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-rw-r--r--src/libid3tag/file.c674
1 files changed, 0 insertions, 674 deletions
diff --git a/src/libid3tag/file.c b/src/libid3tag/file.c
index 9d7319a7..e69de29b 100644
--- a/src/libid3tag/file.c
+++ b/src/libid3tag/file.c
@@ -1,674 +0,0 @@
-/*
- * libid3tag - ID3 tag manipulation library
- * Copyright (C) 2000-2004 Underbit Technologies, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- * $Id: file.c,v 1.21 2004/01/23 09:41:32 rob Exp $
- */
-
-# ifdef HAVE_CONFIG_H
-# include "config.h"
-# endif
-
-# include "global.h"
-
-# include <stdio.h>
-# include <stdlib.h>
-# include <string.h>
-
-# ifdef HAVE_UNISTD_H
-# include <unistd.h>
-# endif
-
-# ifdef HAVE_ASSERT_H
-# include <assert.h>
-# endif
-
-# include "id3tag.h"
-# include "file.h"
-# include "tag.h"
-# include "field.h"
-
-struct filetag {
- struct id3_tag *tag;
- unsigned long location;
- id3_length_t length;
-};
-
-struct id3_file {
- FILE *iofile;
- enum id3_file_mode mode;
- char *path;
-
- int flags;
-
- struct id3_tag *primary;
-
- unsigned int ntags;
- struct filetag *tags;
-};
-
-enum {
- ID3_FILE_FLAG_ID3V1 = 0x0001
-};
-
-/*
- * NAME: query_tag()
- * DESCRIPTION: check for a tag at a file's current position
- */
-static
-signed long query_tag(FILE *iofile)
-{
- fpos_t save_position;
- id3_byte_t query[ID3_TAG_QUERYSIZE];
- signed long size;
-
- if (fgetpos(iofile, &save_position) == -1)
- return 0;
-
- size = id3_tag_query(query, fread(query, 1, sizeof(query), iofile));
-
- if (fsetpos(iofile, &save_position) == -1)
- return 0;
-
- return size;
-}
-
-/*
- * NAME: read_tag()
- * DESCRIPTION: read and parse a tag at a file's current position
- */
-static
-struct id3_tag *read_tag(FILE *iofile, id3_length_t size)
-{
- id3_byte_t *data;
- struct id3_tag *tag = 0;
-
- data = malloc(size);
- if (data) {
- if (fread(data, size, 1, iofile) == 1)
- tag = id3_tag_parse(data, size);
-
- free(data);
- }
-
- return tag;
-}
-
-/*
- * NAME: update_primary()
- * DESCRIPTION: update the primary tag with data from a new tag
- */
-static
-int update_primary(struct id3_tag *tag, struct id3_tag const *new)
-{
- unsigned int i;
- struct id3_frame *frame;
-
- if (new) {
- if (!(new->extendedflags & ID3_TAG_EXTENDEDFLAG_TAGISANUPDATE))
- id3_tag_clearframes(tag);
-
- i = 0;
- while ((frame = id3_tag_findframe(new, 0, i++))) {
- if (id3_tag_attachframe(tag, frame) == -1)
- return -1;
- }
- }
-
- return 0;
-}
-
-/*
- * NAME: tag_compare()
- * DESCRIPTION: tag sort function for qsort()
- */
-static
-int tag_compare(const void *a, const void *b)
-{
- struct filetag const *tag1 = a, *tag2 = b;
-
- if (tag1->location < tag2->location)
- return -1;
- else if (tag1->location > tag2->location)
- return +1;
-
- return 0;
-}
-
-/*
- * NAME: add_filetag()
- * DESCRIPTION: add a new file tag entry
- */
-static
-int add_filetag(struct id3_file *file, struct filetag const *filetag)
-{
- struct filetag *tags;
-
- tags = realloc(file->tags, (file->ntags + 1) * sizeof(*tags));
- if (tags == 0)
- return -1;
-
- file->tags = tags;
- file->tags[file->ntags++] = *filetag;
-
- /* sort tags by location */
-
- if (file->ntags > 1)
- qsort(file->tags, file->ntags, sizeof(file->tags[0]), tag_compare);
-
- return 0;
-}
-
-/*
- * NAME: del_filetag()
