74 lines
1.9 KiB
C
74 lines
1.9 KiB
C
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/*
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* Buffer
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*/
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#include "duk_internal.h"
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DUK_EXTERNAL void *duk_resize_buffer(duk_hthread *thr, duk_idx_t idx, duk_size_t new_size) {
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duk_hbuffer_dynamic *h;
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DUK_ASSERT_API_ENTRY(thr);
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h = (duk_hbuffer_dynamic *) duk_require_hbuffer(thr, idx);
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DUK_ASSERT(h != NULL);
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if (!(DUK_HBUFFER_HAS_DYNAMIC(h) && !DUK_HBUFFER_HAS_EXTERNAL(h))) {
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DUK_ERROR_TYPE(thr, DUK_STR_WRONG_BUFFER_TYPE);
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DUK_WO_NORETURN(return NULL;);
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}
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/* Maximum size check is handled by callee. */
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duk_hbuffer_resize(thr, h, new_size);
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return DUK_HBUFFER_DYNAMIC_GET_DATA_PTR(thr->heap, h);
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}
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DUK_EXTERNAL void *duk_steal_buffer(duk_hthread *thr, duk_idx_t idx, duk_size_t *out_size) {
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duk_hbuffer_dynamic *h;
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void *ptr;
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duk_size_t sz;
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DUK_ASSERT_API_ENTRY(thr);
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h = (duk_hbuffer_dynamic *) duk_require_hbuffer(thr, idx);
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DUK_ASSERT(h != NULL);
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if (!(DUK_HBUFFER_HAS_DYNAMIC(h) && !DUK_HBUFFER_HAS_EXTERNAL(h))) {
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DUK_ERROR_TYPE(thr, DUK_STR_WRONG_BUFFER_TYPE);
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DUK_WO_NORETURN(return NULL;);
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}
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/* Forget the previous allocation, setting size to 0 and alloc to
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* NULL. Caller is responsible for freeing the previous allocation.
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* Getting the allocation and clearing it is done in the same API
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* call to avoid any chance of a realloc.
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*/
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ptr = DUK_HBUFFER_DYNAMIC_GET_DATA_PTR(thr->heap, h);
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sz = DUK_HBUFFER_DYNAMIC_GET_SIZE(h);
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if (out_size) {
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*out_size = sz;
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}
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DUK_HBUFFER_DYNAMIC_SET_DATA_PTR_NULL(thr->heap, h);
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DUK_HBUFFER_DYNAMIC_SET_SIZE(h, 0);
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return ptr;
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}
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DUK_EXTERNAL void duk_config_buffer(duk_hthread *thr, duk_idx_t idx, void *ptr, duk_size_t len) {
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duk_hbuffer_external *h;
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DUK_ASSERT_API_ENTRY(thr);
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h = (duk_hbuffer_external *) duk_require_hbuffer(thr, idx);
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DUK_ASSERT(h != NULL);
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if (!DUK_HBUFFER_HAS_EXTERNAL(h)) {
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DUK_ERROR_TYPE(thr, DUK_STR_WRONG_BUFFER_TYPE);
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DUK_WO_NORETURN(return;);
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}
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DUK_ASSERT(DUK_HBUFFER_HAS_DYNAMIC(h));
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DUK_HBUFFER_EXTERNAL_SET_DATA_PTR(thr->heap, h, ptr);
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DUK_HBUFFER_EXTERNAL_SET_SIZE(h, len);
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}
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