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

 /*
   zip_extra_field_api.c -- public extra fields API functions
   Copyright (C) 2012-2021 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"


 ZIP_EXTERN int
 zip_file_extra_field_delete(zip_t *za, zip_uint64_t idx, zip_uint16_t ef_idx, zip_flags_t flags) {
     zip_dirent_t *de;

     if ((flags & ZIP_EF_BOTH) == 0) {
         zip_error_set(&za->error, ZIP_ER_INVAL, 0);
         return -1;
     }

     if (((flags & ZIP_EF_BOTH) == ZIP_EF_BOTH) && (ef_idx != ZIP_EXTRA_FIELD_ALL)) {
         zip_error_set(&za->error, ZIP_ER_INVAL, 0);
         return -1;
     }

     if (_zip_get_dirent(za, idx, 0, NULL) == NULL)
         return -1;

     if (ZIP_IS_RDONLY(za)) {
         zip_error_set(&za->error, ZIP_ER_RDONLY, 0);
         return -1;
     }

     if (_zip_file_extra_field_prepare_for_change(za, idx) < 0)
         return -1;

     de = za->entry[idx].changes;

     de->extra_fields = _zip_ef_delete_by_id(de->extra_fields, ZIP_EXTRA_FIELD_ALL, ef_idx, flags);
     return 0;
 }


 ZIP_EXTERN int
 zip_file_extra_field_delete_by_id(zip_t *za, zip_uint64_t idx, zip_uint16_t ef_id, zip_uint16_t ef_idx, zip_flags_t flags) {
     zip_dirent_t *de;

     if ((flags & ZIP_EF_BOTH) == 0) {
         zip_error_set(&za->error, ZIP_ER_INVAL, 0);
         return -1;
     }

     if (((flags & ZIP_EF_BOTH) == ZIP_EF_BOTH) && (ef_idx != ZIP_EXTRA_FIELD_ALL)) {
         zip_error_set(&za->error, ZIP_ER_INVAL, 0);
         return -1;
     }

     if (_zip_get_dirent(za, idx, 0, NULL) == NULL)
         return -1;

     if (ZIP_IS_RDONLY(za)) {
         zip_error_set(&za->error, ZIP_ER_RDONLY, 0);
         return -1;
     }

     if (_zip_file_extra_field_prepare_for_change(za, idx) < 0)
         return -1;

     de = za->entry[idx].changes;

     de->extra_fields = _zip_ef_delete_by_id(de->extra_fields, ef_id, ef_idx, flags);
     return 0;
 }


 ZIP_EXTERN const zip_uint8_t *
 zip_file_extra_field_get(zip_t *za, zip_uint64_t idx, zip_uint16_t ef_idx, zip_uint16_t *idp, zip_uint16_t *lenp, zip_flags_t flags) {
     static const zip_uint8_t empty[1] = {'\0'};

     zip_dirent_t *de;
     zip_extra_field_t *ef;
     int i;

     if ((flags & ZIP_EF_BOTH) == 0) {
         zip_error_set(&za->error, ZIP_ER_INVAL, 0);
         return NULL;
     }

     if ((de = _zip_get_dirent(za, idx, flags, &za->error)) == NULL)
         return NULL;

     if (flags & ZIP_FL_LOCAL)
         if (_zip_read_local_ef(za, idx) < 0)
             return NULL;

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

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

     zip_error_set(&za->error, ZIP_ER_NOENT, 0);
     return NULL;
 }


 ZIP_EXTERN const zip_uint8_t *
 zip_file_extra_field_get_by_id(zip_t *za, zip_uint64_t idx, zip_uint16_t ef_id, zip_uint16_t ef_idx, zip_uint16_t *lenp, zip_flags_t flags) {
     zip_dirent_t *de;

     if ((flags & ZIP_EF_BOTH) == 0) {
         zip_error_set(&za->error, ZIP_ER_INVAL, 0);
         return NULL;
     }

     if ((de = _zip_get_dirent(za, idx, flags, &za->error)) == NULL)
         return NULL;

     if (flags & ZIP_FL_LOCAL)
         if (_zip_read_local_ef(za, idx) < 0)
             return NULL;

     return _zip_ef_get_by_id(de->extra_fields, lenp, ef_id, ef_idx, flags, &za->error);
 }


