Initial commit, from CM's system/core

Change-Id: I9bcf09859a7171e4fbb869b1d2818b31b2677207
(cherry picked from commit 6384637a7c45be53c3478740ac643ae518c02450)

4 files changed, 640 insertions, 0 deletions

diff --git a/dtbhtool/Android.mk b/dtbhtool/Android.mk
new file mode 100644
index 0000000..9b49c7c
--- /dev/null
+++ b/dtbhtool/Android.mk
@@ -0,0 +1,40 @@
+LOCAL_PATH:= $(call my-dir)
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES := mkbootimg.c
+LOCAL_STATIC_LIBRARIES := libmincrypt
+
+LOCAL_MODULE := mkbootimg
+
+include $(BUILD_HOST_EXECUTABLE)
+
+include $(CLEAR_VARS)
+LOCAL_SRC_FILES := unpackbootimg.c
+LOCAL_MODULE := unpackbootimg
+include $(BUILD_HOST_EXECUTABLE)
+
+include $(CLEAR_VARS)
+LOCAL_SRC_FILES := mkbootimg.c
+LOCAL_STATIC_LIBRARIES := libmincrypt libcutils libc
+LOCAL_MODULE := utility_mkbootimg
+LOCAL_MODULE_TAGS := eng
+LOCAL_MODULE_STEM := mkbootimg
+LOCAL_MODULE_CLASS := UTILITY_EXECUTABLES
+LOCAL_UNSTRIPPED_PATH := $(PRODUCT_OUT)/symbols/utilities
+LOCAL_MODULE_PATH := $(PRODUCT_OUT)/utilities
+LOCAL_FORCE_STATIC_EXECUTABLE := true
+include $(BUILD_EXECUTABLE)
+
+include $(CLEAR_VARS)
+LOCAL_SRC_FILES := unpackbootimg.c
+LOCAL_STATIC_LIBRARIES := libcutils libc
+LOCAL_MODULE := utility_unpackbootimg
+LOCAL_MODULE_TAGS := eng
+LOCAL_MODULE_STEM := unpackbootimg
+LOCAL_MODULE_CLASS := UTILITY_EXECUTABLES
+LOCAL_UNSTRIPPED_PATH := $(PRODUCT_OUT)/symbols/utilities
+LOCAL_MODULE_PATH := $(PRODUCT_OUT)/utilities
+LOCAL_FORCE_STATIC_EXECUTABLE := true
+include $(BUILD_EXECUTABLE)
+
+$(call dist-for-goals,dist_files,$(LOCAL_BUILT_MODULE))
diff --git a/dtbhtool/bootimg.h b/dtbhtool/bootimg.h
new file mode 100644
index 0000000..4692f0c
--- /dev/null
+++ b/dtbhtool/bootimg.h
@@ -0,0 +1,100 @@
+/* tools/mkbootimg/bootimg.h
+**
+** Copyright 2007, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License"); 
+** you may not use this file except in compliance with the License. 
+** You may obtain a copy of the License at 
+**
+**     http://www.apache.org/licenses/LICENSE-2.0 
+**
+** Unless required by applicable law or agreed to in writing, software 
+** distributed under the License is distributed on an "AS IS" BASIS, 
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
+** See the License for the specific language governing permissions and 
+** limitations under the License.
+*/
+
+#ifndef _BOOT_IMAGE_H_
+#define _BOOT_IMAGE_H_
+
+typedef struct boot_img_hdr boot_img_hdr;
+
+#define BOOT_MAGIC "ANDROID!"
