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zip_dirent.c
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/*
zip_dirent.c -- read directory entry (local or central), clean dirent
Copyright (C) 1999-2021 Dieter Baron and Thomas Klausner
This file is part of libzip, a library to manipulate ZIP archives.
The authors can be contacted at <[email protected]>
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
3. The names of the authors may not be used to endorse or promote
products derived from this software without specific prior
written permission.
THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <time.h>
#include "zipint.h"
static zip_string_t *_zip_dirent_process_ef_utf_8(const zip_dirent_t *de, zip_uint16_t id, zip_string_t *str);
static zip_extra_field_t *_zip_ef_utf8(zip_uint16_t, zip_string_t *, zip_error_t *);
static bool _zip_dirent_process_winzip_aes(zip_dirent_t *de, zip_error_t *error);
void
_zip_cdir_free(zip_cdir_t *cd) {
zip_uint64_t i;
if (!cd)
return;
for (i = 0; i < cd->nentry; i++)
_zip_entry_finalize(cd->entry + i);
free(cd->entry);
_zip_string_free(cd->comment);
free(cd);
}
zip_cdir_t *
_zip_cdir_new(zip_uint64_t nentry, zip_error_t *error) {
zip_cdir_t *cd;
if ((cd = (zip_cdir_t *)malloc(sizeof(*cd))) == NULL) {
zip_error_set(error, ZIP_ER_MEMORY, 0);
return NULL;
}
cd->entry = NULL;
cd->nentry = cd->nentry_alloc = 0;
cd->size = cd->offset = 0;
cd->comment = NULL;
cd->is_zip64 = false;
if (!_zip_cdir_grow(cd, nentry, error)) {
_zip_cdir_free(cd);
return NULL;
}
return cd;
}
bool
_zip_cdir_grow(zip_cdir_t *cd, zip_uint64_t additional_entries, zip_error_t *error) {
zip_uint64_t i, new_alloc;
zip_entry_t *new_entry;
if (additional_entries == 0) {
return true;
}
new_alloc = cd->nentry_alloc + additional_entries;
if (new_alloc < additional_entries || new_alloc > SIZE_MAX / sizeof(*(cd->entry))) {
zip_error_set(error, ZIP_ER_MEMORY, 0);
return false;
}
if ((new_entry = (zip_entry_t *)realloc(cd->entry, sizeof(*(cd->entry)) * (size_t)new_alloc)) == NULL) {
zip_error_set(error, ZIP_ER_MEMORY, 0);
return false;
}
cd->entry = new_entry;
for (i = cd->nentry; i < new_alloc; i++) {
_zip_entry_init(cd->entry + i);
}
cd->nentry = cd->nentry_alloc = new_alloc;
return true;
}
zip_int64_t
_zip_cdir_write(zip_t *za, const zip_filelist_t *filelist, zip_uint64_t survivors) {
zip_uint64_t offset, size;
zip_string_t *comment;
zip_uint8_t buf[EOCDLEN + EOCD64LEN + EOCD64LOCLEN];
zip_buffer_t *buffer;
zip_int64_t off;
zip_uint64_t i;
bool is_zip64;
int ret;
if ((off = zip_source_tell_write(za->src)) < 0) {
_zip_error_set_from_source(&za->error, za->src);
return -1;
}
offset = (zip_uint64_t)off;
is_zip64 = false;
for (i = 0; i < survivors; i++) {
zip_entry_t *entry = za->entry + filelist[i].idx;
if ((ret = _zip_dirent_write(za, entry->changes ? entry->changes : entry->orig, ZIP_FL_CENTRAL)) < 0)
return -1;
if (ret)
is_zip64 = true;
}
if ((off = zip_source_tell_write(za->src)) < 0) {
_zip_error_set_from_source(&za->error, za->src);
return -1;
}
size = (zip_uint64_t)off - offset;
if (offset > ZIP_UINT32_MAX || survivors > ZIP_UINT16_MAX)
is_zip64 = true;
if ((buffer = _zip_buffer_new(buf, sizeof(buf))) == NULL) {
zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
return -1;
}
if (is_zip64) {
_zip_buffer_put(buffer, EOCD64_MAGIC, 4);
_zip_buffer_put_64(buffer, EOCD64LEN - 12);
_zip_buffer_put_16(buffer, 45);
_zip_buffer_put_16(buffer, 45);
