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function old new delta DESKTOP off: unzip_main 1648 1629 -19 DESKTOP=y: unzip_main 1939 2197 +258 Without this, midnight commander can't display .zip files Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
656 lines
19 KiB
C
656 lines
19 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini unzip implementation for busybox
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*
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* Copyright (C) 2004 by Ed Clark
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*
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* Loosely based on original busybox unzip applet by Laurence Anderson.
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* All options and features should work in this version.
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*
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* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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*/
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/* For reference see
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* http://www.pkware.com/company/standards/appnote/
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* http://www.info-zip.org/pub/infozip/doc/appnote-iz-latest.zip
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*/
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/* TODO
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* Zip64 + other methods
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*/
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#include "libbb.h"
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#include "unarchive.h"
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enum {
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#if BB_BIG_ENDIAN
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ZIP_FILEHEADER_MAGIC = 0x504b0304,
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ZIP_CDS_MAGIC = 0x504b0102,
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ZIP_CDE_MAGIC = 0x504b0506,
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ZIP_DD_MAGIC = 0x504b0708,
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#else
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ZIP_FILEHEADER_MAGIC = 0x04034b50,
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ZIP_CDS_MAGIC = 0x02014b50,
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ZIP_CDE_MAGIC = 0x06054b50,
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ZIP_DD_MAGIC = 0x08074b50,
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#endif
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};
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#define ZIP_HEADER_LEN 26
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typedef union {
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uint8_t raw[ZIP_HEADER_LEN];
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struct {
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uint16_t version; /* 0-1 */
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uint16_t flags; /* 2-3 */
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uint16_t method; /* 4-5 */
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uint16_t modtime; /* 6-7 */
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uint16_t moddate; /* 8-9 */
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uint32_t crc32 PACKED; /* 10-13 */
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uint32_t cmpsize PACKED; /* 14-17 */
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uint32_t ucmpsize PACKED; /* 18-21 */
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uint16_t filename_len; /* 22-23 */
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uint16_t extra_len; /* 24-25 */
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} formatted PACKED;
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} zip_header_t; /* PACKED - gcc 4.2.1 doesn't like it (spews warning) */
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/* Check the offset of the last element, not the length. This leniency
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* allows for poor packing, whereby the overall struct may be too long,
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* even though the elements are all in the right place.
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*/
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struct BUG_zip_header_must_be_26_bytes {
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char BUG_zip_header_must_be_26_bytes[
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offsetof(zip_header_t, formatted.extra_len) + 2
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== ZIP_HEADER_LEN ? 1 : -1];
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};
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#define FIX_ENDIANNESS_ZIP(zip_header) do { \
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(zip_header).formatted.version = SWAP_LE16((zip_header).formatted.version ); \
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(zip_header).formatted.flags = SWAP_LE16((zip_header).formatted.flags ); \
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(zip_header).formatted.method = SWAP_LE16((zip_header).formatted.method ); \
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(zip_header).formatted.modtime = SWAP_LE16((zip_header).formatted.modtime ); \
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(zip_header).formatted.moddate = SWAP_LE16((zip_header).formatted.moddate ); \
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(zip_header).formatted.crc32 = SWAP_LE32((zip_header).formatted.crc32 ); \
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(zip_header).formatted.cmpsize = SWAP_LE32((zip_header).formatted.cmpsize ); \
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(zip_header).formatted.ucmpsize = SWAP_LE32((zip_header).formatted.ucmpsize ); \
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(zip_header).formatted.filename_len = SWAP_LE16((zip_header).formatted.filename_len); \
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(zip_header).formatted.extra_len = SWAP_LE16((zip_header).formatted.extra_len ); \
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} while (0)
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#define CDS_HEADER_LEN 42
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typedef union {
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uint8_t raw[CDS_HEADER_LEN];
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struct {
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/* uint32_t signature; 50 4b 01 02 */
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uint16_t version_made_by; /* 0-1 */
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uint16_t version_needed; /* 2-3 */
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uint16_t cds_flags; /* 4-5 */
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uint16_t method; /* 6-7 */
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uint16_t mtime; /* 8-9 */
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uint16_t mdate; /* 10-11 */
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uint32_t crc32; /* 12-15 */
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uint32_t cmpsize; /* 16-19 */
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uint32_t ucmpsize; /* 20-23 */
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uint16_t file_name_length; /* 24-25 */
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uint16_t extra_field_length; /* 26-27 */
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uint16_t file_comment_length; /* 28-29 */
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uint16_t disk_number_start; /* 30-31 */
