#include <limits.h>#include <stdbool.h>#include <stdint.h>#include <stdio.h>#include <stdlib.h>#include <string.h>#include <strings.h>#include "tags.h" #define nil NULL#define UTFmax 4#define nelem(x) (int)(sizeof(x)/sizeof((x)[0])) enum {	Numgenre = 192,}; extern const char *id3genres[Numgenre]; static inline uint32_tbeuint(const void *d_){	const uint8_t *d = d_;	return d[0]<<24 | d[1]<<16 | d[2]<<8 | d[3];} static inline uint32_tleuint(const void *d_){	const uint8_t *d = d_;	return d[3]<<24 | d[2]<<16 | d[1]<<8 | d[0];} /* * Converts (to UTF-8) at most sz bytes of src and writes it to out buffer. * Returns the number of bytes converted. * You need sz*2+1 bytes for out buffer to be completely safe. */int iso88591toutf8(uint8_t *out, int osz, const uint8_t *src, int sz); /* * Converts (to UTF-8) at most sz bytes of src and writes it to out buffer. * Returns the number of bytes converted or < 0 in case of error. * You need sz*4+1 bytes for out buffer to be completely safe. * UTF-16 defaults to big endian if there is no BOM. */int utf16to8(uint8_t *out, int osz, const uint8_t *src, int sz); /* * Same as utf16to8, but CP437 to UTF-8. */int cp437toutf8(uint8_t *o, int osz, const uint8_t *s, int sz); /* * This one is common for both vorbis.c and flac.c * It maps a string k to tag type and executes the callback from ctx. * Returns 1 if callback was called, 0 otherwise. */void cbvorbiscomment(Tagctx *ctx, char *k, char *v); /* * Used to decode base64-encoded picture block. */int debase64(uint8_t *in, int insz, uint8_t *out, int outsz); /* * METADATA_BLOCK_PICTURE reader function. */int cbmbp(Tagctx *ctx, char *v, int ssz, int off, int picsz); void tagscallcb(Tagctx *ctx, int type, Tag *tag); #define txtcb(ctx, type, k_, v_) \	tagscallcb(ctx, type, &(Tag){.text = {.k = (k_), .v = (char*)(v_)}}) int tagflac(Tagctx *ctx);int tagid3v1(Tagctx *ctx);int tagid3v2(Tagctx *ctx);int tagit(Tagctx *ctx);int tagm4a(Tagctx *ctx);int tagopus(Tagctx *ctx);int tags3m(Tagctx *ctx);int tagvorbis(Tagctx *ctx);int tagwav(Tagctx *ctx);int tagxm(Tagctx *ctx);int tagmod(Tagctx *ctx);