applying fixes from:

0000142: unzip enhancements

archival/libunarchive/decompress_unzip.c

@@ -16,6 +16,11 @@
  *
  * 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
+ *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
@@ -116,26 +121,26 @@ static const unsigned short mask_bits[] = {
 /* Copy lengths for literal codes 257..285 */
 static const unsigned short cplens[] = {
 	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
+	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 unsigned char cplext[] = {
 	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
+	5, 5, 5, 0, 99, 99
 };						/* 99==invalid */
 
 /* Copy offsets for distance codes 0..29 */
 static const unsigned short cpdist[] = {
 	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
+	769, 1025, 1537, 2049, 3073, 4097, 6145, 8193, 12289, 16385, 24577
 };
 
 /* Extra bits for distance codes */
 static const unsigned char cpdext[] = {
 	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
+	11, 11, 12, 12, 13, 13
 };
 
 /* Tables for deflate from PKZIP's appnote.txt. */
@@ -187,8 +192,8 @@ static void make_gunzip_crc_table(void)
 				table_entry = (table_entry >> 1) ^ poly;
 			} else {
 				table_entry >>= 1;
-	}
+			}
-	}
+		}
 		gunzip_crc_table[i] = table_entry;
 	}
 }
@@ -228,70 +233,59 @@ static int huft_free(huft_t * t)
  * t:	result: starting table
  * m:	maximum lookup bits, returns actual
  */
-static int huft_build(unsigned int *b, const unsigned int n,
+int huft_build(unsigned int *b, const unsigned int n,
-					  const unsigned int s, const unsigned short *d,
+			   const unsigned int s, const unsigned short *d,
-					  const unsigned char *e, huft_t ** t, int *m)
+			   const unsigned char *e, huft_t ** t, int *m)
 {
-	unsigned a;			/* counter for codes of length k */
+	unsigned a;				/* counter for codes of length k */
 	unsigned c[BMAX + 1];	/* bit length count table */
-	unsigned f;			/* i repeats in table every f entries */
+	unsigned eob_len;		/* length of end-of-block code (value 256) */
-	int g;				/* maximum code length */
+	unsigned f;				/* i repeats in table every f entries */
-	int h;				/* table level */
+	int g;					/* maximum code length */
+	int h;					/* table level */
 	register unsigned i;	/* counter, current code */
 	register unsigned j;	/* counter */
-	register int k;		/* number of bits in current code */
+	register int k;			/* number of bits in current code */
-	int l;				/* bits per table (returned in m) */
 	register unsigned *p;	/* pointer into c[], b[], or v[] */
-	register huft_t *q;	/* points to current table */
+	register huft_t *q;		/* points to current table */
-	huft_t r;			/* table entry for structure assignment */
+	huft_t r;				/* table entry for structure assignment */
-	huft_t *u[BMAX];	/* table stack */
+	huft_t *u[BMAX];		/* table stack */
-	unsigned v[N_MAX];	/* values in order of bit length */
+	unsigned v[N_MAX];		/* values in order of bit length */
-	register int w;		/* bits before this table == (l * h) */
+	int ws[BMAX+1];			/* bits decoded stack */
+	register int w;			/* bits decoded */
 	unsigned x[BMAX + 1];	/* bit offsets, then code stack */
-	unsigned *xp;		/* pointer into x */
+	unsigned *xp;			/* pointer into x */
-	int y;				/* number of dummy codes added */
+	int y;					/* number of dummy codes added */
-	unsigned z;			/* number of entries in current table */
+	unsigned z;				/* number of entries in current table */
+
+	/* Length of EOB code, if any */
+	eob_len = n > 256 ? b[256] : BMAX;
 
 	/* Generate counts for each bit length */
-	memset((void *) (c), 0, sizeof(c));
+	memset((void *)c, 0, sizeof(c));
 	p = b;
 	i = n;
 	do {
-		c[*p]++;		/* assume all entries <= BMAX */
+		c[*p]++; /* assume all entries <= BMAX */
-		p++;			/* Can't combine with above line (Solaris bug) */
+		p++; /* Can't combine with above line (Solaris bug) */
 	} while (--i);
-	if (c[0] == n) {	/* null input--all zero length codes */
+	if (c[0] == n) { /* null input--all zero length codes */
 		*t = (huft_t *) NULL;
 		*m = 0;
 		return 0;
 	}
 