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uint16_t internal_file_attributes; /* 32-33 */
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uint32_t external_file_attributes PACKED; /* 34-37 */
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uint32_t relative_offset_of_local_header PACKED; /* 38-41 */
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} formatted PACKED;
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} cds_header_t;
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struct BUG_cds_header_must_be_42_bytes {
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char BUG_cds_header_must_be_42_bytes[
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offsetof(cds_header_t, formatted.relative_offset_of_local_header) + 4
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== CDS_HEADER_LEN ? 1 : -1];
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};
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#define FIX_ENDIANNESS_CDS(cds_header) do { \
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(cds_header).formatted.crc32 = SWAP_LE32((cds_header).formatted.crc32 ); \
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(cds_header).formatted.cmpsize = SWAP_LE32((cds_header).formatted.cmpsize ); \
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(cds_header).formatted.ucmpsize = SWAP_LE32((cds_header).formatted.ucmpsize ); \
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(cds_header).formatted.file_name_length = SWAP_LE16((cds_header).formatted.file_name_length); \
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(cds_header).formatted.extra_field_length = SWAP_LE16((cds_header).formatted.extra_field_length); \
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(cds_header).formatted.file_comment_length = SWAP_LE16((cds_header).formatted.file_comment_length); \
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} while (0)
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#define CDE_HEADER_LEN 16
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typedef union {
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uint8_t raw[CDE_HEADER_LEN];
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struct {
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/* uint32_t signature; 50 4b 05 06 */
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uint16_t this_disk_no;
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uint16_t disk_with_cds_no;
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uint16_t cds_entries_on_this_disk;
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uint16_t cds_entries_total;
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uint32_t cds_size;
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uint32_t cds_offset;
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/* uint16_t file_comment_length; */
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/* .ZIP file comment (variable size) */
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} formatted PACKED;
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} cde_header_t;
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struct BUG_cde_header_must_be_16_bytes {
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char BUG_cde_header_must_be_16_bytes[
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sizeof(cde_header_t) == CDE_HEADER_LEN ? 1 : -1];
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};
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#define FIX_ENDIANNESS_CDE(cde_header) do { \
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(cde_header).formatted.cds_offset = SWAP_LE32((cde_header).formatted.cds_offset); \
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} while (0)
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enum { zip_fd = 3 };
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#if ENABLE_DESKTOP
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/* NB: does not preserve file position! */
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static uint32_t find_cds_offset(void)
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{
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unsigned char buf[1024];
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cde_header_t cde_header;
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unsigned char *p;
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off_t end;
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end = xlseek(zip_fd, 0, SEEK_END);
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if (end < 1024)
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end = 1024;
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end -= 1024;
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xlseek(zip_fd, end, SEEK_SET);
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full_read(zip_fd, buf, 1024);
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p = buf;
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while (p <= buf + 1024 - CDE_HEADER_LEN - 4) {
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if (*p != 'P') {
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p++;
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continue;
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}
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if (*++p != 'K')
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continue;
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if (*++p != 5)
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continue;
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if (*++p != 6)
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continue;
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/* we found CDE! */
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memcpy(cde_header.raw, p + 1, CDE_HEADER_LEN);
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FIX_ENDIANNESS_CDE(cde_header);
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return cde_header.formatted.cds_offset;
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}
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bb_error_msg_and_die("can't find file table");
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};
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static uint32_t read_next_cds(int count_m1, uint32_t cds_offset, cds_header_t *cds_ptr)
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{
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off_t org;
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org = xlseek(zip_fd, 0, SEEK_CUR);
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if (!cds_offset)
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cds_offset = find_cds_offset();
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while (count_m1-- >= 0) {
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xlseek(zip_fd, cds_offset + 4, SEEK_SET);
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xread(zip_fd, cds_ptr->raw, CDS_HEADER_LEN);
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FIX_ENDIANNESS_CDS(*cds_ptr);
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cds_offset += 4 + CDS_HEADER_LEN
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+ cds_ptr->formatted.file_name_length
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+ cds_ptr->formatted.extra_field_length
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+ cds_ptr->formatted.file_comment_length;
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}
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xlseek(zip_fd, org, SEEK_SET);
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return cds_offset;
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};
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#endif
