116 lines
2.8 KiB
C
116 lines
2.8 KiB
C
/*
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* Copyright (C) 2003-2011 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "ape.h"
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#include <glib.h>
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#include <stdint.h>
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#include <assert.h>
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#include <stdio.h>
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#include <string.h>
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struct ape_footer {
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unsigned char id[8];
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uint32_t version;
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uint32_t length;
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uint32_t count;
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unsigned char flags[4];
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unsigned char reserved[8];
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};
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static bool
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ape_scan_internal(FILE *fp, tag_ape_callback_t callback, void *ctx)
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{
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/* determine if file has an apeV2 tag */
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struct ape_footer footer;
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if (fseek(fp, -(long)sizeof(footer), SEEK_END) ||
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fread(&footer, 1, sizeof(footer), fp) != sizeof(footer) ||
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memcmp(footer.id, "APETAGEX", sizeof(footer.id)) != 0 ||
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GUINT32_FROM_LE(footer.version) != 2000)
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return false;
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/* find beginning of ape tag */
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size_t remaining = GUINT32_FROM_LE(footer.length);
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if (remaining <= sizeof(footer) + 10 ||
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/* refuse to load more than one megabyte of tag data */
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remaining > 1024 * 1024 ||
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fseek(fp, -(long)remaining, SEEK_END))
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return false;
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/* read tag into buffer */
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remaining -= sizeof(footer);
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assert(remaining > 10);
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char *buffer = g_malloc(remaining);
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if (fread(buffer, 1, remaining, fp) != remaining) {
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g_free(buffer);
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return false;
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}
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/* read tags */
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unsigned n = GUINT32_FROM_LE(footer.count);
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const char *p = buffer;
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while (n-- && remaining > 10) {
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size_t size = GUINT32_FROM_LE(*(const uint32_t *)p);
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p += 4;
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remaining -= 4;
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unsigned long flags = GUINT32_FROM_LE(*(const uint32_t *)p);
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p += 4;
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remaining -= 4;
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/* get the key */
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const char *key = p;
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while (remaining > size && *p != '\0') {
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p++;
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remaining--;
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}
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p++;
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remaining--;
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/* get the value */
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if (remaining < size)
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break;
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if (!callback(flags, key, p, size, ctx))
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break;
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p += size;
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remaining -= size;
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}
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g_free(buffer);
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return true;
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}
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bool
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tag_ape_scan(const char *path_fs, tag_ape_callback_t callback, void *ctx)
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{
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FILE *fp;
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fp = fopen(path_fs, "rb");
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if (fp == NULL)
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return false;
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bool success = ape_scan_internal(fp, callback, ctx);
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fclose(fp);
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return success;
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}
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