79 lines
2.1 KiB
C
79 lines
2.1 KiB
C
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/*
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* duk_hbuffer operations such as resizing and inserting/appending data to
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* a dynamic buffer.
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*/
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#include "duk_internal.h"
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/*
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* Resizing
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*/
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DUK_INTERNAL void duk_hbuffer_resize(duk_hthread *thr, duk_hbuffer_dynamic *buf, duk_size_t new_size) {
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void *res;
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duk_size_t prev_size;
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DUK_ASSERT(thr != NULL);
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DUK_ASSERT(buf != NULL);
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DUK_ASSERT(DUK_HBUFFER_HAS_DYNAMIC(buf));
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DUK_ASSERT(!DUK_HBUFFER_HAS_EXTERNAL(buf));
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/*
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* Maximum size check
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*/
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if (new_size > DUK_HBUFFER_MAX_BYTELEN) {
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DUK_ERROR_RANGE(thr, "buffer too long");
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DUK_WO_NORETURN(return;);
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}
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/*
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* Note: use indirect realloc variant just in case mark-and-sweep
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* (finalizers) might resize this same buffer during garbage
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* collection.
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*/
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res = DUK_REALLOC_INDIRECT(thr->heap, duk_hbuffer_get_dynalloc_ptr, (void *) buf, new_size);
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if (DUK_LIKELY(res != NULL || new_size == 0)) {
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/* 'res' may be NULL if new allocation size is 0. */
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DUK_DDD(DUK_DDDPRINT("resized dynamic buffer %p:%ld -> %p:%ld",
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(void *) DUK_HBUFFER_DYNAMIC_GET_DATA_PTR(thr->heap, buf),
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(long) DUK_HBUFFER_DYNAMIC_GET_SIZE(buf),
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(void *) res,
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(long) new_size));
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/*
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* The entire allocated buffer area, regardless of actual used
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* size, is kept zeroed in resizes for simplicity. If the buffer
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* is grown, zero the new part.
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*/
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prev_size = DUK_HBUFFER_DYNAMIC_GET_SIZE(buf);
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if (new_size > prev_size) {
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DUK_ASSERT(new_size - prev_size > 0);
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#if defined(DUK_USE_ZERO_BUFFER_DATA)
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duk_memzero((void *) ((char *) res + prev_size),
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(duk_size_t) (new_size - prev_size));
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#endif
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}
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DUK_HBUFFER_DYNAMIC_SET_SIZE(buf, new_size);
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DUK_HBUFFER_DYNAMIC_SET_DATA_PTR(thr->heap, buf, res);
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} else {
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DUK_ERROR_ALLOC_FAILED(thr);
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DUK_WO_NORETURN(return;);
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}
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DUK_ASSERT(res != NULL || new_size == 0);
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}
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DUK_INTERNAL void duk_hbuffer_reset(duk_hthread *thr, duk_hbuffer_dynamic *buf) {
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DUK_ASSERT(thr != NULL);
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DUK_ASSERT(buf != NULL);
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DUK_ASSERT(DUK_HBUFFER_HAS_DYNAMIC(buf));
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DUK_ASSERT(!DUK_HBUFFER_HAS_EXTERNAL(buf));
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duk_hbuffer_resize(thr, buf, 0);
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}
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