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static void unzip_skip(off_t skip)
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{
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if (lseek(zip_fd, skip, SEEK_CUR) == (off_t)-1)
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bb_copyfd_exact_size(zip_fd, -1, skip);
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}
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static void unzip_create_leading_dirs(const char *fn)
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{
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/* Create all leading directories */
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char *name = xstrdup(fn);
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if (bb_make_directory(dirname(name), 0777, FILEUTILS_RECUR)) {
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bb_error_msg_and_die("exiting"); /* bb_make_directory is noisy */
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}
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free(name);
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}
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static void unzip_extract(zip_header_t *zip_header, int dst_fd)
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{
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if (zip_header->formatted.method == 0) {
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/* Method 0 - stored (not compressed) */
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off_t size = zip_header->formatted.ucmpsize;
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if (size)
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bb_copyfd_exact_size(zip_fd, dst_fd, size);
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} else {
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/* Method 8 - inflate */
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inflate_unzip_result res;
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if (inflate_unzip(&res, zip_header->formatted.cmpsize, zip_fd, dst_fd) < 0)
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bb_error_msg_and_die("inflate error");
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/* Validate decompression - crc */
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if (zip_header->formatted.crc32 != (res.crc ^ 0xffffffffL)) {
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bb_error_msg_and_die("crc error");
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}
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/* Validate decompression - size */
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if (zip_header->formatted.ucmpsize != res.bytes_out) {
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/* Don't die. Who knows, maybe len calculation
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* was botched somewhere. After all, crc matched! */
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bb_error_msg("bad length");
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}
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}
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}
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int unzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int unzip_main(int argc, char **argv)
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{
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enum { O_PROMPT, O_NEVER, O_ALWAYS };
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zip_header_t zip_header;
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smallint quiet = 0;
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IF_NOT_DESKTOP(const) smallint verbose = 0;
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smallint listing = 0;
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smallint overwrite = O_PROMPT;
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#if ENABLE_DESKTOP
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uint32_t cds_offset;
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unsigned cds_entries;
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#endif
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unsigned long total_usize;
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unsigned long total_size;
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unsigned total_entries;
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int dst_fd = -1;
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char *src_fn = NULL;
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char *dst_fn = NULL;
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llist_t *zaccept = NULL;
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llist_t *zreject = NULL;
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char *base_dir = NULL;
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int i, opt;
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int opt_range = 0;
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char key_buf[80];
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struct stat stat_buf;
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/* -q, -l and -v: UnZip 5.52 of 28 February 2005, by Info-ZIP:
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*
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* # /usr/bin/unzip -qq -v decompress_unlzma.i.zip
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* 204372 Defl:N 35278 83% 09-06-09 14:23 0d056252 decompress_unlzma.i
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* # /usr/bin/unzip -q -v decompress_unlzma.i.zip
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* Length Method Size Ratio Date Time CRC-32 Name
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* -------- ------ ------- ----- ---- ---- ------ ----
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* 204372 Defl:N 35278 83% 09-06-09 14:23 0d056252 decompress_unlzma.i
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* -------- ------- --- -------
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* 204372 35278 83% 1 file
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* # /usr/bin/unzip -v decompress_unlzma.i.zip
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* Archive: decompress_unlzma.i.zip
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* Length Method Size Ratio Date Time CRC-32 Name
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* -------- ------ ------- ----- ---- ---- ------ ----
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* 204372 Defl:N 35278 83% 09-06-09 14:23 0d056252 decompress_unlzma.i
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* -------- ------- --- -------
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* 204372 35278 83% 1 file
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* # unzip -v decompress_unlzma.i.zip
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* Archive: decompress_unlzma.i.zip
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* Length Date Time Name
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* -------- ---- ---- ----
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* 204372 09-06-09 14:23 decompress_unlzma.i
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* -------- -------
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* 204372 1 files
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* # /usr/bin/unzip -l -qq decompress_unlzma.i.zip
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* 204372 09-06-09 14:23 decompress_unlzma.i
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* # /usr/bin/unzip -l -q decompress_unlzma.i.zip
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* Length Date Time Name
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* -------- ---- ---- ----