+#define BOOT_MAGIC_SIZE 8
+#define BOOT_NAME_SIZE 16
+#define BOOT_ARGS_SIZE 512
+
+struct boot_img_hdr
+{
+    unsigned char magic[BOOT_MAGIC_SIZE];
+
+    unsigned kernel_size;  /* size in bytes */
+    unsigned kernel_addr;  /* physical load addr */
+
+    unsigned ramdisk_size; /* size in bytes */
+    unsigned ramdisk_addr; /* physical load addr */
+
+    unsigned second_size;  /* size in bytes */
+    unsigned second_addr;  /* physical load addr */
+
+    unsigned tags_addr;    /* physical addr for kernel tags */
+    unsigned page_size;    /* flash page size we assume */
+    unsigned dt_size;      /* device tree in bytes */
+    unsigned unused;       /* future expansion: should be 0 */
+    unsigned char name[BOOT_NAME_SIZE]; /* asciiz product name */
+    
+    unsigned char cmdline[BOOT_ARGS_SIZE];
+
+    unsigned id[8]; /* timestamp / checksum / sha1 / etc */
+};
+
+/*
+** +-----------------+ 
+** | boot header     | 1 page
+** +-----------------+
+** | kernel          | n pages  
+** +-----------------+
+** | ramdisk         | m pages  
+** +-----------------+
+** | second stage    | o pages
+** +-----------------+
+** | device tree     | p pages
+** +-----------------+
+**
+** n = (kernel_size + page_size - 1) / page_size
+** m = (ramdisk_size + page_size - 1) / page_size
+** o = (second_size + page_size - 1) / page_size
+** p = (dt_size + page_size - 1) / page_size
+**
+** 0. all entities are page_size aligned in flash
+** 1. kernel and ramdisk are required (size != 0)
+** 2. second is optional (second_size == 0 -> no second)
+** 3. load each element (kernel, ramdisk, second) at
+**    the specified physical address (kernel_addr, etc)
+** 4. prepare tags at tag_addr.  kernel_args[] is
+**    appended to the kernel commandline in the tags.
+** 5. r0 = 0, r1 = MACHINE_TYPE, r2 = tags_addr
+** 6. if second_size != 0: jump to second_addr
+**    else: jump to kernel_addr
+*/
+
+#if 0
+typedef struct ptentry ptentry;
+
+struct ptentry {
+    char name[16];      /* asciiz partition name    */
+    unsigned start;     /* starting block number    */
+    unsigned length;    /* length in blocks         */
+    unsigned flags;     /* set to zero              */
+};
+
+/* MSM Partition Table ATAG
+**
+** length: 2 + 7 * n
+** atag:   0x4d534d70
+**         <ptentry> x n
+*/
+#endif
+
+#endif
diff --git a/dtbhtool/mkbootimg.c b/dtbhtool/mkbootimg.c
new file mode 100644
index 0000000..06fc95b
--- /dev/null
+++ b/dtbhtool/mkbootimg.c
@@ -0,0 +1,289 @@
+/* tools/mkbootimg/mkbootimg.c
+**
+** Copyright 2007, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License");
+** you may not use this file except in compliance with the License.
+** You may obtain a copy of the License at
+**
+**     http://www.apache.org/licenses/LICENSE-2.0
+**
+** Unless required by applicable law or agreed to in writing, software
+** distributed under the License is distributed on an "AS IS" BASIS,
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+** See the License for the specific language governing permissions and
+** limitations under the License.
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include "mincrypt/sha.h"
+#include "bootimg.h"
+
+static void *load_file(const char *fn, unsigned *_sz)
+{
+    char *data;
+    int sz;
+    int fd;
+
+    data = 0;
+    fd = open(fn, O_RDONLY);
+    if(fd < 0) return 0;
+
+    sz = lseek(fd, 0, SEEK_END);
+    if(sz < 0) goto oops;
+
+    if(lseek(fd, 0, SEEK_SET) != 0) goto oops;
+
+    data = (char*) malloc(sz);
+    if(data == 0) goto oops;