- * DESCRIPTION: delete a file tag entry
- */
-static
-void del_filetag(struct id3_file *file, unsigned int index)
-{
- assert(index < file->ntags);
-
- while (index < file->ntags - 1) {
- file->tags[index] = file->tags[index + 1];
- ++index;
- }
-
- --file->ntags;
-}
-
-/*
- * NAME: add_tag()
- * DESCRIPTION: read, parse, and add a tag to a file structure
- */
-static
-struct id3_tag *add_tag(struct id3_file *file, id3_length_t length)
-{
- long location;
- unsigned int i;
- struct filetag filetag;
- struct id3_tag *tag;
-
- location = ftell(file->iofile);
- if (location == -1)
- return 0;
-
- /* check for duplication/overlap */
- {
- unsigned long begin1, end1, begin2, end2;
-
- begin1 = location;
- end1 = begin1 + length;
-
- for (i = 0; i < file->ntags; ++i) {
- begin2 = file->tags[i].location;
- end2 = begin2 + file->tags[i].length;
-
- if (begin1 == begin2 && end1 == end2)
- return file->tags[i].tag; /* duplicate */
-
- if (begin1 < end2 && end1 > begin2)
- return 0; /* overlap */
- }
- }
-
- tag = read_tag(file->iofile, length);
-
- filetag.tag = tag;
- filetag.location = location;
- filetag.length = length;
-
- if (add_filetag(file, &filetag) == -1 ||
- update_primary(file->primary, tag) == -1) {
- if (tag)
- id3_tag_delete(tag);
- return 0;
- }
-
- if (tag)
- id3_tag_addref(tag);
-
- return tag;
-}
-
-/*
- * NAME: search_tags()
- * DESCRIPTION: search for tags in a file
- */
-static
-int search_tags(struct id3_file *file)
-{
- fpos_t save_position;
- signed long size;
-
- /*
- * save the current seek position
- *
- * We also verify the stream is seekable by calling fsetpos(), since
- * fgetpos() alone is not reliable enough for this purpose.
- *
- * [Apparently not even fsetpos() is sufficient under Win32.]
- */
-
- if (fgetpos(file->iofile, &save_position) == -1 ||
- fsetpos(file->iofile, &save_position) == -1)
- return -1;
-
- /* look for an ID3v1 tag */
-
- if (fseek(file->iofile, -128, SEEK_END) == 0) {
- size = query_tag(file->iofile);
- if (size > 0) {
- struct id3_tag const *tag;
-
- tag = add_tag(file, size);
-
- /* if this is indeed an ID3v1 tag, mark the file so */
-
- if (tag && (ID3_TAG_VERSION_MAJOR(id3_tag_version(tag)) == 1))
- file->flags |= ID3_FILE_FLAG_ID3V1;
- }
- }
-
- /* look for a tag at the beginning of the file */
-
- rewind(file->iofile);
-
- size = query_tag(file->iofile);
- if (size > 0) {
- struct id3_tag const *tag;
- struct id3_frame const *frame;
-
- tag = add_tag(file, size);
-
- /* locate tags indicated by SEEK frames */
-
- while (tag && (frame = id3_tag_findframe(tag, "SEEK", 0))) {
- long seek;
-
- seek = id3_field_getint(id3_frame_field(frame, 0));
- if (seek < 0 || fseek(file->iofile, seek, SEEK_CUR) == -1)
- break;
-
- size = query_tag(file->iofile);
- tag = (size > 0) ? add_tag(file, size) : 0;
- }
- }
-
- /* look for a tag at the end of the file (before any ID3v1 tag) */
-
- if (fseek(file->iofile, ((file->flags & ID3_FILE_FLAG_ID3V1) ? -128 : 0) +
- -10, SEEK_END) == 0) {
- size = query_tag(file->iofile);
- if (size < 0 && fseek(file->iofile, size, SEEK_CUR) == 0) {
- size = query_tag(file->iofile);
- if (size > 0)
- add_tag(file, size);
- }
- }
-
- clearerr(file->iofile);
-
- /* restore seek position */
-
- if (fsetpos(file->iofile, &save_position) == -1)
- return -1;
-