_zip_buffer_put_32(buffer, 0);
_zip_buffer_put_32(buffer, 0);
_zip_buffer_put_64(buffer, survivors);
_zip_buffer_put_64(buffer, survivors);
_zip_buffer_put_64(buffer, size);
_zip_buffer_put_64(buffer, offset);
_zip_buffer_put(buffer, EOCD64LOC_MAGIC, 4);
_zip_buffer_put_32(buffer, 0);
_zip_buffer_put_64(buffer, offset + size);
_zip_buffer_put_32(buffer, 1);
}
_zip_buffer_put(buffer, EOCD_MAGIC, 4);
_zip_buffer_put_32(buffer, 0);
_zip_buffer_put_16(buffer, (zip_uint16_t)(survivors >= ZIP_UINT16_MAX ? ZIP_UINT16_MAX : survivors));
_zip_buffer_put_16(buffer, (zip_uint16_t)(survivors >= ZIP_UINT16_MAX ? ZIP_UINT16_MAX : survivors));
_zip_buffer_put_32(buffer, size >= ZIP_UINT32_MAX ? ZIP_UINT32_MAX : (zip_uint32_t)size);
_zip_buffer_put_32(buffer, offset >= ZIP_UINT32_MAX ? ZIP_UINT32_MAX : (zip_uint32_t)offset);
comment = za->comment_changed ? za->comment_changes : za->comment_orig;
_zip_buffer_put_16(buffer, (zip_uint16_t)(comment ? comment->length : 0));
if (!_zip_buffer_ok(buffer)) {
zip_error_set(&za->error, ZIP_ER_INTERNAL, 0);
_zip_buffer_free(buffer);
return -1;
}
if (_zip_write(za, _zip_buffer_data(buffer), _zip_buffer_offset(buffer)) < 0) {
_zip_buffer_free(buffer);
return -1;
}
_zip_buffer_free(buffer);
if (comment) {
if (_zip_write(za, comment->raw, comment->length) < 0) {
return -1;
}
}
return (zip_int64_t)size;
}
zip_dirent_t *
_zip_dirent_clone(const zip_dirent_t *sde) {
zip_dirent_t *tde;
if ((tde = (zip_dirent_t *)malloc(sizeof(*tde))) == NULL)
return NULL;
if (sde)
memcpy(tde, sde, sizeof(*sde));
else
_zip_dirent_init(tde);
tde->changed = 0;
tde->cloned = 1;
return tde;
}
void
_zip_dirent_finalize(zip_dirent_t *zde) {
if (!zde->cloned || zde->changed & ZIP_DIRENT_FILENAME) {
_zip_string_free(zde->filename);
zde->filename = NULL;
}
if (!zde->cloned || zde->changed & ZIP_DIRENT_EXTRA_FIELD) {
_zip_ef_free(zde->extra_fields);
zde->extra_fields = NULL;
}
if (!zde->cloned || zde->changed & ZIP_DIRENT_COMMENT) {
_zip_string_free(zde->comment);
zde->comment = NULL;
}
if (!zde->cloned || zde->changed & ZIP_DIRENT_PASSWORD) {
if (zde->password) {
_zip_crypto_clear(zde->password, strlen(zde->password));
}
free(zde->password);
zde->password = NULL;
}
}
void
_zip_dirent_free(zip_dirent_t *zde) {
if (zde == NULL)
return;
_zip_dirent_finalize(zde);
free(zde);
}
void
_zip_dirent_init(zip_dirent_t *de) {
de->changed = 0;
de->local_extra_fields_read = 0;
de->cloned = 0;
de->crc_valid = true;
de->version_madeby = 63 | (ZIP_OPSYS_DEFAULT << 8);
de->version_needed = 10; /* 1.0 */
de->bitflags = 0;
de->comp_method = ZIP_CM_DEFAULT;
de->last_mod = 0;
de->crc = 0;
de->comp_size = 0;
de->uncomp_size = 0;
de->filename = NULL;
de->extra_fields = NULL;
de->comment = NULL;
de->disk_number = 0;
de->int_attrib = 0;
de->ext_attrib = ZIP_EXT_ATTRIB_DEFAULT;
de->offset = 0;
de->compression_level = 0;
de->encryption_method = ZIP_EM_NONE;
de->password = NULL;
}
bool
_zip_dirent_needs_zip64(const zip_dirent_t *de, zip_flags_t flags) {
if (de->uncomp_size >= ZIP_UINT32_MAX || de->comp_size >= ZIP_UINT32_MAX || ((flags & ZIP_FL_CENTRAL) && de->offset >= ZIP_UINT32_MAX))
return true;
return false;
}
zip_dirent_t *
_zip_dirent_new(void) {
zip_dirent_t *de;
if ((de = (zip_dirent_t *)malloc(sizeof(*de))) == NULL)
return NULL;
_zip_dirent_init(de);
return de;
}
/* _zip_dirent_read(zde, fp, bufp, left, localp, error):
Fills the zip directory entry zde.
