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Diffstat (limited to 'lib_generic/lzo/lzo1x_decompress.c')
-rw-r--r--lib_generic/lzo/lzo1x_decompress.c332
1 files changed, 0 insertions, 332 deletions
diff --git a/lib_generic/lzo/lzo1x_decompress.c b/lib_generic/lzo/lzo1x_decompress.c
deleted file mode 100644
index 09bdc8f..0000000
--- a/lib_generic/lzo/lzo1x_decompress.c
+++ /dev/null
@@ -1,332 +0,0 @@
-/*
- * LZO1X Decompressor from MiniLZO
- *
- * Copyright (C) 1996-2005 Markus F.X.J. Oberhumer <markus@oberhumer.com>
- *
- * The full LZO package can be found at:
- * http://www.oberhumer.com/opensource/lzo/
- *
- * Changed for kernel use by:
- * Nitin Gupta <nitingupta910@gmail.com>
- * Richard Purdie <rpurdie@openedhand.com>
- */
-
-#include <common.h>
-#include <linux/lzo.h>
-#include <asm/byteorder.h>
-#include <asm/unaligned.h>
-#include "lzodefs.h"
-
-#define HAVE_IP(x, ip_end, ip) ((size_t)(ip_end - ip) < (x))
-#define HAVE_OP(x, op_end, op) ((size_t)(op_end - op) < (x))
-#define HAVE_LB(m_pos, out, op) (m_pos < out || m_pos >= op)
-
-#define COPY4(dst, src) \
- put_unaligned(get_unaligned((const u32 *)(src)), (u32 *)(dst))
-
-static const unsigned char lzop_magic[] = {
- 0x89, 0x4c, 0x5a, 0x4f, 0x00, 0x0d, 0x0a, 0x1a, 0x0a
-};
-
-#define HEADER_HAS_FILTER 0x00000800L
-
-static inline const unsigned char *parse_header(const unsigned char *src)
-{
- u8 level = 0;
- u16 version;
- int i;
-
- /* read magic: 9 first bytes */
- for (i = 0; i < ARRAY_SIZE(lzop_magic); i++) {
- if (*src++ != lzop_magic[i])
- return NULL;
- }
- /* get version (2bytes), skip library version (2),
- * 'need to be extracted' version (2) and
- * method (1) */
- version = get_unaligned_be16(src);
- src += 7;
- if (version >= 0x0940)
- level = *src++;
- if (get_unaligned_be32(src) & HEADER_HAS_FILTER)
- src += 4; /* filter info */
-
- /* skip flags, mode and mtime_low */
- src += 12;
- if (version >= 0x0940)
- src += 4; /* skip mtime_high */
-
- i = *src++;
- /* don't care about the file name, and skip checksum */
- src += i + 4;
-
- return src;
-}
-
-int lzop_decompress(const unsigned char *src, size_t src_len,
- unsigned char *dst, size_t *dst_len)
-{
- unsigned char *start = dst;
- const unsigned char *send = src + src_len;
- u32 slen, dlen;
- size_t tmp;
- int r;
-
- src = parse_header(src);
- if (!src)
- return LZO_E_ERROR;
-
- while (src < send) {
- /* read uncompressed block size */
- dlen = get_unaligned_be32(src);
- src += 4;
-
- /* exit if last block */
- if (dlen == 0) {
- *dst_len = dst - start;
- return LZO_E_OK;
- }
-
- /* read compressed block size, and skip block checksum info */
- slen = get_unaligned_be32(src);
- src += 8;
-
- if (slen <= 0 || slen > dlen)
- return LZO_E_ERROR;
-
- /* decompress */
- tmp = dlen;
- r = lzo1x_decompress_safe((u8 *) src, slen, dst, &tmp);
-
- if (r != LZO_E_OK)
- return r;
-
- if (dlen != tmp)
- return LZO_E_ERROR;
-
- src += slen;
- dst += dlen;
- }
-
- return LZO_E_INPUT_OVERRUN;
-}
-
-int lzo1x_decompress_safe(const unsigned char *in, size_t in_len,
- unsigned char *out, size_t *out_len)
-{
- const unsigned char * const ip_end = in + in_len;
- unsigned char * const op_end = out + *out_len;
- const unsigned char *ip = in, *m_pos;
- unsigned char *op = out;
- size_t t;
-
- *out_len = 0;
-
- if (*ip > 17) {
- t = *ip++ - 17;
- if (t < 4)
- goto match_next;
- if (HAVE_OP(t, op_end, op))
- goto output_overrun;
- if (HAVE_IP(t + 1, ip_end, ip))
- goto input_overrun;
- do {
- *op++ = *ip++;
