fix: windows fseek. (#74)

src/transformer.cpp

@@ -285,15 +285,8 @@ TransformerSpec Transformer::loadSpecFromFile(const char* path, const unsigned i
     printf("💡 nSlices: %d\n", spec.nSlices);
     printf("💡 ropeTheta: %.1f\n", spec.ropeTheta);
 
-    fseek(fd, 0, SEEK_END);
-    long fileSize = ftell(fd);
-    if (fileSize == -1L) {
-        fclose(fd);
-        throw std::runtime_error("Error determining model file size");
-    }
+    spec.fileSize = (size_t)seekToEnd(fd);
     fclose(fd);
-
-    spec.fileSize = static_cast<size_t>(fileSize);
     return spec;
 }
 

src/utils.cpp

@@ -63,6 +63,16 @@ float randomF32(unsigned long long *state) {
     return (randomU32(state) >> 8) / 16777216.0f;
 }
 
+long seekToEnd(FILE* file) {
+#ifdef _WIN32
+    _fseeki64(file, 0, SEEK_END);
+    return _ftelli64(file);
+#else
+    fseek(file, 0, SEEK_END);
+    return ftell(file);
+#endif
+}
+
 void openMmapFile(MmapFile* file, const char* path, size_t size) {
     file->size = size;
 #ifdef _WIN32

src/utils.hpp

@@ -2,6 +2,7 @@
 #define UTILS_HPP
 
 #include <atomic>
+#include <cstdio>
 #include "common/pthread.h"
 
 #ifdef _WIN32
@@ -17,6 +18,7 @@ void freeBuffer(void* buffer);
 unsigned long timeMs();
 unsigned int randomU32(unsigned long long *state);
 float randomF32(unsigned long long *state);
+long seekToEnd(FILE* file);
 
 struct MmapFile {
     void* data;