| /* vi: set sw=4 ts=4: */ |
| /* |
| * gunzip implementation for busybox |
| * |
| * Based on GNU gzip v1.2.4 Copyright (C) 1992-1993 Jean-loup Gailly. |
| * |
| * Originally adjusted for busybox by Sven Rudolph <sr1@inf.tu-dresden.de> |
| * based on gzip sources |
| * |
| * Adjusted further by Erik Andersen <andersen@codepoet.org> to support |
| * files as well as stdin/stdout, and to generally behave itself wrt |
| * command line handling. |
| * |
| * General cleanup to better adhere to the style guide and make use of standard |
| * busybox functions by Glenn McGrath |
| * |
| * read_gz interface + associated hacking by Laurence Anderson |
| * |
| * Fixed huft_build() so decoding end-of-block code does not grab more bits |
| * than necessary (this is required by unzip applet), added inflate_cleanup() |
| * to free leaked bytebuffer memory (used in unzip.c), and some minor style |
| * guide cleanups by Ed Clark |
| * |
| * gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface |
| * Copyright (C) 1992-1993 Jean-loup Gailly |
| * The unzip code was written and put in the public domain by Mark Adler. |
| * Portions of the lzw code are derived from the public domain 'compress' |
| * written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies, |
| * Ken Turkowski, Dave Mack and Peter Jannesen. |
| * |
| * See the file algorithm.doc for the compression algorithms and file formats. |
| * |
| * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
| */ |
| |
| #include <setjmp.h> |
| #include "libbb.h" |
| #include "unarchive.h" |
| |
| typedef struct huft_t { |
| unsigned char e; /* number of extra bits or operation */ |
| unsigned char b; /* number of bits in this code or subcode */ |
| union { |
| unsigned short n; /* literal, length base, or distance base */ |
| struct huft_t *t; /* pointer to next level of table */ |
| } v; |
| } huft_t; |
| |
| enum { |
| /* gunzip_window size--must be a power of two, and |
| * at least 32K for zip's deflate method */ |
| GUNZIP_WSIZE = 0x8000, |
| /* If BMAX needs to be larger than 16, then h and x[] should be ulg. */ |
| BMAX = 16, /* maximum bit length of any code (16 for explode) */ |
| N_MAX = 288, /* maximum number of codes in any set */ |
| }; |
| |
| |
| /* This is somewhat complex-looking arrangement, but it allows |
| * to place decompressor state either in bss or in |
| * malloc'ed space simply by changing #defines below. |
| * Sizes on i386: |
| * text data bss dec hex |
| * 5256 0 108 5364 14f4 - bss |
| * 4915 0 0 4915 1333 - malloc |
| */ |
| #define STATE_IN_BSS 0 |
| #define STATE_IN_MALLOC 1 |
| |
| |
| typedef struct state_t { |
| off_t gunzip_bytes_out; /* number of output bytes */ |
| uint32_t gunzip_crc; |
| |
| int gunzip_src_fd; |
| unsigned gunzip_outbuf_count; /* bytes in output buffer */ |
| |
| unsigned char *gunzip_window; |
| |
| uint32_t *gunzip_crc_table; |
| |
| /* bitbuffer */ |
| unsigned gunzip_bb; /* bit buffer */ |
| unsigned char gunzip_bk; /* bits in bit buffer */ |
| |
| /* input (compressed) data */ |
| unsigned char *bytebuffer; /* buffer itself */ |
| unsigned bytebuffer_max; /* buffer size */ |
| unsigned bytebuffer_offset; /* buffer position */ |
| unsigned bytebuffer_size; /* how much data is there (size <= max) */ |
| |
| /* private data of inflate_codes() */ |
| unsigned inflate_codes_ml; /* masks for bl and bd bits */ |
| unsigned inflate_codes_md; /* masks for bl and bd bits */ |
| unsigned inflate_codes_bb; /* bit buffer */ |
| unsigned inflate_codes_k; /* number of bits in bit buffer */ |
| unsigned inflate_codes_w; /* current gunzip_window position */ |
| huft_t *inflate_codes_tl; |
| huft_t *inflate_codes_td; |
| unsigned inflate_codes_bl; |
| unsigned inflate_codes_bd; |
| unsigned inflate_codes_nn; /* length and index for copy */ |
| unsigned inflate_codes_dd; |
| |
| smallint resume_copy; |
| |
| /* private data of inflate_get_next_window() */ |
| smallint method; /* method == -1 for stored, -2 for codes */ |
| smallint need_another_block; |
| smallint end_reached; |
| |
| /* private data of inflate_stored() */ |
| unsigned inflate_stored_n; |
| unsigned inflate_stored_b; |
| unsigned inflate_stored_k; |
| unsigned inflate_stored_w; |
| |
| const char *error_msg; |
| jmp_buf error_jmp; |
| } state_t; |
| #define gunzip_bytes_out (S()gunzip_bytes_out ) |
| #define gunzip_crc (S()gunzip_crc ) |
| #define gunzip_src_fd (S()gunzip_src_fd ) |
| #define gunzip_outbuf_count (S()gunzip_outbuf_count) |
| #define gunzip_window (S()gunzip_window ) |
| #define gunzip_crc_table (S()gunzip_crc_table ) |
| #define gunzip_bb (S()gunzip_bb ) |
