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-rw-r--r--toys/pending/xzcat.c194
1 files changed, 37 insertions, 157 deletions
diff --git a/toys/pending/xzcat.c b/toys/pending/xzcat.c
index 2e9fcbff..07886a62 100644
--- a/toys/pending/xzcat.c
+++ b/toys/pending/xzcat.c
@@ -23,18 +23,11 @@ config XZCAT
#include <stdbool.h>
// BEGIN xz.h
-/*
- * XZ decompressor
- *
- * Authors: Lasse Collin <lasse.collin@tukaani.org>
- * Igor Pavlov <http://7-zip.org/>
- *
- * This file has been put into the public domain.
- * You can do whatever you want with this file.
- */
#include <stddef.h>
#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
/**
@@ -246,13 +239,6 @@ void xz_dec_reset(struct xz_dec *s);
*/
void xz_dec_end(struct xz_dec *s);
-
-/*
- * This must be called before any other xz_* function to initialize
- * the CRC32 lookup table.
- */
-void xz_crc32_init(void);
-
/*
* Update CRC32 value using the polynomial from IEEE-802.3. To start a new
* calculation, the third argument must be zero. To continue the calculation,
@@ -261,19 +247,49 @@ void xz_crc32_init(void);
uint32_t xz_crc32(const uint8_t *buf, size_t size, uint32_t crc);
/*
- * This must be called before any other xz_* function (except xz_crc32_init())
+ * This must be called before any other xz_* function (but after crc_init())
* to initialize the CRC64 lookup table.
*/
-void xz_crc64_init(void);
+static uint64_t xz_crc64_table[256];
+
+void xz_crc64_init(void)
+{
+ const uint64_t poly = 0xC96C5795D7870F42ULL;
+
+ uint32_t i;
+ uint32_t j;
+ uint64_t r;
+
+ for (i = 0; i < 256; ++i) {
+ r = i;
+ for (j = 0; j < 8; ++j)
+ r = (r >> 1) ^ (poly & ~((r & 1) - 1));
+
+ xz_crc64_table[i] = r;
+ }
+
+ return;
+}
/*
* Update CRC64 value using the polynomial from ECMA-182. To start a new
* calculation, the third argument must be zero. To continue the calculation,
* the previously returned value is passed as the third argument.
*/
-uint64_t xz_crc64(const uint8_t *buf, size_t size, uint64_t crc);
+uint64_t xz_crc64(const uint8_t *buf, size_t size, uint64_t crc)
+{
+ crc = ~crc;
+
+ while (size != 0) {
+ crc = xz_crc64_table[*buf++ ^ (crc & 0xFF)] ^ (crc >> 8);
+ --size;
+ }
+
+ return ~crc;
+}
// END xz.h
+static uint32_t xz_crc32_table[256];
static uint8_t in[BUFSIZ];
static uint8_t out[BUFSIZ];
@@ -285,7 +301,7 @@ void xzcat_main(void)
enum xz_ret ret;
const char *msg;
- xz_crc32_init();
+ crc_init(xz_crc32_table, 1);
xz_crc64_init();
/*
@@ -370,41 +386,9 @@ error:
xz_dec_end(s);
error_exit("%s", msg);
}
-/*
- * CRC32 using the polynomial from IEEE-802.3
- * CRC64 using the polynomial from ECMA-182
- *
- * Authors: Lasse Collin <lasse.collin@tukaani.org>
- * Igor Pavlov <http://7-zip.org/>
- *
- * This file has been put into the public domain.
- * You can do whatever you want with this file.
- */
-
-/*
- * This is not the fastest implementation, but it is pretty compact.
- * The fastest versions of xz_crc32() on modern CPUs without hardware
- * accelerated CRC instruction are 3-5 times as fast as this version,
- * but they are bigger and use more memory for the lookup table.
- */
// BEGIN xz_private.h
-/*
- * Private includes and definitions
- *
- * Author: Lasse Collin <lasse.collin@tukaani.org>
- *
- * This file has been put into the public domain.
- * You can do whatever you want with this file.
- *
- * Modified for toybox by Isaac Dunham.
- */
-
-#ifndef XZ_PRIVATE_H
-#define XZ_PRIVATE_H
-/* Enable CRC64 support. */
-#define XZ_USE_CRC64
/* Uncomment as needed to enable BCJ filter decoders.
* These cost about 2.5 k when all are enabled; SPARC and IA64 make 0.7 k
@@ -417,9 +401,6 @@ error:
#define XZ_DEC_ARMTHUMB
#define XZ_DEC_SPARC
-#include <stdbool.h>
-#include <stdlib.h>
-#include <string.h>
#define memeq(a, b, size) (memcmp(a, b, size) == 0)
#define memzero(buf, size) memset(buf, 0, size)
@@ -601,39 +582,8 @@ enum xz_ret xz_dec_bcj_run(struct xz_dec_bcj *s,
#define xz_dec_bcj_end(s) free(s)
#endif
-#endif
-
// END "xz_private.h"
-/*
- * STATIC_RW_DATA is used in the pre-boot environment on some architectures.