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* 204372 09-06-09 14:23 decompress_unlzma.i
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* -------- -------
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* 204372 1 file
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* # /usr/bin/unzip -l decompress_unlzma.i.zip
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* Archive: decompress_unlzma.i.zip
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* Length Date Time Name
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* -------- ---- ---- ----
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* 204372 09-06-09 14:23 decompress_unlzma.i
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* -------- -------
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* 204372 1 file
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*/
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/* '-' makes getopt return 1 for non-options */
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while ((opt = getopt(argc, argv, "-d:lnopqxv")) != -1) {
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switch (opt_range) {
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case 0: /* Options */
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switch (opt) {
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case 'l': /* List */
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listing = 1;
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break;
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case 'n': /* Never overwrite existing files */
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overwrite = O_NEVER;
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break;
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case 'o': /* Always overwrite existing files */
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overwrite = O_ALWAYS;
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break;
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case 'p': /* Extract files to stdout and fall through to set verbosity */
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dst_fd = STDOUT_FILENO;
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case 'q': /* Be quiet */
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quiet++;
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break;
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case 'v': /* Verbose list */
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IF_DESKTOP(verbose++;)
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listing = 1;
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break;
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case 1: /* The zip file */
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/* +5: space for ".zip" and NUL */
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src_fn = xmalloc(strlen(optarg) + 5);
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strcpy(src_fn, optarg);
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opt_range++;
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break;
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default:
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bb_show_usage();
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}
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break;
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case 1: /* Include files */
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if (opt == 1) {
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llist_add_to(&zaccept, optarg);
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break;
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}
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if (opt == 'd') {
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base_dir = optarg;
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opt_range += 2;
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break;
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}
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if (opt == 'x') {
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opt_range++;
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break;
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}
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bb_show_usage();
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case 2 : /* Exclude files */
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if (opt == 1) {
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llist_add_to(&zreject, optarg);
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break;
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}
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if (opt == 'd') { /* Extract to base directory */
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base_dir = optarg;
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opt_range++;
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break;
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}
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/* fall through */
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default:
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bb_show_usage();
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}
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}
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if (src_fn == NULL) {
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bb_show_usage();
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}
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/* Open input file */
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if (LONE_DASH(src_fn)) {
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xdup2(STDIN_FILENO, zip_fd);
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/* Cannot use prompt mode since zip data is arriving on STDIN */
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if (overwrite == O_PROMPT)
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overwrite = O_NEVER;
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} else {
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static const char extn[][5] = {"", ".zip", ".ZIP"};
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int orig_src_fn_len = strlen(src_fn);
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int src_fd = -1;
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for (i = 0; (i < 3) && (src_fd == -1); i++) {
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strcpy(src_fn + orig_src_fn_len, extn[i]);
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src_fd = open(src_fn, O_RDONLY);
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}
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if (src_fd == -1) {
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src_fn[orig_src_fn_len] = '\0';
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bb_error_msg_and_die("can't open %s, %s.zip, %s.ZIP", src_fn, src_fn, src_fn);
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}
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xmove_fd(src_fd, zip_fd);
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}
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/* Change dir if necessary */
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if (base_dir)
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xchdir(base_dir);
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if (quiet <= 1) { /* not -qq */
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if (quiet == 0)
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printf("Archive: %s\n", src_fn);
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if (listing) {
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puts(verbose ?
