#define LDLINUX_MAGIC 0x3eb202fe
enum bs_offsets {
- bsJump = 0x00,
- bsOemName = 0x03,
- bsBytesPerSec = 0x0b,
- bsSecPerClust = 0x0d,
- bsResSectors = 0x0e,
- bsFATs = 0x10,
- bsRootDirEnts = 0x11,
- bsSectors = 0x13,
- bsMedia = 0x15,
- bsFATsecs = 0x16,
- bsSecPerTrack = 0x18,
- bsHeads = 0x1a,
- bsHiddenSecs = 0x1c,
- bsHugeSectors = 0x20,
-
- /* FAT12/16 only */
- bs16DriveNumber = 0x24,
- bs16Reserved1 = 0x25,
- bs16BootSignature = 0x26,
- bs16VolumeID = 0x27,
- bs16VolumeLabel = 0x2b,
- bs16FileSysType = 0x36,
- bs16Code = 0x3e,
-
- /* FAT32 only */
- bs32FATSz32 = 36,
- bs32ExtFlags = 40,
- bs32FSVer = 42,
- bs32RootClus = 44,
- bs32FSInfo = 48,
- bs32BkBootSec = 50,
- bs32Reserved = 52,
- bs32DriveNumber = 64,
- bs32Reserved1 = 65,
- bs32BootSignature = 66,
- bs32VolumeID = 67,
- bs32VolumeLabel = 71,
- bs32FileSysType = 82,
- bs32Code = 90,
-
- bsSignature = 0x1fe
+ bsJump = 0x00,
+ bsOemName = 0x03,
+ bsBytesPerSec = 0x0b,
+ bsSecPerClust = 0x0d,
+ bsResSectors = 0x0e,
+ bsFATs = 0x10,
+ bsRootDirEnts = 0x11,
+ bsSectors = 0x13,
+ bsMedia = 0x15,
+ bsFATsecs = 0x16,
+ bsSecPerTrack = 0x18,
+ bsHeads = 0x1a,
+ bsHiddenSecs = 0x1c,
+ bsHugeSectors = 0x20,
+
+ /* FAT12/16 only */
+ bs16DriveNumber = 0x24,
+ bs16Reserved1 = 0x25,
+ bs16BootSignature = 0x26,
+ bs16VolumeID = 0x27,
+ bs16VolumeLabel = 0x2b,
+ bs16FileSysType = 0x36,
+ bs16Code = 0x3e,
+
+ /* FAT32 only */
+ bs32FATSz32 = 36,
+ bs32ExtFlags = 40,
+ bs32FSVer = 42,
+ bs32RootClus = 44,
+ bs32FSInfo = 48,
+ bs32BkBootSec = 50,
+ bs32Reserved = 52,
+ bs32DriveNumber = 64,
+ bs32Reserved1 = 65,
+ bs32BootSignature = 66,
+ bs32VolumeID = 67,
+ bs32VolumeLabel = 71,
+ bs32FileSysType = 82,
+ bs32Code = 90,
+
+ bsSignature = 0x1fe
};
#define bsHead bsJump
*/
static inline uint8_t get_8(const unsigned char *p)
{
- return *(const uint8_t *)p;
+ return *(const uint8_t *)p;
}
static inline uint16_t get_16(const unsigned char *p)
{
#if defined(__i386__) || defined(__x86_64__)
- /* Littleendian and unaligned-capable */
- return *(const uint16_t *)p;
+ /* Littleendian and unaligned-capable */
+ return *(const uint16_t *)p;
#else
- return (uint16_t)p[0] + ((uint16_t)p[1] << 8);
+ return (uint16_t) p[0] + ((uint16_t) p[1] << 8);
#endif
}
static inline uint32_t get_32(const unsigned char *p)
{
#if defined(__i386__) || defined(__x86_64__)
- /* Littleendian and unaligned-capable */
- return *(const uint32_t *)p;
+ /* Littleendian and unaligned-capable */
+ return *(const uint32_t *)p;
#else
- return (uint32_t)p[0] + ((uint32_t)p[1] << 8) +
- ((uint32_t)p[2] << 16) + ((uint32_t)p[3] << 24);
+ return (uint32_t) p[0] + ((uint32_t) p[1] << 8) +
+ ((uint32_t) p[2] << 16) + ((uint32_t) p[3] << 24);
#endif
}
static inline void set_16(unsigned char *p, uint16_t v)
{
#if defined(__i386__) || defined(__x86_64__)
- /* Littleendian and unaligned-capable */
