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-rw-r--r--archival/unzip.c143
1 files changed, 88 insertions, 55 deletions
diff --git a/archival/unzip.c b/archival/unzip.c
index afab3280d..868166bb1 100644
--- a/archival/unzip.c
+++ b/archival/unzip.c
@@ -25,12 +25,12 @@
enum {
#if BB_BIG_ENDIAN
ZIP_FILEHEADER_MAGIC = 0x504b0304,
- ZIP_CDS_MAGIC = 0x504b0102,
- ZIP_CDE_MAGIC = 0x504b0506,
+ ZIP_CDF_MAGIC = 0x504b0102, /* central directory's file header */
+ ZIP_CDE_MAGIC = 0x504b0506, /* "end of central directory" record */
ZIP_DD_MAGIC = 0x504b0708,
#else
ZIP_FILEHEADER_MAGIC = 0x04034b50,
- ZIP_CDS_MAGIC = 0x02014b50,
+ ZIP_CDF_MAGIC = 0x02014b50,
ZIP_CDE_MAGIC = 0x06054b50,
ZIP_DD_MAGIC = 0x08074b50,
#endif
@@ -77,15 +77,15 @@ struct BUG_zip_header_must_be_26_bytes {
(zip_header).formatted.extra_len = SWAP_LE16((zip_header).formatted.extra_len ); \
} while (0)
-#define CDS_HEADER_LEN 42
+#define CDF_HEADER_LEN 42
typedef union {
- uint8_t raw[CDS_HEADER_LEN];
+ uint8_t raw[CDF_HEADER_LEN];
struct {
/* uint32_t signature; 50 4b 01 02 */
uint16_t version_made_by; /* 0-1 */
uint16_t version_needed; /* 2-3 */
- uint16_t cds_flags; /* 4-5 */
+ uint16_t cdf_flags; /* 4-5 */
uint16_t method; /* 6-7 */
uint16_t mtime; /* 8-9 */
uint16_t mdate; /* 10-11 */
@@ -100,21 +100,25 @@ typedef union {
uint32_t external_file_attributes PACKED; /* 34-37 */
uint32_t relative_offset_of_local_header PACKED; /* 38-41 */
} formatted PACKED;
-} cds_header_t;
+} cdf_header_t;
-struct BUG_cds_header_must_be_42_bytes {
- char BUG_cds_header_must_be_42_bytes[
- offsetof(cds_header_t, formatted.relative_offset_of_local_header) + 4
- == CDS_HEADER_LEN ? 1 : -1];
+struct BUG_cdf_header_must_be_42_bytes {
+ char BUG_cdf_header_must_be_42_bytes[
+ offsetof(cdf_header_t, formatted.relative_offset_of_local_header) + 4
+ == CDF_HEADER_LEN ? 1 : -1];
};
-#define FIX_ENDIANNESS_CDS(cds_header) do { \
- (cds_header).formatted.crc32 = SWAP_LE32((cds_header).formatted.crc32 ); \
- (cds_header).formatted.cmpsize = SWAP_LE32((cds_header).formatted.cmpsize ); \
- (cds_header).formatted.ucmpsize = SWAP_LE32((cds_header).formatted.ucmpsize ); \
- (cds_header).formatted.file_name_length = SWAP_LE16((cds_header).formatted.file_name_length); \
- (cds_header).formatted.extra_field_length = SWAP_LE16((cds_header).formatted.extra_field_length); \
- (cds_header).formatted.file_comment_length = SWAP_LE16((cds_header).formatted.file_comment_length); \
+#define FIX_ENDIANNESS_CDF(cdf_header) do { \
+ (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); \
+ IF_DESKTOP( \
+ (cdf_header).formatted.version_made_by = SWAP_LE16((cdf_header).formatted.version_made_by); \
+ (cdf_header).formatted.external_file_attributes = SWAP_LE32((cdf_header).formatted.external_file_attributes); \
+ ) \
} while (0)
#define CDE_HEADER_LEN 16
@@ -124,11 +128,11 @@ typedef union {
struct {
/* uint32_t signature; 50 4b 05 06 */
uint16_t this_disk_no;
