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- /*!
- * \file src/utils/binary.cpp
- * \brief Binary file reading utilities
- *
- * \author xythobuz
- */
-
- #include "utils/binary.h"
-
- BinaryFile::BinaryFile(const char *f) {
- file.open(f, std::ios_base::in | std::ios_base:: binary);
- }
-
- BinaryFile::~BinaryFile() {
- file.close();
- }
-
- long long BinaryFile::tell() {
- return file.tellg();
- }
-
- void BinaryFile::seek(long long pos) {
- file.seekg(pos);
- }
-
- uint8_t BinaryFile::readU8() {
- uint8_t ret;
- char *c = reinterpret_cast<char *>(&ret);
- file.read(c, 1);
- return ret;
- }
-
- uint16_t BinaryFile::readU16() {
- uint8_t a = readU8();
- uint8_t b = readU8();
- return ((uint16_t)a | (uint16_t)(b << 8));
- }
-
- uint32_t BinaryFile::readU32() {
- uint16_t a = readU16();
- uint16_t b = readU16();
- return ((uint32_t)a | (uint32_t)(b << 16));
- }
-
- uint64_t BinaryFile::readU64() {
- uint32_t a = readU32();
- uint32_t b = readU32();
- return ((uint64_t)a | ((uint64_t)b << 32));
- }
-
- float BinaryFile::readFloat() {
- uint32_t val = readU32();
- char *a = reinterpret_cast<char *>(&val);
-
- float ret;
- char *b = reinterpret_cast<char *>(&ret);
-
- for (int i = 0; i < 4; i++)
- b[i] = a[i];
-
- return ret;
- }
-
- namespace {
- /*! \fixme Left-Shift with signed integer is undefined!
- * So we can't use the same method as for unsigned integers.
- * Is there a portable way to read multi-byte signed integers,
- * without having to detect the endianness at run-time?
- */
- const int bigendiandetection = 1;
- #define ISBIGENDIAN() ((*(char *)&bigendiandetection) == 0)
-
- void swapByteOrder(char *d, unsigned int n) {
- if (ISBIGENDIAN()) {
- for (unsigned int i = 0; i < (n / 2); i++) {
- char tmp = d[i];
- d[i] = d[n - i - 1];
- d[n - i - 1] = tmp;
- }
- }
- }
- }
-
- int8_t BinaryFile::read8() {
- int8_t ret;
- char *p = reinterpret_cast<char *>(&ret);
- file.read(p, sizeof(ret));
- return ret;
- }
-
- int16_t BinaryFile::read16() {
- int16_t ret;
- char *p = reinterpret_cast<char *>(&ret);
- file.read(p, sizeof(ret));
- swapByteOrder(p, 2);
- return ret;
- }
-
- int32_t BinaryFile::read32() {
- int32_t ret;
- char *p = reinterpret_cast<char *>(&ret);
- file.read(p, sizeof(ret));
- swapByteOrder(p, 4);
- return ret;
- }
-
- int64_t BinaryFile::read64() {
- int64_t ret;
- char *p = reinterpret_cast<char *>(&ret);
- file.read(p, sizeof(ret));
- swapByteOrder(p, 8);
- return ret;
- }
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