#include "tagspriv.h" #define le16u(d) (uint16_t)((d)[0] | (d)[1]<<8) static const struct {	char *s;	int type;}t[] = {	{"IART", Tartist},	{"ICRD", Tdate},	{"IGNR", Tgenre},	{"INAM", Ttitle},	{"IPRD", Talbum},	{"ITRK", Ttrack},	{"ICMT", Tcomment},	{"????", Tunknown},}; inttagwav(Tagctx *ctx){	uint8_t *d;	int i, n, info, csz, x, sz; 	d = (uint8_t*)ctx->buf; 	sz = 1;	info = 0;	for(i = 0; sz > 0; i++){		if(ctx->read(ctx, d, 4+4+(i?0:4)) != 4+4+(i?0:4))			return -1;		if(i == 0){			if(memcmp(d, "RIFF", 4) != 0 || memcmp(d+8, "WAVE", 4) != 0)				return -1;			sz = leuint(d+4);			if(sz < 4)				return -1;			sz -= 4;			continue;		}else if(memcmp(d, "INFO", 4) == 0){			info = 1;			ctx->seek(ctx, -4, 1);			continue;		} 		if(sz <= 8)			break;		sz -= 4+4;		csz = leuint(d+4);		if(sz < csz || csz < 0)			break;		sz -= csz; 		if(i == 1){			if(memcmp(d, "fmt ", 4) != 0 || csz < 16)				return -1;			if(ctx->read(ctx, d, 16) != 16)				return -1;			csz -= 16;			ctx->channels = le16u(d+2);			ctx->samplerate = leuint(d+4);			x = leuint(d+8);			if(ctx->channels < 1 || ctx->samplerate < 1 || x < 1)				return -1;			ctx->duration = sz*1000 / x;		}else if(memcmp(d, "LIST", 4) == 0){			if(csz < 4)				return -1;			sz = csz - 4;			continue;		}else if(info && csz < ctx->bufsz-5){			for(n = 0; n < nelem(t); n++){				if(memcmp(d, t[n].s, 4) == 0 || t[n].type == Tunknown){					if(ctx->read(ctx, d+5, csz) != csz)						return -1;					d[4] = 0;					d[5+csz] = 0;					txtcb(ctx, t[n].type, t[n].type == Tunknown ? (char*)d : "", d+5);					csz = 0;					break;				}			}			if(n < nelem(t))				continue;		} 		if(ctx->seek(ctx, csz, 1) < 0)			return -1;	} 	/* some software may append an id3v2 tag */	if(i > 0 && ctx->read(ctx, d, 8) == 8 && memcmp(d, "id3 ", 4) == 0)		tagid3v2(ctx); 	return i > 0 ? 0 : -1;}