lib/zip_extra_field.c - third_party/libzip - Git at Google

 /*
   zip_extra_field.c -- manipulate extra fields
   Copyright (C) 2012 Dieter Baron and Thomas Klausner

   This file is part of libzip, a library to manipulate ZIP archives.
   The authors can be contacted at <libzip@nih.at>

   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 "zipint.h"

 #include <errno.h>
 #include <stdlib.h>
 #include <string.h>


 struct zip_extra_field *
 _zip_ef_delete_by_id(struct zip_extra_field *ef, zip_uint16_t id, zip_uint16_t id_idx, zip_flags_t flags)
 {
     struct zip_extra_field *head, *prev;
     int i;

     i = 0;
     head = ef;
     prev = NULL;
     for (; ef; ef=(prev ? prev->next : head)) {
 	if ((ef->flags & flags & ZIP_EF_BOTH) && ef->id == id) {
 	    if (id_idx == ZIP_EXTRA_FIELD_ALL || i == id_idx) {
 		ef->flags &= ~(flags & ZIP_EF_BOTH);
 		if ((ef->flags & ZIP_EF_BOTH) == 0) {
 		    if (prev)
 			prev->next = ef->next;
 		    else
 			head = ef->next;
 		    ef->next = NULL;
 		    _zip_ef_free(ef);

 		    if (id_idx == ZIP_EXTRA_FIELD_ALL)
 			continue;
 		}
 	    }

 	    i++;
 	    if (i > id_idx)
 		break;
 	}
 	prev = ef;
     }

     return head;
 }


 void
 _zip_ef_free(struct zip_extra_field *ef)
 {
     struct zip_extra_field *ef2;

     while (ef) {
 	ef2 = ef->next;
 	free(ef->data);
 	free(ef);
 	ef = ef2;
     }
 }


 const zip_uint8_t *
 _zip_ef_get_by_id(struct zip_extra_field *ef, zip_uint16_t *lenp, zip_uint16_t id, zip_uint16_t id_idx, zip_flags_t flags, struct zip_error *error)
 {
     static const zip_uint8_t empty[1];

     int i;

     i = 0;
     for (; ef; ef=ef->next) {
 	if (ef->id == id && (ef->flags & flags & ZIP_EF_BOTH)) {
 	    if (i < id_idx) {
 		i++;
 		continue;
 	    }

 	    if (lenp)
 		*lenp = ef->size;
 	    if (ef->size > 0)
 		return ef->data;
 	    else
 		return empty;
 	}
     }

     _zip_error_set(error, ZIP_ER_NOENT, 0);
     return NULL;
 }


 struct zip_extra_field *
 _zip_ef_merge(struct zip_extra_field *to, struct zip_extra_field *from)
 {
     struct zip_extra_field *ef2, *tt, *tail;
     int duplicate;

     if (to == NULL)
 	return from;

     for (tail=to; tail->next; tail=tail->next)
 	;

     for (; from; from=ef2) {
 	ef2 = from->next;

 	duplicate = 0;
 	for (tt=to; tt; tt=tt->next) {
 	    if (tt->id == from->id && tt->size == from->size && memcmp(tt->data, from->data, tt->size) == 0) {
 		tt->flags |= (from->flags & ZIP_EF_BOTH);
 		duplicate = 1;
 		break;
 	    }
 	}

 	from->next = NULL;
 	if (duplicate)
 	    _zip_ef_free(from);
 	else
 	    tail = tail->next = from;
     }

     return to;
 }


 struct zip_extra_field *
 _zip_ef_new(zip_uint16_t id, zip_uint16_t size, const zip_uint8_t *data, zip_flags_t flags)
 {
     struct zip_extra_field *ef;

     if ((ef=malloc(sizeof(*ef))) == NULL)
 	return NULL;

     ef->next = NULL;
     ef->flags = flags;
     ef->id = id;
     ef->size = size;
     if (size > 0) {
 	if ((ef->data=_zip_memdup(data, size, NULL)) == NULL) {
 	    free(ef);
 	    return NULL;
 	}
     }
     else
 	ef->data = NULL;

