unzip: do not use CDF.extra_len, read local file header. Closes 9536

While at it, shorten many field and variable names.

function                                             old     new   delta
unzip_main                                          2334    2376     +42

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 122 insertions, 114 deletions

diff --git a/archival/unzip.c b/archival/unzip.c
index 98a71c0..9214935 100644
--- a/archival/unzip.c
+++ b/archival/unzip.c
@@ -62,8 +62,8 @@
 enum {
 #if BB_BIG_ENDIAN
 	ZIP_FILEHEADER_MAGIC = 0x504b0304,
-	ZIP_CDF_MAGIC        = 0x504b0102, /* central directory's file header */
-	ZIP_CDE_MAGIC        = 0x504b0506, /* "end of central directory" record */
+	ZIP_CDF_MAGIC        = 0x504b0102, /* CDF item */
+	ZIP_CDE_MAGIC        = 0x504b0506, /* End of CDF */
 	ZIP_DD_MAGIC         = 0x504b0708,
 #else
 	ZIP_FILEHEADER_MAGIC = 0x04034b50,
@@ -91,16 +91,16 @@ typedef union {
 		/* filename follows (not NUL terminated) */
 		/* extra field follows */
 		/* data follows */
-	} formatted PACKED;
+	} fmt PACKED;
 } zip_header_t; /* PACKED - gcc 4.2.1 doesn't like it (spews warning) */
 
-#define FIX_ENDIANNESS_ZIP(zip_header) \
+#define FIX_ENDIANNESS_ZIP(zip) \
 do { if (BB_BIG_ENDIAN) { \
-	(zip_header).formatted.crc32        = SWAP_LE32((zip_header).formatted.crc32       ); \
-	(zip_header).formatted.cmpsize      = SWAP_LE32((zip_header).formatted.cmpsize     ); \
-	(zip_header).formatted.ucmpsize     = SWAP_LE32((zip_header).formatted.ucmpsize    ); \
-	(zip_header).formatted.filename_len = SWAP_LE16((zip_header).formatted.filename_len); \
-	(zip_header).formatted.extra_len    = SWAP_LE16((zip_header).formatted.extra_len   ); \
+	(zip).fmt.crc32         = SWAP_LE32((zip).fmt.crc32       ); \
+	(zip).fmt.cmpsize       = SWAP_LE32((zip).fmt.cmpsize     ); \
+	(zip).fmt.ucmpsize      = SWAP_LE32((zip).fmt.ucmpsize    ); \
+	(zip).fmt.filename_len  = SWAP_LE16((zip).fmt.filename_len); \
+	(zip).fmt.extra_len     = SWAP_LE16((zip).fmt.extra_len   ); \
 }} while (0)
 
 #define CDF_HEADER_LEN 42
@@ -118,39 +118,39 @@ typedef union {
 		uint32_t crc32;                 /* 12-15 */
 		uint32_t cmpsize;               /* 16-19 */
 		uint32_t ucmpsize;              /* 20-23 */
-		uint16_t file_name_length;      /* 24-25 */
-		uint16_t extra_field_length;    /* 26-27 */
+		uint16_t filename_len;          /* 24-25 */
+		uint16_t extra_len;             /* 26-27 */
 		uint16_t file_comment_length;   /* 28-29 */
 		uint16_t disk_number_start;     /* 30-31 */
-		uint16_t internal_file_attributes; /* 32-33 */
-		uint32_t external_file_attributes PACKED; /* 34-37 */
+		uint16_t internal_attributes;   /* 32-33 */
+		uint32_t external_attributes PACKED; /* 34-37 */
 		uint32_t relative_offset_of_local_header PACKED; /* 38-41 */
 		/* filename follows (not NUL terminated) */
 		/* extra field follows */
-		/* comment follows */
-	} formatted PACKED;
+		/* file comment follows */
+	} fmt PACKED;
 } cdf_header_t;
 
