forked from KolibriOS/kolibrios
441 lines
17 KiB
C
441 lines
17 KiB
C
#include <stdarg.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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typedef struct {
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size_t length;
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size_t capacity;
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char *data;
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} String;
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typedef struct {
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char *image;
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int imageSize;
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const char *errorMessage;
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int bytesPerSector;
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int sectorsPerClaster;
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int reservedSectorCount;
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int numberOfFats;
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int maxRootEntries;
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int totalSectors;
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int sectorsPerFat;
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int firstFat;
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int rootDirectory;
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int dataRegion;
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} Fat12;
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typedef int (*ForEachCallback)(const char *, size_t, const uint8_t *, void *);
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// system-dependent
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static void mkdir(const char *name);
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// misc
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static void mkdir_p(const char *_name); // create folder creating its parents
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static uint16_t get16(const void *_from, int index); // get uint16_t from array at offset
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static uint32_t get32(const void *_from, int index); // get uint32_t from array at offset
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// fat12
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static int fat12__getItemNameSize(const void *_folderEntry);
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static void fat12__getItemName(const void *_folderEntry, void *_name);
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static int fat12__getNextClaster(const Fat12 *this, int currentClaster);
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static int fat12__getFile(const Fat12 *this, void *_buffer, int size, int claster);
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static int fat12__getOffsetByClaster(const Fat12 *this, int claster);
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static int fat12__forEachFile_handleFolderEntry(const Fat12 *this, int folderEntryOffset, String *name,
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ForEachCallback callback, void *callbackParam);
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static int fat12__forEachFile_handleFolder(const Fat12 *this, int claster, String *name,
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ForEachCallback callback, void *callbackParam);
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static int fat12__forEachFile(const Fat12 *this, ForEachCallback callback, void *callbackParam);
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static int fat12__open(Fat12 *this, const char *img);
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static int fat12__error(Fat12 *this, const char *errorMessage);
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static void mkdir(const char *name) {
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struct {
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int fn;
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int unused[4];
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char b;
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const char *path;
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} __attribute__((packed)) info;
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memset(&info, 0, sizeof(info));
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info.fn = 9;
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info.b = 0;
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info.path = name;
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asm volatile ("int $0x40"::"a"(70), "b"(&info));
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}
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static void mkdir_p(const char *_name) {
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char *name = calloc(strlen(_name) + 1, 1);
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strcpy(name, _name);
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char *ptr = name;
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while (ptr) {
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if (ptr != name) { *ptr = '/'; }
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ptr = strchr(ptr + 1, '/');
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if (ptr) { *ptr = 0; }
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mkdir(name);
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}
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}
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static uint32_t get32(const void *_from, int index) {
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const uint8_t *from = _from;
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return from[index] |
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(from[index + 1] << 8) |
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(from[index + 2] << 16) |
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(from[index + 3] << 24);
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}
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static uint16_t get16(const void *_from, int index) {
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const uint8_t *from = _from;
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return from[index] | (from[index + 1] << 8);
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}
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static int fat12__getNextClaster(const Fat12 *this, int currentClaster) {
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int nextClasterOffset = this->firstFat + currentClaster + (currentClaster >> 1);
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if (currentClaster % 2 == 0) {
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return get16(this->image, nextClasterOffset) & 0xfff;
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} else {
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return get16(this->image, nextClasterOffset) >> 4;
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}
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}
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static int fat12__getFile(const Fat12 *this, void *_buffer, int size, int claster) {
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int offset = 0;
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char *buffer = _buffer;
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while (claster < 0xff7) {
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int toCopy = this->bytesPerSector * this->sectorsPerClaster;
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void *clasterPtr = &this->image[fat12__getOffsetByClaster(this, claster)];
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claster = fat12__getNextClaster(this, claster);
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// if next claster is END OF FILE claster, copy only rest of file
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if (claster >= 0xff7) { toCopy = size % toCopy; }
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memcpy(&buffer[offset], clasterPtr, toCopy);
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offset += toCopy;
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}
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return 1;
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}
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static int fat12__getOffsetByClaster(const Fat12 *this, int claster) {
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return this->dataRegion + (claster - 2)
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* this->bytesPerSector * this->sectorsPerClaster;
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}
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static int fat12__getItemNameSize(const void *_folderEntry) {
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const uint8_t *folderEntry = _folderEntry;
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// Long File Name entry, not a file itself
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if ((folderEntry[11] & 0x0f) == 0x0f) { return 0; }
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if ((folderEntry[11 - 32] & 0x0f) != 0x0f) {
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// regular file "NAME8888" '.' "EXT" '\0'
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int length = 13;
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for (int i = 10; folderEntry[i] == ' ' && i != 7; i--) { length--; }
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for (int i = 7; folderEntry[i] == ' ' && i != 0 - 1; i--) { length--; }
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if (folderEntry[8] == ' ') { length--; } // no ext - no'.'