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" Length Method Size Ratio Date Time CRC-32 Name\n"
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"-------- ------ ------- ----- ---- ---- ------ ----"
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:
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" Length Date Time Name\n"
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" -------- ---- ---- ----"
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);
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}
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}
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total_usize = 0;
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total_size = 0;
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total_entries = 0;
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#if ENABLE_DESKTOP
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cds_entries = 0;
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cds_offset = 0;
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#endif
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while (1) {
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uint32_t magic;
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/* Check magic number */
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xread(zip_fd, &magic, 4);
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/* Central directory? It's at the end, so exit */
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if (magic == ZIP_CDS_MAGIC)
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break;
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#if ENABLE_DESKTOP
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/* Data descriptor? It was a streaming file, go on */
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if (magic == ZIP_DD_MAGIC) {
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/* skip over duplicate crc32, cmpsize and ucmpsize */
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unzip_skip(3 * 4);
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continue;
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}
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#endif
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if (magic != ZIP_FILEHEADER_MAGIC)
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bb_error_msg_and_die("invalid zip magic %08X", (int)magic);
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/* Read the file header */
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xread(zip_fd, zip_header.raw, ZIP_HEADER_LEN);
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FIX_ENDIANNESS_ZIP(zip_header);
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if ((zip_header.formatted.method != 0) && (zip_header.formatted.method != 8)) {
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|
bb_error_msg_and_die("unsupported method %d", zip_header.formatted.method);
|
|
}
|
|
#if !ENABLE_DESKTOP
|
|
if (zip_header.formatted.flags & 0x0009) {
|
|
bb_error_msg_and_die("zip flags 1 and 8 are not supported");
|
|
}
|
|
#else
|
|
if (zip_header.formatted.flags & 0x0001) {
|
|
/* 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;
|
|
}
|
|
#endif
|
|
|
|
/* Read filename */
|
|
free(dst_fn);
|
|
dst_fn = xzalloc(zip_header.formatted.filename_len + 1);
|
|
xread(zip_fd, dst_fn, zip_header.formatted.filename_len);
|
|
|
|
/* Skip extra header bytes */
|
|
unzip_skip(zip_header.formatted.extra_len);
|
|
|
|
/* Filter zip entries */
|
|
if (find_list_entry(zreject, dst_fn)
|
|
|| (zaccept && !find_list_entry(zaccept, dst_fn))
|
|
) { /* Skip entry */
