7 +7,6 @@
* (see disclaimer below)
*/
-
/* (N)compress42.c - File compression ala IEEE Computer, Mar 1992.
*
* Authors:
@@ -34,53 +33,48 @@
#define OBUFSIZ 2048
/* Defines for third byte of header */
-#define MAGIC_1 (char_type)'\037' /* First byte of compressed file */
-#define MAGIC_2 (char_type)'\235' /* Second byte of compressed file */
-#define BIT_MASK 0x1f /* Mask for 'number of compresssion bits' */
- /* Masks 0x20 and 0x40 are free. */
- /* I think 0x20 should mean that there is */
- /* a fourth header byte (for expansion). */
-#define BLOCK_MODE 0x80 /* Block compresssion if table is full and */
- /* compression rate is dropping flush tables */
- /* the next two codes should not be changed lightly, as they must not */
- /* lie within the contiguous general code space. */
-#define FIRST 257 /* first free entry */
-#define CLEAR 256 /* table clear output code */
-
-#define INIT_BITS 9 /* initial number of bits/code */
-
+#define BIT_MASK 0x1f /* Mask for 'number of compresssion bits' */
+ /* Masks 0x20 and 0x40 are free. */
+ /* I think 0x20 should mean that there is */
+ /* a fourth header byte (for expansion). */
+#define BLOCK_MODE 0x80 /* Block compression if table is full and */
+ /* compression rate is dropping flush tables */
+ /* the next two codes should not be changed lightly, as they must not */
+ /* lie within the contiguous general code space. */
+#define FIRST 257 /* first free entry */
+#define CLEAR 256 /* table clear output code */
-/* machine variants which require cc -Dmachine: pdp11, z8000, DOS */
-#define FAST
+#define INIT_BITS 9 /* initial number of bits/code */
-#define HBITS 17 /* 50% occupancy */
-#define HSIZE (1<<HBITS)
-#define HMASK (HSIZE-1)
-#define HPRIME 9941
-#define BITS 16
-#undef MAXSEG_64K
-#define MAXCODE(n) (1L << (n))
-
-#define htabof(i) htab[i]
-#define codetabof(i) codetab[i]
-#define tab_prefixof(i) codetabof(i)
-#define tab_suffixof(i) ((unsigned char *)(htab))[i]
-#define de_stack ((unsigned char *)&(htab[HSIZE-1]))
-#define clear_htab() memset(htab, -1, HSIZE)
-#define clear_tab_prefixof() memset(codetab, 0, 256);
+/* machine variants which require cc -Dmachine: pdp11, z8000, DOS */
+#define HBITS 17 /* 50% occupancy */
+#define HSIZE (1<<HBITS)
+#define HMASK (HSIZE-1) /* unused */
+#define HPRIME 9941 /* unused */
+#define BITS 16
+#define BITS_STR "16"
+#undef MAXSEG_64K /* unused */
+#define MAXCODE(n) (1L << (n))
+
+#define htabof(i) htab[i]
+#define codetabof(i) codetab[i]
+#define tab_prefixof(i) codetabof(i)
+#define tab_suffixof(i) ((unsigned char *)(htab))[i]
+#define de_stack ((unsigned char *)&(htab[HSIZE-1]))
+#define clear_tab_prefixof() memset(codetab, 0, 256)
/*
* Decompress stdin to stdout. This routine adapts to the codes in the
* file building the "string" table on-the-fly; requiring no table to
- * be stored in the compressed file. The tables used herein are shared
- * with those of the compress() routine. See the definitions above.
+ * be stored in the compressed file.
*/
USE_DESKTOP(long long) int
uncompress(int fd_in, int fd_out)
{
USE_DESKTOP(long long total_written = 0;)
+ USE_DESKTOP(long long) int retval = -1;
unsigned char *stackp;
long code;
int finchar;
@@ -96,10 +90,10 @@ uncompress(int fd_in, int fd_out)
long maxmaxcode;
int n_bits;
int rsize = 0;
- RESERVE_CONFIG_UBUFFER(inbuf, IBUFSIZ + 64);
- RESERVE_CONFIG_UBUFFER(outbuf, OBUFSIZ + 2048);
- unsigned char htab[HSIZE];
- unsigned short codetab[HSIZE];
+ unsigned char *inbuf; /* were eating insane amounts of stack - */
+ unsigned char *outbuf; /* bad for some embedded targets */
+ unsigned char *htab;
+ unsigned short *codetab;
/* Hmm, these were statics - why?! */
/* user settable max # bits/code */
@@ -107,8 +101,10 @@ uncompress(int fd_in, int fd_out)
/* block compress mode -C compatible with 2.0 */
int block_mode; /* = BLOCK_MODE; */
- memset(inbuf, 0, IBUFSIZ + 64);
- memset(outbuf, 0, OBUFSIZ + 2048);
+ inbuf = xzalloc(IBUFSIZ + 64);
+ outbuf = xzalloc(OBUFSIZ + 2048);
+ htab = xzalloc(HSIZE); /* wsn't zeroed out before, maybe can xmalloc? */
+ codetab = xzalloc(HSIZE * sizeof(codetab[0]));
insize = 0;
@@ -116,7 +112,7 @@ uncompress(int fd_in, int fd_out)
* to do some cleanup (e.g. delete incomplete unpacked file etc) */
if (full_read(fd_in, inbuf, 1) != 1) {
bb_error_msg("short read");
- return -1;
+ goto err;
}
maxbits = inbuf[0] & BIT_MASK;
@@ -125,8 +121,8 @@ uncompress(int fd_in, int fd_out)
if (maxbits > BITS) {
bb_error_msg("compressed with %d bits, can only handle "
- "%d bits", maxbits, BITS);
- return -1;
+ BITS_STR" bits", maxbits);
+ goto err;
}
n_bits = INIT_BITS;
@@ -140,7 +136,7 @@ uncompress(int fd_in, int fd_out)
free_ent = ((block_mode) ? FIRST : 256);
/* As above, initialize the first 256 entries in the table. */
- clear_tab_prefixof();
+ /*clear_tab_prefixof(); - done by xzalloc */
for (code = 255; code >= 0; --code) {
tab_suffixof(code) = (unsigned char) code;
@@ -232,7 +228,7 @@ uncompress(int fd_in, int fd_out)
insize, posbits, p[-1], p[0], p[1], p[2], p[3],
(posbits & 07));
bb_error_msg("uncompress: corrupt input");
- return -1;
+ goto err;
}
*--stackp = (unsigned char) finchar;
@@ -299,7 +295,11 @@ uncompress(int fd_in, int fd_out)
USE_DESKTOP(total_written += outpos;)
}
- RELEASE_CONFIG_BUFFER(inbuf);
- RELEASE_CONFIG_BUFFER(outbuf);
- return USE_DESKTOP(total_written) + 0;
+ retval = USE_DESKTOP(total_written) + 0;
+ err:
+ free(inbuf);
+ free(outbuf);
+ free(htab);
+ free(codetab);
+ return retval;
}