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return length;
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} else {
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// file with long name
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// format of Long File Name etries is described in fat12__getItemName
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int length = 1;
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for (int i = 1; i < 255 / 13; i++) {
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//! TODO: Add UTF-16 support
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length += 13;
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if (folderEntry[i * -32] & 0x40) {
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// if first char from back is 0xffff, this is stub after name
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// otherwice is last character, so we can return calculated length
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if (get16(folderEntry, i * -32 + 30) == 0xffff) { length--; } else { return length; }
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if (get16(folderEntry, i * -32 + 28) == 0xffff) { length--; } else { return length; }
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if (get16(folderEntry, i * -32 + 24) == 0xffff) { length--; } else { return length; }
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if (get16(folderEntry, i * -32 + 22) == 0xffff) { length--; } else { return length; }
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if (get16(folderEntry, i * -32 + 20) == 0xffff) { length--; } else { return length; }
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if (get16(folderEntry, i * -32 + 18) == 0xffff) { length--; } else { return length; }
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if (get16(folderEntry, i * -32 + 16) == 0xffff) { length--; } else { return length; }
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if (get16(folderEntry, i * -32 + 14) == 0xffff) { length--; } else { return length; }
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if (get16(folderEntry, i * -32 + 9) == 0xffff) { length--; } else { return length; }
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if (get16(folderEntry, i * -32 + 7) == 0xffff) { length--; } else { return length; }
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if (get16(folderEntry, i * -32 + 5) == 0xffff) { length--; } else { return length; }
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if (get16(folderEntry, i * -32 + 3) == 0xffff) { length--; } else { return length; }
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if (get16(folderEntry, i * -32 + 1) == 0xffff) { length--; } else { return length; }
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return length;
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}
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}
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}
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return 0; // WAT?
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}
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static void fat12__getItemName(const void *_folderEntry, void *_name) {
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const uint8_t *folderEntry = _folderEntry;
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uint8_t *name = _name;
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if ((folderEntry[11 - 32] & 0x0f) != 0x0f) {
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int length = 8;
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memset(name, 0, 13);
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memcpy(name, folderEntry, 8);
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while (name[length - 1] == ' ') { length--; }
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if (folderEntry[9] != ' ') {
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name[length++] = '.';
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memcpy(&name[length], &folderEntry[8], 3);
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length += 3;
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}
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while (name[length - 1] == ' ') { length--; }
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name[length] = '\0';
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} else {
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// previous folder entries hold long name in format:
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// 0 sequence nmber (in turn back to first Long File Name entry, from 1)
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// 1 - 10 file name next characters in utf-16
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// 11 file attributes (0x0f - LFN entry)
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// 12 reserved
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// 13 checksum
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// 14 - 25 file name next characters
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// 26 - 27 reserved
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// 28 - 31 file name next characters
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// in these entries name placed in sequential order
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// but first characters are located in first previous entry
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// next characters - in next previous etc.