-#define FIX_ENDIANNESS_CDF(cdf_header) \
+#define FIX_ENDIANNESS_CDF(cdf) \
 do { if (BB_BIG_ENDIAN) { \
-	(cdf_header).formatted.version_made_by = SWAP_LE16((cdf_header).formatted.version_made_by); \
-	(cdf_header).formatted.version_needed = SWAP_LE16((cdf_header).formatted.version_needed); \
-	(cdf_header).formatted.method       = SWAP_LE16((cdf_header).formatted.method      ); \
-	(cdf_header).formatted.modtime      = SWAP_LE16((cdf_header).formatted.modtime     ); \
-	(cdf_header).formatted.moddate      = SWAP_LE16((cdf_header).formatted.moddate     ); \
-	(cdf_header).formatted.crc32        = SWAP_LE32((cdf_header).formatted.crc32       ); \
-	(cdf_header).formatted.cmpsize      = SWAP_LE32((cdf_header).formatted.cmpsize     ); \
-	(cdf_header).formatted.ucmpsize     = SWAP_LE32((cdf_header).formatted.ucmpsize    ); \
-	(cdf_header).formatted.file_name_length = SWAP_LE16((cdf_header).formatted.file_name_length); \
-	(cdf_header).formatted.extra_field_length = SWAP_LE16((cdf_header).formatted.extra_field_length); \
-	(cdf_header).formatted.file_comment_length = SWAP_LE16((cdf_header).formatted.file_comment_length); \
-	(cdf_header).formatted.external_file_attributes = SWAP_LE32((cdf_header).formatted.external_file_attributes); \
+	(cdf).fmt.version_made_by = SWAP_LE16((cdf).fmt.version_made_by); \
+	(cdf).fmt.version_needed = SWAP_LE16((cdf).fmt.version_needed); \
+	(cdf).fmt.method        = SWAP_LE16((cdf).fmt.method      ); \
+	(cdf).fmt.modtime       = SWAP_LE16((cdf).fmt.modtime     ); \
+	(cdf).fmt.moddate       = SWAP_LE16((cdf).fmt.moddate     ); \
+	(cdf).fmt.crc32         = SWAP_LE32((cdf).fmt.crc32       ); \
+	(cdf).fmt.cmpsize       = SWAP_LE32((cdf).fmt.cmpsize     ); \
+	(cdf).fmt.ucmpsize      = SWAP_LE32((cdf).fmt.ucmpsize    ); \
+	(cdf).fmt.filename_len  = SWAP_LE16((cdf).fmt.filename_len); \
+	(cdf).fmt.extra_len     = SWAP_LE16((cdf).fmt.extra_len   ); \
+	(cdf).fmt.file_comment_length = SWAP_LE16((cdf).fmt.file_comment_length); \
+	(cdf).fmt.external_attributes = SWAP_LE32((cdf).fmt.external_attributes); \
 }} while (0)
 
-#define CDE_HEADER_LEN 16
+#define CDE_LEN 16
 
 typedef union {
-	uint8_t raw[CDE_HEADER_LEN];
+	uint8_t raw[CDE_LEN];
 	struct {
 		/* uint32_t signature; 50 4b 05 06 */
 		uint16_t this_disk_no;
@@ -159,14 +159,14 @@ typedef union {
 		uint16_t cdf_entries_total;
 		uint32_t cdf_size;
 		uint32_t cdf_offset;
-		/* uint16_t file_comment_length; */
-		/* .ZIP file comment (variable size) */
-	} formatted PACKED;
-} cde_header_t;
+		/* uint16_t archive_comment_length; */
+		/* archive comment follows */
+	} fmt PACKED;
+} cde_t;
 
-#define FIX_ENDIANNESS_CDE(cde_header) \
+#define FIX_ENDIANNESS_CDE(cde) \
 do { if (BB_BIG_ENDIAN) { \
-	(cde_header).formatted.cdf_offset = SWAP_LE32((cde_header).formatted.cdf_offset); \
+	(cde).fmt.cdf_offset = SWAP_LE32((cde).fmt.cdf_offset); \
 }} while (0)
 
 struct BUG {
@@ -175,13 +175,13 @@ struct BUG {
 	 * even though the elements are all in the right place.
 	 */
 	char BUG_zip_header_must_be_26_bytes[
-		offsetof(zip_header_t, formatted.extra_len) + 2
+		offsetof(zip_header_t, fmt.extra_len) + 2
 			== ZIP_HEADER_LEN ? 1 : -1];
 	char BUG_cdf_header_must_be_42_bytes[
-		offsetof(cdf_header_t, formatted.relative_offset_of_local_header) + 4
+		offsetof(cdf_header_t, fmt.relative_offset_of_local_header) + 4
 			== CDF_HEADER_LEN ? 1 : -1];
-	char BUG_cde_header_must_be_16_bytes[
-		sizeof(cde_header_t) == CDE_HEADER_LEN ? 1 : -1];
+	char BUG_cde_must_be_16_bytes[
+		sizeof(cde_t) == CDE_LEN ? 1 : -1];
 };
 