 ZIP_EXTERN zip_int16_t
 zip_file_extra_fields_count(zip_t *za, zip_uint64_t idx, zip_flags_t flags) {
     zip_dirent_t *de;
     zip_extra_field_t *ef;
     zip_uint16_t n;

     if ((flags & ZIP_EF_BOTH) == 0) {
         zip_error_set(&za->error, ZIP_ER_INVAL, 0);
         return -1;
     }

     if ((de = _zip_get_dirent(za, idx, flags, &za->error)) == NULL)
         return -1;

     if (flags & ZIP_FL_LOCAL)
         if (_zip_read_local_ef(za, idx) < 0)
             return -1;

     n = 0;
     for (ef = de->extra_fields; ef; ef = ef->next)
         if (ef->flags & flags & ZIP_EF_BOTH)
             n++;

     return (zip_int16_t)n;
 }


 ZIP_EXTERN zip_int16_t
 zip_file_extra_fields_count_by_id(zip_t *za, zip_uint64_t idx, zip_uint16_t ef_id, zip_flags_t flags) {
     zip_dirent_t *de;
     zip_extra_field_t *ef;
     zip_uint16_t n;

     if ((flags & ZIP_EF_BOTH) == 0) {
         zip_error_set(&za->error, ZIP_ER_INVAL, 0);
         return -1;
     }

     if ((de = _zip_get_dirent(za, idx, flags, &za->error)) == NULL)
         return -1;

     if (flags & ZIP_FL_LOCAL)
         if (_zip_read_local_ef(za, idx) < 0)
             return -1;

     n = 0;
     for (ef = de->extra_fields; ef; ef = ef->next)
         if (ef->id == ef_id && (ef->flags & flags & ZIP_EF_BOTH))
             n++;

     return (zip_int16_t)n;
 }


 ZIP_EXTERN int
 zip_file_extra_field_set(zip_t *za, zip_uint64_t idx, zip_uint16_t ef_id, zip_uint16_t ef_idx, const zip_uint8_t *data, zip_uint16_t len, zip_flags_t flags) {
     zip_dirent_t *de;
     zip_uint16_t ls, cs;
     zip_extra_field_t *ef, *ef_prev, *ef_new;
     int i, found, new_len;

     if ((flags & ZIP_EF_BOTH) == 0) {
         zip_error_set(&za->error, ZIP_ER_INVAL, 0);
         return -1;
     }

     if (_zip_get_dirent(za, idx, 0, NULL) == NULL)
         return -1;

     if (ZIP_IS_RDONLY(za)) {
         zip_error_set(&za->error, ZIP_ER_RDONLY, 0);
         return -1;
     }

     if (ZIP_EF_IS_INTERNAL(ef_id)) {
         zip_error_set(&za->error, ZIP_ER_INVAL, 0);
         return -1;
     }

     if (_zip_file_extra_field_prepare_for_change(za, idx) < 0)
         return -1;

     de = za->entry[idx].changes;

     ef = de->extra_fields;
     ef_prev = NULL;
     i = 0;
     found = 0;

     for (; ef; ef = ef->next) {
         if (ef->id == ef_id && (ef->flags & flags & ZIP_EF_BOTH)) {
             if (i == ef_idx) {
                 found = 1;
                 break;
             }
             i++;
         }
         ef_prev = ef;
     }

     if (i < ef_idx && ef_idx != ZIP_EXTRA_FIELD_NEW) {
         zip_error_set(&za->error, ZIP_ER_INVAL, 0);
         return -1;
     }

     if (flags & ZIP_EF_LOCAL)
         ls = _zip_ef_size(de->extra_fields, ZIP_EF_LOCAL);
     else
         ls = 0;
     if (flags & ZIP_EF_CENTRAL)
         cs = _zip_ef_size(de->extra_fields, ZIP_EF_CENTRAL);
     else
         cs = 0;