- /* set primary tag options and target padded length for convenience */
-
- if ((file->ntags > 0 && !(file->flags & ID3_FILE_FLAG_ID3V1)) ||
- (file->ntags > 1 && (file->flags & ID3_FILE_FLAG_ID3V1))) {
- if (file->tags[0].location == 0)
- id3_tag_setlength(file->primary, file->tags[0].length);
- else
- id3_tag_options(file->primary, ID3_TAG_OPTION_APPENDEDTAG, ~0);
- }
-
- return 0;
-}
-
-/*
- * NAME: finish_file()
- * DESCRIPTION: release memory associated with a file
- */
-static
-void finish_file(struct id3_file *file)
-{
- unsigned int i;
-
- if (file->path)
- free(file->path);
-
- if (file->primary) {
- id3_tag_delref(file->primary);
- id3_tag_delete(file->primary);
- }
-
- for (i = 0; i < file->ntags; ++i) {
- struct id3_tag *tag;
-
- tag = file->tags[i].tag;
- if (tag) {
- id3_tag_delref(tag);
- id3_tag_delete(tag);
- }
- }
-
- if (file->tags)
- free(file->tags);
-
- free(file);
-}
-
-/*
- * NAME: new_file()
- * DESCRIPTION: create a new file structure and load tags
- */
-static
-struct id3_file *new_file(FILE *iofile, enum id3_file_mode mode,
- char const *path)
-{
- struct id3_file *file;
-
- file = malloc(sizeof(*file));
- if (file == 0)
- goto fail;
-
- file->iofile = iofile;
- file->mode = mode;
- file->path = path ? strdup(path) : 0;
-
- file->flags = 0;
-
- file->ntags = 0;
- file->tags = 0;
-
- file->primary = id3_tag_new();
- if (file->primary == 0)
- goto fail;
-
- id3_tag_addref(file->primary);
-
- /* load tags from the file */
-
- if (search_tags(file) == -1)
- goto fail;
-
- id3_tag_options(file->primary, ID3_TAG_OPTION_ID3V1,
- (file->flags & ID3_FILE_FLAG_ID3V1) ? ~0 : 0);
-
- if (0) {
- fail:
- if (file) {
- finish_file(file);
- file = 0;
- }
- }
-
- return file;
-}
-
-/*
- * NAME: file->open()
- * DESCRIPTION: open a file given its pathname
- */
-struct id3_file *id3_file_open(char const *path, enum id3_file_mode mode)
-{
- FILE *iofile;
- struct id3_file *file;
-
- assert(path);
-
- iofile = fopen(path, (mode == ID3_FILE_MODE_READWRITE) ? "r+b" : "rb");
- if (iofile == 0)
- return 0;
-
- file = new_file(iofile, mode, path);
- if (file == 0)
- fclose(iofile);
-
- return file;
-}
-
-/*
- * NAME: file->fdopen()
- * DESCRIPTION: open a file using an existing file descriptor
- */
-struct id3_file *id3_file_fdopen(int fd, enum id3_file_mode mode)
-{
-# if 1 || defined(HAVE_UNISTD_H)
- FILE *iofile;
- struct id3_file *file;
-
- iofile = fdopen(fd, (mode == ID3_FILE_MODE_READWRITE) ? "r+b" : "rb");
- if (iofile == 0)
- return 0;
-
- file = new_file(iofile, mode, 0);
- if (file == 0) {
- int save_fd;
-
- /* close iofile without closing fd */
-
- save_fd = dup(fd);
-
- fclose(iofile);
-
- dup2(save_fd, fd);
- close(save_fd);
- }
-
- return file;
-# else
- return 0;
-# endif
-}
-
-/*
- * NAME: file->close()
- * DESCRIPTION: close a file and delete its associated tags
- */
-int id3_file_close(struct id3_file *file)
-{
- int result = 0;
-
- assert(file);
-
- if (fclose(file->iofile) == EOF)
- result = -1;
-
- finish_file(file);
-
- return result;
-}
-
-/*
- * NAME: file->tag()
- * DESCRIPTION: return the primary tag structure for a file
- */
-struct id3_tag *id3_file_tag(struct id3_file const *file)
-{
- assert(file);
-
- return file->primary;
-}
-
-/*
- * NAME: v1_write()
- * DESCRIPTION: write ID3v1 tag modifications to a file
- */
-static