 
@@ -207,7 +207,7 @@ enum { zip_fd = 3 };
 /* NB: does not preserve file position! */
 static uint32_t find_cdf_offset(void)
 {
-	cde_header_t cde_header;
+	cde_t cde;
 	unsigned char *buf;
 	unsigned char *p;
 	off_t end;
@@ -228,7 +228,7 @@ static uint32_t find_cdf_offset(void)
 
 	found = BAD_CDF_OFFSET;
 	p = buf;
-	while (p <= buf + PEEK_FROM_END - CDE_HEADER_LEN - 4) {
+	while (p <= buf + PEEK_FROM_END - CDE_LEN - 4) {
 		if (*p != 'P') {
 			p++;
 			continue;
@@ -240,19 +240,19 @@ static uint32_t find_cdf_offset(void)
 		if (*++p != 6)
 			continue;
 		/* we found CDE! */
-		memcpy(cde_header.raw, p + 1, CDE_HEADER_LEN);
-		FIX_ENDIANNESS_CDE(cde_header);
+		memcpy(cde.raw, p + 1, CDE_LEN);
+		FIX_ENDIANNESS_CDE(cde);
 		/*
 		 * I've seen .ZIP files with seemingly valid CDEs
 		 * where cdf_offset points past EOF - ??
 		 * This check ignores such CDEs:
 		 */
-		if (cde_header.formatted.cdf_offset < end + (p - buf)) {
-			found = cde_header.formatted.cdf_offset;
+		if (cde.fmt.cdf_offset < end + (p - buf)) {
+			found = cde.fmt.cdf_offset;
 			dbg("Possible cdf_offset:0x%x at 0x%"OFF_FMT"x",
 				(unsigned)found, end + (p-3 - buf));
 			dbg("  cdf_offset+cdf_size:0x%x",
-				(unsigned)(found + SWAP_LE32(cde_header.formatted.cdf_size)));
+				(unsigned)(found + SWAP_LE32(cde.fmt.cdf_size)));
 			/*
 			 * We do not "break" here because only the last CDE is valid.
 			 * I've seen a .zip archive which contained a .zip file,
@@ -266,7 +266,7 @@ static uint32_t find_cdf_offset(void)
 	return found;
 };
 
-static uint32_t read_next_cdf(uint32_t cdf_offset, cdf_header_t *cdf_ptr)
+static uint32_t read_next_cdf(uint32_t cdf_offset, cdf_header_t *cdf)
 {
 	uint32_t magic;
 
@@ -276,23 +276,25 @@ static uint32_t read_next_cdf(uint32_t cdf_offset, cdf_header_t *cdf_ptr)
 	dbg("Reading CDF at 0x%x", (unsigned)cdf_offset);
 	xlseek(zip_fd, cdf_offset, SEEK_SET);
 	xread(zip_fd, &magic, 4);
-	/* Central Directory End? */
+	/* Central Directory End? Assume CDF has ended.
+	 * (more correct method is to use cde.cdf_entries_total counter)
+	 */
 	if (magic == ZIP_CDE_MAGIC) {
 		dbg("got ZIP_CDE_MAGIC");
 		return 0; /* EOF */
 	}
-	xread(zip_fd, cdf_ptr->raw, CDF_HEADER_LEN);
+	xread(zip_fd, cdf->raw, CDF_HEADER_LEN);
 
-	FIX_ENDIANNESS_CDF(*cdf_ptr);
-	dbg("  file_name_length:%u extra_field_length:%u file_comment_length:%u",
-		(unsigned)cdf_ptr->formatted.file_name_length,
-		(unsigned)cdf_ptr->formatted.extra_field_length,
-		(unsigned)cdf_ptr->formatted.file_comment_length
+	FIX_ENDIANNESS_CDF(*cdf);
+	dbg("  filename_len:%u extra_len:%u file_comment_length:%u",
+		(unsigned)cdf->fmt.filename_len,
+		(unsigned)cdf->fmt.extra_len,
+		(unsigned)cdf->fmt.file_comment_length
 	);
 	cdf_offset += 4 + CDF_HEADER_LEN
-		+ cdf_ptr->formatted.file_name_length
-		+ cdf_ptr->formatted.extra_field_length
-		+ cdf_ptr->formatted.file_comment_length;
+		+ cdf->fmt.filename_len
+		+ cdf->fmt.extra_len
+		+ cdf->fmt.file_comment_length;
 
 	return cdf_offset;
 };
@@ -315,28 +317,28 @@ static void unzip_create_leading_dirs(const char *fn)
 	free(name);
 }
 