- * See <linux/decompress/mm.h> for details.
- */
-#ifndef STATIC_RW_DATA
-# define STATIC_RW_DATA static
-#endif
-
-STATIC_RW_DATA uint32_t xz_crc32_table[256];
-
-void xz_crc32_init(void)
-{
- const uint32_t poly = 0xEDB88320;
-
- uint32_t i;
- uint32_t j;
- uint32_t r;
-
- for (i = 0; i < 256; ++i) {
- r = i;
- for (j = 0; j < 8; ++j)
- r = (r >> 1) ^ (poly & ~((r & 1) - 1));
-
- xz_crc32_table[i] = r;
- }
-
- return;
-}
-
uint32_t xz_crc32(const uint8_t *buf, size_t size, uint32_t crc)
{
crc = ~crc;
@@ -648,50 +598,9 @@ uint32_t xz_crc32(const uint8_t *buf, size_t size, uint32_t crc)
-STATIC_RW_DATA uint64_t xz_crc64_table[256];
-
-void xz_crc64_init(void)
-{
- const uint64_t poly = 0xC96C5795D7870F42ULL;
-
- uint32_t i;
- uint32_t j;
- uint64_t r;
-
- for (i = 0; i < 256; ++i) {
- r = i;
- for (j = 0; j < 8; ++j)
- r = (r >> 1) ^ (poly & ~((r & 1) - 1));
-
- xz_crc64_table[i] = r;
- }
-
- return;
-}
-
-uint64_t xz_crc64(const uint8_t *buf, size_t size, uint64_t crc)
-{
- crc = ~crc;
-
- while (size != 0) {
- crc = xz_crc64_table[*buf++ ^ (crc & 0xFF)] ^ (crc >> 8);
- --size;
- }
-
- return ~crc;
-}
/*
* Branch/Call/Jump (BCJ) filter decoders
- *
- * Authors: Lasse Collin <lasse.collin@tukaani.org>
- * Igor Pavlov <http://7-zip.org/>
- *
- * This file has been put into the public domain.
- * You can do whatever you want with this file.
- */
-
-/*
- * The rest of the file is inside this ifdef. It makes things a little more
+ * The rest of the code is inside this ifdef. It makes things a little more
* convenient when building without support for any BCJ filters.
*/
#ifdef XZ_DEC_BCJ
@@ -1254,12 +1163,6 @@ enum xz_ret xz_dec_bcj_reset(struct xz_dec_bcj *s, uint8_t id)
#endif
/*
* LZMA2 decoder
- *
- * Authors: Lasse Collin <lasse.collin@tukaani.org>
- * Igor Pavlov <http://7-zip.org/>
- *
- * This file has been put into the public domain.
- * You can do whatever you want with this file.
*/
@@ -1267,15 +1170,8 @@ enum xz_ret xz_dec_bcj_reset(struct xz_dec_bcj *s, uint8_t id)
/*
* LZMA2 definitions
*
- * Authors: Lasse Collin <lasse.collin@tukaani.org>
- * Igor Pavlov <http://7-zip.org/>
- *
- * This file has been put into the public domain.
- * You can do whatever you want with this file.
*/
-#ifndef XZ_LZMA2_H
-#define XZ_LZMA2_H
/* Range coder constants */
#define RC_SHIFT_BITS 8
@@ -1467,7 +1363,6 @@ static inline uint32_t lzma_get_dist_state(uint32_t len)
*/
#define REPS 4
-#endif
// END xz_lzma2.h
@@ -2631,27 +2526,14 @@ void xz_dec_lzma2_end(struct xz_dec_lzma2 *s)
}
/*
* .xz Stream decoder
- *
- * Author: Lasse Collin <lasse.collin@tukaani.org>
- *
- * This file has been put into the public domain.
- * You can do whatever you want with this file.
*/
// BEGIN xz_stream.h
/*
* Definitions for handling the .xz file format
- *
- * Author: Lasse Collin <lasse.collin@tukaani.org>
- *
- * This file has been put into the public domain.
- * You can do whatever you want with this file.
*/
-#ifndef XZ_STREAM_H
-#define XZ_STREAM_H
-
/*
* See the .xz file format specification at
* http://tukaani.org/xz/xz-file-format.txt
@@ -2693,8 +2575,6 @@ enum xz_check {
/* Maximum possible Check ID */
#define XZ_CHECK_MAX 15
-
-#endif
// END xz_stream.h
#define IS_CRC64(check_type) ((check_type) == XZ_CHECK_CRC64)
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-18 05:23:41 +0000