- *(uint16_t *)p = v;
+ /* Littleendian and unaligned-capable */
+ *(uint16_t *) p = v;
#else
- p[0] = (v & 0xff);
- p[1] = ((v >> 8) & 0xff);
+ p[0] = (v & 0xff);
+ p[1] = ((v >> 8) & 0xff);
#endif
}
static inline void set_32(unsigned char *p, uint32_t v)
{
#if defined(__i386__) || defined(__x86_64__)
- /* Littleendian and unaligned-capable */
- *(uint32_t *)p = v;
+ /* Littleendian and unaligned-capable */
+ *(uint32_t *) p = v;
#else
- p[0] = (v & 0xff);
- p[1] = ((v >> 8) & 0xff);
- p[2] = ((v >> 16) & 0xff);
- p[3] = ((v >> 24) & 0xff);
+ p[0] = (v & 0xff);
+ p[1] = ((v >> 8) & 0xff);
+ p[2] = ((v >> 16) & 0xff);
+ p[3] = ((v >> 24) & 0xff);
#endif
}
void syslinux_make_bootsect(void *bs)
{
- unsigned char *bootsect = bs;
+ unsigned char *bootsect = bs;
- memcpy(bootsect+bsHead, syslinux_bootsect+bsHead, bsHeadLen);
- memcpy(bootsect+bsCode, syslinux_bootsect+bsCode, bsCodeLen);
+ memcpy(bootsect + bsHead, syslinux_bootsect + bsHead, bsHeadLen);
+ memcpy(bootsect + bsCode, syslinux_bootsect + bsCode, bsCodeLen);
}
/*
*/
const char *syslinux_check_bootsect(const void *bs)
{
- int veryold;
- int sectorsize;
- long long sectors, fatsectors, dsectors;
- long long clusters;
- int rootdirents, clustersize;
- const unsigned char *sectbuf = bs;
-
- veryold = 0;
-
- /* Must be 0xF0 or 0xF8..0xFF */
- if ( get_8(sectbuf+bsMedia) != 0xF0 &&
- get_8(sectbuf+bsMedia) < 0xF8 )
- goto invalid;
-
- sectorsize = get_16(sectbuf+bsBytesPerSec);
- if ( sectorsize == 512 )
- ; /* ok */
- else if ( sectorsize == 1024 || sectorsize == 2048 || sectorsize == 4096 )
- return "only 512-byte sectors are supported";
- else
- goto invalid;
-
- clustersize = get_8(sectbuf+bsSecPerClust);
- if ( clustersize == 0 || (clustersize & (clustersize-1)) )
- goto invalid; /* Must be nonzero and a power of 2 */
-
- sectors = get_16(sectbuf+bsSectors);
- sectors = sectors ? sectors : get_32(sectbuf+bsHugeSectors);
-
- dsectors = sectors - get_16(sectbuf+bsResSectors);
-
- fatsectors = get_16(sectbuf+bsFATsecs);
- fatsectors = fatsectors ? fatsectors : get_32(sectbuf+bs32FATSz32);
- fatsectors *= get_8(sectbuf+bsFATs);
- dsectors -= fatsectors;
-
- rootdirents = get_16(sectbuf+bsRootDirEnts);
- dsectors -= (rootdirents+sectorsize/32-1)/sectorsize;
-
- if ( dsectors < 0 || fatsectors == 0 )
- goto invalid;
-
- clusters = dsectors/clustersize;
-
- if ( clusters < 0xFFF5 ) {
- /* FAT12 or FAT16 */
-
- if ( !get_16(sectbuf+bsFATsecs) )
- goto invalid;
-
- if ( get_8(sectbuf+bs16BootSignature) == 0x29 ) {
- if ( !memcmp(sectbuf+bs16FileSysType, "FAT12 ", 8) ) {
- if ( clusters >= 0xFF5 )
- return "more than 4084 clusters but claims FAT12";
- } else if ( !memcmp(sectbuf+bs16FileSysType, "FAT16 ", 8) ) {
- if ( clusters < 0xFF5 )
- return "less than 4084 clusters but claims FAT16";
- } else if ( memcmp(sectbuf+bs16FileSysType, "FAT ", 8) ) {