| #define gunzip_bk (S()gunzip_bk ) |
| #define bytebuffer_max (S()bytebuffer_max ) |
| #define bytebuffer (S()bytebuffer ) |
| #define bytebuffer_offset (S()bytebuffer_offset ) |
| #define bytebuffer_size (S()bytebuffer_size ) |
| #define inflate_codes_ml (S()inflate_codes_ml ) |
| #define inflate_codes_md (S()inflate_codes_md ) |
| #define inflate_codes_bb (S()inflate_codes_bb ) |
| #define inflate_codes_k (S()inflate_codes_k ) |
| #define inflate_codes_w (S()inflate_codes_w ) |
| #define inflate_codes_tl (S()inflate_codes_tl ) |
| #define inflate_codes_td (S()inflate_codes_td ) |
| #define inflate_codes_bl (S()inflate_codes_bl ) |
| #define inflate_codes_bd (S()inflate_codes_bd ) |
| #define inflate_codes_nn (S()inflate_codes_nn ) |
| #define inflate_codes_dd (S()inflate_codes_dd ) |
| #define resume_copy (S()resume_copy ) |
| #define method (S()method ) |
| #define need_another_block (S()need_another_block ) |
| #define end_reached (S()end_reached ) |
| #define inflate_stored_n (S()inflate_stored_n ) |
| #define inflate_stored_b (S()inflate_stored_b ) |
| #define inflate_stored_k (S()inflate_stored_k ) |
| #define inflate_stored_w (S()inflate_stored_w ) |
| #define error_msg (S()error_msg ) |
| #define error_jmp (S()error_jmp ) |
| |
| /* This is a generic part */ |
| #if STATE_IN_BSS /* Use global data segment */ |
| #define DECLARE_STATE /*nothing*/ |
| #define ALLOC_STATE /*nothing*/ |
| #define DEALLOC_STATE ((void)0) |
| #define S() state. |
| #define PASS_STATE /*nothing*/ |
| #define PASS_STATE_ONLY /*nothing*/ |
| #define STATE_PARAM /*nothing*/ |
| #define STATE_PARAM_ONLY void |
| static state_t state; |
| #endif |
| |
| #if STATE_IN_MALLOC /* Use malloc space */ |
| #define DECLARE_STATE state_t *state |
| #define ALLOC_STATE (state = xzalloc(sizeof(*state))) |
| #define DEALLOC_STATE free(state) |
| #define S() state-> |
| #define PASS_STATE state, |
| #define PASS_STATE_ONLY state |
| #define STATE_PARAM state_t *state, |
| #define STATE_PARAM_ONLY state_t *state |
| #endif |
| |
| |
| static const uint16_t mask_bits[] ALIGN2 = { |
| 0x0000, 0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff, |
| 0x01ff, 0x03ff, 0x07ff, 0x0fff, 0x1fff, 0x3fff, 0x7fff, 0xffff |
| }; |
| |
| /* Copy lengths for literal codes 257..285 */ |
| static const uint16_t cplens[] ALIGN2 = { |
| 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31, 35, 43, 51, 59, |
| 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0 |
| }; |
| |
| /* note: see note #13 above about the 258 in this list. */ |
| /* Extra bits for literal codes 257..285 */ |
| static const uint8_t cplext[] ALIGN1 = { |
| 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, |
| 5, 5, 5, 0, 99, 99 |
| }; /* 99 == invalid */ |
| |
| /* Copy offsets for distance codes 0..29 */ |
| static const uint16_t cpdist[] ALIGN2 = { |
| 1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193, 257, 385, 513, |
| 769, 1025, 1537, 2049, 3073, 4097, 6145, 8193, 12289, 16385, 24577 |
| }; |
| |
| /* Extra bits for distance codes */ |
| static const uint8_t cpdext[] ALIGN1 = { |
| 0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, |
| 11, 11, 12, 12, 13, 13 |
| }; |
| |
| /* Tables for deflate from PKZIP's appnote.txt. */ |
| /* Order of the bit length code lengths */ |
| static const uint8_t border[] ALIGN1 = { |
| 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15 |
| }; |
| |
| |
| /* |
| * Free the malloc'ed tables built by huft_build(), which makes a linked |
| * list of the tables it made, with the links in a dummy first entry of |
| * each table. |
| * t: table to free |
| */ |
| static void huft_free(huft_t *p) |
| { |
| huft_t *q; |
| |
| /* Go through linked list, freeing from the malloced (t[-1]) address. */ |
| while (p) { |
| q = (--p)->v.t; |
| free(p); |
| p = q; |
| } |
| } |
| |
| static void huft_free_all(STATE_PARAM_ONLY) |
| { |
| huft_free(inflate_codes_tl); |
| huft_free(inflate_codes_td); |
| inflate_codes_tl = NULL; |
| inflate_codes_td = NULL; |
| } |
| |
| static void abort_unzip(STATE_PARAM_ONLY) ATTRIBUTE_NORETURN; |
| static void abort_unzip(STATE_PARAM_ONLY) |
| { |
| huft_free_all(PASS_STATE_ONLY); |
| longjmp(error_jmp, 1); |
| } |
| |
| static unsigned fill_bitbuffer(STATE_PARAM unsigned bitbuffer, unsigned *current, const unsigned required) |
| { |
| while (*current < required) { |
| if (bytebuffer_offset >= bytebuffer_size) { |
| /* Leave the first 4 bytes empty so we can always unwind the bitbuffer |
| * to the front of the bytebuffer */ |
| bytebuffer_size = safe_read(gunzip_src_fd, &bytebuffer[4], bytebuffer_max - 4); |