 	/* Find minimum and maximum length, bound *m by those */
-	l = *m;
+	for (j = 1; (c[j] == 0) && (j <= BMAX); j++);
-	for (j = 1; j <= BMAX; j++) {
+	k = j; /* minimum code length */
-		if (c[j]) {
+	for (i = BMAX; (c[i] == 0) && i; i--);
-			break;
+	g = i; /* maximum code length */
-		}
+	*m = (*m < j) ? j : ((*m > i) ? i : *m);
-	}
-	k = j;				/* minimum code length */
-	if ((unsigned) l < j) {
-		l = j;
-	}
-	for (i = BMAX; i; i--) {
-		if (c[i]) {
-			break;
-		}
-	}
-	g = i;				/* maximum code length */
-	if ((unsigned) l > i) {
-		l = i;
-	}
-	*m = l;
 
 	/* Adjust last length count to fill out codes, if needed */
 	for (y = 1 << j; j < i; j++, y <<= 1) {
 		if ((y -= c[j]) < 0) {
-			return 2;	/* bad input: more codes than bits */
+			return 2; /* bad input: more codes than bits */
 		}
 	}
 	if ((y -= c[i]) < 0) {
@@ -303,7 +297,7 @@ static int huft_build(unsigned int *b, const unsigned int n,
 	x[1] = j = 0;
 	p = c + 1;
 	xp = x + 2;
-	while (--i) {		/* note that i == g from above */
+	while (--i) { /* note that i == g from above */
 		*xp++ = (j += *p++);
 	}
 
@@ -317,13 +311,13 @@ static int huft_build(unsigned int *b, const unsigned int n,
 	} while (++i < n);
 
 	/* Generate the Huffman codes and for each, make the table entries */
-	x[0] = i = 0;		/* first Huffman code is zero */
+	x[0] = i = 0;			/* first Huffman code is zero */
-	p = v;				/* grab values in bit order */
+	p = v;					/* grab values in bit order */
-	h = -1;				/* no tables yet--level -1 */
+	h = -1;					/* no tables yet--level -1 */
-	w = -l;				/* bits decoded == (l * h) */
+	w = ws[0] = 0;			/* bits decoded */
 	u[0] = (huft_t *) NULL;	/* just to keep compilers happy */
 	q = (huft_t *) NULL;	/* ditto */
-	z = 0;				/* ditto */
+	z = 0;					/* ditto */
 
 	/* go through the bit lengths (k already is bits in shortest code) */
 	for (; k <= g; k++) {
@@ -331,52 +325,52 @@ static int huft_build(unsigned int *b, const unsigned int n,
 		while (a--) {
 			/* here i is the Huffman code of length k bits for value *p */
 			/* make tables up to required level */
-			while (k > w + l) {
+			while (k > ws[h + 1]) {
-				h++;
+				w = ws[++h];
-				w += l;	/* previous table always l bits */
 
-				/* compute minimum size table less than or equal to l bits */
+				/* compute minimum size table less than or equal to *m bits */
-				z = (z = g - w) > (unsigned) l ? l : z;	/* upper limit on table size */
+				z = (z = g - w) > *m ? *m : z; /* upper limit on table size */
-				if ((f = 1 << (j = k - w)) > a + 1) {	/* try a k-w bit table *//* too few codes for k-w bit table */
+				if ((f = 1 << (j = k - w)) > a + 1) { /* try a k-w bit table */
-					f -= a + 1;	/* deduct codes from patterns left */
+					/* 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 */
+					while (++j < z) { /* try smaller tables up to z bits */
 						if ((f <<= 1) <= *++xp) {
-							break;	/* enough codes to use up j bits */
+							break; /* enough codes to use up j bits */
 						}
-						f -= *xp;	/* else deduct codes from patterns */
+						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[h+1] = w + j;	/* set bits decoded in stack */
 
 				/* allocate and link in new table */
 				q = (huft_t *) xmalloc((z + 1) * sizeof(huft_t));
-
 				*t = q + 1;	/* link to list for huft_free() */
 				*(t = &(q->v.t)) = NULL;
 				u[h] = ++q;	/* table starts after link */
 