-int v1_write(struct id3_file *file,
- id3_byte_t const *data, id3_length_t length)
-{
- assert(!data || length == 128);
-
- if (data) {
- long location;
-
- if (fseek(file->iofile, (file->flags & ID3_FILE_FLAG_ID3V1) ? -128 : 0,
- SEEK_END) == -1 ||
- (location = ftell(file->iofile)) == -1 ||
- fwrite(data, 128, 1, file->iofile) != 1 ||
- fflush(file->iofile) == EOF)
- return -1;
-
- /* add file tag reference */
-
- if (!(file->flags & ID3_FILE_FLAG_ID3V1)) {
- struct filetag filetag;
-
- filetag.tag = 0;
- filetag.location = location;
- filetag.length = 128;
-
- if (add_filetag(file, &filetag) == -1)
- return -1;
-
- file->flags |= ID3_FILE_FLAG_ID3V1;
- }
- }
-# if defined(HAVE_FTRUNCATE)
- else if (file->flags & ID3_FILE_FLAG_ID3V1) {
- long length;
-
- if (fseek(file->iofile, 0, SEEK_END) == -1)
- return -1;
-
- length = ftell(file->iofile);
- if (length == -1 ||
- (length >= 0 && length < 128))
- return -1;
-
- if (ftruncate(fileno(file->iofile), length - 128) == -1)
- return -1;
-
- /* delete file tag reference */
-
- del_filetag(file, file->ntags - 1);
-
- file->flags &= ~ID3_FILE_FLAG_ID3V1;
- }
-# endif
-
- return 0;
-}
-
-/*
- * NAME: v2_write()
- * DESCRIPTION: write ID3v2 tag modifications to a file
- */
-static
-int v2_write(struct id3_file *file,
- id3_byte_t const *data, id3_length_t length)
-{
- assert(!data || length > 0);
-
- if (data &&
- ((file->ntags == 1 && !(file->flags & ID3_FILE_FLAG_ID3V1)) ||
- (file->ntags == 2 && (file->flags & ID3_FILE_FLAG_ID3V1))) &&
- file->tags[0].length == length) {
- /* easy special case: rewrite existing tag in-place */
-
- if (fseek(file->iofile, file->tags[0].location, SEEK_SET) == -1 ||
- fwrite(data, length, 1, file->iofile) != 1 ||
- fflush(file->iofile) == EOF)
- return -1;
-
- goto done;
- }
-
- /* hard general case: rewrite entire file */
-
- /* ... */
-
- done:
- return 0;
-}
-
-/*
- * NAME: file->update()
- * DESCRIPTION: rewrite tag(s) to a file
- */
-int id3_file_update(struct id3_file *file)
-{
- int options, result = 0;
- id3_length_t v1size = 0, v2size = 0;
- id3_byte_t id3v1_data[128], *id3v1 = 0, *id3v2 = 0;
-
- assert(file);
-
- if (file->mode != ID3_FILE_MODE_READWRITE)
- return -1;
-
- options = id3_tag_options(file->primary, 0, 0);
-
- /* render ID3v1 */
-
- if (options & ID3_TAG_OPTION_ID3V1) {
- v1size = id3_tag_render(file->primary, 0);
- if (v1size) {
- assert(v1size == sizeof(id3v1_data));
-
- v1size = id3_tag_render(file->primary, id3v1_data);
- if (v1size) {
- assert(v1size == sizeof(id3v1_data));
- id3v1 = id3v1_data;
- }
- }
- }
-
- /* render ID3v2 */
-
- id3_tag_options(file->primary, ID3_TAG_OPTION_ID3V1, 0);
-
- v2size = id3_tag_render(file->primary, 0);
- if (v2size) {
- id3v2 = malloc(v2size);
- if (id3v2 == 0)
- goto fail;
-
- v2size = id3_tag_render(file->primary, id3v2);
- if (v2size == 0) {
- free(id3v2);
- id3v2 = 0;
- }
- }
-
- /* write tags */
-
- if (v2_write(file, id3v2, v2size) == -1 ||
- v1_write(file, id3v1, v1size) == -1)
- goto fail;
-
- rewind(file->iofile);
-
- /* update file tags array? ... */
-
- if (0) {
- fail:
- result = -1;
- }
-
- /* clean up; restore tag options */
-
- if (id3v2)
- free(id3v2);
-
- id3_tag_options(file->primary, ~0, options);
-
- return result;
-}
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-08 17:16:58 +0000