If buffer is non-NULL, data is taken from there; otherwise data is read from fp as needed.
If local is true, it reads a local header instead of a central directory entry.
Returns size of dirent read if successful. On error, error is filled in and -1 is returned.
*/
zip_int64_t
_zip_dirent_read(zip_dirent_t *zde, zip_source_t *src, zip_buffer_t *buffer, bool local, zip_error_t *error) {
zip_uint8_t buf[CDENTRYSIZE];
zip_uint16_t dostime, dosdate;
zip_uint32_t size, variable_size;
zip_uint16_t filename_len, comment_len, ef_len;
bool from_buffer = (buffer != NULL);
size = local ? LENTRYSIZE : CDENTRYSIZE;
if (buffer) {
if (_zip_buffer_left(buffer) < size) {
zip_error_set(error, ZIP_ER_NOZIP, 0);
return -1;
}
}
else {
if ((buffer = _zip_buffer_new_from_source(src, size, buf, error)) == NULL) {
return -1;
}
}
if (memcmp(_zip_buffer_get(buffer, 4), (local ? LOCAL_MAGIC : CENTRAL_MAGIC), 4) != 0) {
zip_error_set(error, ZIP_ER_NOZIP, 0);
if (!from_buffer) {
_zip_buffer_free(buffer);
}
return -1;
}
/* convert buffercontents to zip_dirent */
_zip_dirent_init(zde);
if (!local)
zde->version_madeby = _zip_buffer_get_16(buffer);
else
zde->version_madeby = 0;
zde->version_needed = _zip_buffer_get_16(buffer);
zde->bitflags = _zip_buffer_get_16(buffer);
zde->comp_method = _zip_buffer_get_16(buffer);
/* convert to time_t */
dostime = _zip_buffer_get_16(buffer);
dosdate = _zip_buffer_get_16(buffer);
zde->last_mod = _zip_d2u_time(dostime, dosdate);
zde->crc = _zip_buffer_get_32(buffer);
zde->comp_size = _zip_buffer_get_32(buffer);
zde->uncomp_size = _zip_buffer_get_32(buffer);
filename_len = _zip_buffer_get_16(buffer);
ef_len = _zip_buffer_get_16(buffer);
if (local) {
comment_len = 0;
zde->disk_number = 0;
zde->int_attrib = 0;
zde->ext_attrib = 0;
zde->offset = 0;
}
else {
comment_len = _zip_buffer_get_16(buffer);
zde->disk_number = _zip_buffer_get_16(buffer);
zde->int_attrib = _zip_buffer_get_16(buffer);
zde->ext_attrib = _zip_buffer_get_32(buffer);
zde->offset = _zip_buffer_get_32(buffer);
}
if (!_zip_buffer_ok(buffer)) {
zip_error_set(error, ZIP_ER_INTERNAL, 0);
if (!from_buffer) {
_zip_buffer_free(buffer);
}
return -1;
}
if (zde->bitflags & ZIP_GPBF_ENCRYPTED) {
if (zde->bitflags & ZIP_GPBF_STRONG_ENCRYPTION) {
/* TODO */
zde->encryption_method = ZIP_EM_UNKNOWN;
}
else {
zde->encryption_method = ZIP_EM_TRAD_PKWARE;
}
}
else {
zde->encryption_method = ZIP_EM_NONE;
}
zde->filename = NULL;
zde->extra_fields = NULL;
zde->comment = NULL;
variable_size = (zip_uint32_t)filename_len + (zip_uint32_t)ef_len + (zip_uint32_t)comment_len;
if (from_buffer) {
if (_zip_buffer_left(buffer) < variable_size) {
zip_error_set(error, ZIP_ER_INCONS, ZIP_ER_DETAIL_VARIABLE_SIZE_OVERFLOW);
return -1;
}
}
else {
_zip_buffer_free(buffer);
if ((buffer = _zip_buffer_new_from_source(src, variable_size, NULL, error)) == NULL) {