 				/* connect to last table, if there is one */
 				if (h) {
-					x[h] = i;	/* save pattern for backing up */
+					x[h] = i; /* save pattern for backing up */
-					r.b = (unsigned char) l;	/* bits to dump before this table */
+					r.b = (unsigned char) (w - ws[h - 1]); /* bits to dump before this table */
-					r.e = (unsigned char) (16 + j);	/* bits in this table */
+					r.e = (unsigned char) (16 + j); /* bits in this table */
-					r.v.t = q;	/* pointer to this table */
+					r.v.t = q; /* pointer to this table */
-					j = i >> (w - l);	/* (get around Turbo C bug) */
+					j = (i & ((1 << w) - 1)) >> ws[h - 1];
-					u[h - 1][j] = r;	/* connect to last table */
+					u[h - 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 */
+				r.e = 99; /* out of values--invalid code */
 			} else if (*p < s) {
-				r.e = (unsigned char) (*p < 256 ? 16 : 15);	/* 256 is end-of-block code */
+				r.e = (unsigned char) (*p < 256 ? 16 : 15);	/* 256 is EOB code */
-				r.v.n = (unsigned short) (*p);	/* simple code is just the value */
+				r.v.n = (unsigned short) (*p++); /* simple code is just the value */
-				p++;	/* one compiler does not like *p++ */
 			} else {
-				r.e = (unsigned char) e[*p - s];	/* non-simple--look up in lists */
+				r.e = (unsigned char) e[*p - s]; /* non-simple--look up in lists */
 				r.v.n = d[*p++ - s];
 			}
 
@@ -394,11 +388,14 @@ static int huft_build(unsigned int *b, const unsigned int n,
 
 			/* backup over finished tables */
 			while ((i & ((1 << w) - 1)) != x[h]) {
-				h--;	/* don't need to update q */
+				w = ws[--h];
-				w -= l;
 			}
 		}
 	}
+
+	/* return actual size of base table */
+	*m = ws[1];
+
 	/* Return true (1) if we were given an incomplete table */
 	return y != 0 && g != 1;
 }
@@ -904,6 +901,11 @@ extern void inflate_init(unsigned int bufsize)
 	bytebuffer_size = 0;
 }
 
+extern void inflate_cleanup(void)
+{
+	free(bytebuffer);
+}
+
 extern int inflate_unzip(int in, int out)
 {
 	ssize_t nwrote;

archival/unzip.c

@@ -2,7 +2,10 @@
 /*
  * Mini unzip implementation for busybox
  *
- * Copyright (C) 2001 by Laurence Anderson
+ * Copyright (C) 2004 by Ed Clark
+ *
+ * Loosely based on original busybox unzip applet by Laurence Anderson.
+ * All options and features should work in this version.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -21,227 +24,413 @@
  */
 
 /* For reference see
- * http://www.pkware.com/products/enterprise/white_papers/appnote.txt
+ * http://www.pkware.com/company/standards/appnote/
  * http://www.info-zip.org/pub/infozip/doc/appnote-iz-latest.zip
  */
 
-/* TODO Endian issues, exclude, should we accept input from stdin ? */
+/* TODO
+ * Endian issues
+ * Zip64 + other methods
+ * Improve handling of zip format, ie.
+ * - deferred CRC, comp. & uncomp. lengths (zip header flags bit 3)
+ * - unix file permissions, etc.
+ * - central directory
+ */
 
 #include <fcntl.h>
 #include <getopt.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <errno.h>
 #include "unarchive.h"
 #include "busybox.h"
 
