diff --git a/src/opustags.c b/src/opustags.c
deleted file mode 100644
index 18713bf..0000000
--- a/src/opustags.c
+++ /dev/null
@@ -1,505 +0,0 @@
-#include <errno.h>
-#include <getopt.h>
-#include <limits.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <ogg/ogg.h>
-
-typedef struct {
-    uint32_t vendor_length;
-    const char *vendor_string;
-    uint32_t count;
-    uint32_t *lengths;
-    const char **comment;
-} opus_tags;
-
-int parse_tags(char *data, long len, opus_tags *tags){
-    long pos;
-    if(len < 8+4+4)
-        return -1;
-    if(strncmp(data, "OpusTags", 8) != 0)
-        return -1;
-    // Vendor
-    pos = 8;
-    tags->vendor_length = le32toh(*((uint32_t*) (data + pos)));
-    tags->vendor_string = data + pos + 4;
-    pos += 4 + tags->vendor_length;
-    if(pos + 4 > len)
-        return -1;
-    // Count
-    tags->count = le32toh(*((uint32_t*) (data + pos)));
-    if(tags->count == 0)
-        return 0;
-    tags->lengths = calloc(tags->count, sizeof(uint32_t));
-    if(tags->lengths == NULL)
-        return -1;
-    tags->comment = calloc(tags->count, sizeof(char*));
-    if(tags->comment == NULL){
-        free(tags->lengths);
-        return -1;
-    }
-    pos += 4;
-    // Comment
-    uint32_t i;
-    for(i=0; i<tags->count; i++){
-        tags->lengths[i] = le32toh(*((uint32_t*) (data + pos)));
-        tags->comment[i] = data + pos + 4;
-        pos += 4 + tags->lengths[i];
-        if(pos > len)
-            return -1;
-    }
-    if(pos != len)
-        return -1;
-    return 0;
-}
-
-int render_tags(opus_tags *tags, ogg_packet *op){
-    // Note: op->packet must be manually freed.
-    op->b_o_s = 0;
-    op->e_o_s = 0;
-    op->granulepos = 0;
-    op->packetno = 1;
-    long len = 8 + 4 + tags->vendor_length + 4;
-    uint32_t i;
-    for(i=0; i<tags->count; i++)
-        len += 4 + tags->lengths[i];
-    op->bytes = len;
-    char *data = malloc(len);
-    if(!data)
-        return -1;
-    op->packet = (unsigned char*) data;
-    uint32_t n;
-    memcpy(data, "OpusTags", 8);
-    n = htole32(tags->vendor_length);
-    memcpy(data+8, &n, 4);
-    memcpy(data+12, tags->vendor_string, tags->vendor_length);
-    data += 12 + tags->vendor_length;
-    n = htole32(tags->count);
-    memcpy(data, &n, 4);
-    data += 4;
-    for(i=0; i<tags->count; i++){
-        n = htole32(tags->lengths[i]);
-        memcpy(data, &n, 4);
-        memcpy(data+4, tags->comment[i], tags->lengths[i]);
-        data += 4 + tags->lengths[i];
-    }
-    return 0;
-}
-
-int match_field(const char *comment, uint32_t len, const char *field){
-    size_t field_len;
-    for(field_len = 0; field[field_len] != '\0' && field[field_len] != '='; field_len++);
-    if(len <= field_len)
-        return 0;
-    if(comment[field_len] != '=')
-        return 0;
-    if(strncmp(comment, field, field_len) != 0)
-        return 0;
-    return 1;
-
-}
-
-void delete_tags(opus_tags *tags, const char *field){
-    uint32_t i;
-    for(i=0; i<tags->count; i++){
-        if(match_field(tags->comment[i], tags->lengths[i], field)){
-            tags->count--;
-            tags->lengths[i] = tags->lengths[tags->count];
-            tags->comment[i] = tags->comment[tags->count];
-            // No need to resize the arrays.
