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173 lines
6.8 KiB
173 lines
6.8 KiB
/*
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*
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* Copyright 2015 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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#ifndef GRPC_SLICE_H
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#define GRPC_SLICE_H
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#include <grpc/support/port_platform.h>
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#include <grpc/impl/codegen/slice.h>
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#include <grpc/support/sync.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** Increment the refcount of s. Requires slice is initialized.
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Returns s. */
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GPRAPI grpc_slice grpc_slice_ref(grpc_slice s);
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/** Decrement the ref count of s. If the ref count of s reaches zero, all
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slices sharing the ref count are destroyed, and considered no longer
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initialized. If s is ultimately derived from a call to grpc_slice_new(start,
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len, dest) where dest!=NULL , then (*dest)(start) is called, else if s is
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ultimately derived from a call to grpc_slice_new_with_len(start, len, dest)
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where dest!=NULL , then (*dest)(start, len). Requires s initialized. */
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GPRAPI void grpc_slice_unref(grpc_slice s);
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/** Copy slice - create a new slice that contains the same data as s */
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GPRAPI grpc_slice grpc_slice_copy(grpc_slice s);
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/** Create a slice pointing at some data. Calls malloc to allocate a refcount
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for the object, and arranges that destroy will be called with the pointer
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passed in at destruction. */
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GPRAPI grpc_slice grpc_slice_new(void* p, size_t len, void (*destroy)(void*));
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/** Equivalent to grpc_slice_new, but with a separate pointer that is
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passed to the destroy function. This function can be useful when
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the data is part of a larger structure that must be destroyed when
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the data is no longer needed. */
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GPRAPI grpc_slice grpc_slice_new_with_user_data(void* p, size_t len,
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void (*destroy)(void*),
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void* user_data);
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/** Equivalent to grpc_slice_new, but with a two argument destroy function that
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also takes the slice length. */
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GPRAPI grpc_slice grpc_slice_new_with_len(void* p, size_t len,
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void (*destroy)(void*, size_t));
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/** Equivalent to grpc_slice_new(malloc(len), len, free), but saves one malloc()
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call.
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Aborts if malloc() fails. */
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GPRAPI grpc_slice grpc_slice_malloc(size_t length);
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GPRAPI grpc_slice grpc_slice_malloc_large(size_t length);
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#define GRPC_SLICE_MALLOC(len) grpc_slice_malloc(len)
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/** Intern a slice:
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The return value for two invocations of this function with the same sequence
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of bytes is a slice which points to the same memory. */
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GPRAPI grpc_slice grpc_slice_intern(grpc_slice slice);
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/** Create a slice by copying a string.
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Does not preserve null terminators.
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Equivalent to:
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size_t len = strlen(source);
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grpc_slice slice = grpc_slice_malloc(len);
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memcpy(slice->data, source, len); */
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GPRAPI grpc_slice grpc_slice_from_copied_string(const char* source);
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/** Create a slice by copying a buffer.
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Equivalent to:
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grpc_slice slice = grpc_slice_malloc(len);
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memcpy(slice->data, source, len); */
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GPRAPI grpc_slice grpc_slice_from_copied_buffer(const char* source, size_t len);
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/** Create a slice pointing to constant memory */
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GPRAPI grpc_slice grpc_slice_from_static_string(const char* source);
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/** Create a slice pointing to constant memory */
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GPRAPI grpc_slice grpc_slice_from_static_buffer(const void* source, size_t len);
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/** Return a result slice derived from s, which shares a ref count with \a s,
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where result.data==s.data+begin, and result.length==end-begin. The ref count
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of \a s is increased by one. Do not assign result back to \a s.
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Requires s initialized, begin <= end, begin <= s.length, and
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end <= source->length. */
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GPRAPI grpc_slice grpc_slice_sub(grpc_slice s, size_t begin, size_t end);
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/** The same as grpc_slice_sub, but without altering the ref count */
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GPRAPI grpc_slice grpc_slice_sub_no_ref(grpc_slice s, size_t begin, size_t end);
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/** Splits s into two: modifies s to be s[0:split], and returns a new slice,
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sharing a refcount with s, that contains s[split:s.length].
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Requires s intialized, split <= s.length */
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GPRAPI grpc_slice grpc_slice_split_tail(grpc_slice* s, size_t split);
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typedef enum {
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GRPC_SLICE_REF_TAIL = 1,
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GRPC_SLICE_REF_HEAD = 2,
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GRPC_SLICE_REF_BOTH = 1 + 2
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} grpc_slice_ref_whom;
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/** The same as grpc_slice_split_tail, but with an option to skip altering
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* refcounts (grpc_slice_split_tail_maybe_ref(..., true) is equivalent to
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* grpc_slice_split_tail(...)) */
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GPRAPI grpc_slice grpc_slice_split_tail_maybe_ref(grpc_slice* s, size_t split,
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grpc_slice_ref_whom ref_whom);
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/** Splits s into two: modifies s to be s[split:s.length], and returns a new
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slice, sharing a refcount with s, that contains s[0:split].
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Requires s intialized, split <= s.length */
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GPRAPI grpc_slice grpc_slice_split_head(grpc_slice* s, size_t split);
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GPRAPI grpc_slice grpc_empty_slice(void);
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GPRAPI uint32_t grpc_slice_default_hash_impl(grpc_slice s);
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GPRAPI int grpc_slice_default_eq_impl(grpc_slice a, grpc_slice b);
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GPRAPI int grpc_slice_eq(grpc_slice a, grpc_slice b);
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/** Returns <0 if a < b, ==0 if a == b, >0 if a > b
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The order is arbitrary, and is not guaranteed to be stable across different
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versions of the API. */
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GPRAPI int grpc_slice_cmp(grpc_slice a, grpc_slice b);
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GPRAPI int grpc_slice_str_cmp(grpc_slice a, const char* b);
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/** return non-zero if the first blen bytes of a are equal to b */
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GPRAPI int grpc_slice_buf_start_eq(grpc_slice a, const void* b, size_t blen);
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/** return the index of the last instance of \a c in \a s, or -1 if not found */
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GPRAPI int grpc_slice_rchr(grpc_slice s, char c);
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GPRAPI int grpc_slice_chr(grpc_slice s, char c);
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/** return the index of the first occurance of \a needle in \a haystack, or -1
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if it's not found */
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GPRAPI int grpc_slice_slice(grpc_slice haystack, grpc_slice needle);
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GPRAPI uint32_t grpc_slice_hash(grpc_slice s);
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/** Do two slices point at the same memory, with the same length
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If a or b is inlined, actually compares data */
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GPRAPI int grpc_slice_is_equivalent(grpc_slice a, grpc_slice b);
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/** Return a slice pointing to newly allocated memory that has the same contents
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* as \a s */
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GPRAPI grpc_slice grpc_slice_dup(grpc_slice a);
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/** Return a copy of slice as a C string. Offers no protection against embedded
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NULL's. Returned string must be freed with gpr_free. */
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GPRAPI char* grpc_slice_to_c_string(grpc_slice s);
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#ifdef __cplusplus
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}
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#endif
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#endif /* GRPC_SLICE_H */
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