-#define ZIP_FILEHEADER_MAGIC	0x04034b50
+#if (BYTE_ORDER == BIG_ENDIAN)
-#define ZIP_CDS_MAGIC			0x02014b50
+static inline unsigned short
-#define ZIP_CDS_END_MAGIC		0x06054b50
+__swap16(unsigned short x) {
-#define ZIP_DD_MAGIC			0x08074b50
+	return (((uint16_t)(x) & 0xFF) << 8) | (((uint16_t)(x) & 0xFF00) >> 8);
+}
+
+static inline uint32_t
+__swap32(uint32_t x) {
+	 return (((x & 0xFF) << 24) |
+		((x & 0xFF00) << 8) |
+		((x & 0xFF0000) >> 8) |
+		((x & 0xFF000000) >> 24));
+}
+#else
+#define __swap16(x) (x)
+#define __swap32(x) (x)
+#endif
+
+#define ZIP_FILEHEADER_MAGIC		__swap32(0x04034b50)
+#define ZIP_CDS_MAGIC			__swap32(0x02014b50)
+#define ZIP_CDS_END_MAGIC		__swap32(0x06054b50)
+#define ZIP_DD_MAGIC			__swap32(0x08074b50)
 
 extern unsigned int gunzip_crc;
 extern unsigned int gunzip_bytes_out;
 
-static void header_list_unzip(const file_header_t *file_header)
+typedef union {
+	unsigned char raw[26];
+	struct {
+		unsigned short version;	/* 0-1 */
+		unsigned short flags;	/* 2-3 */
+		unsigned short method;	/* 4-5 */
+		unsigned short modtime;	/* 6-7 */
+		unsigned short moddate;	/* 8-9 */
+		unsigned int crc32 __attribute__ ((packed));   	/* 10-13 */
+		unsigned int cmpsize __attribute__ ((packed)); 	/* 14-17 */
+		unsigned int ucmpsize __attribute__ ((packed));	/* 18-21 */
+		unsigned short filename_len;	/* 22-23 */
+		unsigned short extra_len;		/* 24-25 */
+	} formated __attribute__ ((packed));
+} zip_header_t;
+
+static void unzip_skip(int fd, off_t skip)
 {
-	printf("  inflating: %s\n", file_header->name);
+	if (lseek(fd, skip, SEEK_CUR) == (off_t)-1) {
+		if ((errno != ESPIPE) || (bb_copyfd_size(fd, -1, skip) != skip)) {
+			bb_error_msg_and_die("Seek failure");
+		}
+	}
 }
 
-static void header_verbose_list_unzip(const file_header_t *file_header)
+static void unzip_read(int fd, void *buf, size_t count)
 {
-	unsigned int dostime = (unsigned int) file_header->mtime;
+	if (bb_xread(fd, buf, count) != count) {
-
+		bb_error_msg_and_die("Read failure");
-	/* can printf arguments cut of the decade component ? */
-	unsigned short year = 1980 + ((dostime & 0xfe000000) >> 25);
-	while (year >= 100) {
-		year -= 100;
 	}
+}
 
-	printf("%9u  %02u-%02u-%02u %02u:%02u   %s\n",
+static void unzip_create_leading_dirs(char *fn)
-		(unsigned int) file_header->size,
+{
-		(dostime & 0x01e00000) >> 21,
+	/* Create all leading directories */
-		(dostime & 0x001f0000) >> 16,
+	char *name = bb_xstrdup(fn);
-		year,
+	if (bb_make_directory(dirname(name), 0777, FILEUTILS_RECUR)) {
-		(dostime & 0x0000f800) >> 11,
+		bb_error_msg_and_die("Failed to create directory");
-		(dostime & 0x000007e0) >> 5,
+	}
-		file_header->name);
+	free(name);
+}
+
+static void unzip_extract(zip_header_t *zip_header, int src_fd, int dst_fd)
+{
+	if (zip_header->formated.method == 0) {
+		/* Method 0 - stored (not compressed) */
+		int size = zip_header->formated.ucmpsize;
+		if (size && (bb_copyfd_size(src_fd, dst_fd, size) != size)) {
+			bb_error_msg_and_die("Cannot complete extraction");
+		}
+
+	} else {
+		/* Method 8 - inflate */
+		inflate_init(zip_header->formated.cmpsize);
+		inflate_unzip(src_fd, dst_fd);
+		inflate_cleanup();
+		/* Validate decompression - crc */
+		if (zip_header->formated.crc32 != (gunzip_crc ^ 0xffffffffL)) {
+			bb_error_msg("Invalid compressed data--crc error");
+		}
+		/* Validate decompression - size */
+		if (zip_header->formated.ucmpsize != gunzip_bytes_out) {
+			bb_error_msg("Invalid compressed data--length error");
+		}
+	}
 }
 