-static void unzip_extract(zip_header_t *zip_header, int dst_fd)
+static void unzip_extract(zip_header_t *zip, int dst_fd)
 {
-	if (zip_header->formatted.method == 0) {
+	if (zip->fmt.method == 0) {
 		/* Method 0 - stored (not compressed) */
-		off_t size = zip_header->formatted.ucmpsize;
+		off_t size = zip->fmt.ucmpsize;
 		if (size)
 			bb_copyfd_exact_size(zip_fd, dst_fd, size);
 	} else {
 		/* Method 8 - inflate */
 		transformer_state_t xstate;
 		init_transformer_state(&xstate);
-		xstate.bytes_in = zip_header->formatted.cmpsize;
+		xstate.bytes_in = zip->fmt.cmpsize;
 		xstate.src_fd = zip_fd;
 		xstate.dst_fd = dst_fd;
 		if (inflate_unzip(&xstate) < 0)
 			bb_error_msg_and_die("inflate error");
 		/* Validate decompression - crc */
-		if (zip_header->formatted.crc32 != (xstate.crc32 ^ 0xffffffffL)) {
+		if (zip->fmt.crc32 != (xstate.crc32 ^ 0xffffffffL)) {
 			bb_error_msg_and_die("crc error");
 		}
 		/* Validate decompression - size */
-		if (zip_header->formatted.ucmpsize != xstate.bytes_out) {
+		if (zip->fmt.ucmpsize != xstate.bytes_out) {
 			/* Don't die. Who knows, maybe len calculation
 			 * was botched somewhere. After all, crc matched! */
 			bb_error_msg("bad length");
@@ -563,7 +565,7 @@ int unzip_main(int argc, char **argv)
 	total_entries = 0;
 	cdf_offset = find_cdf_offset();	/* try to seek to the end, find CDE and CDF start */
 	while (1) {
-		zip_header_t zip_header;
+		zip_header_t zip;
 		mode_t dir_mode = 0777;
 #if ENABLE_FEATURE_UNZIP_CDF
 		mode_t file_mode = 0666;
@@ -589,7 +591,7 @@ int unzip_main(int argc, char **argv)
 
 			/* Check magic number */
 			xread(zip_fd, &magic, 4);
-			/* Central directory? It's at the end, so exit */
+			/* CDF item? Assume there are no more files, exit */
 			if (magic == ZIP_CDF_MAGIC) {
 				dbg("got ZIP_CDF_MAGIC");
 				break;
@@ -605,71 +607,74 @@ int unzip_main(int argc, char **argv)
 				bb_error_msg_and_die("invalid zip magic %08X", (int)magic);
 			dbg("got ZIP_FILEHEADER_MAGIC");
 