return -1;
}
}
if (filename_len) {
zde->filename = _zip_read_string(buffer, src, filename_len, 1, error);
if (!zde->filename) {
if (zip_error_code_zip(error) == ZIP_ER_EOF) {
zip_error_set(error, ZIP_ER_INCONS, ZIP_ER_DETAIL_VARIABLE_SIZE_OVERFLOW);
}
if (!from_buffer) {
_zip_buffer_free(buffer);
}
return -1;
}
if (zde->bitflags & ZIP_GPBF_ENCODING_UTF_8) {
if (_zip_guess_encoding(zde->filename, ZIP_ENCODING_UTF8_KNOWN) == ZIP_ENCODING_ERROR) {
zip_error_set(error, ZIP_ER_INCONS, ZIP_ER_DETAIL_INVALID_UTF8_IN_FILENAME);
if (!from_buffer) {
_zip_buffer_free(buffer);
}
return -1;
}
}
}
if (ef_len) {
zip_uint8_t *ef = _zip_read_data(buffer, src, ef_len, 0, error);
if (ef == NULL) {
if (!from_buffer) {
_zip_buffer_free(buffer);
}
return -1;
}
if (!_zip_ef_parse(ef, ef_len, local ? ZIP_EF_LOCAL : ZIP_EF_CENTRAL, &zde->extra_fields, error)) {
free(ef);
if (!from_buffer) {
_zip_buffer_free(buffer);
}
return -1;
}
free(ef);
if (local)
zde->local_extra_fields_read = 1;
}
if (comment_len) {
zde->comment = _zip_read_string(buffer, src, comment_len, 0, error);
if (!zde->comment) {
if (!from_buffer) {
_zip_buffer_free(buffer);
}
return -1;
}
if (zde->bitflags & ZIP_GPBF_ENCODING_UTF_8) {
if (_zip_guess_encoding(zde->comment, ZIP_ENCODING_UTF8_KNOWN) == ZIP_ENCODING_ERROR) {
zip_error_set(error, ZIP_ER_INCONS, ZIP_ER_DETAIL_INVALID_UTF8_IN_COMMENT);
if (!from_buffer) {
_zip_buffer_free(buffer);
}
return -1;
}
}
}
zde->filename = _zip_dirent_process_ef_utf_8(zde, ZIP_EF_UTF_8_NAME, zde->filename);
zde->comment = _zip_dirent_process_ef_utf_8(zde, ZIP_EF_UTF_8_COMMENT, zde->comment);
/* Zip64 */
if (zde->uncomp_size == ZIP_UINT32_MAX || zde->comp_size == ZIP_UINT32_MAX || zde->offset == ZIP_UINT32_MAX) {
zip_uint16_t got_len;
zip_buffer_t *ef_buffer;
const zip_uint8_t *ef = _zip_ef_get_by_id(zde->extra_fields, &got_len, ZIP_EF_ZIP64, 0, local ? ZIP_EF_LOCAL : ZIP_EF_CENTRAL, error);
/* TODO: if got_len == 0 && !ZIP64_EOCD: no error, 0xffffffff is valid value */
if (ef == NULL) {
if (!from_buffer) {
_zip_buffer_free(buffer);
}
return -1;
}
if ((ef_buffer = _zip_buffer_new((zip_uint8_t *)ef, got_len)) == NULL) {
zip_error_set(error, ZIP_ER_MEMORY, 0);
if (!from_buffer) {
_zip_buffer_free(buffer);
}
return -1;
}
if (zde->uncomp_size == ZIP_UINT32_MAX) {
zde->uncomp_size = _zip_buffer_get_64(ef_buffer);
}
else if (local) {
/* From appnote.txt: This entry in the Local header MUST
include BOTH original and compressed file size fields. */
(void)_zip_buffer_skip(ef_buffer, 8); /* error is caught by _zip_buffer_eof() call */
}
if (zde->comp_size == ZIP_UINT32_MAX) {
zde->comp_size = _zip_buffer_get_64(ef_buffer);
}
if (!local) {
if (zde->offset == ZIP_UINT32_MAX) {
zde->offset = _zip_buffer_get_64(ef_buffer);
}
if (zde->disk_number == ZIP_UINT16_MAX) {