 extern int unzip_main(int argc, char **argv)
 {
-	union {
+	zip_header_t zip_header;
-		unsigned char raw[26];
+	enum {v_silent, v_normal, v_list} verbosity = v_normal;
-		struct {
+	enum {o_prompt, o_never, o_always} overwrite = o_prompt;
-			unsigned short version;	/* 0-1 */
-			unsigned short flags;	/* 2-3 */
-			unsigned short method;	/* 4-5 */
-			unsigned short modtime;	/* 6-7 */
-			unsigned short moddate;	/* 8-9 */
-			unsigned int crc32 __attribute__ ((packed));		/* 10-13 */
-			unsigned int cmpsize __attribute__ ((packed));;	/* 14-17 */
-			unsigned int ucmpsize __attribute__ ((packed));;	/* 18-21 */
-			unsigned short filename_len;		/* 22-23 */
-			unsigned short extra_len;		/* 24-25 */
-		} formated __attribute__ ((packed));
-	} zip_header;
-
-	archive_handle_t *archive_handle;
 	unsigned int total_size = 0;
 	unsigned int total_entries = 0;
+	int src_fd = -1, dst_fd = -1;
+	char *src_fn = NULL, *dst_fn = NULL;
+	llist_t *accept = NULL;
+	llist_t *reject = NULL;
 	char *base_dir = NULL;
-	int opt = 0;
+	int i, opt, opt_range = 0, list_header_done = 0;
+	char key_buf[512];
+	struct stat stat_buf;
 
-	/* Initialise */
+	while((opt = getopt(argc, argv, "-d:lnopqx")) != -1) {
-	archive_handle = init_handle();
+		switch(opt_range) {
-	archive_handle->action_data = NULL;
+		case 0: /* Options */
-	archive_handle->action_header = header_list_unzip;
+			switch(opt) {
+			case 'l': /* List */
+				verbosity = v_list;
+				break;
 
-	while ((opt = getopt(argc, argv, "lnopqd:")) != -1) {
+			case 'n': /* Never overwrite existing files */
-		switch (opt) {
+				overwrite = o_never;
-			case 'l':	/* list */
-				archive_handle->action_header = header_verbose_list_unzip;
-				archive_handle->action_data = data_skip;
 				break;
-			case 'n':	/* never overwright existing files */
+
+			case 'o': /* Always overwrite existing files */
+				overwrite = o_always;
 				break;
-			case 'o':
+
-				archive_handle->flags = ARCHIVE_EXTRACT_UNCONDITIONAL;
+			case 'p': /* Extract files to stdout and fall through to set verbosity */
+				dst_fd = STDOUT_FILENO;
+
+			case 'q': /* Be quiet */
+				verbosity = (verbosity == v_normal) ? v_silent : verbosity;
 				break;
-			case 'p':	/* extract files to stdout */
+
-				archive_handle->action_data = data_extract_to_stdout;
+			case 1 : /* The zip file */
+				src_fn = bb_xstrndup(optarg, strlen(optarg)+4);
+				opt_range++;
 				break;
-			case 'q':	/* Extract files quietly */
+
-				archive_handle->action_header = header_skip;
-				break;
-			case 'd':	/* Extract files to specified base directory*/
-				base_dir = optarg;
-				break;
-#if 0
-			case 'x':	/* Exclude the specified files */
-				archive_handle->filter = filter_accept_reject_list;
-				break;
-#endif
 			default:
 				bb_show_usage();
+
+			}
+			break;
+
+		case 1: /* Include files */
+			if (opt == 1) {
+				accept = llist_add_to(accept, optarg);
+
+			} else if (opt == 'd') {
+				base_dir = optarg;
+				opt_range += 2;
+
+			} else if (opt == 'x') {
+				opt_range++;
+
+			} else {
+				bb_show_usage();
+			}
+			break;
+
+		case 2 : /* Exclude files */
+			if (opt == 1) {
+				reject = llist_add_to(reject, optarg);
+
+			} else if (opt == 'd') { /* Extract to base directory */
+				base_dir = optarg;
+				opt_range++;
+
+			} else {
+				bb_show_usage();
+			}
+			break;
+
+		default:
+			bb_show_usage();
 		}
 	}
 