| if ((int)bytebuffer_size < 1) { |
| error_msg = "unexpected end of file"; |
| abort_unzip(PASS_STATE_ONLY); |
| } |
| bytebuffer_size += 4; |
| bytebuffer_offset = 4; |
| } |
| bitbuffer |= ((unsigned) bytebuffer[bytebuffer_offset]) << *current; |
| bytebuffer_offset++; |
| *current += 8; |
| } |
| return bitbuffer; |
| } |
| |
| |
| /* Given a list of code lengths and a maximum table size, make a set of |
| * tables to decode that set of codes. Return zero on success, one if |
| * the given code set is incomplete (the tables are still built in this |
| * case), two if the input is invalid (all zero length codes or an |
| * oversubscribed set of lengths) - in this case stores NULL in *t. |
| * |
| * b: code lengths in bits (all assumed <= BMAX) |
| * n: number of codes (assumed <= N_MAX) |
| * s: number of simple-valued codes (0..s-1) |
| * d: list of base values for non-simple codes |
| * e: list of extra bits for non-simple codes |
| * t: result: starting table |
| * m: maximum lookup bits, returns actual |
| */ |
| static int huft_build(const unsigned *b, const unsigned n, |
| const unsigned s, const unsigned short *d, |
| const unsigned char *e, huft_t **t, unsigned *m) |
| { |
| unsigned a; /* counter for codes of length k */ |
| unsigned c[BMAX + 1]; /* bit length count table */ |
| unsigned eob_len; /* length of end-of-block code (value 256) */ |
| unsigned f; /* i repeats in table every f entries */ |
| int g; /* maximum code length */ |
| int htl; /* table level */ |
| unsigned i; /* counter, current code */ |
| unsigned j; /* counter */ |
| int k; /* number of bits in current code */ |
| unsigned *p; /* pointer into c[], b[], or v[] */ |
| huft_t *q; /* points to current table */ |
| huft_t r; /* table entry for structure assignment */ |
| huft_t *u[BMAX]; /* table stack */ |
| unsigned v[N_MAX]; /* values in order of bit length */ |
| int ws[BMAX + 1]; /* bits decoded stack */ |
| int w; /* bits decoded */ |
| unsigned x[BMAX + 1]; /* bit offsets, then code stack */ |
| unsigned *xp; /* pointer into x */ |
| int y; /* number of dummy codes added */ |
| unsigned z; /* number of entries in current table */ |
| |
| /* Length of EOB code, if any */ |
| eob_len = n > 256 ? b[256] : BMAX; |
| |
| *t = NULL; |
| |
| /* Generate counts for each bit length */ |
| memset(c, 0, sizeof(c)); |
| p = (unsigned *) b; /* cast allows us to reuse p for pointing to b */ |
| i = n; |
| do { |
| c[*p]++; /* assume all entries <= BMAX */ |
| p++; /* can't combine with above line (Solaris bug) */ |
| } while (--i); |
| if (c[0] == n) { /* null input - all zero length codes */ |
| *m = 0; |
| return 2; |
| } |
| |
| /* Find minimum and maximum length, bound *m by those */ |
| for (j = 1; (c[j] == 0) && (j <= BMAX); j++) |
| continue; |
| k = j; /* minimum code length */ |
| for (i = BMAX; (c[i] == 0) && i; i--) |
| continue; |
| g = i; /* maximum code length */ |
| *m = (*m < j) ? j : ((*m > i) ? i : *m); |
| |
| /* Adjust last length count to fill out codes, if needed */ |
| for (y = 1 << j; j < i; j++, y <<= 1) { |
| y -= c[j]; |
| if (y < 0) |
| return 2; /* bad input: more codes than bits */ |
| } |
| y -= c[i]; |
| if (y < 0) |
| return 2; |
| c[i] += y; |
| |
| /* Generate starting offsets into the value table for each length */ |
| x[1] = j = 0; |
| p = c + 1; |
| xp = x + 2; |
| while (--i) { /* note that i == g from above */ |
| j += *p++; |
| *xp++ = j; |
| } |
| |
| /* Make a table of values in order of bit lengths */ |
| p = (unsigned *) b; |
| i = 0; |
| do { |
| j = *p++; |
| if (j != 0) { |
| v[x[j]++] = i; |
| } |
| } while (++i < n); |
| |
| /* Generate the Huffman codes and for each, make the table entries */ |
| x[0] = i = 0; /* first Huffman code is zero */ |
| p = v; /* grab values in bit order */ |
| htl = -1; /* no tables yet--level -1 */ |
| w = ws[0] = 0; /* bits decoded */ |
| u[0] = NULL; /* just to keep compilers happy */ |
| q = NULL; /* ditto */ |
| z = 0; /* ditto */ |
| |
| /* go through the bit lengths (k already is bits in shortest code) */ |
| for (; k <= g; k++) { |
| a = c[k]; |
| while (a--) { |
| /* here i is the Huffman code of length k bits for value *p */ |
| /* make tables up to required level */ |
| while (k > ws[htl + 1]) { |
| w = ws[++htl]; |
| |
| /* compute minimum size table less than or equal to *m bits */ |
| z = g - w; |
| z = z > *m ? *m : z; /* upper limit on table size */ |
| j = k - w; |
| f = 1 << j; |
| if (f > a + 1) { /* try a k-w bit table */ |
| /* too few codes for k-w bit table */ |
| f -= a + 1; /* deduct codes from patterns left */ |
| xp = c + k; |