|
|
i = 'n';
|
|
|
|
} else { /* Extract entry */
|
|
if (listing) { /* List entry */
|
|
unsigned dostime = zip_header.formatted.modtime | (zip_header.formatted.moddate << 16);
|
|
if (!verbose) {
|
|
// " Length Date Time Name\n"
|
|
// " -------- ---- ---- ----"
|
|
printf( "%9u %02u-%02u-%02u %02u:%02u %s\n",
|
|
(unsigned)zip_header.formatted.ucmpsize,
|
|
(dostime & 0x01e00000) >> 21,
|
|
(dostime & 0x001f0000) >> 16,
|
|
(((dostime & 0xfe000000) >> 25) + 1980) % 100,
|
|
(dostime & 0x0000f800) >> 11,
|
|
(dostime & 0x000007e0) >> 5,
|
|
dst_fn);
|
|
total_usize += zip_header.formatted.ucmpsize;
|
|
} else {
|
|
unsigned long percents = zip_header.formatted.ucmpsize - zip_header.formatted.cmpsize;
|
|
percents = percents * 100;
|
|
if (zip_header.formatted.ucmpsize)
|
|
percents /= zip_header.formatted.ucmpsize;
|
|
// " Length Method Size Ratio Date Time CRC-32 Name\n"
|
|
// "-------- ------ ------- ----- ---- ---- ------ ----"
|
|
printf( "%8u Defl:N" "%9u%4u%% %02u-%02u-%02u %02u:%02u %08x %s\n",
|
|
(unsigned)zip_header.formatted.ucmpsize,
|
|
(unsigned)zip_header.formatted.cmpsize,
|
|
(unsigned)percents,
|
|
(dostime & 0x01e00000) >> 21,
|
|
(dostime & 0x001f0000) >> 16,
|
|
(((dostime & 0xfe000000) >> 25) + 1980) % 100,
|
|
(dostime & 0x0000f800) >> 11,
|
|
(dostime & 0x000007e0) >> 5,
|
|
zip_header.formatted.crc32,
|
|
dst_fn);
|
|
total_usize += zip_header.formatted.ucmpsize;
|
|
total_size += zip_header.formatted.cmpsize;
|
|
}
|
|
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("can't stat '%s'", dst_fn);
|
|
}
|
|
if (!quiet) {
|
|
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("exiting");
|
|
}
|
|
} 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("can't 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, sizeof(key_buf), stdin)) {
|
|
bb_perror_msg_and_die("can't 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);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
switch (i) {
|
|
case 'A':
|
|
overwrite = O_ALWAYS;
|
|
case 'y': /* Open file and fall into unzip */
|
|
unzip_create_leading_dirs(dst_fn);
|
|
dst_fd = xopen(dst_fn, O_WRONLY | O_CREAT | O_TRUNC);
|
|
case -1: /* Unzip */
|
|
if (!quiet) {
|
|
printf(" inflating: %s\n", dst_fn);
|
|
}
|
|
unzip_extract(&zip_header, dst_fd);
|
|
if (dst_fd != STDOUT_FILENO) {
|
|
/* closing STDOUT is potentially bad for future business */
|
|
close(dst_fd);
|
|
}
|
|
break;
|
|
|
|
case 'N':
|
|
overwrite = O_NEVER;
|
|
case 'n':
|
|
/* Skip entry data */
|
|
unzip_skip(zip_header.formatted.cmpsize);
|
|
break;
|
|
|
|
case 'r':
|
|
/* Prompt for new name */
|
|
printf("new name: ");
|
|
if (!fgets(key_buf, sizeof(key_buf), stdin)) {
|
|
bb_perror_msg_and_die("can't read input");
|
|
}
|
|
free(dst_fn);
|
|
dst_fn = xstrdup(key_buf);
|
|
chomp(dst_fn);
|
|
goto check_file;
|
|
|
|
default:
|
|
printf("error: invalid response [%c]\n", (char)i);
|
|
goto check_file;
|
|
}
|
|
|
|
total_entries++;
|
|
}
|
|
|
|
if (listing && quiet <= 1) {
|
|
if (!verbose) {
|
|
// " Length Date Time Name\n"
|
|
// " -------- ---- ---- ----"
|
|
printf( " -------- -------\n"
|
|
"%9lu" " %u files\n",
|
|
total_usize, total_entries);
|
|
} else {
|
|
unsigned long percents = total_usize - total_size;
|
|
percents = percents * 100;
|
|
if (total_usize)
|
|
percents /= total_usize;
|
|
// " Length Method Size Ratio Date Time CRC-32 Name\n"
|
|
// "-------- ------ ------- ----- ---- ---- ------ ----"
|
|
printf( "-------- ------- --- -------\n"
|
|
"%8lu" "%17lu%4u%% %u files\n",
|
|
total_usize, total_size, (unsigned)percents,
|
|
total_entries);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|