-	if (argc == optind) {
+	if (src_fn == NULL) {
 		bb_show_usage();
 	}
 
-	printf("Archive:  %s\n", argv[optind]);
+	/* Open input file */
-	if (archive_handle->action_header == header_verbose_list_unzip) {
+	if (strcmp("-", src_fn) == 0) {
-		printf("  Length     Date   Time    Name\n");
+		src_fd = STDIN_FILENO;
-		printf(" --------    ----   ----    ----\n");
+		/* Cannot use prompt mode since zip data is arriving on STDIN */
-	}
+		overwrite = (overwrite == o_prompt) ? o_never : overwrite;
 
-	if (*argv[optind] == '-') {
-		archive_handle->src_fd = STDIN_FILENO;
-		archive_handle->seek = seek_by_char;
 	} else {
-		archive_handle->src_fd = bb_xopen(argv[optind++], O_RDONLY);
+		char *extn[] = {"", ".zip", ".ZIP"};
+		int orig_src_fn_len = strlen(src_fn);
+		for(i = 0; (i < 3) && (src_fd == -1); i++) {
+			strcpy(src_fn + orig_src_fn_len, extn[i]);
+			src_fd = open(src_fn, O_RDONLY);
+		}
+		if (src_fd == -1) {
+			src_fn[orig_src_fn_len] = 0;
+			bb_error_msg_and_die("Cannot open %s, %s.zip, %s.ZIP", src_fn, src_fn, src_fn);
+		}
 	}
 
-	if ((base_dir) && (chdir(base_dir))) {
+	/* Change dir if necessary */
-		bb_perror_msg_and_die("Couldnt chdir");
+	if (base_dir && chdir(base_dir)) {
+		bb_perror_msg_and_die("Cannot chdir");
 	}
 
-	while (optind < argc) {
+	if (verbosity != v_silent)
-		archive_handle->filter = filter_accept_list;
+		printf("Archive:  %s\n", src_fn);
-		archive_handle->accept = llist_add_to(archive_handle->accept, argv[optind]);
-		optind++;
-	}
 
 	while (1) {
 		unsigned int magic;
-		int dst_fd;
-
-		/* TODO Endian issues */
-		archive_xread_all(archive_handle, &magic, 4);
-		archive_handle->offset += 4;
 
+		/* Check magic number */
+		unzip_read(src_fd, &magic, 4);
 		if (magic == ZIP_CDS_MAGIC) {
 			break;
-		}
+		} else if (magic != ZIP_FILEHEADER_MAGIC) {
-		else if (magic != ZIP_FILEHEADER_MAGIC) {
+			bb_error_msg_and_die("Invalid zip magic %08X", magic);
-			bb_error_msg_and_die("Invlaide zip magic");
 		}
 
 		/* Read the file header */
-		archive_xread_all(archive_handle, zip_header.raw, 26);
+		unzip_read(src_fd, zip_header.raw, 26);
-		archive_handle->offset += 26;
+#if (BYTE_ORDER == BIG_ENDIAN)
-		archive_handle->file_header->mode = S_IFREG | 0777;
+		zip_header.formated.version = __swap16(zip_header.formated.version);
-
+		zip_header.formated.flags = __swap16(zip_header.formated.flags);
-		if (zip_header.formated.method != 8) {
+		zip_header.formated.method = __swap16(zip_header.formated.method);
-			bb_error_msg_and_die("Unsupported compression method %d\n", zip_header.formated.method);
+		zip_header.formated.modtime = __swap16(zip_header.formated.modtime);
+		zip_header.formated.moddate = __swap16(zip_header.formated.moddate);
+		zip_header.formated.crc32 = __swap32(zip_header.formated.crc32);
+		zip_header.formated.cmpsize = __swap32(zip_header.formated.cmpsize);
+		zip_header.formated.ucmpsize = __swap32(zip_header.formated.ucmpsize);
+		zip_header.formated.filename_len = __swap16(zip_header.formated.filename_len);
+		zip_header.formated.extra_len = __swap16(zip_header.formated.extra_len);
+#endif
+		if ((zip_header.formated.method != 0) && (zip_header.formated.method != 8)) {
+			bb_error_msg_and_die("Unsupported compression method %d", zip_header.formated.method);
 		}
 
