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gptpart.c
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gptpart.c
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#include "gptpart.h"
#include <string.h>
int gpt_is_parted(GPTItem *item) {
return item->start_lba <= item->end_lba && memcmp(item->type_guid, GUID_EMPTY, sizeof(GPTGUID));
}
unsigned int crc32(const void *pdata, unsigned int size)
{
const unsigned char *data = (const unsigned char *)pdata;
unsigned int crc = 0xffffffffu;
for (unsigned int i = 0; i < size; i++)
{
crc = crc ^ data[i];
for (int j = 8; j > 0; j--)
{
crc = (crc >> 1) ^ (0xEDB88320U & ((crc & 1) ? 0xFFFFFFFF : 0));
}
}
return ~crc;
}
static uint32 _SEED_ = 32; //随机数种子
void RandomGUID(GPTGUID *guid) {
uint32 magic = ((uint64)guid); //选取一个magic,指针先转换成uint64再赋给magic避免某些编译器报错
uint32 offset = 0x12345;
for(int i = 0; i < 16; i++) {
(*guid)[i] = (_SEED_ = (_SEED_ * magic + offset) % 255);
};
}
int gpt_part_tool_initialize(GPTPartTool *pt, FSIO io) {
pt->pt.io = io;
pt->pt.create_part = gpt_create_part;
pt->pt.delete_part = gpt_delete_part;
pt->pt.enum_part = gpt_enum_part;
pt->pt.get_part_count = gpt_get_part_count;
pt->pt.query_part_info = gpt_query_part_info;
pt->pt.sync_with_disk = gpt_sync_with_disk;
pt->pt.make_part_table = gpt_make_part_table;
memset(&pt->header, 0, sizeof(GPTHeader));
memset(pt->items, 0, sizeof(pt->items));
pt->pt.io.read_lba(1, 1, &pt->header);
if(memcmp(pt->header.signature, "EFI PART", 8)) {
pt->is_valid_gpt_disk = 0;
} else pt->is_valid_gpt_disk = 1;
if(!pt->header.gpt_item_first_lba) //for some buggy gpt header...
pt->header.gpt_item_first_lba = 2;
pt->num_items = pt->header.gpt_part_count > 128 ? 128 : pt->header.gpt_part_count;
size_t read_size = (pt->num_items * sizeof(GPTItem));
size_t read_count = read_size % 512 ? (read_size / 512 + 1) : read_size / 512;
pt->pt.io.read_lba(pt->header.gpt_item_first_lba, pt->header.gpt_item_first_lba + read_count - 1, pt->items);
if(pt->header.backup_lba) { //有备份表
pt->pt.io.read_lba(pt->header.backup_lba, pt->header.backup_lba, &pt->header_backup);
} else {
memset(&pt->header_backup, 0, sizeof(GPTHeader));
}
return STATUS_SUCCESS;
}
#define CHECK_GPT_VALID if(!gpt->is_valid_gpt_disk) {return ERROR_TFS_INVALID_DISK;}
//内部使用,重做分区表crc32校验
void gpt_remake_crc32(GPTPartTool *gpt) {
gpt->header.gpt_part_crc32 = crc32(gpt->items, sizeof(gpt->items));
gpt->header.header_crc32 = 0;
unsigned int crc = crc32(&gpt->header, 92);
gpt->header.header_crc32 = crc;
if(gpt->header.backup_lba) { //备份表
memcpy(&gpt->header_backup, &gpt->header, sizeof(GPTHeader));
gpt->header_backup.header_lba = gpt->header.backup_lba;
gpt->header_backup.backup_lba = gpt->header.header_lba;
gpt->header_backup.header_crc32 = 0;