-			xread(zip_fd, zip_header.raw, ZIP_HEADER_LEN);
-			FIX_ENDIANNESS_ZIP(zip_header);
-			if ((zip_header.formatted.method != 0)
-			 && (zip_header.formatted.method != 8)
+			xread(zip_fd, zip.raw, ZIP_HEADER_LEN);
+			FIX_ENDIANNESS_ZIP(zip);
+			if ((zip.fmt.method != 0)
+			 && (zip.fmt.method != 8)
 			) {
 				/* TODO? method 12: bzip2, method 14: LZMA */
-				bb_error_msg_and_die("unsupported method %d", zip_header.formatted.method);
+				bb_error_msg_and_die("unsupported method %d", zip.fmt.method);
 			}
-			if (zip_header.formatted.zip_flags & SWAP_LE16(0x0009)) {
+			if (zip.fmt.zip_flags & SWAP_LE16(0x0009)) {
 				bb_error_msg_and_die("zip flags 1 and 8 are not supported");
 			}
 		}
 #if ENABLE_FEATURE_UNZIP_CDF
 		else {
 			/* cdf_offset is valid (and we know the file is seekable) */
-			cdf_header_t cdf_header;
-			cdf_offset = read_next_cdf(cdf_offset, &cdf_header);
+			cdf_header_t cdf;
+			cdf_offset = read_next_cdf(cdf_offset, &cdf);
 			if (cdf_offset == 0) /* EOF? */
 				break;
-# if 0
+# if 1
 			xlseek(zip_fd,
-				SWAP_LE32(cdf_header.formatted.relative_offset_of_local_header) + 4,
+				SWAP_LE32(cdf.fmt.relative_offset_of_local_header) + 4,
 				SEEK_SET);
-			xread(zip_fd, zip_header.raw, ZIP_HEADER_LEN);
-			FIX_ENDIANNESS_ZIP(zip_header);
-			if (zip_header.formatted.zip_flags & SWAP_LE16(0x0008)) {
+			xread(zip_fd, zip.raw, ZIP_HEADER_LEN);
+			FIX_ENDIANNESS_ZIP(zip);
+			if (zip.fmt.zip_flags & SWAP_LE16(0x0008)) {
 				/* 0x0008 - streaming. [u]cmpsize can be reliably gotten
 				 * only from Central Directory.
 				 */
-				zip_header.formatted.crc32    = cdf_header.formatted.crc32;
-				zip_header.formatted.cmpsize  = cdf_header.formatted.cmpsize;
-				zip_header.formatted.ucmpsize = cdf_header.formatted.ucmpsize;
+				zip.fmt.crc32    = cdf.fmt.crc32;
+				zip.fmt.cmpsize  = cdf.fmt.cmpsize;
+				zip.fmt.ucmpsize = cdf.fmt.ucmpsize;
 			}
 # else
-			/* CDF has the same data as local header, no need to read the latter */
-			memcpy(&zip_header.formatted.version,
-				&cdf_header.formatted.version_needed, ZIP_HEADER_LEN);
+			/* CDF has the same data as local header, no need to read the latter...
+			 * ...not really. An archive was seen with cdf.extra_len == 6 but
+			 * zip.extra_len == 0.
+			 */
+			memcpy(&zip.fmt.version,
+				&cdf.fmt.version_needed, ZIP_HEADER_LEN);
 			xlseek(zip_fd,
-				SWAP_LE32(cdf_header.formatted.relative_offset_of_local_header) + 4 + ZIP_HEADER_LEN,
+				SWAP_LE32(cdf.fmt.relative_offset_of_local_header) + 4 + ZIP_HEADER_LEN,
 				SEEK_SET);
 # endif
-			if ((cdf_header.formatted.version_made_by >> 8) == 3) {
+			if ((cdf.fmt.version_made_by >> 8) == 3) {
 				/* This archive is created on Unix */
-				dir_mode = file_mode = (cdf_header.formatted.external_file_attributes >> 16);
+				dir_mode = file_mode = (cdf.fmt.external_attributes >> 16);
 			}
 		}
 #endif
 
-		if (zip_header.formatted.zip_flags & SWAP_LE16(0x0001)) {
+		if (zip.fmt.zip_flags & SWAP_LE16(0x0001)) {
 			/* 0x0001 - encrypted */
 			bb_error_msg_and_die("zip flag 1 (encryption) is not supported");
 		}
 		dbg("File cmpsize:0x%x extra_len:0x%x ucmpsize:0x%x",
-			(unsigned)zip_header.formatted.cmpsize,
-			(unsigned)zip_header.formatted.extra_len,
-			(unsigned)zip_header.formatted.ucmpsize
+			(unsigned)zip.fmt.cmpsize,
+			(unsigned)zip.fmt.extra_len,
+			(unsigned)zip.fmt.ucmpsize
 		);
 
 		/* Read filename */
 		free(dst_fn);
-		dst_fn = xzalloc(zip_header.formatted.filename_len + 1);
-		xread(zip_fd, dst_fn, zip_header.formatted.filename_len);
+		dst_fn = xzalloc(zip.fmt.filename_len + 1);
+		xread(zip_fd, dst_fn, zip.fmt.filename_len);
 
 		/* Skip extra header bytes */
-		unzip_skip(zip_header.formatted.extra_len);
+		unzip_skip(zip.fmt.extra_len);
 
