usbloadergx/source/banner/openingbnr.c

/****************************************************************************
 * USB Loader GX Team
 * openingbnr
 *
 * Extract opening.bnr/banner.bin/sound.bin/icon.bin
 *
 * Copyright 2008 Magicus <magicus@gmail.com>
 * Licensed under the terms of the GNU GPL, version 2
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
 * Version 1.0 Initial release
 ***************************************************************************/

#define _GNU_SOURCE

#include <ogcsys.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>

#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include "libfat/fat.h"

#include "MD5.h"
#include "banner.h"
#include "openingbnr.h"
#include "../ramdisk/ramdisk.h"
#include "FileOperations/fileops.h"

u16 be16(const u8 *p)
{
    return (p[0] << 8) | p[1];
}

u32 be32(const u8 *p)
{
    return (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3];
}

u64 be64(const u8 *p)
{
    return ((u64) be32(p) << 32) | be32(p + 4);
}

u64 be34(const u8 *p)
{
    return 4 * (u64) be32(p);
}

void wbe16(u8 *p, u16 x)
{
    p[0] = x >> 8;
    p[1] = x;
}

void wbe32(u8 *p, u32 x)
{
    wbe16(p, x >> 16);
    wbe16(p + 2, x);
}

void wbe64(u8 *p, u64 x)
{
    wbe32(p, x >> 32);
    wbe32(p + 4, x);
}

void md5(u8 *data, u32 len, u8 *hash)
{
    MD5(hash, data, len);
}

typedef struct
{
    u8 zeroes[0x40];
    u32 imet; // "IMET"
    u8 zero_six_zero_three[8]; // fixed, unknown purpose
    u32 sizes[3];
    u32 flag1;
    u16 name_jp[0x2a]; // might be empty
    u16 name_en[0x2a];
    u16 name_de[0x2a];
    u16 name_fr[0x2a];
    u16 name_es[0x2a];
    u16 name_it[0x2a];
    u16 name_nl[0x2a];
    u8 zeroes_2[0x348];
    u8 crypto[0x10];
} imet_data_t;

typedef struct
{
    u32 imd5_tag; // 0x494D4435 "IMD5";
    u32 size; // size of the rest of part B, starting from next field.
    u8 zeroes[8];
    u8 md5[16];
    u32 payload_tag; // 0x4C5A3737 "LZ77" if this is lz77
    u32 payload_data;
} imd5_header_t;

typedef struct
{
    u16 type;
    u16 name_offset;
    u32 data_offset; // == absolut offset fr<66>n U.8- headerns b<>rjan
    u32 size; // last included file num for directories
} U8_node;

typedef struct
{
    u32 tag; // 0x55AA382D "U.8-"
    u32 rootnode_offset; // offset to root_node, always 0x20.
    u32 header_size; // size of header from root_node to end of string table.
    u32 data_offset; // offset to data -- this is rootnode_offset + header_size, aligned to 0x40.
    u8 zeroes[16];
} U8_archive_header;

static int write_file(void* data, size_t size, char* name)
{
    size_t written = 0;
    FILE *out;
    out = fopen(name, "wb");
    if (out)
    {
        written = fwrite(data, 1, size, out);
        fclose(out);
    }
    return (written == size) ? 1 : -1;
}

u8* decompress_lz77(u8 *data, size_t data_size, size_t* decompressed_size)
{
    u8 *data_end;
    u8 *decompressed_data;
    size_t unpacked_size;
    u8 *in_ptr;
    u8 *out_ptr;
    u8 *out_end;

    in_ptr = data;
    data_end = data + data_size;

    // Assume this for now and grow when needed
    unpacked_size = data_size;

    decompressed_data = malloc(unpacked_size);
    out_end = decompressed_data + unpacked_size;

    out_ptr = decompressed_data;

    while (in_ptr < data_end)
    {
        int bit;
        u8 bitmask = *in_ptr;

        in_ptr++;
        for (bit = 0x80; bit != 0; bit >>= 1)
        {
            if (bitmask & bit)
            {
                // Next section is compressed
                u8 rep_length;
                u16 rep_offset;

                rep_length = (*in_ptr >> 4) + 3;
                rep_offset = *in_ptr & 0x0f;
                in_ptr++;
                rep_offset = *in_ptr | (rep_offset << 8);
                in_ptr++;
                if (out_ptr - decompressed_data < rep_offset)
                {
                    return NULL;
                }

                for (; rep_length > 0; rep_length--)
                {
                    *out_ptr = out_ptr[-rep_offset - 1];
                    out_ptr++;
                    if (out_ptr >= out_end)
                    {
                        // Need to grow buffer
                        decompressed_data = realloc(decompressed_data, unpacked_size * 2);
                        out_ptr = decompressed_data + unpacked_size;
                        unpacked_size *= 2;
                        out_end = decompressed_data + unpacked_size;
                    }
                }
            }
            else
            {
                // Just copy byte
                *out_ptr = *in_ptr;
                out_ptr++;
                if (out_ptr >= out_end)
                {
                    // Need to grow buffer
                    decompressed_data = realloc(decompressed_data, unpacked_size * 2);
                    out_ptr = decompressed_data + unpacked_size;
                    unpacked_size *= 2;
                    out_end = decompressed_data + unpacked_size;
                }
                in_ptr++;
            }
        }
    }