| while (++j < z) { /* try smaller tables up to z bits */ |
| f <<= 1; |
| if (f <= *++xp) { |
| break; /* enough codes to use up j bits */ |
| } |
| f -= *xp; /* else deduct codes from patterns */ |
| } |
| } |
| j = (w + j > eob_len && w < eob_len) ? eob_len - w : j; /* make EOB code end at table */ |
| z = 1 << j; /* table entries for j-bit table */ |
| ws[htl+1] = w + j; /* set bits decoded in stack */ |
| |
| /* allocate and link in new table */ |
| q = xzalloc((z + 1) * sizeof(huft_t)); |
| *t = q + 1; /* link to list for huft_free() */ |
| t = &(q->v.t); |
| u[htl] = ++q; /* table starts after link */ |
| |
| /* connect to last table, if there is one */ |
| if (htl) { |
| x[htl] = i; /* save pattern for backing up */ |
| r.b = (unsigned char) (w - ws[htl - 1]); /* bits to dump before this table */ |
| r.e = (unsigned char) (16 + j); /* bits in this table */ |
| r.v.t = q; /* pointer to this table */ |
| j = (i & ((1 << w) - 1)) >> ws[htl - 1]; |
| u[htl - 1][j] = r; /* connect to last table */ |
| } |
| } |
| |
| /* set up table entry in r */ |
| r.b = (unsigned char) (k - w); |
| if (p >= v + n) { |
| r.e = 99; /* out of values--invalid code */ |
| } else if (*p < s) { |
| r.e = (unsigned char) (*p < 256 ? 16 : 15); /* 256 is EOB code */ |
| r.v.n = (unsigned short) (*p++); /* simple code is just the value */ |
| } else { |
| r.e = (unsigned char) e[*p - s]; /* non-simple--look up in lists */ |
| r.v.n = d[*p++ - s]; |
| } |
| |
| /* fill code-like entries with r */ |
| f = 1 << (k - w); |
| for (j = i >> w; j < z; j += f) { |
| q[j] = r; |
| } |
| |
| /* backwards increment the k-bit code i */ |
| for (j = 1 << (k - 1); i & j; j >>= 1) { |
| i ^= j; |
| } |
| i ^= j; |
| |
| /* backup over finished tables */ |
| while ((i & ((1 << w) - 1)) != x[htl]) { |
| w = ws[--htl]; |
| } |
| } |
| } |
| |
| /* return actual size of base table */ |
| *m = ws[1]; |
| |
| /* Return 1 if we were given an incomplete table */ |
| return y != 0 && g != 1; |
| } |
| |
| |
| /* |
| * inflate (decompress) the codes in a deflated (compressed) block. |
| * Return an error code or zero if it all goes ok. |
| * |
| * tl, td: literal/length and distance decoder tables |
| * bl, bd: number of bits decoded by tl[] and td[] |
| */ |
| /* called once from inflate_block */ |
| |
| /* map formerly local static variables to globals */ |
| #define ml inflate_codes_ml |
| #define md inflate_codes_md |
| #define bb inflate_codes_bb |
| #define k inflate_codes_k |
| #define w inflate_codes_w |
| #define tl inflate_codes_tl |
| #define td inflate_codes_td |
| #define bl inflate_codes_bl |
| #define bd inflate_codes_bd |
| #define nn inflate_codes_nn |
| #define dd inflate_codes_dd |
| static void inflate_codes_setup(STATE_PARAM unsigned my_bl, unsigned my_bd) |
| { |
| bl = my_bl; |
| bd = my_bd; |
| /* make local copies of globals */ |
| bb = gunzip_bb; /* initialize bit buffer */ |
| k = gunzip_bk; |
| w = gunzip_outbuf_count; /* initialize gunzip_window position */ |
| /* inflate the coded data */ |
| ml = mask_bits[bl]; /* precompute masks for speed */ |
| md = mask_bits[bd]; |
| } |
| /* called once from inflate_get_next_window */ |
| static int inflate_codes(STATE_PARAM_ONLY) |
| { |
| unsigned e; /* table entry flag/number of extra bits */ |
| huft_t *t; /* pointer to table entry */ |
| |
| if (resume_copy) |
| goto do_copy; |
| |
| while (1) { /* do until end of block */ |
| bb = fill_bitbuffer(PASS_STATE bb, &k, bl); |
| t = tl + ((unsigned) bb & ml); |
| e = t->e; |
| if (e > 16) |
| do { |
| if (e == 99) |
| abort_unzip(PASS_STATE_ONLY);; |
| bb >>= t->b; |
| k -= t->b; |
| e -= 16; |
| bb = fill_bitbuffer(PASS_STATE bb, &k, e); |
| t = t->v.t + ((unsigned) bb & mask_bits[e]); |
| e = t->e; |
| } while (e > 16); |
| bb >>= t->b; |
| k -= t->b; |
| if (e == 16) { /* then it's a literal */ |
| gunzip_window[w++] = (unsigned char) t->v.n; |
| if (w == GUNZIP_WSIZE) { |
| gunzip_outbuf_count = w; |
| //flush_gunzip_window(); |
| w = 0; |
| return 1; // We have a block to read |
| } |
| } else { /* it's an EOB or a length */ |
| /* exit if end of block */ |
| if (e == 15) { |
| break; |
| } |
| |
| /* get length of block to copy */ |
| bb = fill_bitbuffer(PASS_STATE bb, &k, e); |
| nn = t->v.n + ((unsigned) bb & mask_bits[e]); |
| bb >>= e; |
| k -= e; |
| |
| /* decode distance of block to copy */ |
| bb = fill_bitbuffer(PASS_STATE bb, &k, bd); |
| t = td + ((unsigned) bb & md); |
| e = t->e; |
| if (e > 16) |
| do { |
| if (e == 99) |
| abort_unzip(PASS_STATE_ONLY); |
| bb >>= t->b; |
| k -= t->b; |
| e -= 16; |
| bb = fill_bitbuffer(PASS_STATE bb, &k, e); |
