Began inevetable rewrite.

1 files changed, 3 insertions, 134 deletions

diff --git a/src/main.c b/src/main.c
index 2ba65db..892958e 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,7 +1,9 @@
-/* This file is part of Nekopack.
+/* main.c -- Entry point to Nekopack.
 
    Copyright (C) 2017 Jakob Tsar-Fox, All Rights Reserved.
 
+   This file is part of Nekopack.
+
    Nekopack is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by the
    Free Software Foundation, either version 3 of the License, or (at
@@ -14,136 +16,3 @@
 
    You should have received a copy of the GNU General Public License
    along with Nekopack. If not, see <http://www.gnu.org/licenses/>. */
-
-#include <errno.h>
-#include <stdint.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "cli.h"
-#include "decompress.h"
-#include "extract.h"
-
-#define XP3_MAGIC "XP3\x0d\x0a\x20\x0a\x1a\x8b\x67\x01"
-#define XP3_TABLE_OFFSET 11
-#define XP3_VERSION_OFFSET 19
-
-void handle_archive(char *path);
-int is_xp3_archive(FILE *archive);
-int get_archive_version(FILE *archive);
-uint64_t get_table_offset(FILE *archive, uint8_t archive_version);
-
-/* Global instance of the command-line configuration structure. */
-struct configuration arguments;
-
-
-int main(int argc, char *argv[]) {
-    arguments = parse_args(argc, argv);
-    for (int i = arguments.vararg_index; i < argc; i++)
-        handle_archive(argv[i]);
-    free(arguments.output);
-    return 0;
-}
-
-
-/* Extracts the archive at the specified path. */
-void handle_archive(char *path) {
-    FILE *archive = fopen(path, "rb");
-    if (archive == NULL) {
-        /* Including the expanded path in the error message is
-           much more useful to the user than `perror("fopen")`. */
-        perror(path);
-        exit(EXIT_FAILURE);
-    } else if (!is_xp3_archive(archive)) {
-        fprintf(stderr, "%s is not an XP3 archive.\n", path);
-        fclose(archive);
-        exit(EXIT_FAILURE);
-    }
-
-    int archive_version = get_archive_version(archive);
-    uint64_t table_offset = get_table_offset(archive, archive_version);
-
-    uint8_t compressed;
-    uint64_t compressed_size, decompressed_size;
-    fseek(archive, table_offset, SEEK_SET);
-    fread(&compressed, sizeof(uint8_t), 1, archive);
-    fread(&compressed_size, sizeof(uint64_t), 1, archive);
-    fread(&decompressed_size, sizeof(uint64_t), 1, archive);
-
-    /* Every task that hasn't already been handled needs a
-       decompressed instance of the archive table. Decompression
-       done in memory because it's $CURRENT_YEAR. */
-    memory_stream data_stream;
-    memory_stream compressed_data = read_to_stream(archive, compressed_size);
-    if (compressed) {
-        data_stream = decompress_stream(compressed_data, decompressed_size);
-        free(compressed_data.start);
-    } else {
-        data_stream = compressed_data;
-    }
-
-    switch (arguments.mode) {
-        case EXTRACT:
-            extract(data_stream, archive);
-            break;
-        case LIST:
-            list(data_stream);
-    }
-
-    free(data_stream.start);
-    fclose(archive);
-}
-
-
-/* Check of the file's magic number to decide
-   whether or not the file a valid XP3 archive. */
-int is_xp3_archive(FILE *archive) {
-    int ret = 1;
-    char* buffer = malloc(11);
-    rewind(archive);
-    fread(buffer, 11, 1, archive);
-    if (memcmp(buffer, XP3_MAGIC, 11))
-        ret = 0;
-    free(buffer);
-    return ret;
-}
-
-
-/* Returns the version of XP3 used to pack the archive. */
-int get_archive_version(FILE *archive) {
-    uint32_t version;
-    fseek(archive, XP3_VERSION_OFFSET, SEEK_SET);
-    fread(&version, sizeof(uint32_t), 1, archive);
-    /* 0x00 indicates version 1, and 0x01 indicates version 2. */
-    return version == 1 ? 2 : 1;
-}
-
-
-/* Subroutine for finding the archive's table offset. If
-   the minor_version is invalid, the program will exit.  */
-uint64_t get_table_offset(FILE *archive, uint8_t archive_version) {
-    uint64_t table_offset;
-    fseek(archive, XP3_TABLE_OFFSET, SEEK_SET);
-    fread(&table_offset, sizeof(uint64_t), 1, archive);
-    if (archive_version == 1)
-        return table_offset;
-
-    /* The minor version is only present in XP3 version 2. */
-    uint32_t minor_version;
-    fread(&minor_version, sizeof(uint32_t), 1, archive);
-    if (minor_version != 1) {
-        fprintf(stderr, "Archive version not implemented.\n");
-        fclose(archive);
-        exit(EXIT_FAILURE);
-    }
-
-    /* The value initally read as table_offset is actually an offset to
-       the real table offset. (Try saying that five times fast.) */
-    fseek(archive, table_offset, SEEK_SET);
-    /* Table flags and size are ignored in the parsing process,
-       but are read anyway to advance the FILE pointer. */
-    fseek(archive, sizeof(uint8_t) + sizeof(uint64_t), SEEK_CUR);
-    fread(&table_offset, sizeof(uint64_t), 1, archive);
-    return table_offset;
-}