InStream/OutStream

2026-09-07 21:22:01 +08:00
parent c7b6c90ec9
commit 4f5f022be5
20 changed files with 1145 additions and 0 deletions
@@ -0,0 +1,39 @@
+#include <c_FileInputStream.h>
+
+typedef struct {
+    c_InStream_t  base;
+    FILE*         fp;
+    c_Allocator_t allocator;
+} c_FileInImpl_t;
+
+static c_err_t _FileIn_Read(c_InStream_t* self, void* buf, c_size_t len, c_size_t* bytes_read) {
+    c_FileInImpl_t* impl = (c_FileInImpl_t*)self;
+    if (!impl->fp || !buf || len == 0) return C_ERR_PARAM;
+
+    c_size_t items = fread(buf, 1, (size_t)len, impl->fp);
+    if (bytes_read) *bytes_read = items;
+
+    if (items == 0 && ferror(impl->fp)) return C_ERR_FAIL;
+    return (items == len) ? C_SUCCESS : C_ERR_OUTOFBOUND;
+}
+
+static void _FileIn_Destroy(c_InStream_t* self) {
+    c_FileInImpl_t* impl = (c_FileInImpl_t*)self;
+    c_Allocator_t alloc = impl->allocator;
+    c_Allocator_Free(&alloc, impl);
+}
+
+static const c_InStreamVtbl_t g_FileInVtbl = { _FileIn_Read, _FileIn_Destroy };
+
+c_err_t c_FileInputStream_Create(c_InStream_t** out_stream, FILE* file_handle, c_Allocator_t* allocator) {
+    if (!out_stream || !file_handle) return C_ERR_PARAM;
+    c_Allocator_t alloc = allocator ? *allocator : c_DefaultAllocator;
+    c_FileInImpl_t* impl = (c_FileInImpl_t*)c_Allocator_Calloc(&alloc, 1, sizeof(c_FileInImpl_t));
+    if (!impl) return C_ERR_NOMEM;
+
+    impl->base.vtbl = &g_FileInVtbl;
+    impl->fp = file_handle;
+    impl->allocator = alloc;
+    *out_stream = &impl->base;
+    return C_SUCCESS;
+}