- } while (--t > 0);
- goto first_literal_run;
- }
-
- while ((ip < ip_end)) {
- t = *ip++;
- if (t >= 16)
- goto match;
- if (t == 0) {
- if (HAVE_IP(1, ip_end, ip))
- goto input_overrun;
- while (*ip == 0) {
- t += 255;
- ip++;
- if (HAVE_IP(1, ip_end, ip))
- goto input_overrun;
- }
- t += 15 + *ip++;
- }
- if (HAVE_OP(t + 3, op_end, op))
- goto output_overrun;
- if (HAVE_IP(t + 4, ip_end, ip))
- goto input_overrun;
-
- COPY4(op, ip);
- op += 4;
- ip += 4;
- if (--t > 0) {
- if (t >= 4) {
- do {
- COPY4(op, ip);
- op += 4;
- ip += 4;
- t -= 4;
- } while (t >= 4);
- if (t > 0) {
- do {
- *op++ = *ip++;
- } while (--t > 0);
- }
- } else {
- do {
- *op++ = *ip++;
- } while (--t > 0);
- }
- }
-
-first_literal_run:
- t = *ip++;
- if (t >= 16)
- goto match;
- m_pos = op - (1 + M2_MAX_OFFSET);
- m_pos -= t >> 2;
- m_pos -= *ip++ << 2;
-
- if (HAVE_LB(m_pos, out, op))
- goto lookbehind_overrun;
-
- if (HAVE_OP(3, op_end, op))
- goto output_overrun;
- *op++ = *m_pos++;
- *op++ = *m_pos++;
- *op++ = *m_pos;
-
- goto match_done;
-
- do {
-match:
- if (t >= 64) {
- m_pos = op - 1;
- m_pos -= (t >> 2) & 7;
- m_pos -= *ip++ << 3;
- t = (t >> 5) - 1;
- if (HAVE_LB(m_pos, out, op))
- goto lookbehind_overrun;
- if (HAVE_OP(t + 3 - 1, op_end, op))
- goto output_overrun;
- goto copy_match;
- } else if (t >= 32) {
- t &= 31;
- if (t == 0) {
- if (HAVE_IP(1, ip_end, ip))
- goto input_overrun;
- while (*ip == 0) {
- t += 255;
- ip++;
- if (HAVE_IP(1, ip_end, ip))
- goto input_overrun;
- }
- t += 31 + *ip++;
- }
- m_pos = op - 1;
- m_pos -= get_unaligned_le16(ip) >> 2;
- ip += 2;
- } else if (t >= 16) {
- m_pos = op;
- m_pos -= (t & 8) << 11;
-
- t &= 7;
- if (t == 0) {
- if (HAVE_IP(1, ip_end, ip))
- goto input_overrun;
- while (*ip == 0) {
- t += 255;
- ip++;
- if (HAVE_IP(1, ip_end, ip))
- goto input_overrun;
- }
- t += 7 + *ip++;
- }
- m_pos -= get_unaligned_le16(ip) >> 2;
- ip += 2;
- if (m_pos == op)
- goto eof_found;
- m_pos -= 0x4000;
- } else {
- m_pos = op - 1;
- m_pos -= t >> 2;
- m_pos -= *ip++ << 2;
-
- if (HAVE_LB(m_pos, out, op))
- goto lookbehind_overrun;
- if (HAVE_OP(2, op_end, op))
- goto output_overrun;
-
- *op++ = *m_pos++;
- *op++ = *m_pos;
- goto match_done;
- }
-
- if (HAVE_LB(m_pos, out, op))
- goto lookbehind_overrun;
- if (HAVE_OP(t + 3 - 1, op_end, op))
- goto output_overrun;
-
- if (t >= 2 * 4 - (3 - 1) && (op - m_pos) >= 4) {
- COPY4(op, m_pos);
- op += 4;
- m_pos += 4;
- t -= 4 - (3 - 1);
- do {
- COPY4(op, m_pos);
- op += 4;
- m_pos += 4;
- t -= 4;
- } while (t >= 4);
- if (t > 0)
- do {
- *op++ = *m_pos++;
- } while (--t > 0);
- } else {
-copy_match:
- *op++ = *m_pos++;
- *op++ = *m_pos++;
- do {
- *op++ = *m_pos++;
- } while (--t > 0);
- }
-match_done:
- t = ip[-2] & 3;
- if (t == 0)
- break;
-match_next:
- if (HAVE_OP(t, op_end, op))
- goto output_overrun;
- if (HAVE_IP(t + 1, ip_end, ip))
- goto input_overrun;
-
- *op++ = *ip++;
- if (t > 1) {
- *op++ = *ip++;
- if (t > 2)
- *op++ = *ip++;
- }
-
- t = *ip++;
- } while (ip < ip_end);
- }
-
- *out_len = op - out;
- return LZO_E_EOF_NOT_FOUND;
-
-eof_found:
- *out_len = op - out;
- return (ip == ip_end ? LZO_E_OK :
- (ip < ip_end ? LZO_E_INPUT_NOT_CONSUMED : LZO_E_INPUT_OVERRUN));
-input_overrun:
- *out_len = op - out;
- return LZO_E_INPUT_OVERRUN;
-
-output_overrun:
- *out_len = op - out;
- return LZO_E_OUTPUT_OVERRUN;
-
-lookbehind_overrun:
- *out_len = op - out;
- return LZO_E_LOOKBEHIND_OVERRUN;
-}
generated by cgit v1.1 at 2024-11-19 22:42:58 +0000