zde->disk_number = _zip_buffer_get_32(ef_buffer);
}
}
if (!_zip_buffer_eof(ef_buffer)) {
/* accept additional fields if values match */
bool ok = true;
switch (got_len) {
case 28:
_zip_buffer_set_offset(ef_buffer, 24);
if (zde->disk_number != _zip_buffer_get_32(ef_buffer)) {
ok = false;
}
/* fallthrough */
case 24:
_zip_buffer_set_offset(ef_buffer, 0);
if ((zde->uncomp_size != _zip_buffer_get_64(ef_buffer)) || (zde->comp_size != _zip_buffer_get_64(ef_buffer)) || (zde->offset != _zip_buffer_get_64(ef_buffer))) {
ok = false;
}
break;
default:
ok = false;
}
if (!ok) {
zip_error_set(error, ZIP_ER_INCONS, ZIP_ER_DETAIL_INVALID_ZIP64_EF);
_zip_buffer_free(ef_buffer);
if (!from_buffer) {
_zip_buffer_free(buffer);
}
return -1;
}
}
_zip_buffer_free(ef_buffer);
}
if (!_zip_buffer_ok(buffer)) {
zip_error_set(error, ZIP_ER_INTERNAL, 0);
if (!from_buffer) {
_zip_buffer_free(buffer);
}
return -1;
}
if (!from_buffer) {
_zip_buffer_free(buffer);
}
/* zip_source_seek / zip_source_tell don't support values > ZIP_INT64_MAX */
if (zde->offset > ZIP_INT64_MAX) {
zip_error_set(error, ZIP_ER_SEEK, EFBIG);
return -1;
}
if (!_zip_dirent_process_winzip_aes(zde, error)) {
return -1;
}
zde->extra_fields = _zip_ef_remove_internal(zde->extra_fields);
return (zip_int64_t)size + (zip_int64_t)variable_size;
}
static zip_string_t *
_zip_dirent_process_ef_utf_8(const zip_dirent_t *de, zip_uint16_t id, zip_string_t *str) {
zip_uint16_t ef_len;
zip_uint32_t ef_crc;
zip_buffer_t *buffer;
const zip_uint8_t *ef = _zip_ef_get_by_id(de->extra_fields, &ef_len, id, 0, ZIP_EF_BOTH, NULL);
if (ef == NULL || ef_len < 5 || ef[0] != 1) {
return str;
}
if ((buffer = _zip_buffer_new((zip_uint8_t *)ef, ef_len)) == NULL) {
return str;
}
_zip_buffer_get_8(buffer);
ef_crc = _zip_buffer_get_32(buffer);
if (_zip_string_crc32(str) == ef_crc) {
zip_uint16_t len = (zip_uint16_t)_zip_buffer_left(buffer);
zip_string_t *ef_str = _zip_string_new(_zip_buffer_get(buffer, len), len, ZIP_FL_ENC_UTF_8, NULL);
if (ef_str != NULL) {
_zip_string_free(str);
str = ef_str;
}
}
_zip_buffer_free(buffer);
return str;
}
static bool
_zip_dirent_process_winzip_aes(zip_dirent_t *de, zip_error_t *error) {
zip_uint16_t ef_len;
zip_buffer_t *buffer;
const zip_uint8_t *ef;
bool crc_valid;
zip_uint16_t enc_method;
if (de->comp_method != ZIP_CM_WINZIP_AES) {
return true;
}
ef = _zip_ef_get_by_id(de->extra_fields, &ef_len, ZIP_EF_WINZIP_AES, 0, ZIP_EF_BOTH, NULL);
if (ef == NULL || ef_len < 7) {
zip_error_set(error, ZIP_ER_INCONS, ZIP_ER_DETAIL_INVALID_WINZIPAES_EF);
return false;
}
if ((buffer = _zip_buffer_new((zip_uint8_t *)ef, ef_len)) == NULL) {
zip_error_set(error, ZIP_ER_INTERNAL, 0);
return false;
}
/* version */
crc_valid = true;
switch (_zip_buffer_get_16(buffer)) {
case 1:
break;
case 2:
if (de->uncomp_size < 20 /* TODO: constant */) {