crc = crc32(&gpt->header_backup, 92);
gpt->header_backup.header_crc32 = crc;
}
}
int gpt_make_part_table(struct tagPartTool *pt, uint64 disk_size_in_byte) {
GPTPartTool *gpt = (GPTPartTool *)pt;
//
uint64 size_in_byte = disk_size_in_byte;
uint64 last_lba = size_in_byte / 512 - 2;
uint64 cur_lba = 0;
{ //mbr
char mbr[512];
memset(mbr, 0, sizeof(mbr));
mbr[0x1c0] = 0x01; //fixed
mbr[0x1c1] = 0x00;
mbr[0x1c2] = 0xee; //GPT signature
mbr[0x1c3] = 0xfe; //-|
mbr[0x1c4] = 0xff; // fixed
mbr[0x1c5] = 0xff; //
mbr[0x1c6] = 0x01; //-|
mbr[0x1c7] = mbr[0x1c8] = mbr[0x1c9] = 0;
unsigned long long selectors = (size_in_byte / 512 - 1) > 0xffffffffu ? 0xffffffffu : (size_in_byte / 512 - 1);
*((unsigned int*)&mbr[0x1ca]) = (unsigned int)selectors;
mbr[0x1fe] = 0x55;
mbr[0x1ff] = 0xaa;
gpt->pt.io.write_lba(cur_lba, cur_lba, mbr);
cur_lba++;
}
{ //gpt tables
GPTHeader gh;
GPTItem items[128];
memset(&gh, 0, sizeof(gh));
memset(items, 0, sizeof(items));
memcpy(gh.signature, "EFI PART", 8);
gh.version = 0x00010000;
gh.sizeof_header = 92;
gh.header_crc32 = 0;
gh.reserved = 0;
gh.header_lba = 1;
gh.backup_lba = last_lba + 1;
//gh.backup_lba = (size_in_byte / 512 - 1);
gh.first_partable_lba = 2048;
gh.last_partable_lba = last_lba;
RandomGUID(&gh.disk_guid);
gh.gpt_item_first_lba = 2;
gh.gpt_part_count = 128;
gh.gpt_item_size = 128;
//see also -->gpt_remake_crc32
gh.gpt_part_crc32 = crc32(items, sizeof(items));
unsigned int header_crc32 = crc32(&gh, 92);
gh.header_crc32 = header_crc32;
gpt->pt.io.write_lba(cur_lba, cur_lba, &gh);
cur_lba++;
char zeros[512] = {0};
for(int i = 2; i < 34; i++) { //空表项
gpt->pt.io.write_lba(cur_lba, cur_lba, zeros);
cur_lba++;
}
for(int i = 34; i <= last_lba; i++) { //数据区填0
gpt->pt.io.write_lba(cur_lba, cur_lba, zeros);
cur_lba++;
}
//写入备份表
gh.header_lba = gh.backup_lba;
gh.backup_lba = 1;
gh.header_crc32 = 0;
header_crc32 = crc32(&gh, 92);
gh.header_crc32 = header_crc32;
gpt->pt.io.write_lba(cur_lba, cur_lba, &gh);
cur_lba++;
}
gpt->is_valid_gpt_disk = 1; //设为合法的gpt磁盘
return STATUS_SUCCESS;
}
unsigned int gpt_get_part_count(PartTool *pt) {
GPTPartTool *gpt = (GPTPartTool *)pt;
CHECK_GPT_VALID
return (gpt)->num_items;
}
int gpt_create_part(PartTool *pt, PartInfo *info,FSHandle *target) {
GPTPartTool *gpt = (GPTPartTool *)pt;
CHECK_GPT_VALID
if(info->start_lba > info->end_lba)
return ERROR_TFS_INVALID_ARGUMENT;
if(info->start_lba < gpt->header.first_partable_lba || info->end_lba > gpt->header.last_partable_lba)
return ERROR_TFS_NO_SPACE;
GPTItem *item = NULL;
for(int i = 0; i < 128; i++) {
if(gpt_is_parted(&gpt->items[i])) { //与已有的分区冲突
GPTItem *p = &gpt->items[i];
if(!(info->start_lba > p->end_lba || info->end_lba < p->start_lba)) {
return ERROR_TFS_CONFLICT;