+
+    if(read(fd, data, sz) != sz) goto oops;
+    close(fd);
+
+    if(_sz) *_sz = sz;
+    return data;
+
+oops:
+    close(fd);
+    if(data != 0) free(data);
+    return 0;
+}
+
+int usage(void)
+{
+    fprintf(stderr,"usage: mkbootimg\n"
+            "       --kernel <filename>\n"
+            "       --ramdisk <filename>\n"
+            "       [ --second <2ndbootloader-filename> ]\n"
+            "       [ --cmdline <kernel-commandline> ]\n"
+            "       [ --board <boardname> ]\n"
+            "       [ --base <address> ]\n"
+            "       [ --pagesize <pagesize> ]\n"
+            "       [ --ramdisk_offset <address> ]\n"
+            "       [ --dt <filename> ]\n"
+            "       -o|--output <filename>\n"
+            );
+    return 1;
+}
+
+
+
+static unsigned char padding[131072] = { 0, };
+
+int write_padding(int fd, unsigned pagesize, unsigned itemsize)
+{
+    unsigned pagemask = pagesize - 1;
+    unsigned count;
+
+    if((itemsize & pagemask) == 0) {
+        return 0;
+    }
+
+    count = pagesize - (itemsize & pagemask);
+
+    if(write(fd, padding, count) != count) {
+        return -1;
+    } else {
+        return 0;
+    }
+}
+
+int main(int argc, char **argv)
+{
+    boot_img_hdr hdr;
+
+    char *kernel_fn = 0;
+    void *kernel_data = 0;
+    char *ramdisk_fn = 0;
+    void *ramdisk_data = 0;
+    char *second_fn = 0;
+    void *second_data = 0;
+    char *cmdline = "";
+    char *bootimg = 0;
+    char *board = "";
+    char *dt_fn = 0;
+    void *dt_data = 0;
+    unsigned pagesize = 2048;
+    int fd;
+    SHA_CTX ctx;
+    uint8_t* sha;
+    unsigned base           = 0x10000000;
+    unsigned kernel_offset  = 0x00008000;
+    unsigned ramdisk_offset = 0x01000000;
+    unsigned second_offset  = 0x00f00000;
+    unsigned tags_offset    = 0x00000100;
+
+    argc--;
+    argv++;
+
+    memset(&hdr, 0, sizeof(hdr));
+
+    while(argc > 0){
+        char *arg = argv[0];
+        char *val = argv[1];
+        if(argc < 2) {
+            return usage();
+        }
+        argc -= 2;
+        argv += 2;
+        if(!strcmp(arg, "--output") || !strcmp(arg, "-o")) {
+            bootimg = val;
+        } else if(!strcmp(arg, "--kernel")) {
+            kernel_fn = val;
+        } else if(!strcmp(arg, "--ramdisk")) {
+            ramdisk_fn = val;
+        } else if(!strcmp(arg, "--second")) {
+            second_fn = val;
+        } else if(!strcmp(arg, "--cmdline")) {
+            cmdline = val;
+        } else if(!strcmp(arg, "--base")) {
+            base = strtoul(val, 0, 16);
+        } else if(!strcmp(arg, "--kernel_offset")) {
+            kernel_offset = strtoul(val, 0, 16);
+        } else if(!strcmp(arg, "--ramdisk_offset")) {
+            ramdisk_offset = strtoul(val, 0, 16);
+        } else if(!strcmp(arg, "--second_offset")) {
+            second_offset = strtoul(val, 0, 16);
+        } else if(!strcmp(arg, "--tags_offset")) {
+            tags_offset = strtoul(val, 0, 16);
+        } else if(!strcmp(arg, "--board")) {
+            board = val;
+        } else if(!strcmp(arg,"--pagesize")) {
+            pagesize = strtoul(val, 0, 10);
+            if ((pagesize != 2048) && (pagesize != 4096) && (pagesize != 8192) && (pagesize != 16384) && (pagesize != 32768) && (pagesize != 65536) && (pagesize != 131072)) {
+                fprintf(stderr,"error: unsupported page size %d\n", pagesize);
+                return -1;
+            }
+        } else if(!strcmp(arg, "--dt")) {
+            dt_fn = val;
+        } else {