crc_valid = false;
}
break;
default:
zip_error_set(error, ZIP_ER_ENCRNOTSUPP, 0);
_zip_buffer_free(buffer);
return false;
}
/* vendor */
if (memcmp(_zip_buffer_get(buffer, 2), "AE", 2) != 0) {
zip_error_set(error, ZIP_ER_ENCRNOTSUPP, 0);
_zip_buffer_free(buffer);
return false;
}
/* mode */
switch (_zip_buffer_get_8(buffer)) {
case 1:
enc_method = ZIP_EM_AES_128;
break;
case 2:
enc_method = ZIP_EM_AES_192;
break;
case 3:
enc_method = ZIP_EM_AES_256;
break;
default:
zip_error_set(error, ZIP_ER_ENCRNOTSUPP, 0);
_zip_buffer_free(buffer);
return false;
}
if (ef_len != 7) {
zip_error_set(error, ZIP_ER_INCONS, ZIP_ER_DETAIL_INVALID_WINZIPAES_EF);
_zip_buffer_free(buffer);
return false;
}
de->crc_valid = crc_valid;
de->encryption_method = enc_method;
de->comp_method = _zip_buffer_get_16(buffer);
_zip_buffer_free(buffer);
return true;
}
zip_int32_t
_zip_dirent_size(zip_source_t *src, zip_uint16_t flags, zip_error_t *error) {
zip_int32_t size;
bool local = (flags & ZIP_EF_LOCAL) != 0;
int i;
zip_uint8_t b[6];
zip_buffer_t *buffer;
size = local ? LENTRYSIZE : CDENTRYSIZE;
if (zip_source_seek(src, local ? 26 : 28, SEEK_CUR) < 0) {
_zip_error_set_from_source(error, src);
return -1;
}
if ((buffer = _zip_buffer_new_from_source(src, local ? 4 : 6, b, error)) == NULL) {
return -1;
}
for (i = 0; i < (local ? 2 : 3); i++) {
size += _zip_buffer_get_16(buffer);
}
if (!_zip_buffer_eof(buffer)) {
zip_error_set(error, ZIP_ER_INTERNAL, 0);
_zip_buffer_free(buffer);
return -1;
}
_zip_buffer_free(buffer);
return size;
}
/* _zip_dirent_write
Writes zip directory entry.
If flags & ZIP_EF_LOCAL, it writes a local header instead of a central
directory entry. If flags & ZIP_EF_FORCE_ZIP64, a ZIP64 extra field is written, even if not needed.
Returns 0 if successful, 1 if successful and wrote ZIP64 extra field. On error, error is filled in and -1 is
returned.
*/
int
_zip_dirent_write(zip_t *za, zip_dirent_t *de, zip_flags_t flags) {
zip_uint16_t dostime, dosdate;
zip_encoding_type_t com_enc, name_enc;
zip_extra_field_t *ef;
zip_extra_field_t *ef64;
zip_uint32_t ef_total_size;
bool is_zip64;
bool is_really_zip64;
bool is_winzip_aes;
zip_uint8_t buf[CDENTRYSIZE];
zip_buffer_t *buffer;
ef = NULL;
name_enc = _zip_guess_encoding(de->filename, ZIP_ENCODING_UNKNOWN);
com_enc = _zip_guess_encoding(de->comment, ZIP_ENCODING_UNKNOWN);
if ((name_enc == ZIP_ENCODING_UTF8_KNOWN && com_enc == ZIP_ENCODING_ASCII) || (name_enc == ZIP_ENCODING_ASCII && com_enc == ZIP_ENCODING_UTF8_KNOWN) || (name_enc == ZIP_ENCODING_UTF8_KNOWN && com_enc == ZIP_ENCODING_UTF8_KNOWN))
de->bitflags |= ZIP_GPBF_ENCODING_UTF_8;
else {
de->bitflags &= (zip_uint16_t)~ZIP_GPBF_ENCODING_UTF_8;
if (name_enc == ZIP_ENCODING_UTF8_KNOWN) {
ef = _zip_ef_utf8(ZIP_EF_UTF_8_NAME, de->filename, &za->error);
if (ef == NULL)
return -1;
}