     return ef;
 }


 struct zip_extra_field *
 _zip_ef_parse(const zip_uint8_t *data, zip_uint16_t len, zip_flags_t flags, struct zip_error *error)
 {
     struct zip_extra_field *ef, *ef2, *ef_head;
     int i;
     const zip_uint8_t *p;
     zip_uint16_t fid, flen;

     ef_head = NULL;
     i = 0;
     for (p=data; p<data+len; p+=flen+4) {
 	if (p+4 > data+len) {
 	    _zip_error_set(error, ZIP_ER_INCONS, 0);
 	    _zip_ef_free(ef_head);
 	    return NULL;
 	}

 	fid = p[0]+(p[1]<<8);
 	flen = p[2]+(p[3]<<8);

 	if (p+flen+4 > data+len) {
 	    _zip_error_set(error, ZIP_ER_INCONS, 0);
 	    _zip_ef_free(ef_head);
 	    return NULL;
 	}

 	if ((ef2=_zip_ef_new(fid, flen, p+4, flags)) == NULL) {
 	    _zip_error_set(error, ZIP_ER_MEMORY, 0);
 	    _zip_ef_free(ef_head);
 	    return NULL;
 	}

 	if (ef_head) {
 	    ef->next = ef2;
 	    ef = ef2;
 	}
 	else
 	    ef_head = ef = ef2;
     }

     return ef_head;
 }


 zip_uint16_t
 _zip_ef_size(struct zip_extra_field *ef, zip_flags_t flags)
 {
     zip_uint16_t size;

     size = 0;
     for (; ef; ef=ef->next) {
 	if (ef->flags & flags & ZIP_EF_BOTH)
 	    size += 4+ef->size;
     }

     return size;
 }


 void
 _zip_ef_write(struct zip_extra_field *ef, zip_flags_t flags, FILE *f)
 {
     for (; ef; ef=ef->next) {
 	if (ef->flags & flags & ZIP_EF_BOTH) {
 	    _zip_write2(ef->id, f);
 	    _zip_write2(ef->size, f);
 	    if (ef->size > 0)
 		fwrite(ef->data, ef->size, 1, f);
 	}
     }
 }


 int
 _zip_read_local_ef(struct zip *za, int idx)
 {
     struct zip_entry *e;
     unsigned char b[4];
     const unsigned char *p;
     zip_uint16_t fname_len, ef_len;
     zip_uint8_t *ef_raw;
     struct zip_extra_field *ef;

     if (idx >= za->nentry) {
 	_zip_error_set(&za->error, ZIP_ER_INVAL, 0);
 	return -1;
     }

     e = za->entry+idx;

     if (e->orig == NULL || e->orig->local_extra_fields_read)
 	return 0;


     if (fseek(za->zp, e->orig->offset + 26, SEEK_SET) < 0) {
 	_zip_error_set(&za->error, ZIP_ER_SEEK, errno);
 	return -1;
     }

     if (fread(b, sizeof(b), 1, za->zp) != 1) {
 	_zip_error_set(&za->error, ZIP_ER_READ, errno);
 	return -1;
     }

     p = b;
     fname_len = _zip_read2(&p);
     ef_len = _zip_read2(&p);

     if (ef_len > 0) {
 	if (fseek(za->zp, fname_len, SEEK_CUR) < 0) {
 	    _zip_error_set(&za->error, ZIP_ER_SEEK, errno);
 	    return -1;
 	}

 	ef_raw = _zip_read_data(NULL, za->zp, ef_len, 0, &za->error);

 	if (ef_raw == NULL)
 	    return -1;

 	if ((ef=_zip_ef_parse(ef_raw, ef_len, ZIP_EF_LOCAL, &za->error)) == NULL) {
 	    free(ef_raw);
 	    return -1;
 	}
 	free(ef_raw);

 	e->orig->extra_fields = _zip_ef_merge(e->orig->extra_fields, ef);
     }

     e->orig->local_extra_fields_read = 1;

     if (e->changes && e->changes->local_extra_fields_read == 0) {
 	e->changes->extra_fields = e->orig->extra_fields;
 	e->changes->local_extra_fields_read = 1;
     }

     return 0;
 }
	/*
	zip_extra_field.c -- manipulate extra fields
	Copyright (C) 2012 Dieter Baron and Thomas Klausner

