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https://github.com/sheumann/hush.git
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split inflate_xx_setup() subroutines from inflate_xx()
This commit is contained in:
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cd42cb8df0
commit
d1a19affeb
@ -45,22 +45,25 @@ typedef struct huft_s {
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} v;
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} huft_t;
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enum {
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/* gunzip_window size--must be a power of two, and
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* at least 32K for zip's deflate method */
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GUNZIP_WSIZE = 0x8000,
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/* If BMAX needs to be larger than 16, then h and x[] should be ulg. */
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BMAX = 16, /* maximum bit length of any code (16 for explode) */
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N_MAX = 288, /* maximum number of codes in any set */
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};
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static off_t gunzip_bytes_out; /* number of output bytes */
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static uint32_t gunzip_crc;
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static int gunzip_src_fd;
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static unsigned gunzip_outbuf_count; /* bytes in output buffer */
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/* gunzip_window size--must be a power of two, and
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* at least 32K for zip's deflate method */
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enum { gunzip_wsize = 0x8000 };
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static unsigned char *gunzip_window;
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static uint32_t *gunzip_crc_table;
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/* If BMAX needs to be larger than 16, then h and x[] should be ulg. */
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#define BMAX 16 /* maximum bit length of any code (16 for explode) */
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#define N_MAX 288 /* maximum number of codes in any set */
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/* bitbuffer */
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static unsigned gunzip_bb; /* bit buffer */
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@ -135,19 +138,16 @@ static unsigned fill_bitbuffer(unsigned bitbuffer, unsigned *current, const unsi
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* each table.
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* t: table to free
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*/
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static int huft_free(huft_t * t)
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static void huft_free(huft_t * p)
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{
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huft_t *p;
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huft_t *q;
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/* Go through linked list, freeing from the malloced (t[-1]) address. */
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p = t;
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while (p != (huft_t *) NULL) {
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while (p) {
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q = (--p)->v.t;
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free((char *) p);
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free(p);
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p = q;
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}
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return 0;
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}
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/* Given a list of code lengths and a maximum table size, make a set of
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@ -339,6 +339,7 @@ static int huft_build(unsigned *b, const unsigned n,
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return y != 0 && g != 1;
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}
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/*
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* inflate (decompress) the codes in a deflated (compressed) block.
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* Return an error code or zero if it all goes ok.
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@ -346,106 +347,116 @@ static int huft_build(unsigned *b, const unsigned n,
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* tl, td: literal/length and distance decoder tables
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* bl, bd: number of bits decoded by tl[] and td[]
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*/
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/* called with setup==1 once from inflate_block */
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/* called once with setup==0 from inflate_get_next_window */
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static int inflate_codes(huft_t * my_tl, huft_t * my_td, const unsigned my_bl, const unsigned my_bd, int setup)
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/* called once from inflate_block */
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#define ml inflate_codes_ml
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#define md inflate_codes_md
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#define bb inflate_codes_bb
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#define k inflate_codes_k
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#define w inflate_codes_w
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#define tl inflate_codes_tl
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#define td inflate_codes_td
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#define bl inflate_codes_bl
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#define bd inflate_codes_bd
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static unsigned ml, md; /* masks for bl and bd bits */
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static unsigned bb; /* bit buffer */
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static unsigned k; /* number of bits in bit buffer */
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static unsigned w; /* current gunzip_window position */
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static huft_t *tl, *td;
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static unsigned bl, bd;
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static int resumeCopy; /* = 0; */
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static void inflate_codes_setup(huft_t * my_tl, huft_t * my_td, const unsigned my_bl, const unsigned my_bd)
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{
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static unsigned e; /* table entry flag/number of extra bits */
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static unsigned n, d; /* length and index for copy */
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static unsigned w; /* current gunzip_window position */
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static huft_t *t; /* pointer to table entry */
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static unsigned ml, md; /* masks for bl and bd bits */
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static unsigned b; /* bit buffer */
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static unsigned k; /* number of bits in bit buffer */
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static huft_t *tl, *td;
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static unsigned bl, bd;
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static int resumeCopy = 0;
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if (setup) { // 1st time we are called, copy in variables
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tl = my_tl;
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td = my_td;
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bl = my_bl;