-        }
-    }
-}
-
-int add_tags(opus_tags *tags, const char **tags_to_add, uint32_t count){
-    if(count == 0)
-        return 0;
-    uint32_t *lengths = realloc(tags->lengths, (tags->count + count) * sizeof(uint32_t));
-    const char **comment = realloc(tags->comment, (tags->count + count) * sizeof(char*));
-    if(lengths == NULL || comment == NULL)
-        return -1;
-    tags->lengths = lengths;
-    tags->comment = comment;
-    uint32_t i;
-    for(i=0; i<count; i++){
-        tags->lengths[tags->count + i] = strlen(tags_to_add[i]);
-        tags->comment[tags->count + i] = tags_to_add[i];
-    }
-    tags->count += count;
-    return 0;
-}
-
-void print_tags(opus_tags *tags){
-    if(tags->count == 0)
-        puts("no tags");
-    int i;
-    for(i=0; i<tags->count; i++){
-        fwrite(tags->comment[i], 1, tags->lengths[i], stdout);
-        puts("");
-    }
-}
-
-void free_tags(opus_tags *tags){
-    if(tags->count > 0){
-        free(tags->lengths);
-        free(tags->comment);
-    }
-}
-
-int write_page(ogg_page *og, FILE *stream){
-    if(fwrite(og->header, 1, og->header_len, stream) < og->header_len)
-        return -1;
-    if(fwrite(og->body, 1, og->body_len, stream) < og->body_len)
-        return -1;
-    return 0;
-}
-
-const char *version = "opustags version 1.1\n";
-
-const char *usage =
-    "Usage: opustags --help\n"
-    "       opustags [OPTIONS] FILE\n"
-    "       opustags OPTIONS FILE -o FILE\n";
-
-const char *help =
-    "Options:\n"
-    "  -h, --help              print this help\n"
-    "  -o, --output            write the modified tags to a file\n"
-    "  -i, --in-place [SUFFIX] use a temporary file then replace the original file\n"
-    "  -y, --overwrite         overwrite the output file if it already exists\n"
-    "  -d, --delete FIELD      delete all the fields of a specified type\n"
-    "  -a, --add FIELD=VALUE   add a field\n"
-    "  -s, --set FIELD=VALUE   delete then add a field\n"
-    "  -D, --delete-all        delete all the fields!\n"
-    "  -S, --set-all           read the fields from stdin\n";
-
-struct option options[] = {
-    {"help", no_argument, 0, 'h'},
-    {"output", required_argument, 0, 'o'},
-    {"in-place", optional_argument, 0, 'i'},
-    {"overwrite", no_argument, 0, 'y'},
-    {"delete", required_argument, 0, 'd'},
-    {"add", required_argument, 0, 'a'},
-    {"set", required_argument, 0, 's'},
-    {"delete-all", no_argument, 0, 'D'},
-    {"set-all", no_argument, 0, 'S'},
-    {NULL, 0, 0, 0}
-};
-
-int main(int argc, char **argv){
-    if(argc == 1){
-        fputs(version, stdout);
-        fputs(usage, stdout);
-        return EXIT_SUCCESS;
-    }
-    char *path_in, *path_out = NULL, *inplace = NULL;
-    const char* to_add[argc];
-    const char* to_delete[argc];
-    int count_add = 0, count_delete = 0;
-    int delete_all = 0;
-    int set_all = 0;
-    int overwrite = 0;
-    int print_help = 0;
-    int c;
-    while((c = getopt_long(argc, argv, "ho:i::yd:a:s:DS", options, NULL)) != -1){
-        switch(c){
-            case 'h':
-                print_help = 1;
-                break;
-            case 'o':
-                path_out = optarg;
-                break;
-            case 'i':
-                inplace = optarg == NULL ? ".otmp" : optarg;
-                break;
-            case 'y':
-                overwrite = 1;
-                break;
-            case 'd':
-                if(strchr(optarg, '=') != NULL){
-                    fprintf(stderr, "invalid field: '%s'\n", optarg);
-                    return EXIT_FAILURE;
-                }
-                to_delete[count_delete++] = optarg;
-                break;
-            case 'a':
-            case 's':
-                if(strchr(optarg, '=') == NULL){
-                    fprintf(stderr, "invalid comment: '%s'\n", optarg);
-                    return EXIT_FAILURE;
-                }
-                to_add[count_add++] = optarg;
-                if(c == 's')
-                    to_delete[count_delete++] = optarg;
-                break;
-            case 'S':
-                set_all = 1;
-            case 'D':
-                delete_all = 1;
-                break;
-            default:
-                return EXIT_FAILURE;