| t = t->v.t + ((unsigned) bb & mask_bits[e]); |
| e = t->e; |
| } while (e > 16); |
| bb >>= t->b; |
| k -= t->b; |
| bb = fill_bitbuffer(PASS_STATE bb, &k, e); |
| dd = w - t->v.n - ((unsigned) bb & mask_bits[e]); |
| bb >>= e; |
| k -= e; |
| |
| /* do the copy */ |
| do_copy: |
| do { |
| /* Was: nn -= (e = (e = GUNZIP_WSIZE - ((dd &= GUNZIP_WSIZE - 1) > w ? dd : w)) > nn ? nn : e); */ |
| /* Who wrote THAT?? rewritten as: */ |
| dd &= GUNZIP_WSIZE - 1; |
| e = GUNZIP_WSIZE - (dd > w ? dd : w); |
| if (e > nn) e = nn; |
| nn -= e; |
| |
| /* copy to new buffer to prevent possible overwrite */ |
| if (w - dd >= e) { /* (this test assumes unsigned comparison) */ |
| memcpy(gunzip_window + w, gunzip_window + dd, e); |
| w += e; |
| dd += e; |
| } else { |
| /* do it slow to avoid memcpy() overlap */ |
| /* !NOMEMCPY */ |
| do { |
| gunzip_window[w++] = gunzip_window[dd++]; |
| } while (--e); |
| } |
| if (w == GUNZIP_WSIZE) { |
| gunzip_outbuf_count = w; |
| resume_copy = (nn != 0); |
| //flush_gunzip_window(); |
| w = 0; |
| return 1; |
| } |
| } while (nn); |
| resume_copy = 0; |
| } |
| } |
| |
| /* restore the globals from the locals */ |
| gunzip_outbuf_count = w; /* restore global gunzip_window pointer */ |
| gunzip_bb = bb; /* restore global bit buffer */ |
| gunzip_bk = k; |
| |
| /* normally just after call to inflate_codes, but save code by putting it here */ |
| /* free the decoding tables (tl and td), return */ |
| huft_free_all(PASS_STATE_ONLY); |
| |
| /* done */ |
| return 0; |
| } |
| #undef ml |
| #undef md |
| #undef bb |
| #undef k |
| #undef w |
| #undef tl |
| #undef td |
| #undef bl |
| #undef bd |
| #undef nn |
| #undef dd |
| |
| |
| /* called once from inflate_block */ |
| static void inflate_stored_setup(STATE_PARAM int my_n, int my_b, int my_k) |
| { |
| inflate_stored_n = my_n; |
| inflate_stored_b = my_b; |
| inflate_stored_k = my_k; |
| /* initialize gunzip_window position */ |
| inflate_stored_w = gunzip_outbuf_count; |
| } |
| /* called once from inflate_get_next_window */ |
| static int inflate_stored(STATE_PARAM_ONLY) |
| { |
| /* read and output the compressed data */ |
| while (inflate_stored_n--) { |
| inflate_stored_b = fill_bitbuffer(PASS_STATE inflate_stored_b, &inflate_stored_k, 8); |
| gunzip_window[inflate_stored_w++] = (unsigned char) inflate_stored_b; |
| if (inflate_stored_w == GUNZIP_WSIZE) { |
| gunzip_outbuf_count = inflate_stored_w; |
| //flush_gunzip_window(); |
| inflate_stored_w = 0; |
| inflate_stored_b >>= 8; |
| inflate_stored_k -= 8; |
| return 1; /* We have a block */ |
| } |
| inflate_stored_b >>= 8; |
| inflate_stored_k -= 8; |
| } |
| |
| /* restore the globals from the locals */ |
| gunzip_outbuf_count = inflate_stored_w; /* restore global gunzip_window pointer */ |
| gunzip_bb = inflate_stored_b; /* restore global bit buffer */ |
| gunzip_bk = inflate_stored_k; |
| return 0; /* Finished */ |
| } |
| |
| |
| /* |
| * decompress an inflated block |
| * e: last block flag |
| * |
| * GLOBAL VARIABLES: bb, kk, |
| */ |
| /* Return values: -1 = inflate_stored, -2 = inflate_codes */ |
| /* One callsite in inflate_get_next_window */ |
| static int inflate_block(STATE_PARAM smallint *e) |
| { |
| unsigned ll[286 + 30]; /* literal/length and distance code lengths */ |
| unsigned t; /* block type */ |
| unsigned b; /* bit buffer */ |
| unsigned k; /* number of bits in bit buffer */ |
| |
| /* make local bit buffer */ |
| |
| b = gunzip_bb; |
| k = gunzip_bk; |
| |
| /* read in last block bit */ |
| b = fill_bitbuffer(PASS_STATE b, &k, 1); |
| *e = b & 1; |
| b >>= 1; |
| k -= 1; |
| |
| /* read in block type */ |
| b = fill_bitbuffer(PASS_STATE b, &k, 2); |
| t = (unsigned) b & 3; |
| b >>= 2; |
| k -= 2; |
| |
| /* restore the global bit buffer */ |
| gunzip_bb = b; |
| gunzip_bk = k; |
| |
| /* Do we see block type 1 often? Yes! |
| * TODO: fix performance problem (see below) */ |
| //bb_error_msg("blktype %d", t); |
| |
| /* inflate that block type */ |
| switch (t) { |
| case 0: /* Inflate stored */ |
| { |
| unsigned n; /* number of bytes in block */ |
| unsigned b_stored; /* bit buffer */ |
| unsigned k_stored; /* number of bits in bit buffer */ |
| |
| /* make local copies of globals */ |
| b_stored = gunzip_bb; /* initialize bit buffer */ |
| k_stored = gunzip_bk; |
| |
| /* go to byte boundary */ |
| n = k_stored & 7; |
| b_stored >>= n; |
| k_stored -= n; |
| |
| /* get the length and its complement */ |
| b_stored = fill_bitbuffer(PASS_STATE b_stored, &k_stored, 16); |
| n = ((unsigned) b_stored & 0xffff); |
| b_stored >>= 16; |
| k_stored -= 16; |
| |