- uint16_t disk_with_cds_no;
- uint16_t cds_entries_on_this_disk;
- uint16_t cds_entries_total;
- uint32_t cds_size;
- uint32_t cds_offset;
+ uint16_t disk_with_cdf_no;
+ uint16_t cdf_entries_on_this_disk;
+ 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;
@@ -140,7 +144,7 @@ struct BUG_cde_header_must_be_16_bytes {
};
#define FIX_ENDIANNESS_CDE(cde_header) do { \
- (cde_header).formatted.cds_offset = SWAP_LE32((cde_header).formatted.cds_offset); \
+ (cde_header).formatted.cdf_offset = SWAP_LE32((cde_header).formatted.cdf_offset); \
} while (0)
enum { zip_fd = 3 };
@@ -148,7 +152,7 @@ enum { zip_fd = 3 };
#if ENABLE_DESKTOP
/* NB: does not preserve file position! */
-static uint32_t find_cds_offset(void)
+static uint32_t find_cdf_offset(void)
{
unsigned char buf[1024];
cde_header_t cde_header;
@@ -177,32 +181,30 @@ static uint32_t find_cds_offset(void)
/* we found CDE! */
memcpy(cde_header.raw, p + 1, CDE_HEADER_LEN);
FIX_ENDIANNESS_CDE(cde_header);
- return cde_header.formatted.cds_offset;
+ return cde_header.formatted.cdf_offset;
}
bb_error_msg_and_die("can't find file table");
};
-static uint32_t read_next_cds(int count_m1, uint32_t cds_offset, cds_header_t *cds_ptr)
+static uint32_t read_next_cdf(uint32_t cdf_offset, cdf_header_t *cdf_ptr)
{
off_t org;
org = xlseek(zip_fd, 0, SEEK_CUR);
- if (!cds_offset)
- cds_offset = find_cds_offset();
-
- while (count_m1-- >= 0) {
- xlseek(zip_fd, cds_offset + 4, SEEK_SET);
- xread(zip_fd, cds_ptr->raw, CDS_HEADER_LEN);
- FIX_ENDIANNESS_CDS(*cds_ptr);
- cds_offset += 4 + CDS_HEADER_LEN
- + cds_ptr->formatted.file_name_length
- + cds_ptr->formatted.extra_field_length
- + cds_ptr->formatted.file_comment_length;
- }
+ if (!cdf_offset)
+ cdf_offset = find_cdf_offset();
+
+ xlseek(zip_fd, cdf_offset + 4, SEEK_SET);
+ xread(zip_fd, cdf_ptr->raw, CDF_HEADER_LEN);
+ FIX_ENDIANNESS_CDF(*cdf_ptr);
+ cdf_offset += 4 + CDF_HEADER_LEN
+ + cdf_ptr->formatted.file_name_length
+ + cdf_ptr->formatted.extra_field_length
+ + cdf_ptr->formatted.file_comment_length;
xlseek(zip_fd, org, SEEK_SET);
- return cds_offset;
+ return cdf_offset;
};
#endif
@@ -258,8 +260,7 @@ int unzip_main(int argc, char **argv)
smallint listing = 0;
smallint overwrite = O_PROMPT;
#if ENABLE_DESKTOP
- uint32_t cds_offset;
- unsigned cds_entries;
+ uint32_t cdf_offset;
#endif
unsigned long total_usize;
unsigned long total_size;
@@ -435,20 +436,42 @@ int unzip_main(int argc, char **argv)
}
}
+/* Example of an archive with one 0-byte long file named 'z'
+ * created by Zip 2.31 on Unix:
+ * 0000 [50 4b]03 04 0a 00 00 00 00 00 42 1a b8 3c 00 00 |PK........B..<..|
+ * sig........ vneed flags compr mtime mdate crc32>
+ * 0010 00 00 00 00 00 00 00 00 00 00 01 00 15 00 7a 55 |..............zU|
+ * >..... csize...... usize...... fnlen exlen fn ex>
+ * 0020 54 09 00 03 cc d3 f9 4b cc d3 f9 4b 55 78 04 00 |T......K...KUx..|
+ * >tra_field......................................