     new_len = ls > cs ? ls : cs;
     if (found)
         new_len -= ef->size + 4;
     new_len += len + 4;

     if (new_len > ZIP_UINT16_MAX) {
         zip_error_set(&za->error, ZIP_ER_INVAL, 0);
         return -1;
     }

     if ((ef_new = _zip_ef_new(ef_id, len, data, flags)) == NULL) {
         zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
         return -1;
     }

     if (found) {
         if ((ef->flags & ZIP_EF_BOTH) == (flags & ZIP_EF_BOTH)) {
             ef_new->next = ef->next;
             ef->next = NULL;
             _zip_ef_free(ef);
             if (ef_prev)
                 ef_prev->next = ef_new;
             else
                 de->extra_fields = ef_new;
         }
         else {
             ef->flags &= ~(flags & ZIP_EF_BOTH);
             ef_new->next = ef->next;
             ef->next = ef_new;
         }
     }
     else if (ef_prev) {
         ef_new->next = ef_prev->next;
         ef_prev->next = ef_new;
     }
     else
         de->extra_fields = ef_new;

     return 0;
 }


 int
 _zip_file_extra_field_prepare_for_change(zip_t *za, zip_uint64_t idx) {
     zip_entry_t *e;

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

     e = za->entry + idx;

     if (e->changes && (e->changes->changed & ZIP_DIRENT_EXTRA_FIELD))
         return 0;

     if (e->orig) {
         if (_zip_read_local_ef(za, idx) < 0)
             return -1;
     }

     if (e->changes == NULL) {
         if ((e->changes = _zip_dirent_clone(e->orig)) == NULL) {
             zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
             return -1;
         }
     }

     if (e->orig && e->orig->extra_fields) {
         if ((e->changes->extra_fields = _zip_ef_clone(e->orig->extra_fields, &za->error)) == NULL)
             return -1;
     }
     e->changes->changed |= ZIP_DIRENT_EXTRA_FIELD;

     return 0;
 }
	/*
	zip_extra_field_api.c -- public extra fields API functions
	Copyright (C) 2012-2021 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"


	ZIP_EXTERN int
	zip_file_extra_field_delete(zip_t *za, zip_uint64_t idx, zip_uint16_t ef_idx, zip_flags_t flags) {
	zip_dirent_t *de;

	if ((flags & ZIP_EF_BOTH) == 0) {
	zip_error_set(&za->error, ZIP_ER_INVAL, 0);
	return -1;
	}

	if (((flags & ZIP_EF_BOTH) == ZIP_EF_BOTH) && (ef_idx != ZIP_EXTRA_FIELD_ALL)) {
	zip_error_set(&za->error, ZIP_ER_INVAL, 0);
	return -1;
	}

	if (_zip_get_dirent(za, idx, 0, NULL) == NULL)
	return -1;

	if (ZIP_IS_RDONLY(za)) {
	zip_error_set(&za->error, ZIP_ER_RDONLY, 0);
	return -1;
	}

	if (_zip_file_extra_field_prepare_for_change(za, idx) < 0)
	return -1;

	de = za->entry[idx].changes;

	de->extra_fields = _zip_ef_delete_by_id(de->extra_fields, ZIP_EXTRA_FIELD_ALL, ef_idx, flags);
	return 0;
	}


	ZIP_EXTERN int
	zip_file_extra_field_delete_by_id(zip_t *za, zip_uint64_t idx, zip_uint16_t ef_id, zip_uint16_t ef_idx, zip_flags_t flags) {
	zip_dirent_t *de;

	if ((flags & ZIP_EF_BOTH) == 0) {
	zip_error_set(&za->error, ZIP_ER_INVAL, 0);
	return -1;
	}

	if (((flags & ZIP_EF_BOTH) == ZIP_EF_BOTH) && (ef_idx != ZIP_EXTRA_FIELD_ALL)) {
	zip_error_set(&za->error, ZIP_ER_INVAL, 0);
	return -1;
	}

	if (_zip_get_dirent(za, idx, 0, NULL) == NULL)
	return -1;

	if (ZIP_IS_RDONLY(za)) {
	zip_error_set(&za->error, ZIP_ER_RDONLY, 0);
	return -1;
	}

	if (_zip_file_extra_field_prepare_for_change(za, idx) < 0)
	return -1;

	de = za->entry[idx].changes;

	de->extra_fields = _zip_ef_delete_by_id(de->extra_fields, ef_id, ef_idx, flags);
	return 0;
	}


