diff options
Diffstat (limited to 'ext/spc/tag.c')
-rw-r--r-- | ext/spc/tag.c | 353 |
1 files changed, 0 insertions, 353 deletions
diff --git a/ext/spc/tag.c b/ext/spc/tag.c deleted file mode 100644 index 41ce812f..00000000 --- a/ext/spc/tag.c +++ /dev/null @@ -1,353 +0,0 @@ -/* Copyright (C) 2007 Brian Koropoff <bkoropoff at gmail com> - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Library General Public - * License as published by the Free Software Foundation; either - * version 2 of the License, or (at your option) any later version. - * - * This library 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 - * Library General Public License for more details. - * - * You should have received a copy of the GNU Library General Public - * License along with this library; if not, write to the - * Free Software Foundation, Inc., 59 Temple Place - Suite 330, - * Boston, MA 02111-1307, USA. - */ - -#include <glib/gstring.h> -#include <glib/gtypes.h> -#include <glib/gmem.h> -#include <glib/gprintf.h> - -#include <tag.h> -#include <string.h> -#include <stdlib.h> - - -#define EXTENDED_OFFSET 0x10200 -#define EXTENDED_MAGIC ((guint32) ('x' << 0 | 'i' << 8 | 'd' << 16 | '6' << 24)) - -#define TYPE_LENGTH 0x0 -#define TYPE_STRING 0x1 -#define TYPE_INTEGER 0x4 - -#define TAG_TITLE 0x01 -#define TAG_GAME 0x02 -#define TAG_ARTIST 0x03 -#define TAG_DUMPER 0x04 -#define TAG_DUMP_DATE 0x05 -#define TAG_EMULATOR 0x06 -#define TAG_COMMENT 0x07 -#define TAG_ALBUM 0x10 -#define TAG_DISC 0x11 -#define TAG_TRACK 0x12 -#define TAG_PUBLISHER 0x13 -#define TAG_YEAR 0x14 -#define TAG_INTRO 0x30 -#define TAG_LOOP 0x31 -#define TAG_END 0x32 -#define TAG_FADE 0x33 -#define TAG_MUTED 0x34 -#define TAG_COUNT 0x35 -#define TAG_AMP 0x36 - -#define READ_INT8(data, offset) (data[offset]) -#define READ_INT16(data, offset) ((data[offset] << 0) + (data[offset+1] << 8)) -#define READ_INT24(data, offset) ((data[offset] << 0) + (data[offset+1] << 8) + (data[offset+2] << 16)) -#define READ_INT32(data, offset) ((data[offset] << 0) + (data[offset+1] << 8) + (data[offset+2] << 16) + (data[offset+3] << 24)) - -static inline gboolean -spc_tag_is_extended (guchar * data, guint length) -{ - // Extended tags come at the end of the file (at a known offset) - // and start with "xid6" - return (length > EXTENDED_OFFSET + 4 - && READ_INT32 (data, EXTENDED_OFFSET) == EXTENDED_MAGIC); -} - -static inline gboolean -spc_tag_is_text_format (guchar * data, guint length) -{ - // Because the id666 format is brain dead, there's - // no definite way to decide if it is in text - // format. This function implements a set of - // heuristics to make a best-effort guess. - - // If the date field contains separators, it is probably text - if (data[0xA0] == '/' || data[0xA0] == '.') - return TRUE; - // If the first byte of the date field is small (but not 0, - // which could indicate an empty string), it's probably binary - if (data[0x9E] >= 1 && data[0x9E] <= 31) - return FALSE; - - // If all previous tests turned up nothing, assume it's text - return TRUE; -} - -static inline gboolean -spc_tag_is_present (guchar * data, guint length) -{ - return data[0x23] == 26; -} - -static inline GDate * -spc_tag_unpack_date (guint32 packed) -{ - guint dump_year = packed / 10000; - guint dump_month = (packed % 10000) / 100; - guint dump_day = packed % 100; - - if (dump_month == 0) - dump_month = 1; - if (dump_day == 0) - dump_day = 1; - - if (dump_year != 0) - return g_date_new_dmy (dump_day, dump_month, dump_year); - else - return NULL; -} - -void -spc_tag_clear (spc_tag_info * info) -{ - info->title = info->game = info->publisher = info->artist = info->album = - info->comment = info->dumper = NULL; - info->dump_date = NULL; - info->time_seconds = 0; - info->time_fade_milliseconds = 0; - info->time_intro = 0; - info->time_end = 0; - info->time_loop = 0; - info->time_fade = 0; - info->loop_count = 0; - info->muted = 0; - info->disc = 0; - info->amplification = 0; -} - -void -spc_tag_get_info (guchar * data, guint length, spc_tag_info * info) -{ - spc_tag_clear (info); - - if (spc_tag_is_present (data, length)) { - gboolean text_format = spc_tag_is_text_format (data, length); - - info->title = g_new0 (gchar, 0x21); - info->game = g_new0 (gchar, 0x21); - info->artist = g_new0 (gchar, 0x21); - info->dumper = g_new0 (gchar, 0x10); - info->comment = g_new0 (gchar, 0x32); - - strncpy (info->title, (gchar *) & data[0x2E], 32); - strncpy (info->artist, (gchar *) & data[(text_format ? 