 		/* Guard against "/abspath", "/../" and similar attacks */
 		overlapping_strcpy(dst_fn, strip_unsafe_prefix(dst_fn));
@@ -684,32 +689,32 @@ int unzip_main(int argc, char **argv)
 				/* List entry */
 				char dtbuf[sizeof("mm-dd-yyyy hh:mm")];
 				sprintf(dtbuf, "%02u-%02u-%04u %02u:%02u",
-					(zip_header.formatted.moddate >> 5) & 0xf,  // mm: 0x01e0
-					(zip_header.formatted.moddate)      & 0x1f, // dd: 0x001f
-					(zip_header.formatted.moddate >> 9) + 1980, // yy: 0xfe00
-					(zip_header.formatted.modtime >> 11),       // hh: 0xf800
-					(zip_header.formatted.modtime >> 5) & 0x3f  // mm: 0x07e0
-					// seconds/2 are not shown, encoded in ----------- 0x001f
+					(zip.fmt.moddate >> 5) & 0xf,  // mm: 0x01e0
+					(zip.fmt.moddate)      & 0x1f, // dd: 0x001f
+					(zip.fmt.moddate >> 9) + 1980, // yy: 0xfe00
+					(zip.fmt.modtime >> 11),       // hh: 0xf800
+					(zip.fmt.modtime >> 5) & 0x3f  // mm: 0x07e0
+					// seconds/2 not shown, encoded in -- 0x001f
 				);
 				if (!verbose) {
 					//      "  Length      Date    Time    Name\n"
 					//      "---------  ---------- -----   ----"
 					printf(       "%9u  " "%s   "         "%s\n",
-						(unsigned)zip_header.formatted.ucmpsize,
+						(unsigned)zip.fmt.ucmpsize,
 						dtbuf,
 						dst_fn);
 				} else {
-					unsigned long percents = zip_header.formatted.ucmpsize - zip_header.formatted.cmpsize;
+					unsigned long percents = zip.fmt.ucmpsize - zip.fmt.cmpsize;
 					if ((int32_t)percents < 0)
 						percents = 0; /* happens if ucmpsize < cmpsize */
 					percents = percents * 100;
-					if (zip_header.formatted.ucmpsize)
-						percents /= zip_header.formatted.ucmpsize;
+					if (zip.fmt.ucmpsize)
+						percents /= zip.fmt.ucmpsize;
 					//      " Length   Method    Size  Cmpr    Date    Time   CRC-32   Name\n"
 					//      "--------  ------  ------- ---- ---------- ----- --------  ----"
 					printf(      "%8u  %s"        "%9u%4u%% " "%s "         "%08x  "  "%s\n",
-						(unsigned)zip_header.formatted.ucmpsize,
-						zip_header.formatted.method == 0 ? "Stored" : "Defl:N", /* Defl is method 8 */
+						(unsigned)zip.fmt.ucmpsize,
+						zip.fmt.method == 0 ? "Stored" : "Defl:N", /* Defl is method 8 */
 /* TODO: show other methods?
  *  1 - Shrunk
  *  2 - Reduced with compression factor 1
@@ -722,15 +727,16 @@ int unzip_main(int argc, char **argv)
  * 10 - PKWARE Data Compression Library Imploding
  * 11 - Reserved by PKWARE
  * 12 - BZIP2
+ * 14 - LZMA
  */
-						(unsigned)zip_header.formatted.cmpsize,
+						(unsigned)zip.fmt.cmpsize,
 						(unsigned)percents,
 						dtbuf,
-						zip_header.formatted.crc32,
+						zip.fmt.crc32,
 						dst_fn);
-					total_size += zip_header.formatted.cmpsize;
+					total_size += zip.fmt.cmpsize;
 				}
-				total_usize += zip_header.formatted.ucmpsize;
+				total_usize += zip.fmt.ucmpsize;
 				i = 'n';
 			} else if (dst_fd == STDOUT_FILENO) {
 				/* Extracting to STDOUT */
@@ -798,9 +804,11 @@ int unzip_main(int argc, char **argv)
 #endif
 		case -1: /* Unzip */
 			if (!quiet) {
-				printf("  inflating: %s\n", dst_fn);
+				printf(/* zip.fmt.method == 0
+					? " extracting: %s\n"
+					: */ "  inflating: %s\n", dst_fn);
 			}
-			unzip_extract(&zip_header, dst_fd);
+			unzip_extract(&zip, dst_fd);
 			if (dst_fd != STDOUT_FILENO) {
 				/* closing STDOUT is potentially bad for future business */
 				close(dst_fd);
@@ -811,7 +819,7 @@ int unzip_main(int argc, char **argv)
 			overwrite = O_NEVER;
 		case 'n':
 			/* Skip entry data */
-			unzip_skip(zip_header.formatted.cmpsize);
+			unzip_skip(zip.fmt.cmpsize);
 			break;
 
 		case 'r':