	This file is part of libzip, a library to manipulate ZIP archives.
	The authors can be contacted at <libzip@nih.at>

	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 "zipint.h"

	#include <errno.h>
	#include <stdlib.h>
	#include <string.h>



	struct zip_extra_field *
	_zip_ef_delete_by_id(struct zip_extra_field *ef, zip_uint16_t id, zip_uint16_t id_idx, zip_flags_t flags)
	{
	struct zip_extra_field head, prev;
	int i;

	i = 0;
	head = ef;
	prev = NULL;
	for (; ef; ef=(prev ? prev->next : head)) {
	if ((ef->flags & flags & ZIP_EF_BOTH) && ef->id == id) {
	if (id_idx == ZIP_EXTRA_FIELD_ALL \|\| i == id_idx) {
	ef->flags &= ~(flags & ZIP_EF_BOTH);
	if ((ef->flags & ZIP_EF_BOTH) == 0) {
	if (prev)
	prev->next = ef->next;
	else
	head = ef->next;
	ef->next = NULL;
	_zip_ef_free(ef);

	if (id_idx == ZIP_EXTRA_FIELD_ALL)
	continue;
	}
	}

	i++;
	if (i > id_idx)
	break;
	}
	prev = ef;
	}

	return head;
	}




	void
	_zip_ef_free(struct zip_extra_field *ef)
	{
	struct zip_extra_field *ef2;

	while (ef) {
	ef2 = ef->next;
	free(ef->data);
	free(ef);
	ef = ef2;
	}
	}



	const zip_uint8_t *
	_zip_ef_get_by_id(struct zip_extra_field ef, zip_uint16_t lenp, zip_uint16_t id, zip_uint16_t id_idx, zip_flags_t flags, struct zip_error *error)
	{
	static const zip_uint8_t empty[1];

	int i;

	i = 0;
	for (; ef; ef=ef->next) {
	if (ef->id == id && (ef->flags & flags & ZIP_EF_BOTH)) {
	if (i < id_idx) {
	i++;
	continue;
	}

	if (lenp)
	*lenp = ef->size;
	if (ef->size > 0)
	return ef->data;
	else
	return empty;
	}
	}

	_zip_error_set(error, ZIP_ER_NOENT, 0);
	return NULL;
	}



	struct zip_extra_field *
	_zip_ef_merge(struct zip_extra_field to, struct zip_extra_field from)
	{
	struct zip_extra_field ef2, tt, *tail;
	int duplicate;

	if (to == NULL)
	return from;

	for (tail=to; tail->next; tail=tail->next)
	;

	for (; from; from=ef2) {
	ef2 = from->next;

	duplicate = 0;
	for (tt=to; tt; tt=tt->next) {
	if (tt->id == from->id && tt->size == from->size && memcmp(tt->data, from->data, tt->size) == 0) {
	tt->flags \|= (from->flags & ZIP_EF_BOTH);
	duplicate = 1;
	break;
	}
	}

	from->next = NULL;
	if (duplicate)
	_zip_ef_free(from);
	else
	tail = tail->next = from;
	}

	return to;
	}



	struct zip_extra_field *
	_zip_ef_new(zip_uint16_t id, zip_uint16_t size, const zip_uint8_t *data, zip_flags_t flags)
	{
	struct zip_extra_field *ef;

	if ((ef=malloc(sizeof(*ef))) == NULL)
	return NULL;

	ef->next = NULL;
	ef->flags = flags;
	ef->id = id;
	ef->size = size;
	if (size > 0) {
	if ((ef->data=_zip_memdup(data, size, NULL)) == NULL) {
	free(ef);
	return NULL;
	}
	}
	else
	ef->data = NULL;