+            return usage();
+        }
+    }
+    hdr.page_size = pagesize;
+
+    hdr.kernel_addr =  base + kernel_offset;
+    hdr.ramdisk_addr = base + ramdisk_offset;
+    hdr.second_addr =  base + second_offset;
+    hdr.tags_addr =    base + tags_offset;
+
+    if(bootimg == 0) {
+        fprintf(stderr,"error: no output filename specified\n");
+        return usage();
+    }
+
+    if(kernel_fn == 0) {
+        fprintf(stderr,"error: no kernel image specified\n");
+        return usage();
+    }
+
+    if(ramdisk_fn == 0) {
+        fprintf(stderr,"error: no ramdisk image specified\n");
+        return usage();
+    }
+
+    if(strlen(board) >= BOOT_NAME_SIZE) {
+        fprintf(stderr,"error: board name too large\n");
+        return usage();
+    }
+
+    strcpy(hdr.name, board);
+
+    memcpy(hdr.magic, BOOT_MAGIC, BOOT_MAGIC_SIZE);
+
+    if(strlen(cmdline) > (BOOT_ARGS_SIZE - 1)) {
+        fprintf(stderr,"error: kernel commandline too large\n");
+        return 1;
+    }
+    strcpy((char*)hdr.cmdline, cmdline);
+
+    kernel_data = load_file(kernel_fn, &hdr.kernel_size);
+    if(kernel_data == 0) {
+        fprintf(stderr,"error: could not load kernel '%s'\n", kernel_fn);
+        return 1;
+    }
+
+    if(!strcmp(ramdisk_fn,"NONE")) {
+        ramdisk_data = 0;
+        hdr.ramdisk_size = 0;
+    } else {
+        ramdisk_data = load_file(ramdisk_fn, &hdr.ramdisk_size);
+        if(ramdisk_data == 0) {
+            fprintf(stderr,"error: could not load ramdisk '%s'\n", ramdisk_fn);
+            return 1;
+        }
+    }
+
+    if(second_fn) {
+        second_data = load_file(second_fn, &hdr.second_size);
+        if(second_data == 0) {
+            fprintf(stderr,"error: could not load secondstage '%s'\n", second_fn);
+            return 1;
+        }
+    }
+
+    if(dt_fn) {
+        dt_data = load_file(dt_fn, &hdr.dt_size);
+        if (dt_data == 0) {
+            fprintf(stderr,"error: could not load device tree image '%s'\n", dt_fn);
+            return 1;
+        }
+    }
+
+    /* put a hash of the contents in the header so boot images can be
+     * differentiated based on their first 2k.
+     */
+    SHA_init(&ctx);
+    SHA_update(&ctx, kernel_data, hdr.kernel_size);
+    SHA_update(&ctx, &hdr.kernel_size, sizeof(hdr.kernel_size));
+    SHA_update(&ctx, ramdisk_data, hdr.ramdisk_size);
+    SHA_update(&ctx, &hdr.ramdisk_size, sizeof(hdr.ramdisk_size));
+    SHA_update(&ctx, second_data, hdr.second_size);
+    SHA_update(&ctx, &hdr.second_size, sizeof(hdr.second_size));
+    if(dt_data) {
+        SHA_update(&ctx, dt_data, hdr.dt_size);
+        SHA_update(&ctx, &hdr.dt_size, sizeof(hdr.dt_size));
+    }
+    sha = SHA_final(&ctx);
+    memcpy(hdr.id, sha,
+           SHA_DIGEST_SIZE > sizeof(hdr.id) ? sizeof(hdr.id) : SHA_DIGEST_SIZE);
+
+    fd = open(bootimg, O_CREAT | O_TRUNC | O_WRONLY, 0644);
+    if(fd < 0) {
+        fprintf(stderr,"error: could not create '%s'\n", bootimg);
+        return 1;
+    }
+
+    if(write(fd, &hdr, sizeof(hdr)) != sizeof(hdr)) goto fail;
+    if(write_padding(fd, pagesize, sizeof(hdr))) goto fail;
+
+    if(write(fd, kernel_data, hdr.kernel_size) != hdr.kernel_size) goto fail;
+    if(write_padding(fd, pagesize, hdr.kernel_size)) goto fail;
+
+    if(write(fd, ramdisk_data, hdr.ramdisk_size) != hdr.ramdisk_size) goto fail;
+    if(write_padding(fd, pagesize, hdr.ramdisk_size)) goto fail;
+
+    if(second_data) {
+        if(write(fd, second_data, hdr.second_size) != hdr.second_size) goto fail;