    *decompressed_size = (out_ptr - decompressed_data);
    return decompressed_data;
}

static int write_imd5_lz77(u8* data, size_t size, char* outname)
{
    imd5_header_t* header = (imd5_header_t*) data;
    u32 tag;
    u32 size_in_imd5;
    u8 md5_calc[16];
    u8 *decompressed_data;
    size_t decompressed_size;

    tag = be32((u8*) &header->imd5_tag);
    if (tag != 0x494D4435)
    {
        return -4;
    }

    md5(data + 32, size - 32, md5_calc);
    if (memcmp(&header->md5, md5_calc, 0x10))
    {
        return -5;
    }

    size_in_imd5 = be32((u8*) &header->size);
    if (size_in_imd5 != size - 32)
    {
        return -6;
    }

    tag = be32((u8*) &header->payload_tag);
    if (tag == 0x4C5A3737)
    {
        // "LZ77" - uncompress
        decompressed_data = decompress_lz77(data + sizeof(imd5_header_t), size - sizeof(imd5_header_t),
                &decompressed_size);
        if (decompressed_data == NULL) return -7;
        write_file(decompressed_data, decompressed_size, outname);
        //printf(", uncompressed %d bytes, md5 ok", decompressed_size);

        free(decompressed_data);
    }
    else
    {
        write_file(&header->payload_tag, size - 32, outname);
        //printf(", md5 ok");
    }
    return 0;
}

static int do_U8_archive(FILE *fp)
{
    U8_archive_header header;
    U8_node root_node;
    u32 tag;
    u32 num_nodes;
    U8_node* nodes;
    u8* string_table;
    size_t rest_size;
    unsigned int i;
    u32 data_offset;
    u32 current_offset;
    u16 dir_stack[16];
    int dir_index = 0;

    fread(&header, 1, sizeof header, fp);
    tag = be32((u8*) &header.tag);
    if (tag != 0x55AA382D)
    {
        return -1;
    }

    fread(&root_node, 1, sizeof(root_node), fp);
    num_nodes = be32((u8*) &root_node.size) - 1;
    //printf("Number of files: %d\n", num_nodes);

    nodes = malloc(sizeof(U8_node) * (num_nodes));
    fread(nodes, 1, num_nodes * sizeof(U8_node), fp);

    data_offset = be32((u8*) &header.data_offset);
    rest_size = data_offset - sizeof(header) - (num_nodes + 1) * sizeof(U8_node);

    string_table = malloc(rest_size);
    fread(string_table, 1, rest_size, fp);
    current_offset = data_offset;

    for (i = 0; i < num_nodes; i++)
    {
        U8_node* node = &nodes[i];
        u16 type = be16((u8*) &node->type);
        u16 name_offset = be16((u8*) &node->name_offset);
        u32 my_data_offset = be32((u8*) &node->data_offset);
        u32 size = be32((u8*) &node->size);
        char* name = (char*) &string_table[name_offset];
        u8* file_data;

        if (type == 0x0100)
        {
            // Directory
            mkdir(name, 0777);
            chdir(name);
            dir_stack[++dir_index] = size;
            //printf("%*s%s/\n", dir_index, "", name);
        }
        else
        {
            // Normal file
            u8 padding[32];

            if (type != 0x0000)
            {
                free(string_table);
                return -2;
            }

            if (current_offset < my_data_offset)
            {
                int diff = my_data_offset - current_offset;

                if (diff > 32)
                {
                    free(string_table);
                    return -3;
                }
                fread(padding, 1, diff, fp);
                current_offset += diff;
            }

            file_data = malloc(size);
            fread(file_data, 1, size, fp);
            //printf("%*s %s (%d bytes", dir_index, "", name, size);
            int result;
            result = write_imd5_lz77(file_data, size, name);
            if (result < 0)
            {
                free(string_table);
                return result;
            }
            //printf(")\n");
            current_offset += size;
        }

        while (dir_stack[dir_index] == i + 2 && dir_index > 0)
        {
            chdir("..");
            dir_index--;
        }
    }
    free(string_table);
    return 0;
}

static void do_imet_header(FILE *fp)
{
    imet_data_t header;

    fread(&header, 1, sizeof header, fp);

    write_file(&header, sizeof(header), "header.imet");
}

void do_U8_archivebanner(FILE *fp)
{
    U8_archive_header header;
    U8_node root_node;
    u32 tag;
    u32 num_nodes;
    U8_node* nodes;
    u8* string_table;
    size_t rest_size;
    unsigned int i;
    u32 data_offset;
    u16 dir_stack[16];
    int dir_index = 0;