}
} else {
if(!item) {
item = &gpt->items[i];
}
}
}
if(item) {
/*
if(info->type >= PART_UNKNOWN)
return ERROR_TFS_INVALID_ARGUMENT;
*/
item->attributes = info->attribute;
memcpy(item->type_guid, info->type_guid, sizeof(GPTGUID));
memcpy(item->guid, info->guid, sizeof(GPTGUID));
//int is_le = check_is_LE(); //GPT分区表label是规定的小端序的
for(int i = 0; i < 36; i++) {
item->label[i*2] = info->label[i];
}
item->label[71] = 0;
item->start_lba = info->start_lba;
item->end_lba = info->end_lba;
gpt_remake_crc32(gpt);
if(target) {
*target = (FSHandle)item;
}
return STATUS_SUCCESS;
}else {
return ERROR_TFS_NO_SPACE;
}
return STATUS_SUCCESS;
}
int gpt_delete_part(PartTool *pt, FSHandle target) {
GPTPartTool *gpt = (GPTPartTool *)pt;
CHECK_GPT_VALID
GPTItem *item = (GPTItem *)target;
//不是从管理工具中得到的句柄
if(item < gpt->items || item >= (gpt->items + gpt->num_items))
return ERROR_TFS_INVALID_HANDLE;
memset(item, 0, sizeof(GPTItem));
gpt_remake_crc32(gpt);
return STATUS_SUCCESS;
}
FSHandle gpt_enum_part(PartTool *pt, FSHandle last) {
GPTPartTool *gpt = (GPTPartTool *)pt;
// CHECK_GPT_VALID
if(!gpt->is_valid_gpt_disk)
return 0;
GPTItem *last_item = (GPTItem *)last;
for(GPTItem *p = last_item ? (last_item + 1) : gpt->items; p < (gpt->items + gpt->num_items); p++) {
if(gpt_is_parted(p)) {
return (FSHandle)p;
}
}
return 0;
}
int gpt_query_part_info(PartTool *pt, FSHandle target, PartInfo *info) {
GPTPartTool *gpt = (GPTPartTool *)pt;
CHECK_GPT_VALID
if(target) {
GPTItem *item = (GPTItem *)target;
info->start_lba = item->start_lba;
info->end_lba = item->end_lba;
memcpy(info->guid, item->guid, sizeof(GPTGUID));
memcpy(info->type_guid, item->type_guid, sizeof(GPTGUID));
for(int i = 0; i < 36; i++) {
info->label[i] = item->label[i*2];
}
info->label[35] = 0;
for(int i = 0; i < PART_UNKNOWN; i++) {
if(!memcmp(PART_TYPE_GUID(i), item->type_guid, sizeof(GPTGUID))) {
info->type = PART_EMPTY + i;
return STATUS_SUCCESS;
}
}
info->type = PART_UNKNOWN;
return STATUS_SUCCESS;
} else {
return STATUS_FAILED;
}
return STATUS_SUCCESS;
}
int gpt_sync_with_disk(struct tagPartTool *pt) {
GPTPartTool *gpt = ((GPTPartTool *)pt);
CHECK_GPT_VALID
gpt_remake_crc32(gpt);
//主表表头
gpt->pt.io.write_lba(1, 1, &gpt->header);
//主表表项
gpt->num_items = gpt->header.gpt_part_count > 128 ? 128 : gpt->header.gpt_part_count;
size_t read_size = (gpt->num_items * sizeof(GPTItem));
size_t read_count = read_size % 512 ? (read_size / 512 + 1) : read_size / 512;
gpt->pt.io.write_lba(gpt->header.gpt_item_first_lba, gpt->header.gpt_item_first_lba + read_count - 1, gpt->items);
//备份表
if(gpt->header.backup_lba) {
gpt->pt.io.write_lba(gpt->header.backup_lba, gpt->header.backup_lba, &gpt->header_backup);
}
return STATUS_SUCCESS;
}
#undef CHECK_GPT_VALID