	return ef;
	}



	struct zip_extra_field *
	_zip_ef_parse(const zip_uint8_t data, zip_uint16_t len, zip_flags_t flags, struct zip_error error)
	{
	struct zip_extra_field ef, ef2, *ef_head;
	int i;
	const zip_uint8_t *p;
	zip_uint16_t fid, flen;

	ef_head = NULL;
	i = 0;
	for (p=data; p<data+len; p+=flen+4) {
	if (p+4 > data+len) {
	_zip_error_set(error, ZIP_ER_INCONS, 0);
	_zip_ef_free(ef_head);
	return NULL;
	}

	fid = p[0]+(p[1]<<8);
	flen = p[2]+(p[3]<<8);

	if (p+flen+4 > data+len) {
	_zip_error_set(error, ZIP_ER_INCONS, 0);
	_zip_ef_free(ef_head);
	return NULL;
	}

	if ((ef2=_zip_ef_new(fid, flen, p+4, flags)) == NULL) {
	_zip_error_set(error, ZIP_ER_MEMORY, 0);
	_zip_ef_free(ef_head);
	return NULL;
	}

	if (ef_head) {
	ef->next = ef2;
	ef = ef2;
	}
	else
	ef_head = ef = ef2;
	}

	return ef_head;
	}



	zip_uint16_t
	_zip_ef_size(struct zip_extra_field *ef, zip_flags_t flags)
	{
	zip_uint16_t size;

	size = 0;
	for (; ef; ef=ef->next) {
	if (ef->flags & flags & ZIP_EF_BOTH)
	size += 4+ef->size;
	}

	return size;
	}



	void
	_zip_ef_write(struct zip_extra_field ef, zip_flags_t flags, FILE f)
	{
	for (; ef; ef=ef->next) {
	if (ef->flags & flags & ZIP_EF_BOTH) {
	_zip_write2(ef->id, f);
	_zip_write2(ef->size, f);
	if (ef->size > 0)
	fwrite(ef->data, ef->size, 1, f);
	}
	}
	}



	int
	_zip_read_local_ef(struct zip *za, int idx)
	{
	struct zip_entry *e;
	unsigned char b[4];
	const unsigned char *p;
	zip_uint16_t fname_len, ef_len;
	zip_uint8_t *ef_raw;
	struct zip_extra_field *ef;

	if (idx >= za->nentry) {
	_zip_error_set(&za->error, ZIP_ER_INVAL, 0);
	return -1;
	}

	e = za->entry+idx;

	if (e->orig == NULL \|\| e->orig->local_extra_fields_read)
	return 0;


	if (fseek(za->zp, e->orig->offset + 26, SEEK_SET) < 0) {
	_zip_error_set(&za->error, ZIP_ER_SEEK, errno);
	return -1;
	}

	if (fread(b, sizeof(b), 1, za->zp) != 1) {
	_zip_error_set(&za->error, ZIP_ER_READ, errno);
	return -1;
	}

	p = b;
	fname_len = _zip_read2(&p);
	ef_len = _zip_read2(&p);

	if (ef_len > 0) {
	if (fseek(za->zp, fname_len, SEEK_CUR) < 0) {
	_zip_error_set(&za->error, ZIP_ER_SEEK, errno);
	return -1;
	}

	ef_raw = _zip_read_data(NULL, za->zp, ef_len, 0, &za->error);

	if (ef_raw == NULL)
	return -1;

	if ((ef=_zip_ef_parse(ef_raw, ef_len, ZIP_EF_LOCAL, &za->error)) == NULL) {
	free(ef_raw);
	return -1;
	}
	free(ef_raw);

	e->orig->extra_fields = _zip_ef_merge(e->orig->extra_fields, ef);
	}

	e->orig->local_extra_fields_read = 1;

	if (e->changes && e->changes->local_extra_fields_read == 0) {
	e->changes->extra_fields = e->orig->extra_fields;
	e->changes->local_extra_fields_read = 1;
	}

	return 0;
	}