-        }
-    }
-    if(print_help){
-        puts(version);
-        puts(usage);
-        puts(help);
-        puts("See the man page for extensive documentation.");
-        return EXIT_SUCCESS;
-    }
-    if(optind != argc - 1){
-        fputs("invalid arguments\n", stderr);
-        return EXIT_FAILURE;
-    }
-    if(inplace && path_out){
-        fputs("cannot combine --in-place and --output\n", stderr);
-        return EXIT_FAILURE;
-    }
-    path_in = argv[optind];
-    if(path_out != NULL && strcmp(path_in, "-") != 0){
-        char canon_in[PATH_MAX+1], canon_out[PATH_MAX+1];
-        if(realpath(path_in, canon_in) && realpath(path_out, canon_out)){
-            if(strcmp(canon_in, canon_out) == 0){
-                fputs("error: the input and output files are the same\n", stderr);
-                return EXIT_FAILURE;
-            }
-        }
-    }
-    FILE *in;
-    if(strcmp(path_in, "-") == 0){
-        if(set_all){
-            fputs("can't open stdin for input when -S is specified\n", stderr);
-            return EXIT_FAILURE;
-        }
-        if(inplace){
-            fputs("cannot modify stdin 'in-place'\n", stderr);
-            return EXIT_FAILURE;
-        }
-        in = stdin;
-    }
-    else
-        in = fopen(path_in, "r");
-    if(!in){
-        perror("fopen");
-        return EXIT_FAILURE;
-    }
-    FILE *out = NULL;
-    if(inplace != NULL){
-        path_out = malloc(strlen(path_in) + strlen(inplace) + 1);
-        if(path_out == NULL){
-            fputs("failure to allocate memory\n", stderr);
-            fclose(in);
-            return EXIT_FAILURE;
-        }
-        strcpy(path_out, path_in);
-        strcat(path_out, inplace);
-    }
-    if(path_out != NULL){
-        if(strcmp(path_out, "-") == 0)
-            out = stdout;
-        else{
-            if(!overwrite && !inplace){
-                if(access(path_out, F_OK) == 0){
-                    fprintf(stderr, "'%s' already exists (use -y to overwrite)\n", path_out);
-                    fclose(in);
-                    return EXIT_FAILURE;
-                }
-            }
-            out = fopen(path_out, "w");
-            if(!out){
-                perror("fopen");
-                fclose(in);
-                if(inplace)
-                    free(path_out);
-                return EXIT_FAILURE;
-            }
-        }
-    }
-    ogg_sync_state oy;
-    ogg_stream_state os, enc;
-    ogg_page og;
-    ogg_packet op;
-    opus_tags tags;
-    ogg_sync_init(&oy);
-    char *buf;
-    size_t len;
-    char *error = NULL;
-    int packet_count = -1;
-    while(error == NULL){
-        // Read until we complete a page.
-        if(ogg_sync_pageout(&oy, &og) != 1){
-            if(feof(in))
-                break;
-            buf = ogg_sync_buffer(&oy, 65536);
-            if(buf == NULL){
-                error = "ogg_sync_buffer: out of memory";
-                break;
-            }
-            len = fread(buf, 1, 65536, in);
-            if(ferror(in))
-                error = strerror(errno);
-            ogg_sync_wrote(&oy, len);
-            if(ogg_sync_check(&oy) != 0)
-                error = "ogg_sync_check: internal error";
-            continue;
-        }
-        // We got a page.
-        // Short-circuit when the relevant packets have been read.
-        if(packet_count >= 2 && out){
-            if(write_page(&og, out) == -1){
-                error = "write_page: fwrite error";
-                break;
-            }
-            continue;
-        }
-        // Initialize the streams from the first page.
-        if(packet_count == -1){
-            if(ogg_stream_init(&os, ogg_page_serialno(&og)) == -1){
-                error = "ogg_stream_init: couldn't create a decoder";
-                break;
-            }
-            if(out){
-                if(ogg_stream_init(&enc, ogg_page_serialno(&og)) == -1){
-                    error = "ogg_stream_init: couldn't create an encoder";
-                    break;
-                }
-            }
-            packet_count = 0;
-        }
-        if(ogg_stream_pagein(&os, &og) == -1){
-            error = "ogg_stream_pagein: invalid page";
-            break;
-        }
-        // Read all the packets.