if ((flags & ZIP_FL_LOCAL) == 0 && com_enc == ZIP_ENCODING_UTF8_KNOWN) {
zip_extra_field_t *ef2 = _zip_ef_utf8(ZIP_EF_UTF_8_COMMENT, de->comment, &za->error);
if (ef2 == NULL) {
_zip_ef_free(ef);
return -1;
}
ef2->next = ef;
ef = ef2;
}
}
if (de->encryption_method == ZIP_EM_NONE) {
de->bitflags &= (zip_uint16_t)~ZIP_GPBF_ENCRYPTED;
}
else {
de->bitflags |= (zip_uint16_t)ZIP_GPBF_ENCRYPTED;
}
is_really_zip64 = _zip_dirent_needs_zip64(de, flags);
is_zip64 = (flags & (ZIP_FL_LOCAL | ZIP_FL_FORCE_ZIP64)) == (ZIP_FL_LOCAL | ZIP_FL_FORCE_ZIP64) || is_really_zip64;
is_winzip_aes = de->encryption_method == ZIP_EM_AES_128 || de->encryption_method == ZIP_EM_AES_192 || de->encryption_method == ZIP_EM_AES_256;
if (is_zip64) {
zip_uint8_t ef_zip64[EFZIP64SIZE];
zip_buffer_t *ef_buffer = _zip_buffer_new(ef_zip64, sizeof(ef_zip64));
if (ef_buffer == NULL) {
zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
_zip_ef_free(ef);
return -1;
}
if (flags & ZIP_FL_LOCAL) {
if ((flags & ZIP_FL_FORCE_ZIP64) || de->comp_size > ZIP_UINT32_MAX || de->uncomp_size > ZIP_UINT32_MAX) {
_zip_buffer_put_64(ef_buffer, de->uncomp_size);
_zip_buffer_put_64(ef_buffer, de->comp_size);
}
}
else {
if ((flags & ZIP_FL_FORCE_ZIP64) || de->comp_size > ZIP_UINT32_MAX || de->uncomp_size > ZIP_UINT32_MAX || de->offset > ZIP_UINT32_MAX) {
if (de->uncomp_size >= ZIP_UINT32_MAX) {
_zip_buffer_put_64(ef_buffer, de->uncomp_size);
}
if (de->comp_size >= ZIP_UINT32_MAX) {
_zip_buffer_put_64(ef_buffer, de->comp_size);
}
if (de->offset >= ZIP_UINT32_MAX) {
_zip_buffer_put_64(ef_buffer, de->offset);
}
}
}
if (!_zip_buffer_ok(ef_buffer)) {
zip_error_set(&za->error, ZIP_ER_INTERNAL, 0);
_zip_buffer_free(ef_buffer);
_zip_ef_free(ef);
return -1;
}
ef64 = _zip_ef_new(ZIP_EF_ZIP64, (zip_uint16_t)(_zip_buffer_offset(ef_buffer)), ef_zip64, ZIP_EF_BOTH);
_zip_buffer_free(ef_buffer);
ef64->next = ef;
ef = ef64;
}
if (is_winzip_aes) {
zip_uint8_t data[EF_WINZIP_AES_SIZE];
zip_buffer_t *ef_buffer = _zip_buffer_new(data, sizeof(data));
zip_extra_field_t *ef_winzip;
if (ef_buffer == NULL) {
zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
_zip_ef_free(ef);
return -1;
}
_zip_buffer_put_16(ef_buffer, 2);
_zip_buffer_put(ef_buffer, "AE", 2);
_zip_buffer_put_8(ef_buffer, (zip_uint8_t)(de->encryption_method & 0xff));
_zip_buffer_put_16(ef_buffer, (zip_uint16_t)de->comp_method);
if (!_zip_buffer_ok(ef_buffer)) {
zip_error_set(&za->error, ZIP_ER_INTERNAL, 0);
_zip_buffer_free(ef_buffer);
_zip_ef_free(ef);
return -1;
}
ef_winzip = _zip_ef_new(ZIP_EF_WINZIP_AES, EF_WINZIP_AES_SIZE, data, ZIP_EF_BOTH);
_zip_buffer_free(ef_buffer);
ef_winzip->next = ef;
ef = ef_winzip;
}
if ((buffer = _zip_buffer_new(buf, sizeof(buf))) == NULL) {
zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
_zip_ef_free(ef);
return -1;
}