- static char fserr[] = "filesystem type \"????????\" not supported";
- memcpy(fserr+17, sectbuf+bs16FileSysType, 8);
- return fserr;
- }
+ int veryold;
+ int sectorsize;
+ long long sectors, fatsectors, dsectors;
+ long long clusters;
+ int rootdirents, clustersize;
+ const unsigned char *sectbuf = bs;
+
+ veryold = 0;
+
+ /* Must be 0xF0 or 0xF8..0xFF */
+ if (get_8(sectbuf + bsMedia) != 0xF0 && get_8(sectbuf + bsMedia) < 0xF8)
+ goto invalid;
+
+ sectorsize = get_16(sectbuf + bsBytesPerSec);
+ if (sectorsize == 512) ; /* ok */
+ else if (sectorsize == 1024 || sectorsize == 2048 || sectorsize == 4096)
+ return "only 512-byte sectors are supported";
+ else
+ goto invalid;
+
+ clustersize = get_8(sectbuf + bsSecPerClust);
+ if (clustersize == 0 || (clustersize & (clustersize - 1)))
+ goto invalid; /* Must be nonzero and a power of 2 */
+
+ sectors = get_16(sectbuf + bsSectors);
+ sectors = sectors ? sectors : get_32(sectbuf + bsHugeSectors);
+
+ dsectors = sectors - get_16(sectbuf + bsResSectors);
+
+ fatsectors = get_16(sectbuf + bsFATsecs);
+ fatsectors = fatsectors ? fatsectors : get_32(sectbuf + bs32FATSz32);
+ fatsectors *= get_8(sectbuf + bsFATs);
+ dsectors -= fatsectors;
+
+ rootdirents = get_16(sectbuf + bsRootDirEnts);
+ dsectors -= (rootdirents + sectorsize / 32 - 1) / sectorsize;
+
+ if (dsectors < 0 || fatsectors == 0)
+ goto invalid;
+
+ clusters = dsectors / clustersize;
+
+ if (clusters < 0xFFF5) {
+ /* FAT12 or FAT16 */
+
+ if (!get_16(sectbuf + bsFATsecs))
+ goto invalid;
+
+ if (get_8(sectbuf + bs16BootSignature) == 0x29) {
+ if (!memcmp(sectbuf + bs16FileSysType, "FAT12 ", 8)) {
+ if (clusters >= 0xFF5)
+ return "more than 4084 clusters but claims FAT12";
+ } else if (!memcmp(sectbuf + bs16FileSysType, "FAT16 ", 8)) {
+ if (clusters < 0xFF5)
+ return "less than 4084 clusters but claims FAT16";
+ } else if (memcmp(sectbuf + bs16FileSysType, "FAT ", 8)) {
+ static char fserr[] =
+ "filesystem type \"????????\" not supported";
+ memcpy(fserr + 17, sectbuf + bs16FileSysType, 8);
+ return fserr;
+ }
+ }
+ } else if (clusters < 0x0FFFFFF5) {
+ /* FAT32 */
+ /* Moving the FileSysType and BootSignature was a lovely stroke of M$ idiocy */
+ if (get_8(sectbuf + bs32BootSignature) != 0x29 ||
+ memcmp(sectbuf + bs32FileSysType, "FAT32 ", 8))
+ goto invalid;
+ } else {
+ goto invalid;
}
- } else if ( clusters < 0x0FFFFFF5 ) {
- /* FAT32 */
- /* Moving the FileSysType and BootSignature was a lovely stroke of M$ idiocy */
- if ( get_8(sectbuf+bs32BootSignature) != 0x29 ||
- memcmp(sectbuf+bs32FileSysType, "FAT32 ", 8) )
- goto invalid;
- } else {
- goto invalid;
- }
-
- return NULL;
-
- invalid:
- return "this doesn't look like a valid FAT filesystem";
+
+ return NULL;
+
+invalid:
+ return "this doesn't look like a valid FAT filesystem";
}
/*
*
* Return 0 if successful, otherwise -1.