	ZIP_EXTERN const zip_uint8_t *
	zip_file_extra_field_get(zip_t za, zip_uint64_t idx, zip_uint16_t ef_idx, zip_uint16_t idp, zip_uint16_t *lenp, zip_flags_t flags) {
	static const zip_uint8_t empty[1] = {'\0'};

	zip_dirent_t *de;
	zip_extra_field_t *ef;
	int i;

	if ((flags & ZIP_EF_BOTH) == 0) {
	zip_error_set(&za->error, ZIP_ER_INVAL, 0);
	return NULL;
	}

	if ((de = _zip_get_dirent(za, idx, flags, &za->error)) == NULL)
	return NULL;

	if (flags & ZIP_FL_LOCAL)
	if (_zip_read_local_ef(za, idx) < 0)
	return NULL;

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

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

	zip_error_set(&za->error, ZIP_ER_NOENT, 0);
	return NULL;
	}


	ZIP_EXTERN const zip_uint8_t *
	zip_file_extra_field_get_by_id(zip_t za, zip_uint64_t idx, zip_uint16_t ef_id, zip_uint16_t ef_idx, zip_uint16_t lenp, zip_flags_t flags) {
	zip_dirent_t *de;

	if ((flags & ZIP_EF_BOTH) == 0) {
	zip_error_set(&za->error, ZIP_ER_INVAL, 0);
	return NULL;
	}

	if ((de = _zip_get_dirent(za, idx, flags, &za->error)) == NULL)
	return NULL;

	if (flags & ZIP_FL_LOCAL)
	if (_zip_read_local_ef(za, idx) < 0)
	return NULL;

	return _zip_ef_get_by_id(de->extra_fields, lenp, ef_id, ef_idx, flags, &za->error);
	}


	ZIP_EXTERN zip_int16_t
	zip_file_extra_fields_count(zip_t *za, zip_uint64_t idx, zip_flags_t flags) {
	zip_dirent_t *de;
	zip_extra_field_t *ef;
	zip_uint16_t n;

	if ((flags & ZIP_EF_BOTH) == 0) {
	zip_error_set(&za->error, ZIP_ER_INVAL, 0);
	return -1;
	}

	if ((de = _zip_get_dirent(za, idx, flags, &za->error)) == NULL)
	return -1;

	if (flags & ZIP_FL_LOCAL)
	if (_zip_read_local_ef(za, idx) < 0)
	return -1;

	n = 0;
	for (ef = de->extra_fields; ef; ef = ef->next)
	if (ef->flags & flags & ZIP_EF_BOTH)
	n++;

	return (zip_int16_t)n;
	}


	ZIP_EXTERN zip_int16_t
	zip_file_extra_fields_count_by_id(zip_t *za, zip_uint64_t idx, zip_uint16_t ef_id, zip_flags_t flags) {
	zip_dirent_t *de;
	zip_extra_field_t *ef;
	zip_uint16_t n;

	if ((flags & ZIP_EF_BOTH) == 0) {
	zip_error_set(&za->error, ZIP_ER_INVAL, 0);
	return -1;
	}

	if ((de = _zip_get_dirent(za, idx, flags, &za->error)) == NULL)
	return -1;

	if (flags & ZIP_FL_LOCAL)
	if (_zip_read_local_ef(za, idx) < 0)
	return -1;

	n = 0;
	for (ef = de->extra_fields; ef; ef = ef->next)
	if (ef->id == ef_id && (ef->flags & flags & ZIP_EF_BOTH))
	n++;