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bd = my_bd;
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/* make local copies of globals */
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b = gunzip_bb; /* initialize bit buffer */
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k = gunzip_bk;
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w = gunzip_outbuf_count; /* initialize gunzip_window position */
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/* inflate the coded data */
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ml = mask_bits[bl]; /* precompute masks for speed */
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md = mask_bits[bd];
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return 0; // Don't actually do anything the first time
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}
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tl = my_tl;
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td = my_td;
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bl = my_bl;
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bd = my_bd;
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/* make local copies of globals */
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bb = gunzip_bb; /* initialize bit buffer */
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k = gunzip_bk;
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w = gunzip_outbuf_count; /* initialize gunzip_window position */
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/* inflate the coded data */
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ml = mask_bits[bl]; /* precompute masks for speed */
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md = mask_bits[bd];
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}
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/* called once from inflate_get_next_window */
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static int inflate_codes(void)
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{
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unsigned e; /* table entry flag/number of extra bits */
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huft_t *t; /* pointer to table entry */
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if (resumeCopy) goto do_copy;
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while (1) { /* do until end of block */
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b = fill_bitbuffer(b, &k, bl);
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t = tl + ((unsigned) b & ml);
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bb = fill_bitbuffer(bb, &k, bl);
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t = tl + ((unsigned) bb & ml);
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e = t->e;
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if (e > 16)
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do {
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if (e == 99) {
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bb_error_msg_and_die("inflate_codes error 1");
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}
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b >>= t->b;
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bb >>= t->b;
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k -= t->b;
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e -= 16;
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b = fill_bitbuffer(b, &k, e);
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t = t->v.t + ((unsigned) b & mask_bits[e]);
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bb = fill_bitbuffer(bb, &k, e);
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t = t->v.t + ((unsigned) bb & mask_bits[e]);
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e = t->e;
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} while (e > 16);
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b >>= t->b;
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bb >>= t->b;
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k -= t->b;
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if (e == 16) { /* then it's a literal */
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gunzip_window[w++] = (unsigned char) t->v.n;
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if (w == gunzip_wsize) {
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gunzip_outbuf_count = (w);
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if (w == GUNZIP_WSIZE) {
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gunzip_outbuf_count = w;
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//flush_gunzip_window();
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w = 0;
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return 1; // We have a block to read
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}
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} else { /* it's an EOB or a length */
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/* length and index for copy */
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unsigned n = n; /* for gcc */
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unsigned d = d; /* for gcc */
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/* exit if end of block */
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if (e == 15) {
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break;
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}
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/* get length of block to copy */
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b = fill_bitbuffer(b, &k, e);
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n = t->v.n + ((unsigned) b & mask_bits[e]);
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b >>= e;
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bb = fill_bitbuffer(bb, &k, e);
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n = t->v.n + ((unsigned) bb & mask_bits[e]);
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bb >>= e;
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k -= e;
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/* decode distance of block to copy */
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b = fill_bitbuffer(b, &k, bd);
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t = td + ((unsigned) b & md);
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bb = fill_bitbuffer(bb, &k, bd);
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t = td + ((unsigned) bb & md);
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e = t->e;
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if (e > 16)
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do {
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if (e == 99)
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bb_error_msg_and_die("inflate_codes error 2");
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b >>= t->b;
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bb >>= t->b;
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k -= t->b;
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e -= 16;
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b = fill_bitbuffer(b, &k, e);
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t = t->v.t + ((unsigned) b & mask_bits[e]);
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bb = fill_bitbuffer(bb, &k, e);
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t = t->v.t + ((unsigned) bb & mask_bits[e]);
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e = t->e;
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} while (e > 16);
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b >>= t->b;
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bb >>= t->b;
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k -= t->b;
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b = fill_bitbuffer(b, &k, e);
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d = w - t->v.n - ((unsigned) b & mask_bits[e]);
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b >>= e;
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bb = fill_bitbuffer(bb, &k, e);
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d = w - t->v.n - ((unsigned) bb & mask_bits[e]);
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bb >>= e;
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k -= e;