| b_stored = fill_bitbuffer(PASS_STATE b_stored, &k_stored, 16); |
| if (n != (unsigned) ((~b_stored) & 0xffff)) { |
| abort_unzip(PASS_STATE_ONLY); /* error in compressed data */ |
| } |
| b_stored >>= 16; |
| k_stored -= 16; |
| |
| inflate_stored_setup(PASS_STATE n, b_stored, k_stored); |
| |
| return -1; |
| } |
| case 1: |
| /* Inflate fixed |
| * decompress an inflated type 1 (fixed Huffman codes) block. We should |
| * either replace this with a custom decoder, or at least precompute the |
| * Huffman tables. TODO */ |
| { |
| int i; /* temporary variable */ |
| unsigned bl; /* lookup bits for tl */ |
| unsigned bd; /* lookup bits for td */ |
| /* gcc 4.2.1 is too dumb to reuse stackspace. Moved up... */ |
| //unsigned ll[288]; /* length list for huft_build */ |
| |
| /* set up literal table */ |
| for (i = 0; i < 144; i++) |
| ll[i] = 8; |
| for (; i < 256; i++) |
| ll[i] = 9; |
| for (; i < 280; i++) |
| ll[i] = 7; |
| for (; i < 288; i++) /* make a complete, but wrong code set */ |
| ll[i] = 8; |
| bl = 7; |
| huft_build(ll, 288, 257, cplens, cplext, &inflate_codes_tl, &bl); |
| /* huft_build() never return nonzero - we use known data */ |
| |
| /* set up distance table */ |
| for (i = 0; i < 30; i++) /* make an incomplete code set */ |
| ll[i] = 5; |
| bd = 5; |
| huft_build(ll, 30, 0, cpdist, cpdext, &inflate_codes_td, &bd); |
| |
| /* set up data for inflate_codes() */ |
| inflate_codes_setup(PASS_STATE bl, bd); |
| |
| /* huft_free code moved into inflate_codes */ |
| |
| return -2; |
| } |
| case 2: /* Inflate dynamic */ |
| { |
| enum { dbits = 6 }; /* bits in base distance lookup table */ |
| enum { lbits = 9 }; /* bits in base literal/length lookup table */ |
| |
| huft_t *td; /* distance code table */ |
| unsigned i; /* temporary variables */ |
| unsigned j; |
| unsigned l; /* last length */ |
| unsigned m; /* mask for bit lengths table */ |
| unsigned n; /* number of lengths to get */ |
| unsigned bl; /* lookup bits for tl */ |
| unsigned bd; /* lookup bits for td */ |
| unsigned nb; /* number of bit length codes */ |
| unsigned nl; /* number of literal/length codes */ |
| unsigned nd; /* number of distance codes */ |
| |
| //unsigned ll[286 + 30];/* literal/length and distance code lengths */ |
| unsigned b_dynamic; /* bit buffer */ |
| unsigned k_dynamic; /* number of bits in bit buffer */ |
| |
| /* make local bit buffer */ |
| b_dynamic = gunzip_bb; |
| k_dynamic = gunzip_bk; |
| |
| /* read in table lengths */ |
| b_dynamic = fill_bitbuffer(PASS_STATE b_dynamic, &k_dynamic, 5); |
| nl = 257 + ((unsigned) b_dynamic & 0x1f); /* number of literal/length codes */ |
| |
| b_dynamic >>= 5; |
| k_dynamic -= 5; |
| b_dynamic = fill_bitbuffer(PASS_STATE b_dynamic, &k_dynamic, 5); |
| nd = 1 + ((unsigned) b_dynamic & 0x1f); /* number of distance codes */ |
| |
| b_dynamic >>= 5; |
| k_dynamic -= 5; |
| b_dynamic = fill_bitbuffer(PASS_STATE b_dynamic, &k_dynamic, 4); |
| nb = 4 + ((unsigned) b_dynamic & 0xf); /* number of bit length codes */ |
| |
| b_dynamic >>= 4; |
| k_dynamic -= 4; |
| if (nl > 286 || nd > 30) |
| abort_unzip(PASS_STATE_ONLY); /* bad lengths */ |
| |
| /* read in bit-length-code lengths */ |
| for (j = 0; j < nb; j++) { |
| b_dynamic = fill_bitbuffer(PASS_STATE b_dynamic, &k_dynamic, 3); |
| ll[border[j]] = (unsigned) b_dynamic & 7; |
| b_dynamic >>= 3; |
| k_dynamic -= 3; |
| } |
| for (; j < 19; j++) |
| ll[border[j]] = 0; |
| |
| /* build decoding table for trees - single level, 7 bit lookup */ |
| bl = 7; |
| i = huft_build(ll, 19, 19, NULL, NULL, &inflate_codes_tl, &bl); |
| if (i != 0) { |
| abort_unzip(PASS_STATE_ONLY); //return i; /* incomplete code set */ |
| } |
| |
| /* read in literal and distance code lengths */ |
| n = nl + nd; |
| m = mask_bits[bl]; |
| i = l = 0; |
| while ((unsigned) i < n) { |
| b_dynamic = fill_bitbuffer(PASS_STATE b_dynamic, &k_dynamic, (unsigned)bl); |
| td = inflate_codes_tl + ((unsigned) b_dynamic & m); |
| j = td->b; |
| b_dynamic >>= j; |
| k_dynamic -= j; |
| j = td->v.n; |
| if (j < 16) { /* length of code in bits (0..15) */ |
| ll[i++] = l = j; /* save last length in l */ |
| } else if (j == 16) { /* repeat last length 3 to 6 times */ |
| b_dynamic = fill_bitbuffer(PASS_STATE b_dynamic, &k_dynamic, 2); |
| j = 3 + ((unsigned) b_dynamic & 3); |
| b_dynamic >>= 2; |
| k_dynamic -= 2; |
| if ((unsigned) i + j > n) { |
| abort_unzip(PASS_STATE_ONLY); //return 1; |
| } |
| while (j--) { |
| ll[i++] = l; |
| } |
| } else if (j == 17) { /* 3 to 10 zero length codes */ |
| b_dynamic = fill_bitbuffer(PASS_STATE b_dynamic, &k_dynamic, 3); |