+        if(write_padding(fd, pagesize, hdr.ramdisk_size)) goto fail;
+    }
+
+    if(dt_data) {
+        if(write(fd, dt_data, hdr.dt_size) != hdr.dt_size) goto fail;
+        if(write_padding(fd, pagesize, hdr.dt_size)) goto fail;
+    }
+    return 0;
+
+fail:
+    unlink(bootimg);
+    close(fd);
+    fprintf(stderr,"error: failed writing '%s': %s\n", bootimg,
+            strerror(errno));
+    return 1;
+}
diff --git a/dtbhtool/unpackbootimg.c b/dtbhtool/unpackbootimg.c
new file mode 100644
index 0000000..3d2fda7
--- /dev/null
+++ b/dtbhtool/unpackbootimg.c
@@ -0,0 +1,211 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <limits.h>
+#include <libgen.h>
+
+#include "mincrypt/sha.h"
+#include "bootimg.h"
+
+typedef unsigned char byte;
+
+int read_padding(FILE* f, unsigned itemsize, int pagesize)
+{
+    byte* buf = (byte*)malloc(sizeof(byte) * pagesize);
+    unsigned pagemask = pagesize - 1;
+    unsigned count;
+
+    if((itemsize & pagemask) == 0) {
+        free(buf);
+        return 0;
+    }
+
+    count = pagesize - (itemsize & pagemask);
+
+    fread(buf, count, 1, f);
+    free(buf);
+    return count;
+}
+
+void write_string_to_file(char* file, char* string)
+{
+    FILE* f = fopen(file, "w");
+    fwrite(string, strlen(string), 1, f);
+    fwrite("\n", 1, 1, f);
+    fclose(f);
+}
+
+int usage() {
+    printf("usage: unpackbootimg\n");
+    printf("\t-i|--input boot.img\n");
+    printf("\t[ -o|--output output_directory]\n");
+    printf("\t[ -p|--pagesize <size-in-hexadecimal> ]\n");
+    return 0;
+}
+
+int main(int argc, char** argv)
+{
+    char tmp[PATH_MAX];
+    char* directory = "./";
+    char* filename = NULL;
+    int pagesize = 0;
+
+    argc--;
+    argv++;
+    while(argc > 0){
+        char *arg = argv[0];
+        char *val = argv[1];
+        argc -= 2;
+        argv += 2;
+        if(!strcmp(arg, "--input") || !strcmp(arg, "-i")) {
+            filename = val;
+        } else if(!strcmp(arg, "--output") || !strcmp(arg, "-o")) {
+            directory = val;
+        } else if(!strcmp(arg, "--pagesize") || !strcmp(arg, "-p")) {
+            pagesize = strtoul(val, 0, 16);
+        } else {
+            return usage();
+        }
+    }
+    
+    if (filename == NULL) {
+        return usage();
+    }
+    
+    int total_read = 0;
+    FILE* f = fopen(filename, "rb");
+    boot_img_hdr header;
+
+    //printf("Reading header...\n");
+    int i;
+    for (i = 0; i <= 512; i++) {
+        fseek(f, i, SEEK_SET);
+        fread(tmp, BOOT_MAGIC_SIZE, 1, f);
+        if (memcmp(tmp, BOOT_MAGIC, BOOT_MAGIC_SIZE) == 0)
+            break;
+    }
+    total_read = i;
+    if (i > 512) {
+        printf("Android boot magic not found.\n");
+        return 1;
+    }
+    fseek(f, i, SEEK_SET);
+    printf("Android magic found at: %d\n", i);
+
+    fread(&header, sizeof(header), 1, f);
+    printf("BOARD_KERNEL_CMDLINE %s\n", header.cmdline);
+    printf("BOARD_KERNEL_BASE %08x\n", header.kernel_addr - 0x00008000);
+    printf("BOARD_RAMDISK_OFFSET %08x\n", header.ramdisk_addr - header.kernel_addr + 0x00008000);
+    printf("BOARD_SECOND_OFFSET %08x\n", header.second_addr - header.kernel_addr + 0x00008000);
+    printf("BOARD_TAGS_OFFSET %08x\n",header.tags_addr - header.kernel_addr + 0x00008000);
+    printf("BOARD_PAGE_SIZE %d\n", header.page_size);
+    printf("BOARD_SECOND_SIZE %d\n", header.second_size);
+    printf("BOARD_DT_SIZE %d\n", header.dt_size);
+    
+    if (pagesize == 0) {
+        pagesize = header.page_size;
+    }
+    
+    //printf("cmdline...\n");