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/* do the copy */
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do_copy:
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do {
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/* Was: n -= (e = (e = gunzip_wsize - ((d &= gunzip_wsize - 1) > w ? d : w)) > n ? n : e); */
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/* Was: n -= (e = (e = GUNZIP_WSIZE - ((d &= GUNZIP_WSIZE - 1) > w ? d : w)) > n ? n : e); */
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/* Who wrote THAT?? rewritten as: */
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d &= gunzip_wsize - 1;
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e = gunzip_wsize - (d > w ? d : w);
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d &= GUNZIP_WSIZE - 1;
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e = GUNZIP_WSIZE - (d > w ? d : w);
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if (e > n) e = n;
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n -= e;
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@ -461,8 +472,8 @@ static int inflate_codes(huft_t * my_tl, huft_t * my_td, const unsigned my_bl, c
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gunzip_window[w++] = gunzip_window[d++];
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} while (--e);
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}
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if (w == gunzip_wsize) {
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gunzip_outbuf_count = (w);
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if (w == GUNZIP_WSIZE) {
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gunzip_outbuf_count = w;
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resumeCopy = (n != 0);
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//flush_gunzip_window();
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w = 0;
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@ -474,8 +485,8 @@ static int inflate_codes(huft_t * my_tl, huft_t * my_td, const unsigned my_bl, c
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}
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/* restore the globals from the locals */
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gunzip_outbuf_count = w; /* restore global gunzip_window pointer */
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gunzip_bb = b; /* restore global bit buffer */
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gunzip_outbuf_count = w; /* restore global gunzip_window pointer */
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gunzip_bb = bb; /* restore global bit buffer */
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gunzip_bk = k;
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/* normally just after call to inflate_codes, but save code by putting it here */
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@ -486,44 +497,54 @@ static int inflate_codes(huft_t * my_tl, huft_t * my_td, const unsigned my_bl, c
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/* done */
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return 0;
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}
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#undef ml
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#undef md
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#undef bb
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#undef k
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#undef w
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#undef tl
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#undef td
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#undef bl
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#undef bd
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/* called once (setup==1) from inflate_block */
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/* and once (setup==0) from inflate_get_next_window */
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static int inflate_stored(int my_n, int my_b_stored, int my_k_stored, int setup)
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static unsigned inflate_stored_n, inflate_stored_b, inflate_stored_k, inflate_stored_w;
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/* called once from inflate_block */
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static void inflate_stored_setup(int my_n, int my_b, int my_k)
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{
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inflate_stored_n = my_n;
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inflate_stored_b = my_b;
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inflate_stored_k = my_k;
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/* initialize gunzip_window position */
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inflate_stored_w = gunzip_outbuf_count;
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}
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/* called once from inflate_get_next_window */
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static int inflate_stored(void)
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{
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static unsigned n, b_stored, k_stored, w;
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if (setup) {
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n = my_n;
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b_stored = my_b_stored;
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k_stored = my_k_stored;
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w = gunzip_outbuf_count; /* initialize gunzip_window position */
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return 0; // Don't do anything first time
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}
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/* read and output the compressed data */
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while (n--) {
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b_stored = fill_bitbuffer(b_stored, &k_stored, 8);
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gunzip_window[w++] = (unsigned char) b_stored;
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if (w == gunzip_wsize) {
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gunzip_outbuf_count = (w);
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while (inflate_stored_n--) {
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inflate_stored_b = fill_bitbuffer(inflate_stored_b, &inflate_stored_k, 8);
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gunzip_window[inflate_stored_w++] = (unsigned char) inflate_stored_b;
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if (inflate_stored_w == GUNZIP_WSIZE) {
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gunzip_outbuf_count = inflate_stored_w;
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//flush_gunzip_window();
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w = 0;
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b_stored >>= 8;
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k_stored -= 8;
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inflate_stored_w = 0;
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inflate_stored_b >>= 8;
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inflate_stored_k -= 8;
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return 1; // We have a block
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}
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b_stored >>= 8;
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k_stored -= 8;
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inflate_stored_b >>= 8;
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inflate_stored_k -= 8;
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}
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/* restore the globals from the locals */
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gunzip_outbuf_count = w; /* restore global gunzip_window pointer */
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gunzip_bb = b_stored; /* restore global bit buffer */
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gunzip_bk = k_stored;
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gunzip_outbuf_count = inflate_stored_w; /* restore global gunzip_window pointer */