| j = 3 + ((unsigned) b_dynamic & 7); |
| b_dynamic >>= 3; |
| k_dynamic -= 3; |
| if ((unsigned) i + j > n) { |
| abort_unzip(PASS_STATE_ONLY); //return 1; |
| } |
| while (j--) { |
| ll[i++] = 0; |
| } |
| l = 0; |
| } else { /* j == 18: 11 to 138 zero length codes */ |
| b_dynamic = fill_bitbuffer(PASS_STATE b_dynamic, &k_dynamic, 7); |
| j = 11 + ((unsigned) b_dynamic & 0x7f); |
| b_dynamic >>= 7; |
| k_dynamic -= 7; |
| if ((unsigned) i + j > n) { |
| abort_unzip(PASS_STATE_ONLY); //return 1; |
| } |
| while (j--) { |
| ll[i++] = 0; |
| } |
| l = 0; |
| } |
| } |
| |
| /* free decoding table for trees */ |
| huft_free(inflate_codes_tl); |
| |
| /* restore the global bit buffer */ |
| gunzip_bb = b_dynamic; |
| gunzip_bk = k_dynamic; |
| |
| /* build the decoding tables for literal/length and distance codes */ |
| bl = lbits; |
| |
| i = huft_build(ll, nl, 257, cplens, cplext, &inflate_codes_tl, &bl); |
| if (i != 0) |
| abort_unzip(PASS_STATE_ONLY); |
| bd = dbits; |
| i = huft_build(ll + nl, nd, 0, cpdist, cpdext, &inflate_codes_td, &bd); |
| if (i != 0) |
| abort_unzip(PASS_STATE_ONLY); |
| |
| /* set up data for inflate_codes() */ |
| inflate_codes_setup(PASS_STATE bl, bd); |
| |
| /* huft_free code moved into inflate_codes */ |
| |
| return -2; |
| } |
| default: |
| abort_unzip(PASS_STATE_ONLY); |
| } |
| } |
| |
| /* Two callsites, both in inflate_get_next_window */ |
| static void calculate_gunzip_crc(STATE_PARAM_ONLY) |
| { |
| int n; |
| for (n = 0; n < gunzip_outbuf_count; n++) { |
| gunzip_crc = gunzip_crc_table[((int) gunzip_crc ^ (gunzip_window[n])) & 0xff] ^ (gunzip_crc >> 8); |
| } |
| gunzip_bytes_out += gunzip_outbuf_count; |
| } |
| |
| /* One callsite in inflate_unzip_internal */ |
| static int inflate_get_next_window(STATE_PARAM_ONLY) |
| { |
| gunzip_outbuf_count = 0; |
| |
| while (1) { |
| int ret; |
| |
| if (need_another_block) { |
| if (end_reached) { |
| calculate_gunzip_crc(PASS_STATE_ONLY); |
| end_reached = 0; |
| /* NB: need_another_block is still set */ |
| return 0; /* Last block */ |
| } |
| method = inflate_block(PASS_STATE &end_reached); |
| need_another_block = 0; |
| } |
| |
| switch (method) { |
| case -1: |
| ret = inflate_stored(PASS_STATE_ONLY); |
| break; |
| case -2: |
| ret = inflate_codes(PASS_STATE_ONLY); |
| break; |
| default: /* cannot happen */ |
| abort_unzip(PASS_STATE_ONLY); |
| } |
| |
| if (ret == 1) { |
| calculate_gunzip_crc(PASS_STATE_ONLY); |
| return 1; /* more data left */ |
| } |
| need_another_block = 1; /* end of that block */ |
| } |
| /* Doesnt get here */ |
| } |
| |
| |
| /* Called from unpack_gz_stream() and inflate_unzip() */ |
| static USE_DESKTOP(long long) int |
| inflate_unzip_internal(STATE_PARAM int in, int out) |
| { |
| USE_DESKTOP(long long) int n = 0; |
| ssize_t nwrote; |
| |
| /* Allocate all global buffers (for DYN_ALLOC option) */ |
| gunzip_window = xmalloc(GUNZIP_WSIZE); |
| gunzip_outbuf_count = 0; |
| gunzip_bytes_out = 0; |
| gunzip_src_fd = in; |
| |
| /* (re) initialize state */ |
| method = -1; |
| need_another_block = 1; |
| resume_copy = 0; |
| gunzip_bk = 0; |
| gunzip_bb = 0; |
| |
| /* Create the crc table */ |
| gunzip_crc_table = crc32_filltable(NULL, 0); |
| gunzip_crc = ~0; |
| |
| error_msg = "corrupted data"; |
| if (setjmp(error_jmp)) { |
| /* Error from deep inside zip machinery */ |
| n = -1; |
| goto ret; |
| } |
| |
| while (1) { |
| int r = inflate_get_next_window(PASS_STATE_ONLY); |
| nwrote = full_write(out, gunzip_window, gunzip_outbuf_count); |
| if (nwrote != gunzip_outbuf_count) { |
| bb_perror_msg("write"); |
| n = -1; |
| goto ret; |
| } |
| USE_DESKTOP(n += nwrote;) |
| if (r == 0) break; |
| } |
| |
| /* Store unused bytes in a global buffer so calling applets can access it */ |
| if (gunzip_bk >= 8) { |
| /* Undo too much lookahead. The next read will be byte aligned |
| * so we can discard unused bits in the last meaningful byte. */ |
| bytebuffer_offset--; |
| bytebuffer[bytebuffer_offset] = gunzip_bb & 0xff; |
| gunzip_bb >>= 8; |
| gunzip_bk -= 8; |
| } |
| ret: |
| /* Cleanup */ |
| free(gunzip_window); |
| free(gunzip_crc_table); |
| return n; |
| } |
| |
| |
| /* External entry points */ |
| |
| /* For unzip */ |
| |
| USE_DESKTOP(long long) int |
| inflate_unzip(inflate_unzip_result *res, unsigned bufsize, int in, int out) |
| { |
| USE_DESKTOP(long long) int n; |
| DECLARE_STATE; |
| |
| ALLOC_STATE; |
| |
| bytebuffer_max = bufsize + 4; |
| bytebuffer_offset = 4; |
| bytebuffer = xmalloc(bytebuffer_max); |
| n = inflate_unzip_internal(PASS_STATE in, out); |
| free(bytebuffer); |
| |
| res->crc = gunzip_crc; |