-        while(ogg_stream_packetout(&os, &op) == 1){
-            packet_count++;
-            if(packet_count == 1){ // Identification header
-                if(strncmp((char*) op.packet, "OpusHead", 8) != 0){
-                    error = "opustags: invalid identification header";
-                    break;
-                }
-            }
-            else if(packet_count == 2){ // Comment header
-                if(parse_tags((char*) op.packet, op.bytes, &tags) == -1){
-                    error = "opustags: invalid comment header";
-                    break;
-                }
-                if(delete_all)
-                    tags.count = 0;
-                else{
-                    int i;
-                    for(i=0; i<count_delete; i++)
-                        delete_tags(&tags, to_delete[i]);
-                }
-                char *raw_tags = NULL;
-                if(set_all){
-                    raw_tags = malloc(16384);
-                    if(raw_tags == NULL){
-                        error = "malloc: not enough memory for buffering stdin";
-                        free(raw_tags);
-                        break;
-                    }
-                    else{
-                        char *raw_comment[256];
-                        size_t raw_len = fread(raw_tags, 1, 16383, stdin);
-                        if(raw_len == 16383)
-                            fputs("warning: truncating comment to 16 KiB\n", stderr);
-                        raw_tags[raw_len] = '\0';
-                        uint32_t raw_count = 0;
-                        size_t field_len = 0;
-                        int caught_eq = 0;
-                        size_t i = 0;
-                        char *cursor = raw_tags;
-                        for(i=0; i <= raw_len && raw_count < 256; i++){
-                            if(raw_tags[i] == '\n' || raw_tags[i] == '\0'){
-                                if(field_len == 0)
-                                    continue;
-                                if(caught_eq)
-                                    raw_comment[raw_count++] = cursor;
-                                else
-                                    fputs("warning: skipping malformed tag\n", stderr);
-                                cursor = raw_tags + i + 1;
-                                field_len = 0;
-                                caught_eq = 0;
-                                raw_tags[i] = '\0';
-                                continue;
-                            }
-                            if(raw_tags[i] == '=')
-                                caught_eq = 1;
-                            field_len++;
-                        }
-                        add_tags(&tags, (const char**) raw_comment, raw_count);
-                    }
-                }
-                add_tags(&tags, to_add, count_add);
-                if(out){
-                    ogg_packet packet;
-                    render_tags(&tags, &packet);
-                    if(ogg_stream_packetin(&enc, &packet) == -1)
-                        error = "ogg_stream_packetin: internal error";
-                    free(packet.packet);
-                }
-                else
-                    print_tags(&tags);
-                free_tags(&tags);
-                if(raw_tags)
-                    free(raw_tags);
-                if(error || !out)
-                    break;
-                else
-                    continue;
-            }
-            if(out){
-                if(ogg_stream_packetin(&enc, &op) == -1){
-                    error = "ogg_stream_packetin: internal error";
-                    break;
-                }
-            }
-        }
-        if(error != NULL)
-            break;
-        if(ogg_stream_check(&os) != 0)
-            error = "ogg_stream_check: internal error (decoder)";
-        // Write the page.
-        if(out){
-            ogg_stream_flush(&enc, &og);
-            if(write_page(&og, out) == -1)
-                error = "write_page: fwrite error";
-            else if(ogg_stream_check(&enc) != 0)
-                error = "ogg_stream_check: internal error (encoder)";
-        }
-        else if(packet_count >= 2) // Read-only mode
-            break;
-    }
-    if(packet_count >= 0){
-        ogg_stream_clear(&os);
-        if(out)
-            ogg_stream_clear(&enc);
-    }
-    ogg_sync_clear(&oy);
-    fclose(in);
-    if(out)
-        fclose(out);
-    if(!error && packet_count < 2)
-        error = "opustags: invalid file";
-    if(error){
-        fprintf(stderr, "%s\n", error);
-        if(path_out != NULL && out != stdout)
-            remove(path_out);
-        if(inplace)
-            free(path_out);
-        return EXIT_FAILURE;
-    }
-    else if(inplace){
-        if(rename(path_out, path_in) == -1){
-            perror("rename");
-            free(path_out);
-            return EXIT_FAILURE;
-        }
-        free(path_out);
-    }
-    return EXIT_SUCCESS;
-}