40 lines
1.3 KiB
C
40 lines
1.3 KiB
C
#include <c_FileInputStream.h>
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typedef struct {
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c_InStream_t base;
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FILE* fp;
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c_Allocator_t allocator;
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} c_FileInImpl_t;
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static c_err_t _FileIn_Read(c_InStream_t* self, void* buf, c_size_t len, c_size_t* bytes_read) {
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c_FileInImpl_t* impl = (c_FileInImpl_t*)self;
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if (!impl->fp || !buf || len == 0) return C_ERR_PARAM;
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c_size_t items = fread(buf, 1, (size_t)len, impl->fp);
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if (bytes_read) *bytes_read = items;
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if (items == 0 && ferror(impl->fp)) return C_ERR_FAIL;
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return (items == len) ? C_SUCCESS : C_ERR_OUTOFBOUND;
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}
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static void _FileIn_Destroy(c_InStream_t* self) {
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c_FileInImpl_t* impl = (c_FileInImpl_t*)self;
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c_Allocator_t alloc = impl->allocator;
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c_Allocator_Free(&alloc, impl);
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}
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static const c_InStreamVtbl_t g_FileInVtbl = { _FileIn_Read, _FileIn_Destroy };
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c_err_t c_FileInputStream_Create(c_InStream_t** out_stream, FILE* file_handle, c_Allocator_t* allocator) {
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if (!out_stream || !file_handle) return C_ERR_PARAM;
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c_Allocator_t alloc = allocator ? *allocator : c_DefaultAllocator;
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c_FileInImpl_t* impl = (c_FileInImpl_t*)c_Allocator_Calloc(&alloc, 1, sizeof(c_FileInImpl_t));
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if (!impl) return C_ERR_NOMEM;
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impl->base.vtbl = &g_FileInVtbl;
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impl->fp = file_handle;
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impl->allocator = alloc;
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*out_stream = &impl->base;
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return C_SUCCESS;
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}
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