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gunzip_bb = inflate_stored_b; /* restore global bit buffer */
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gunzip_bk = inflate_stored_k;
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return 0; // Finished
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}
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/*
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* decompress an inflated block
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* e: last block flag
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@ -589,7 +610,8 @@ static int inflate_block(int *e)
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b_stored >>= 16;
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k_stored -= 16;
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inflate_stored(n, b_stored, k_stored, 1); // Setup inflate_stored
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inflate_stored_setup(n, b_stored, k_stored); // Setup inflate_stored
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return -1;
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}
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case 1:
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@ -636,7 +658,7 @@ static int inflate_block(int *e)
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}
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/* decompress until an end-of-block code */
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inflate_codes(tl, td, bl, bd, 1); // Setup inflate_codes
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inflate_codes_setup(tl, td, bl, bd); // Setup inflate_codes
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/* huft_free code moved into inflate_codes */
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@ -790,7 +812,7 @@ static int inflate_block(int *e)
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}
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/* decompress until an end-of-block code */
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inflate_codes(tl, td, bl, bd, 1); // Setup inflate_codes
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inflate_codes_setup(tl, td, bl, bd); // Setup inflate_codes
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/* huft_free code moved into inflate_codes */
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@ -812,7 +834,7 @@ static void calculate_gunzip_crc(void)
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gunzip_bytes_out += gunzip_outbuf_count;
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}
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/* One callsite in inflate_unzip */
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/* One callsite in inflate_unzip_internal */
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static int inflate_get_next_window(void)
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{
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static int method = -1; // Method == -1 for stored, -2 for codes
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@ -825,7 +847,7 @@ static int inflate_get_next_window(void)
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int ret;
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if (needAnotherBlock) {
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if(e) {
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if (e) {
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calculate_gunzip_crc();
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e = 0;
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needAnotherBlock = 1;
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@ -836,32 +858,36 @@ static int inflate_get_next_window(void)
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}
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switch (method) {
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case -1: ret = inflate_stored(0,0,0,0);
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break;
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case -2: ret = inflate_codes(0,0,0,0,0);
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break;
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default: bb_error_msg_and_die("inflate error %d", method);
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case -1:
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ret = inflate_stored();
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break;
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case -2:
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ret = inflate_codes();
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break;
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default:
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bb_error_msg_and_die("inflate error %d", method);
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}
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if (ret == 1) {
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calculate_gunzip_crc();
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return 1; // More data left
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} else needAnotherBlock = 1; // End of that block
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} else
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needAnotherBlock = 1; // End of that block
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}
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/* Doesnt get here */
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}
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/* Called from inflate_gunzip() and archival/unzip.c */
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/* Called from inflate_gunzip() and inflate_unzip() */
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/* NB: bytebuffer is allocated here but freeing it is left to the caller! */
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static USE_DESKTOP(long long) int
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inflate_unzip_internal(int in, int out)
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{
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USE_DESKTOP(long long total = 0;)
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USE_DESKTOP(long long) int n = 0;
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ssize_t nwrote;
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typedef void (*sig_type) (int);
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/* Allocate all global buffers (for DYN_ALLOC option) */
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gunzip_window = xmalloc(gunzip_wsize);
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gunzip_window = xmalloc(GUNZIP_WSIZE);
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gunzip_outbuf_count = 0;
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gunzip_bytes_out = 0;
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gunzip_src_fd = in;
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@ -878,20 +904,17 @@ inflate_unzip_internal(int in, int out)
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bytebuffer = xmalloc(bytebuffer_max);
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while (1) {
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int ret = inflate_get_next_window();
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int r = inflate_get_next_window();
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nwrote = full_write(out, gunzip_window, gunzip_outbuf_count);
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if (nwrote != gunzip_outbuf_count) {
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bb_perror_msg("write");
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return -1;
|
||||
n = -1;
|
||||
goto ret;
|
||||
}
|
||||
USE_DESKTOP(total += nwrote;)
|
||||
if (ret == 0) break;
|
||||
USE_DESKTOP(n += nwrote;)
|
||||
if (r == 0) break;
|
||||
}
|
||||
|
||||
/* Cleanup */
|
||||
free(gunzip_window);
|
||||
free(gunzip_crc_table);
|
||||
|
||||
/* 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
|
||||
@ -901,7 +924,11 @@ inflate_unzip_internal(int in, int out)
|
||||
gunzip_bb >>= 8;
|
||||
gunzip_bk -= 8;
|
||||
}
|
||||
return USE_DESKTOP(total) + 0;
|
||||
ret:
|
||||
/* Cleanup */
|
||||
free(gunzip_window);
|
||||
free(gunzip_crc_table);
|
||||
return n;
|
||||
}
|
||||
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user