diff options
Diffstat (limited to 'c/src/lib/libbsp/arm/nds/tools/ndstool/include/crc.h')
| -rw-r--r-- | c/src/lib/libbsp/arm/nds/tools/ndstool/include/crc.h | 175 |
1 files changed, 0 insertions, 175 deletions
diff --git a/c/src/lib/libbsp/arm/nds/tools/ndstool/include/crc.h b/c/src/lib/libbsp/arm/nds/tools/ndstool/include/crc.h deleted file mode 100644 index 9dbbc71e2b..0000000000 --- a/c/src/lib/libbsp/arm/nds/tools/ndstool/include/crc.h +++ /dev/null @@ -1,175 +0,0 @@ -/* - Cyclic Redundancy Code (CRC) functions - by Rafael Vuijk (aka DarkFader) -*/ - -#ifndef __CRC_H -#define __CRC_H - -//#include "little.h" // FixCrc is not yet big endian compatible - -/* - * Data - */ -extern unsigned short ccitt16tab[]; -extern unsigned short crc16tab[]; -extern unsigned long crc32tab[]; - -/* - * Defines - */ -#define CRC_TEMPLATE template <typename CrcType, CrcType *crcTable> - -/* - * CalcCcitt - * Does not perform final inversion. - */ -#define CalcCcitt_ CalcCcitt<CrcType, crcTable> -#define CalcCcitt16 CalcCcitt<typeof(*ccitt16tab), ccitt16tab> -CRC_TEMPLATE inline CrcType CalcCcitt(unsigned char *data, unsigned int length, CrcType crc = (CrcType)0) -{ - for (unsigned int i=0; i<length; i++) - { - crc = (crc << 8) ^ crcTable[(crc >> 8) ^ data[i]]; - } - return crc; -} - -/* - * CalcCrc - * Does not perform final inversion. - */ -#define CalcCrc_ CalcCrc<CrcType, crcTable> -#define CalcCrc16 CalcCrc<typeof(*crc16tab), crc16tab> -#define CalcCrc32 CalcCrc<typeof(*crc32tab), crc32tab> -CRC_TEMPLATE inline CrcType CalcCrc(unsigned char *data, unsigned int length, CrcType crc = (CrcType)~0) -{ - for (unsigned int i=0; i<length; i++) - { - crc = (crc >> 8) ^ crcTable[(crc ^ data[i]) & 0xFF]; - } - return crc; -} - -/* - * FCalcCrc - * Does not perform final inversion. - */ -#define FCalcCrc_ FCalcCrc<CrcType, crcTable> -#define FCalcCrc16 FCalcCrc<typeof(*crc16tab), crc16tab> -#define FCalcCrc32 FCalcCrc<typeof(*crc32tab), crc32tab> -CRC_TEMPLATE inline CrcType FCalcCrc(FILE *f, unsigned int offset, unsigned int length, CrcType crc = (CrcType)~0) -{ - fseek(f, offset, SEEK_SET); - for (unsigned int i=0; i<length; i++) - { - crc = (crc >> 8) ^ crcTable[(crc ^ fgetc(f)) & 0xFF]; - } - return crc; -} - -/* - * RevCrc - * Reverse table lookup. - */ -#define RevCrc_ RevCrc<CrcType, crcTable> -CRC_TEMPLATE inline unsigned char RevCrc(unsigned char x, CrcType *value = 0) -{ - for (int y=0; y<256; y++) - { - if ((crcTable[y] >> (8*sizeof(CrcType)-8)) == x) - { - if (value) *value = crcTable[y]; - return y; - } - } - return 0; -} - -/* - * FixCrc - */ -#define FixCrc_ FixCrc<CrcType, crcTable> -#define FixCrc16 FixCrc<typeof(*crc16tab), crc16tab> -#define FixCrc32 FixCrc<typeof(*crc32tab), crc32tab> -CRC_TEMPLATE void FixCrc -( - unsigned char *data, // data to be patched - unsigned int patch_offset, unsigned char *patch_data, unsigned int patch_length, // patch data - unsigned int fix_offset = 0, // position to write the fix. by default, it is immediately after the patched data - CrcType initial_crc = (CrcType)~0 // useful when manually calculating leading data -) -{ - if (!fix_offset) fix_offset = patch_offset + patch_length; - - // calculate CRC after leading data - initial_crc = CalcCrc_(data, patch_offset, initial_crc); - - // calculate CRC before fix - unsigned char buf[2*sizeof(CrcType)]; - CrcType crc_before_fix = CalcCrc_(data + patch_offset, fix_offset - patch_offset); - *(CrcType *)(buf + 0) = crc_before_fix; - - // patch - memcpy(data + patch_offset, patch_data, patch_length); - - // calculate CRC after unfixed - CrcType crc_after_unfix = CalcCrc_(data + patch_offset, fix_offset - patch_offset + sizeof(CrcType)); - *(CrcType *)(buf + sizeof(CrcType)) = crc_after_unfix; - - // fix it - for (int i=sizeof(CrcType); i>=1; i--) - { - CrcType value; - unsigned char index = RevCrc_(buf[i + sizeof(CrcType) - 1], &value); - *(CrcType *)(buf + i) ^= value; - buf[i - 1] ^= index; - } - memcpy(data + fix_offset, buf, sizeof(CrcType)); -} - -/* - * FFixCrc - */ -#define FFixCrc_ FFixCrc<CrcType, crcTable> -#define FFixCrc16 FFixCrc<typeof(*crc16tab), crc16tab> -#define FFixCrc32 FFixCrc<typeof(*crc32tab), crc32tab> -CRC_TEMPLATE void FFixCrc -( - FILE *f, // file to be patched - unsigned int patch_offset, unsigned char *patch_data, unsigned int patch_length, // patch data - unsigned int fix_offset = 0, // position to write the fix. by default, it is immediately after the patched data - CrcType initial_crc = (CrcType)~0 // useful when manually calculating leading data -) -{ - if (!fix_offset) fix_offset = patch_offset + patch_length; - - // calculate CRC after leading data - initial_crc = FCalcCrc_(f, 0, patch_offset, initial_crc); - - // calculate CRC before fix - unsigned char buf[2*sizeof(CrcType)]; - CrcType crc_before_fix = FCalcCrc_(f, patch_offset, fix_offset - patch_offset); - *(CrcType *)(buf + 0) = crc_before_fix; - - // patch - fseek(f, patch_offset, SEEK_SET); - fwrite(patch_data, 1, patch_length, f); - - // calculate CRC after unfixed - CrcType crc_after_unfix = FCalcCrc_(f, patch_offset, fix_offset - patch_offset + sizeof(CrcType)); - *(CrcType *)(buf + sizeof(CrcType)) = crc_after_unfix; - - // fix it - for (int i=sizeof(CrcType); i>=1; i--) - { - CrcType value; - unsigned char index = RevCrc_(buf[i + sizeof(CrcType) - 1], &value); - *(CrcType *)(buf + i) ^= value; - buf[i - 1] ^= index; - } - fseek(f, fix_offset, SEEK_SET); - fwrite(buf, sizeof(CrcType), 1, f); -} - -#endif // __CRC_H |