_zip_buffer_put(buffer, (flags & ZIP_FL_LOCAL) ? LOCAL_MAGIC : CENTRAL_MAGIC, 4);
if ((flags & ZIP_FL_LOCAL) == 0) {
_zip_buffer_put_16(buffer, de->version_madeby);
}
_zip_buffer_put_16(buffer, ZIP_MAX(is_really_zip64 ? 45 : 0, de->version_needed));
_zip_buffer_put_16(buffer, de->bitflags);
if (is_winzip_aes) {
_zip_buffer_put_16(buffer, ZIP_CM_WINZIP_AES);
}
else {
_zip_buffer_put_16(buffer, (zip_uint16_t)de->comp_method);
}
_zip_u2d_time(de->last_mod, &dostime, &dosdate);
_zip_buffer_put_16(buffer, dostime);
_zip_buffer_put_16(buffer, dosdate);
if (is_winzip_aes && de->uncomp_size < 20) {
_zip_buffer_put_32(buffer, 0);
}
else {
_zip_buffer_put_32(buffer, de->crc);
}
if (((flags & ZIP_FL_LOCAL) == ZIP_FL_LOCAL) && ((de->comp_size >= ZIP_UINT32_MAX) || (de->uncomp_size >= ZIP_UINT32_MAX))) {
/* In local headers, if a ZIP64 EF is written, it MUST contain
* both compressed and uncompressed sizes (even if one of the
* two is smaller than 0xFFFFFFFF); on the other hand, those
* may only appear when the corresponding standard entry is
* 0xFFFFFFFF. (appnote.txt 4.5.3) */
_zip_buffer_put_32(buffer, ZIP_UINT32_MAX);
_zip_buffer_put_32(buffer, ZIP_UINT32_MAX);
}
else {
if (de->comp_size < ZIP_UINT32_MAX) {
_zip_buffer_put_32(buffer, (zip_uint32_t)de->comp_size);
}
else {
_zip_buffer_put_32(buffer, ZIP_UINT32_MAX);
}
if (de->uncomp_size < ZIP_UINT32_MAX) {
_zip_buffer_put_32(buffer, (zip_uint32_t)de->uncomp_size);
}
else {
_zip_buffer_put_32(buffer, ZIP_UINT32_MAX);
}
}
_zip_buffer_put_16(buffer, _zip_string_length(de->filename));
/* TODO: check for overflow */
ef_total_size = (zip_uint32_t)_zip_ef_size(de->extra_fields, flags) + (zip_uint32_t)_zip_ef_size(ef, ZIP_EF_BOTH);
_zip_buffer_put_16(buffer, (zip_uint16_t)ef_total_size);
if ((flags & ZIP_FL_LOCAL) == 0) {
_zip_buffer_put_16(buffer, _zip_string_length(de->comment));
_zip_buffer_put_16(buffer, (zip_uint16_t)de->disk_number);
_zip_buffer_put_16(buffer, de->int_attrib);
_zip_buffer_put_32(buffer, de->ext_attrib);
if (de->offset < ZIP_UINT32_MAX)
_zip_buffer_put_32(buffer, (zip_uint32_t)de->offset);
else
_zip_buffer_put_32(buffer, ZIP_UINT32_MAX);
}
if (!_zip_buffer_ok(buffer)) {
zip_error_set(&za->error, ZIP_ER_INTERNAL, 0);
_zip_buffer_free(buffer);
_zip_ef_free(ef);
return -1;
}
if (_zip_write(za, buf, _zip_buffer_offset(buffer)) < 0) {
_zip_buffer_free(buffer);
_zip_ef_free(ef);
return -1;
}
_zip_buffer_free(buffer);
if (de->filename) {
if (_zip_string_write(za, de->filename) < 0) {
_zip_ef_free(ef);
return -1;
}
}
if (ef) {
if (_zip_ef_write(za, ef, ZIP_EF_BOTH) < 0) {
_zip_ef_free(ef);
return -1;
}
}
_zip_ef_free(ef);
if (de->extra_fields) {
if (_zip_ef_write(za, de->extra_fields, flags) < 0) {
return -1;
}
}
if ((flags & ZIP_FL_LOCAL) == 0) {
if (de->comment) {
if (_zip_string_write(za, de->comment) < 0) {
return -1;
}
}
}
return is_zip64;