0xB1 : 0xB0)], 32); - strncpy (info->game, (gchar *) & data[0x4E], 32); - strncpy (info->dumper, (gchar *) & data[0x6E], 16); - strncpy (info->comment, (gchar *) & data[0x7E], 32); - - if (text_format) { - gchar time[4]; - gchar fade[6]; - guint dump_year, dump_month, dump_day; - - strncpy (time, (gchar *) data + 0xA9, 3); - strncpy (fade, (gchar *) data + 0xAC, 5); - - time[3] = fade[5] = 0; - - info->time_seconds = atoi (time); - info->time_fade_milliseconds = atoi (fade); - - dump_year = (guint) atoi ((gchar *) data + 0x9E); - dump_month = (guint) atoi ((gchar *) data + 0x9E + 3); - dump_day = (guint) atoi ((gchar *) data + 0x9E + 3 + 3); - - if (dump_month == 0) - dump_month = 1; - if (dump_day == 0) - dump_day = 1; - if (dump_year != 0) - info->dump_date = g_date_new_dmy (dump_day, dump_month, dump_year); - - info->muted = READ_INT8 (data, 0xD1); - info->emulator = READ_INT8 (data, 0xD2); - } else { - info->time_seconds = READ_INT24 (data, 0xA9); - info->time_fade_milliseconds = READ_INT32 (data, 0xAC); - info->dump_date = spc_tag_unpack_date (READ_INT32 (data, 0x9E)); - info->muted = READ_INT8 (data, 0xD0); - info->emulator = READ_INT8 (data, 0xD1); - } - } - - if (spc_tag_is_extended (data, length)) { - guchar *chunk = data + EXTENDED_OFFSET + 8; - guint32 chunk_size = *((guint32 *) (data + EXTENDED_OFFSET + 4)); - - guchar *subchunk, *subchunk_next; - - for (subchunk = chunk; subchunk < chunk + chunk_size; - subchunk = subchunk_next) { - guint8 tag = READ_INT8 (subchunk, 0); - guint8 type = READ_INT8 (subchunk, 1); - guint16 length = READ_INT16 (subchunk, 2); - guchar *value = subchunk + 4; - - switch (type) { - case TYPE_LENGTH: - { - switch (tag) { - case TAG_TRACK: - info->track = READ_INT8 (subchunk, 2 + 1); - break; - case TAG_YEAR: - info->year = READ_INT16 (subchunk, 2); - break; - case TAG_COUNT: - info->loop_count = READ_INT8 (subchunk, 2); - break; - case TAG_EMULATOR: - info->emulator = READ_INT8 (subchunk, 2); - break; - case TAG_DISC: - info->disc = READ_INT8 (subchunk, 2); - break; - case TAG_MUTED: - info->muted = READ_INT8 (subchunk, 2); - break; - default: - break; - } - - subchunk_next = subchunk + 4; - break; - } - case TYPE_STRING: - { - gchar *dest; - - if (length <= 1) - dest = NULL; - else - switch (tag) { - case TAG_TITLE: - dest = info->title = g_renew (gchar, info->title, length); - break; - case TAG_GAME: - dest = info->game = g_renew (gchar, info->game, length); - break; - case TAG_ARTIST: - dest = info->artist = g_renew (gchar, info->artist, length); - break; - case TAG_ALBUM: - dest = info->album = g_renew (gchar, info->album, length); - break; - case TAG_DUMPER: - dest = info->dumper = g_renew (gchar, info->dumper, length); - break; - case TAG_COMMENT: - dest = info->comment = g_renew (gchar, info->comment, length); - break; - case TAG_PUBLISHER: - dest = info->publisher = - g_renew (gchar, info->publisher, length); - break; - default: - dest = NULL; - break; - } - - if (dest) - strncpy (dest, (gchar *) value, length); - - subchunk_next = value + length; - break; - } - case TYPE_INTEGER: - { - switch (tag) { - case TAG_INTRO: - info->time_intro = READ_INT32 (value, 0); - break; - case TAG_END: - info->time_end = READ_INT32 (value, 0); - break; - case TAG_FADE: - info->time_fade = READ_INT32 (value, 0); - break; - case TAG_LOOP: - info->time_loop = READ_INT32 (value, 0); - break; - case TAG_DUMP_DATE: - info->dump_date = spc_tag_unpack_date (READ_INT32 (value, 0)); - break; - case TAG_AMP: - info->amplification = READ_INT32 (value, 0); - break; - default: - break; - } - subchunk_next = value + length; - break; - } - default: - subchunk_next = value + length; - break; - } - } - } - - if (info->title && !*info->title) { - g_free (info->title); - info->title = NULL; - } - if (info->game && !*info->game) { - g_free (info->game); - info->game = NULL; - } - if (info->artist && !*info->artist) { - g_free (info->artist); - info->artist = NULL; - } - if (info->album && !*info->album) { - g_free (info->album); - info->album = NULL; - } - if (info->publisher && !*info->publisher) { - g_free (info->publisher); - info->publisher = NULL; - } - if (info->comment && !*info->comment) { - g_free (info->comment); - info->comment = NULL; - } - if (info->dumper && !*info->dumper) { - g_free (info->dumper); - info->dumper = NULL; - } -} - -void -spc_tag_free (spc_tag_info * info) -{ - if (info->title) - g_free (info->title); - if (info->game) - g_free (info->game); - if (info->artist) - g_free (info->artist); - if (info->album) - g_free (info->album); - if (info->publisher) - g_free (info->publisher); - if (info->comment) - g_free (info->comment); - if (info->dumper) - g_free (info->dumper); - if (info->dump_date) - g_date_free (info->dump_date); -} |