 		/* Read filename */
-		archive_handle->file_header->name = xmalloc(zip_header.formated.filename_len + 1);
+		free(dst_fn);
-		archive_xread_all(archive_handle, archive_handle->file_header->name, zip_header.formated.filename_len);
+		dst_fn = xmalloc(zip_header.formated.filename_len + 1);
-		archive_handle->offset += zip_header.formated.filename_len;
+		unzip_read(src_fd, dst_fn, zip_header.formated.filename_len);
-		archive_handle->file_header->name[zip_header.formated.filename_len] = '\0';
+		dst_fn[zip_header.formated.filename_len] = 0;
 
-		/* Skip extra header bits */
+		/* Skip extra header bytes */
-		archive_handle->file_header->size = zip_header.formated.extra_len;
+		unzip_skip(src_fd, zip_header.formated.extra_len);
-		data_skip(archive_handle);
-		archive_handle->offset += zip_header.formated.extra_len;
 
-		/* Handle directories */
+		if ((verbosity == v_list) && !list_header_done){
-		archive_handle->file_header->mode = S_IFREG | 0777;
+			printf("  Length     Date   Time    Name\n");
-		if (last_char_is(archive_handle->file_header->name, '/')) {
+			printf(" --------    ----   ----    ----\n");
-			archive_handle->file_header->mode ^= S_IFREG;
+			list_header_done = 1;
-			archive_handle->file_header->mode |= S_IFDIR;
 		}
 
-		/* Data section */
+		/* Filter zip entries */
-		archive_handle->file_header->size = zip_header.formated.cmpsize;
+		if (find_list_entry(reject, dst_fn) ||
-		if (archive_handle->action_data) {
+			(accept && !find_list_entry(accept, dst_fn))) { /* Skip entry */
-			archive_handle->action_data(archive_handle);
+			i = 'n';
-		} else {
-			dst_fd = bb_xopen(archive_handle->file_header->name, O_WRONLY | O_CREAT);
-			inflate_init(zip_header.formated.cmpsize);
-			inflate_unzip(archive_handle->src_fd, dst_fd);
-			close(dst_fd);
-			chmod(archive_handle->file_header->name, archive_handle->file_header->mode);
 
-			/* Validate decompression - crc */
+		} else { /* Extract entry */
-			if (zip_header.formated.crc32 != (gunzip_crc ^ 0xffffffffL)) {
+			total_size += zip_header.formated.ucmpsize;
-				bb_error_msg("Invalid compressed data--crc error");
-			}
 
-			/* Validate decompression - size */
+			if (verbosity == v_list) { /* List entry */
-			if (gunzip_bytes_out != zip_header.formated.ucmpsize) {
+				unsigned int dostime = zip_header.formated.modtime | (zip_header.formated.moddate << 16);
-				bb_error_msg("Invalid compressed data--length error");
+				printf("%9u  %02u-%02u-%02u %02u:%02u   %s\n",
+					   zip_header.formated.ucmpsize,
+					   (dostime & 0x01e00000) >> 21,
+					   (dostime & 0x001f0000) >> 16,
+					   (((dostime & 0xfe000000) >> 25) + 1980) % 100,
+					   (dostime & 0x0000f800) >> 11,
+					   (dostime & 0x000007e0) >> 5,
+					   dst_fn);
+				total_entries++;
+				i = 'n';
+
+			} else if (dst_fd == STDOUT_FILENO) { /* Extracting to STDOUT */
+				i = -1;
+
+			} else if (last_char_is(dst_fn, '/')) { /* Extract directory */
+				if (stat(dst_fn, &stat_buf) == -1) {
+					if (errno != ENOENT) {
+						bb_perror_msg_and_die("Cannot stat '%s'",dst_fn);
+					}
+					if (verbosity == v_normal) {
+						printf("   creating: %s\n", dst_fn);
+					}
+					unzip_create_leading_dirs(dst_fn);
+					if (bb_make_directory(dst_fn, 0777, 0)) {
+						bb_error_msg_and_die("Failed to create directory");
+					}
+				} else {
+					if (!S_ISDIR(stat_buf.st_mode)) {
+						bb_error_msg_and_die("'%s' exists but is not directory", dst_fn);
+					}
+				}
+				i = 'n';
+
+			} else {  /* Extract file */
+			_check_file:
+				if (stat(dst_fn, &stat_buf) == -1) { /* File does not exist */
+					if (errno != ENOENT) {
+						bb_perror_msg_and_die("Cannot stat '%s'",dst_fn);
+					}
+					i = 'y';
+
+				} else { /* File already exists */
+					if (overwrite == o_never) {
+						i = 'n';
+
+					} else if (S_ISREG(stat_buf.st_mode)) { /* File is regular file */
+						if (overwrite == o_always) {
+							i = 'y';
+						} else {
+							printf("replace %s? [y]es, [n]o, [A]ll, [N]one, [r]ename: ", dst_fn);
+							if (!fgets(key_buf, 512, stdin)) {
+								bb_perror_msg_and_die("Cannot read input");
+							}
+							i = key_buf[0];
+						}
+
+					} else { /* File is not regular file */
+						bb_error_msg_and_die("'%s' exists but is not regular file",dst_fn);
+					}
+				}
 			}
 		}
 