+    sprintf(tmp, "%s/%s", directory, basename(filename));
+    strcat(tmp, "-cmdline");
+    write_string_to_file(tmp, header.cmdline);
+    
+    //printf("base...\n");
+    sprintf(tmp, "%s/%s", directory, basename(filename));
+    strcat(tmp, "-base");
+    char basetmp[200];
+    sprintf(basetmp, "%08x", header.kernel_addr - 0x00008000);
+    write_string_to_file(tmp, basetmp);
+
+    //printf("ramdisk_offset...\n");
+    sprintf(tmp, "%s/%s", directory, basename(filename));
+    strcat(tmp, "-ramdisk_offset");
+    char ramdisktmp[200];
+    sprintf(ramdisktmp, "%08x", header.ramdisk_addr - header.kernel_addr + 0x00008000);
+    write_string_to_file(tmp, ramdisktmp);
+
+    //printf("second_offset...\n");
+    sprintf(tmp, "%s/%s", directory, basename(filename));
+    strcat(tmp, "-second_offset");
+    char secondtmp[200];
+    sprintf(secondtmp, "%08x", header.second_addr - header.kernel_addr + 0x00008000);
+    write_string_to_file(tmp, secondtmp);
+
+    //printf("tags_offset...\n");
+    sprintf(tmp, "%s/%s", directory, basename(filename));
+    strcat(tmp, "-tags_offset");
+    char tagstmp[200];
+    sprintf(tagstmp, "%08x", header.tags_addr - header.kernel_addr + 0x00008000);
+    write_string_to_file(tmp, tagstmp);
+
+    //printf("pagesize...\n");
+    sprintf(tmp, "%s/%s", directory, basename(filename));
+    strcat(tmp, "-pagesize");
+    char pagesizetmp[200];
+    sprintf(pagesizetmp, "%d", header.page_size);
+    write_string_to_file(tmp, pagesizetmp);
+    
+    total_read += sizeof(header);
+    //printf("total read: %d\n", total_read);
+    total_read += read_padding(f, sizeof(header), pagesize);
+
+    sprintf(tmp, "%s/%s", directory, basename(filename));
+    strcat(tmp, "-zImage");
+    FILE *k = fopen(tmp, "wb");
+    byte* kernel = (byte*)malloc(header.kernel_size);
+    //printf("Reading kernel...\n");
+    fread(kernel, header.kernel_size, 1, f);
+    total_read += header.kernel_size;
+    fwrite(kernel, header.kernel_size, 1, k);
+    fclose(k);
+
+    //printf("total read: %d\n", header.kernel_size);
+    total_read += read_padding(f, header.kernel_size, pagesize);
+
+
+    byte* ramdisk = (byte*)malloc(header.ramdisk_size);
+    //printf("Reading ramdisk...\n");
+    fread(ramdisk, header.ramdisk_size, 1, f);
+    total_read += header.ramdisk_size;
+    sprintf(tmp, "%s/%s", directory, basename(filename));
+    if(ramdisk[0] == 0x02 && ramdisk[1]== 0x21)
+        strcat(tmp, "-ramdisk.lz4");
+    else
+        strcat(tmp, "-ramdisk.gz");
+    FILE *r = fopen(tmp, "wb");
+    fwrite(ramdisk, header.ramdisk_size, 1, r);
+    fclose(r);
+
+    total_read += read_padding(f, header.ramdisk_size, pagesize);
+
+    sprintf(tmp, "%s/%s", directory, basename(filename));
+    strcat(tmp, "-second");
+    FILE *s = fopen(tmp, "wb");
+    byte* second = (byte*)malloc(header.second_size);
+    //printf("Reading second...\n");
+    fread(second, header.second_size, 1, f);
+    total_read += header.second_size;
+    fwrite(second, header.second_size, 1, r);
+    fclose(s);
+
+    total_read += read_padding(f, header.second_size, pagesize);
+
+    sprintf(tmp, "%s/%s", directory, basename(filename));
+    strcat(tmp, "-dt");
+    FILE *d = fopen(tmp, "wb");
+    byte* dt = (byte*)malloc(header.dt_size);
+    //printf("Reading dt...\n");
+    fread(dt, header.dt_size, 1, f);
+    total_read += header.dt_size;
+    fwrite(dt, header.dt_size, 1, r);
+    fclose(d);
+    
+    fclose(f);
+    
+    //printf("Total Read: %d\n", total_read);
+    return 0;
+}