+ * 0030 00 00 00 00[50 4b]01 02 17 03 0a 00 00 00 00 00 |....PK..........|
+ * ........... sig........ vmade vneed flags compr
+ * 0040 42 1a b8 3c 00 00 00 00 00 00 00 00 00 00 00 00 |B..<............|
+ * mtime mdate crc32...... csize...... usize......
+ * 0050 01 00 0d 00 00 00 00 00 00 00 00 00 a4 81 00 00 |................|
+ * fnlen exlen clen. dnum. iattr eattr...... relofs> (eattr = rw-r--r--)
+ * 0060 00 00 7a 55 54 05 00 03 cc d3 f9 4b 55 78 00 00 |..zUT......KUx..|
+ * >..... fn extra_field...........................
+ * 0070 [50 4b]05 06 00 00 00 00 01 00 01 00 3c 00 00 00 |PK..........<...|
+ * 0080 34 00 00 00 00 00 |4.....|
+ */
total_usize = 0;
total_size = 0;
total_entries = 0;
#if ENABLE_DESKTOP
- cds_entries = 0;
- cds_offset = 0;
+ cdf_offset = 0;
#endif
while (1) {
uint32_t magic;
+ mode_t dir_mode = 0777;
+#if ENABLE_DESKTOP
+ mode_t file_mode = 0666;
+#endif
/* Check magic number */
xread(zip_fd, &magic, 4);
/* Central directory? It's at the end, so exit */
- if (magic == ZIP_CDS_MAGIC)
+ if (magic == ZIP_CDF_MAGIC)
break;
#if ENABLE_DESKTOP
/* Data descriptor? It was a streaming file, go on */
@@ -476,15 +499,21 @@ int unzip_main(int argc, char **argv)
/* 0x0001 - encrypted */
bb_error_msg_and_die("zip flag 1 (encryption) is not supported");
}
- if (zip_header.formatted.flags & 0x0008) {
- cds_header_t cds_header;
- /* 0x0008 - streaming. [u]cmpsize can be reliably gotten
- * only from Central Directory. See unzip_doc.txt */
- cds_offset = read_next_cds(total_entries - cds_entries, cds_offset, &cds_header);
- cds_entries = total_entries + 1;
- zip_header.formatted.crc32 = cds_header.formatted.crc32;
- zip_header.formatted.cmpsize = cds_header.formatted.cmpsize;
- zip_header.formatted.ucmpsize = cds_header.formatted.ucmpsize;
+
+ {
+ cdf_header_t cdf_header;
+ cdf_offset = read_next_cdf(cdf_offset, &cdf_header);
+ if (zip_header.formatted.flags & 0x0008) {
+ /* 0x0008 - streaming. [u]cmpsize can be reliably gotten
+ * only from Central Directory. See unzip_doc.txt */
+ zip_header.formatted.crc32 = cdf_header.formatted.crc32;
+ zip_header.formatted.cmpsize = cdf_header.formatted.cmpsize;
+ zip_header.formatted.ucmpsize = cdf_header.formatted.ucmpsize;
+ }
+ if ((cdf_header.formatted.version_made_by >> 8) == 3) {
+ /* this archive is created on Unix */
+ dir_mode = file_mode = (cdf_header.formatted.external_file_attributes >> 16);
+ }
}
#endif
@@ -550,7 +579,7 @@ int unzip_main(int argc, char **argv)
printf(" creating: %s\n", dst_fn);
}
unzip_create_leading_dirs(dst_fn);
- if (bb_make_directory(dst_fn, 0777, 0)) {
+ if (bb_make_directory(dst_fn, dir_mode, 0)) {
bb_error_msg_and_die("exiting");
}
} else {
@@ -592,7 +621,11 @@ int unzip_main(int argc, char **argv)
overwrite = O_ALWAYS;
case 'y': /* Open file and fall into unzip */
unzip_create_leading_dirs(dst_fn);
+#if ENABLE_DESKTOP
+ dst_fd = xopen3(dst_fn, O_WRONLY | O_CREAT | O_TRUNC, file_mode);
+#else
dst_fd = xopen(dst_fn, O_WRONLY | O_CREAT | O_TRUNC);
+#endif
case -1: /* Unzip */
if (!quiet) {
printf(" inflating: %s\n", dst_fn);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-17 10:12:02 +0000