	return (zip_int16_t)n;
	}


	ZIP_EXTERN int
	zip_file_extra_field_set(zip_t za, zip_uint64_t idx, zip_uint16_t ef_id, zip_uint16_t ef_idx, const zip_uint8_t data, zip_uint16_t len, zip_flags_t flags) {
	zip_dirent_t *de;
	zip_uint16_t ls, cs;
	zip_extra_field_t ef, ef_prev, *ef_new;
	int i, found, new_len;

	if ((flags & ZIP_EF_BOTH) == 0) {
	zip_error_set(&za->error, ZIP_ER_INVAL, 0);
	return -1;
	}

	if (_zip_get_dirent(za, idx, 0, NULL) == NULL)
	return -1;

	if (ZIP_IS_RDONLY(za)) {
	zip_error_set(&za->error, ZIP_ER_RDONLY, 0);
	return -1;
	}

	if (ZIP_EF_IS_INTERNAL(ef_id)) {
	zip_error_set(&za->error, ZIP_ER_INVAL, 0);
	return -1;
	}

	if (_zip_file_extra_field_prepare_for_change(za, idx) < 0)
	return -1;

	de = za->entry[idx].changes;

	ef = de->extra_fields;
	ef_prev = NULL;
	i = 0;
	found = 0;

	for (; ef; ef = ef->next) {
	if (ef->id == ef_id && (ef->flags & flags & ZIP_EF_BOTH)) {
	if (i == ef_idx) {
	found = 1;
	break;
	}
	i++;
	}
	ef_prev = ef;
	}

	if (i < ef_idx && ef_idx != ZIP_EXTRA_FIELD_NEW) {
	zip_error_set(&za->error, ZIP_ER_INVAL, 0);
	return -1;
	}

	if (flags & ZIP_EF_LOCAL)
	ls = _zip_ef_size(de->extra_fields, ZIP_EF_LOCAL);
	else
	ls = 0;
	if (flags & ZIP_EF_CENTRAL)
	cs = _zip_ef_size(de->extra_fields, ZIP_EF_CENTRAL);
	else
	cs = 0;

	new_len = ls > cs ? ls : cs;
	if (found)
	new_len -= ef->size + 4;
	new_len += len + 4;

	if (new_len > ZIP_UINT16_MAX) {
	zip_error_set(&za->error, ZIP_ER_INVAL, 0);
	return -1;
	}

	if ((ef_new = _zip_ef_new(ef_id, len, data, flags)) == NULL) {
	zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
	return -1;
	}

	if (found) {
	if ((ef->flags & ZIP_EF_BOTH) == (flags & ZIP_EF_BOTH)) {
	ef_new->next = ef->next;
	ef->next = NULL;
	_zip_ef_free(ef);
	if (ef_prev)
	ef_prev->next = ef_new;
	else
	de->extra_fields = ef_new;
	}
	else {
	ef->flags &= ~(flags & ZIP_EF_BOTH);
	ef_new->next = ef->next;
	ef->next = ef_new;
	}
	}
	else if (ef_prev) {
	ef_new->next = ef_prev->next;
	ef_prev->next = ef_new;
	}
	else
	de->extra_fields = ef_new;

	return 0;
	}


	int
	_zip_file_extra_field_prepare_for_change(zip_t *za, zip_uint64_t idx) {
	zip_entry_t *e;

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

	e = za->entry + idx;

	if (e->changes && (e->changes->changed & ZIP_DIRENT_EXTRA_FIELD))
	return 0;

	if (e->orig) {
	if (_zip_read_local_ef(za, idx) < 0)
	return -1;
	}

	if (e->changes == NULL) {
	if ((e->changes = _zip_dirent_clone(e->orig)) == NULL) {
	zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
	return -1;
	}
	}

	if (e->orig && e->orig->extra_fields) {
	if ((e->changes->extra_fields = _zip_ef_clone(e->orig->extra_fields, &za->error)) == NULL)
	return -1;
	}
	e->changes->changed \|= ZIP_DIRENT_EXTRA_FIELD;

	return 0;
	}