| res->bytes_out = gunzip_bytes_out; |
| DEALLOC_STATE; |
| return n; |
| } |
| |
| |
| /* For gunzip */ |
| |
| /* helpers first */ |
| |
| /* Top up the input buffer with at least n bytes. */ |
| static int top_up(STATE_PARAM unsigned n) |
| { |
| int count = bytebuffer_size - bytebuffer_offset; |
| |
| if (count < n) { |
| memmove(bytebuffer, &bytebuffer[bytebuffer_offset], count); |
| bytebuffer_offset = 0; |
| bytebuffer_size = full_read(gunzip_src_fd, &bytebuffer[count], bytebuffer_max - count); |
| if ((int)bytebuffer_size < 0) { |
| bb_error_msg("read error"); |
| return 0; |
| } |
| bytebuffer_size += count; |
| if (bytebuffer_size < n) |
| return 0; |
| } |
| return 1; |
| } |
| |
| static uint16_t buffer_read_le_u16(STATE_PARAM_ONLY) |
| { |
| uint16_t res; |
| #if BB_LITTLE_ENDIAN |
| /* gcc 4.2.1 is very clever */ |
| memcpy(&res, &bytebuffer[bytebuffer_offset], 2); |
| #else |
| res = bytebuffer[bytebuffer_offset]; |
| res |= bytebuffer[bytebuffer_offset + 1] << 8; |
| #endif |
| bytebuffer_offset += 2; |
| return res; |
| } |
| |
| static uint32_t buffer_read_le_u32(STATE_PARAM_ONLY) |
| { |
| uint32_t res; |
| #if BB_LITTLE_ENDIAN |
| memcpy(&res, &bytebuffer[bytebuffer_offset], 4); |
| #else |
| res = bytebuffer[bytebuffer_offset]; |
| res |= bytebuffer[bytebuffer_offset + 1] << 8; |
| res |= bytebuffer[bytebuffer_offset + 2] << 16; |
| res |= bytebuffer[bytebuffer_offset + 3] << 24; |
| #endif |
| bytebuffer_offset += 4; |
| return res; |
| } |
| |
| static int check_header_gzip(STATE_PARAM_ONLY) |
| { |
| union { |
| unsigned char raw[8]; |
| struct { |
| uint8_t gz_method; |
| uint8_t flags; |
| //uint32_t mtime; - unused fields |
| //uint8_t xtra_flags; |
| //uint8_t os_flags; |
| } formatted; /* packed */ |
| } header; |
| |
| /* |
| * Rewind bytebuffer. We use the beginning because the header has 8 |
| * bytes, leaving enough for unwinding afterwards. |
| */ |
| bytebuffer_size -= bytebuffer_offset; |
| memmove(bytebuffer, &bytebuffer[bytebuffer_offset], bytebuffer_size); |
| bytebuffer_offset = 0; |
| |
| if (!top_up(PASS_STATE 8)) |
| return 0; |
| memcpy(header.raw, &bytebuffer[bytebuffer_offset], 8); |
| bytebuffer_offset += 8; |
| |
| /* Check the compression method */ |
| if (header.formatted.gz_method != 8) { |
| return 0; |
| } |
| |
| if (header.formatted.flags & 0x04) { |
| /* bit 2 set: extra field present */ |
| unsigned extra_short; |
| |
| if (!top_up(PASS_STATE 2)) |
| return 0; |
| extra_short = buffer_read_le_u16(PASS_STATE_ONLY); |
| if (!top_up(PASS_STATE extra_short)) |
| return 0; |
| /* Ignore extra field */ |
| bytebuffer_offset += extra_short; |
| } |
| |
| /* Discard original name and file comment if any */ |
| /* bit 3 set: original file name present */ |
| /* bit 4 set: file comment present */ |
| if (header.formatted.flags & 0x18) { |
| while (1) { |
| do { |
| if (!top_up(PASS_STATE 1)) |
| return 0; |
| } while (bytebuffer[bytebuffer_offset++] != 0); |
| if ((header.formatted.flags & 0x18) != 0x18) |
| break; |
| header.formatted.flags &= ~0x18; |
| } |
| } |
| |
| /* Read the header checksum */ |
| if (header.formatted.flags & 0x02) { |
| if (!top_up(PASS_STATE 2)) |
| return 0; |
| bytebuffer_offset += 2; |
| } |
| return 1; |
| } |
| |
| USE_DESKTOP(long long) int |
| unpack_gz_stream(int in, int out) |
| { |
| uint32_t v32; |
| USE_DESKTOP(long long) int n; |
| DECLARE_STATE; |
| |
| n = 0; |
| |
| ALLOC_STATE; |
| bytebuffer_max = 0x8000; |
| bytebuffer = xmalloc(bytebuffer_max); |
| gunzip_src_fd = in; |
| |
| again: |
| if (!check_header_gzip(PASS_STATE_ONLY)) { |
| bb_error_msg("corrupted data"); |
| n = -1; |
| goto ret; |
| } |
| n += inflate_unzip_internal(PASS_STATE in, out); |
| if (n < 0) |
| goto ret; |
| |
| if (!top_up(PASS_STATE 8)) { |
| bb_error_msg("corrupted data"); |
| n = -1; |
| goto ret; |
| } |
| |
| /* Validate decompression - crc */ |
| v32 = buffer_read_le_u32(PASS_STATE_ONLY); |
| if ((~gunzip_crc) != v32) { |
| bb_error_msg("crc error"); |
| n = -1; |
| goto ret; |
| } |
| |
| /* Validate decompression - size */ |
| v32 = buffer_read_le_u32(PASS_STATE_ONLY); |
| if ((uint32_t)gunzip_bytes_out != v32) { |
| bb_error_msg("incorrect length"); |
| n = -1; |
| } |
| |
| if (!top_up(PASS_STATE 2)) |
| goto ret; /* EOF */ |
| |
| if (bytebuffer[bytebuffer_offset] == 0x1f |
| && bytebuffer[bytebuffer_offset + 1] == 0x8b |
| ) { |
| bytebuffer_offset += 2; |
| goto again; |
| } |
| /* GNU gzip says: */ |
| /*bb_error_msg("decompression OK, trailing garbage ignored");*/ |
| |
| ret: |
| free(bytebuffer); |
| DEALLOC_STATE; |
| return n; |
| } |