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// if current entry is orificated by 0x40 - the entry is last (cinains last characters)
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// unneed places for characters in the last entry are filled by 0xff
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int length = 0;
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for (int i = 1; i < 255 / 13; i++) {
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//! TODO: Add unicode support
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name[length++] = folderEntry[i * -32 + 1];
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name[length++] = folderEntry[i * -32 + 3];
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name[length++] = folderEntry[i * -32 + 5];
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name[length++] = folderEntry[i * -32 + 7];
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name[length++] = folderEntry[i * -32 + 9];
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name[length++] = folderEntry[i * -32 + 14];
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name[length++] = folderEntry[i * -32 + 16];
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name[length++] = folderEntry[i * -32 + 18];
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name[length++] = folderEntry[i * -32 + 20];
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name[length++] = folderEntry[i * -32 + 22];
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name[length++] = folderEntry[i * -32 + 24];
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name[length++] = folderEntry[i * -32 + 28];
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name[length++] = folderEntry[i * -32 + 30];
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if (folderEntry[i * -32] & 0x40) {
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while (name[length - 1] == 0xff) { name[--length] = 0; }
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name[length++] = 0;
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return;
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}
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}
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}
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}
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static int fat12__forEachFile_handleFolderEntry(const Fat12 *this, int folderEntryOffset, String *name,
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ForEachCallback callback, void *callbackParam) {
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int nameSize = 0;
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if (this->image[folderEntryOffset] == 0) { return 1; } // zero-entry, not file nor folder
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nameSize = fat12__getItemNameSize(&this->image[folderEntryOffset]); // includes sizeof '\0'
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if (nameSize != 0) {
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while (name->capacity < name->length + nameSize + 1) {
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name->capacity += name->capacity / 2;
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name->data = realloc(name->data, name->capacity);
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}
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name->data[name->length++] = '/';
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fat12__getItemName(&this->image[folderEntryOffset], &name->data[name->length]);
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name->length += nameSize - 1;
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if ((this->image[folderEntryOffset + 11] & 0x10)) {
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// the item is folder
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// handle folder only if it isn't current folder or parent one
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if (memcmp(&this->image[folderEntryOffset], ". ", 11) &&
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memcmp(&this->image[folderEntryOffset], ".. ", 11)) {
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if (!fat12__forEachFile_handleFolder(this, get16(this->image, folderEntryOffset + 26), name, callback, callbackParam)) {
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return 0;
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}
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}
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} else {
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// the item is a regular file
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void *buffer = NULL;
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int size = get32(this->image, folderEntryOffset + 28);
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int cluster = get16(this->image, folderEntryOffset + 26);
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buffer = malloc(size);
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if (!fat12__getFile(this, buffer, size, cluster)) {
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free(buffer);
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return 0;
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}
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callback(name->data, size, buffer, callbackParam);
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free(buffer);
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}
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name->length -= nameSize - 1; // substract length of current item name
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name->length--; // substract length of '/'
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name->data[name->length] = '\0';
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}
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return 1;
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}
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static int fat12__forEachFile_handleFolder(const Fat12 *this, int claster, String *name,
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ForEachCallback callback, void *callbackParam) {
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for (; claster < 0xff7; claster = fat12__getNextClaster(this, claster)) {
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int offset = fat12__getOffsetByClaster(this, claster);
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for (int i = 0; i < (this->bytesPerSector * this->sectorsPerClaster / 32); i++) {
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if (!fat12__forEachFile_handleFolderEntry(this, offset + 32 * i, name, callback, callbackParam)) {
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return 0;
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}
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}
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}
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return 1;
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}
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static int fat12__forEachFile(const Fat12 *this, ForEachCallback callback, void *callbackParam) {
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String name = { 0 };
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name.capacity = 4096;
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name.data = malloc(name.capacity);
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name.length = 0;
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name.data[0] = '\0';
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for (int i = 0; i < this->maxRootEntries; i++) {
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if (!fat12__forEachFile_handleFolderEntry(this, this->rootDirectory + 32 * i, &name, callback, callbackParam)) {
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free(name.data);
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return 0;
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}
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}
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free(name.data);
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return 1;
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}
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static int fat12__open(Fat12 *this, const char *img) {
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FILE *fp = NULL;
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if (!(fp = fopen(img, "rb"))) {
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return fat12__error(this, "Can't open imput file");
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}
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fseek(fp, 0, SEEK_END);
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this->imageSize = ftell(fp);
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rewind(fp);
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if (!(this->image = malloc(this->imageSize))) {
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return fat12__error(this, "Can't allocate memory for image");
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}
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fread(this->image, 1, this->imageSize, fp);
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fclose(fp);