-		/* local file descriptor section */
+		switch (i) {
-		archive_handle->offset += zip_header.formated.cmpsize;
+		case 'A':
-		/* This ISNT unix time */
+			overwrite = o_always;
-		archive_handle->file_header->mtime = zip_header.formated.modtime | (zip_header.formated.moddate << 16);
+		case 'y': /* Open file and fall into unzip */
-		archive_handle->file_header->size = zip_header.formated.ucmpsize;
+			unzip_create_leading_dirs(dst_fn);
-		total_size += archive_handle->file_header->size;
+			dst_fd = bb_xopen(dst_fn, O_WRONLY | O_CREAT);
-		total_entries++;
+		case -1: /* Unzip */
+			if (verbosity == v_normal) {
+				printf("  inflating: %s\n", dst_fn);
+			}
+			unzip_extract(&zip_header, src_fd, dst_fd);
+			if (dst_fd != STDOUT_FILENO) {
+				/* closing STDOUT is potentially bad for future business */
+				close(dst_fd);
+			}
+			break;
 
-		archive_handle->action_header(archive_handle->file_header);
+		case 'N':
+			overwrite = o_never;
+		case 'n':
+			/* Skip entry data */
+			unzip_skip(src_fd, zip_header.formated.cmpsize);
+			break;
+
+		case 'r':
+			/* Prompt for new name */
+			printf("new name: ");
+			if (!fgets(key_buf, 512, stdin)) {
+				bb_perror_msg_and_die("Cannot read input");
+			}
+			free(dst_fn);
+			dst_fn = bb_xstrdup(key_buf);
+			chomp(dst_fn);
+			goto _check_file;
+
+		default:
+			printf("error:  invalid response [%c]\n",(char)i);
+			goto _check_file;
+		}
 
 		/* Data descriptor section */
 		if (zip_header.formated.flags & 4) {
 			/* skip over duplicate crc, compressed size and uncompressed size */
-			unsigned char data_description[12];
+			unzip_skip(src_fd, 12);
-			archive_xread_all(archive_handle, data_description, 12);
-			archive_handle->offset += 12;
 		}
 	}
-	/* Central directory section */
 
-	if (archive_handle->action_header == header_verbose_list_unzip) {
+	if (verbosity == v_list) {
 		printf(" --------                   -------\n");
 		printf("%9d                   %d files\n", total_size, total_entries);
 	}
 
 	return(EXIT_SUCCESS);
 }
+
+/* END CODE */
+/*
+Local Variables:
+c-file-style: "linux"
+c-basic-offset: 4
+tab-width: 4
+End:
+*/

include/unarchive.h

@@ -98,6 +98,7 @@ extern const llist_t *find_list_entry(const llist_t *list, const char *filename)
 
 extern int uncompressStream(int src_fd, int dst_fd);
 extern void inflate_init(unsigned int bufsize);
+extern void inflate_cleanup(void);
 extern int inflate_unzip(int in, int out);
 extern int inflate_gunzip(int in, int out);