    fread(&header, 1, sizeof header, fp);
    tag = be32((u8*) &header.tag);
    if (tag != 0x55AA382D)
    {
        //printf("No U8 tag");
        exit(0);
    }

    fread(&root_node, 1, sizeof(root_node), fp);
    num_nodes = be32((u8*) &root_node.size) - 1;
    printf("Number of files: %d\n", num_nodes);

    nodes = malloc(sizeof(U8_node) * (num_nodes));
    fread(nodes, 1, num_nodes * sizeof(U8_node), fp);

    data_offset = be32((u8*) &header.data_offset);
    rest_size = data_offset - sizeof(header) - (num_nodes + 1) * sizeof(U8_node);

    string_table = malloc(rest_size);
    fread(string_table, 1, rest_size, fp);

    for (i = 0; i < num_nodes; i++)
    {
        U8_node* node = &nodes[i];
        u16 type = be16((u8*) &node->type);
        u16 name_offset = be16((u8*) &node->name_offset);
        u32 my_data_offset = be32((u8*) &node->data_offset);
        u32 size = be32((u8*) &node->size);
        char* name = (char*) &string_table[name_offset];
        u8* file_data;

        if (type == 0x0100)
        {
            // Directory
            mkdir(name, 0777);
            chdir(name);
            dir_stack[++dir_index] = size;
            //printf("%*s%s/\n", dir_index, "", name);
        }
        else
        {
            // Normal file

            if (type != 0x0000)
            {
                printf("Unknown type");
                exit(0);
            }

            fseek(fp, my_data_offset, SEEK_SET);
            file_data = malloc(size);
            fread(file_data, 1, size, fp);
            write_file(file_data, size, name);
            free(file_data);
            //printf("%*s %s (%d bytes)\n", dir_index, "", name, size);
        }

        while (dir_stack[dir_index] == i + 2 && dir_index > 0)
        {
            chdir("..");
            dir_index--;
        }
    }
    free(string_table);
}

int extractbnrfile(const char * filepath, const char * destpath)
{
    int ret = -1;
    FILE *fp = fopen(filepath, "rb");
    if (fp)
    {
        CreateSubfolder(destpath);
        chdir(destpath);

        do_imet_header(fp);
        ret = do_U8_archive(fp);

        fclose(fp);
    }
    return ret;
}

int unpackBin(const char * filename, const char * outdir)
{
    FILE *fp = fopen(filename, "rb");
    ;
    if (fp)
    {
        CreateSubfolder(outdir);
        chdir(outdir);

        do_U8_archivebanner(fp);
        fclose(fp);
        return 1;
    }
    return 0;
}

#define TMP_PATH(s) "BANNER:/dump"s
//#define TMP_PATH(s) "SD:/dump"s

int unpackBanner(const u8 *gameid, int what, const char *outdir)
{

    char path[256];
    if (!ramdiskMount("BANNER", NULL)) return -1;

    CreateSubfolder(TMP_PATH( "/" ));
    s32 ret = dump_banner(gameid, TMP_PATH( "/opening.bnr" ));
    if (ret != 1)
    {
        ret = -1;
        goto error2;
    }

    ret = extractbnrfile(TMP_PATH( "/opening.bnr" ), TMP_PATH( "/" ));
    if (ret != 0)
    {
        ret = -1;
        goto error2;
    }

    if (what & UNPACK_BANNER_BIN)
    {
        snprintf(path, sizeof(path), "%sbanner/", outdir);
        ret = unpackBin(TMP_PATH( "/meta/banner.bin" ), path);
        if (ret != 1)
        {
            ret = -1;
            goto error2;
        }
    }
    if (what & UNPACK_ICON_BIN)
    {
        snprintf(path, sizeof(path), "%sicon/", outdir);
        ret = unpackBin(TMP_PATH( "/meta/icon.bin" ), path);
        if (ret != 1)
        {
            ret = -1;
            goto error2;
        }
    }
    if (what & UNPACK_SOUND_BIN)
    {
        snprintf(path, sizeof(path), "%ssound.bin", outdir);
        FILE *fp = fopen(TMP_PATH( "/meta/sound.bin" ), "rb");
        if (fp)
        {
            size_t size;
            u8 *data;
            fseek(fp, 0, SEEK_END);
            size = ftell(fp);
            if (!size)
            {
                ret = -1;
                goto error;
            }
            fseek(fp, 0, SEEK_SET);
            data = (u8 *) malloc(size);
            if (!data)
            {
                ret = -1;
                goto error;
            }
            if (fread(data, 1, size, fp) != size)
            {
                ret = -1;
                goto error;
            }
            ret = write_file(data, size, path);
        }
        error: fclose(fp);
    }
    ramdiskUnmount("BANNER");
    error2: if (ret < 0) return ret;
    return 1;
}