*/
-int syslinux_patch(const uint32_t *sectors, int nsectors,
+int syslinux_patch(const uint32_t * sectors, int nsectors,
int stupid, int raid_mode)
{
- unsigned char *patcharea, *p;
- int nsect = (syslinux_ldlinux_len+511) >> 9;
- uint32_t csum;
- int i, dw;
-
- if ( nsectors < nsect )
- return -1;
-
- /* Patch in options, as appropriate */
- if (stupid) {
- /* Access only one sector at a time */
- set_16(syslinux_bootsect+0x1FC, 1);
- }
-
- i = get_16(syslinux_bootsect+0x1FE);
- if (raid_mode)
- set_16(syslinux_bootsect+i, 0x18CD); /* INT 18h */
- set_16(syslinux_bootsect+0x1FE, 0xAA55);
-
- /* First sector need pointer in boot sector */
- set_32(syslinux_bootsect+0x1F8, *sectors++);
- nsect--;
-
- /* Search for LDLINUX_MAGIC to find the patch area */
- for ( p = syslinux_ldlinux ; get_32(p) != LDLINUX_MAGIC ; p += 4 );
- patcharea = p+8;
-
- /* Set up the totals */
- dw = syslinux_ldlinux_len >> 2; /* COMPLETE dwords! */
- set_16(patcharea, dw);
- set_16(patcharea+2, nsect); /* Does not include the first sector! */
-
- /* Set the sector pointers */
- p = patcharea+8;
-
- memset(p, 0, 64*4);
- while ( nsect-- ) {
- set_32(p, *sectors++);
- p += 4;
- }
-
- /* Now produce a checksum */
- set_32(patcharea+4, 0);
-
- csum = LDLINUX_MAGIC;
- for ( i = 0, p = syslinux_ldlinux ; i < dw ; i++, p += 4 )
- csum -= get_32(p); /* Negative checksum */
-
- set_32(patcharea+4, csum);
+ unsigned char *patcharea, *p;
+ int nsect = (syslinux_ldlinux_len + 511) >> 9;
+ uint32_t csum;
+ int i, dw;
+
+ if (nsectors < nsect)
+ return -1;
+
+ /* Patch in options, as appropriate */
+ if (stupid) {
+ /* Access only one sector at a time */
+ set_16(syslinux_bootsect + 0x1FC, 1);
+ }
+
+ i = get_16(syslinux_bootsect + 0x1FE);
+ if (raid_mode)
+ set_16(syslinux_bootsect + i, 0x18CD); /* INT 18h */
+ set_16(syslinux_bootsect + 0x1FE, 0xAA55);
+
+ /* First sector need pointer in boot sector */
+ set_32(syslinux_bootsect + 0x1F8, *sectors++);
+ nsect--;
+
+ /* Search for LDLINUX_MAGIC to find the patch area */
+ for (p = syslinux_ldlinux; get_32(p) != LDLINUX_MAGIC; p += 4) ;
+ patcharea = p + 8;
+
+ /* Set up the totals */
+ dw = syslinux_ldlinux_len >> 2; /* COMPLETE dwords! */
+ set_16(patcharea, dw);
+ set_16(patcharea + 2, nsect); /* Does not include the first sector! */
+
+ /* Set the sector pointers */
+ p = patcharea + 8;
+
+ memset(p, 0, 64 * 4);
+ while (nsect--) {
+ set_32(p, *sectors++);
+ p += 4;
+ }
+
+ /* Now produce a checksum */
+ set_32(patcharea + 4, 0);
+
+ csum = LDLINUX_MAGIC;
+ for (i = 0, p = syslinux_ldlinux; i < dw; i++, p += 4)
+ csum -= get_32(p); /* Negative checksum */
+
+ set_32(patcharea + 4, csum);
return 0;
}
projects / profile / ivi / syslinux.git / commitdiff