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this->bytesPerSector = *(uint16_t *)((uintptr_t)this->image + 11);
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this->sectorsPerClaster = *(uint8_t *)((uintptr_t)this->image + 0x0d);
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this->reservedSectorCount = *(uint16_t *)((uintptr_t)this->image + 0x0e);
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this->numberOfFats = *(uint8_t *)((uintptr_t)this->image + 0x10);
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this->maxRootEntries = *(uint16_t *)((uintptr_t)this->image + 0x11);
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this->totalSectors = *(uint16_t *)((uintptr_t)this->image + 0x13);
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if (!this->totalSectors) {
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this->totalSectors = *(uint32_t *)((uintptr_t)this->image + 0x20);
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}
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this->sectorsPerFat = *(uint16_t *)((uintptr_t)this->image + 0x16);
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this->firstFat = (0 + this->reservedSectorCount) * this->bytesPerSector;
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this->rootDirectory = this->firstFat + this->numberOfFats
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* this->sectorsPerFat * this->bytesPerSector;
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this->dataRegion = this->rootDirectory + this->maxRootEntries * 32;
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printf("\nBytes per sector: %d\n", this->bytesPerSector);
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printf("Sectors per claster: %d\n", this->sectorsPerClaster);
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printf("Reserver sector count: %d\n", this->reservedSectorCount);
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printf("Number of FATs: %d\n", this->numberOfFats);
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printf("Max root entries: %d\n", this->maxRootEntries);
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printf("Total sectors: %d\n", this->totalSectors);
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printf("Sectors per FAT: %d\n", this->sectorsPerFat);
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printf("First FAT: %d\n", this->firstFat);
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printf("Root directory: %d\n", this->rootDirectory);
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printf("Data region: %d\n\n", this->dataRegion);
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return 1;
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}
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static int fat12__error(Fat12 *this, const char *errorMessage) {
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this->errorMessage = errorMessage;
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return 0;
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}
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static int handleError(const Fat12 *fat12) {
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printf("Error in Fat12: %s\n", fat12->errorMessage);
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return -1;
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}
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void writeFile(const char *fileName, int size, const uint8_t *data) {
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// FILE *fp = NULL;
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// if (!(fp = fopen(fileName, "wb"))) { perror(NULL); }
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// fwrite(data, 1, size, fp);
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// fclose(fp);
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struct Info {
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int number;
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int reserved0;
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int reserved1;
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int dataSize;
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const void *data;
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char zero;
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const char *name;
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} __attribute__((packed)) *info = calloc(sizeof(struct Info), 1);
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info->number = 2; // create/overwrite file
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info->dataSize = size;
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info->data = data;
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info->zero = 0;
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info->name = fileName;
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asm volatile ("int $0x40" :: "a"(70), "b"(info));
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}
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static int callback(const char *name, size_t size, const uint8_t *data, void *param) {
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String *outputPath = param;
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while (outputPath->capacity < outputPath->length + strlen(name) + 1 + 1) {
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outputPath->capacity += outputPath->capacity / 2;
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outputPath->data = realloc(outputPath->data, outputPath->capacity);
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}
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strcat(outputPath->data, name);
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{ // don't let mkdir_p create folder where file should be located
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char *fileNameDelim = NULL;
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// no slash = no folders to create, outputPath->data contains only file name
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// yes, I know, outputPath->data always contains '/', but who knows...
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if ((fileNameDelim = strrchr(outputPath->data, '/'))) {
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*fileNameDelim = '\0';
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mkdir_p(outputPath->data);
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*fileNameDelim = '/';
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}
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}
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printf("Extracting %s\n", outputPath->data);
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writeFile(outputPath->data, size, data);
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outputPath->data[outputPath->length] = '\0';
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return 0;
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}
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int main(int argc, char **argv) {
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Fat12 fat12 = { 0 };
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char *imageFile = NULL;
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String outputFolder = { 0 };
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if (argc < 2) {
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puts(" Usage:\n");
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puts(" unimg \"/path/to/kolibri.img\" \"/optional/extract/path\"\n");
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return -1;
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} else {
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imageFile = argv[1];
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printf("File: %s\n", imageFile);
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}
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outputFolder.capacity = 4096;
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outputFolder.data = malloc(outputFolder.capacity);
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//! ACHTUNG: possible buffer overflow, is 4096 enough in KolibriOS?
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if (argc >= 3 && argv[2][0] != '-') strcpy(outputFolder.data, argv[2]);
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else {
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strcpy(outputFolder.data, "/tmp0/1");
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strcat(outputFolder.data, strrchr(imageFile, '/'));
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}
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outputFolder.length = strlen(outputFolder.data);
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if (!fat12__open(&fat12, imageFile)) {
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return handleError(&fat12);
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}
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if (!fat12__forEachFile(&fat12, callback, &outputFolder)) {
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return handleError(&fat12);
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}
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puts("\nDONE!\n");
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}
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