101 lines
1.9 KiB
C
101 lines
1.9 KiB
C
#include "mauplay.h"
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static unsigned int syncsafe(FILE* f) {
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unsigned char d[4];
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unsigned int r = 0;
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int i;
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fread(d, 4, 1, f);
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for(i = 0; i < 4; i++) {
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r = r << 7;
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r = r | (d[i] & 127);
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}
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return r;
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}
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static unsigned int big(FILE* f) {
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unsigned char d[4];
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unsigned int r = 0;
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int i;
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fread(d, 4, 1, f);
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for(i = 0; i < 4; i++) {
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r = r << 8;
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r = r | d[i];
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}
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return r;
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}
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unsigned char* id3_findimage(const char* path, size_t* size) {
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FILE* f = fopen(path, "rb");
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unsigned char* d = NULL;
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char sig[3];
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unsigned char ver[2];
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unsigned char flag;
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unsigned char frame[4];
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unsigned int dsz = 0;
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if(f == NULL) return NULL;
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fread(sig, 3, 1, f);
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if(memcmp(sig, "ID3", 3) != 0) return NULL;
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fread(ver, 2, 1, f);
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if(memcmp(ver, "\x04\x00", 2) != 0 && memcmp(ver, "\x03\x00", 2) != 0) return NULL;
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fread(&flag, 1, 1, f);
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if(flag & (1 << 6)) return NULL; /* FIXME */
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if(flag & (1 << 7)) return NULL; /* what even is this??? */
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dsz = syncsafe(f);
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while(dsz > 0) {
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unsigned int fsz;
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fread(frame, 4, 1, f);
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if(frame[0] == 0) break; /* XXX: Is this ok? */
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if(memcmp(ver, "\x04\x00", 2) == 0) {
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fsz = syncsafe(f);
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} else {
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fsz = big(f);
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}
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fseek(f, 2, SEEK_CUR);
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if(memcmp(frame, "APIC", 4) == 0) {
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unsigned char* buffer = malloc(fsz);
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int i;
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fread(buffer, fsz, 1, f);
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for(i = 1; i < fsz; i++) {
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if(buffer[i] == 0) break;
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}
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i++;
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/* XXX: 0 is technically Other - am not sure if this should be done... */
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if(buffer[i] == 0 || buffer[i] == 3) {
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int count = (buffer[0] == 1 || buffer[0] == 2) ? 2 : 1;
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i++;
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for(; i < fsz; i++) {
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if(buffer[i] == 0) count--;
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if(count == 0) break;
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}
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i++;
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d = malloc(fsz - i);
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memcpy(d, buffer + i, fsz - i);
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*size = fsz - i;
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}
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free(buffer);
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if(d != NULL) break;
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} else {
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fseek(f, fsz, SEEK_CUR);
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}
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dsz -= 4 + 4 + 2 + fsz;
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}
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fclose(f);
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return d;
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}
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