From 983c964a11919f68f62d0a2193204789c27dc99c Mon Sep 17 00:00:00 2001 From: David Robillard Date: Sun, 23 Jan 2011 07:44:29 +0000 Subject: Streaming abbreviation. git-svn-id: http://svn.drobilla.net/serd/trunk@41 490d8e77-9747-427b-9fa3-0b8f29cee8a0 --- src/serd_stack.h | 79 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 79 insertions(+) create mode 100644 src/serd_stack.h (limited to 'src/serd_stack.h') diff --git a/src/serd_stack.h b/src/serd_stack.h new file mode 100644 index 00000000..95289e64 --- /dev/null +++ b/src/serd_stack.h @@ -0,0 +1,79 @@ +/* Serd, an RDF serialisation library. + * Copyright 2011 David Robillard + * + * Serd is free software: you can redistribute it and/or modify it under + * the terms of the GNU Lesser General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * Serd is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public + * License for details. + * + * You should have received a copy of the GNU Lesser General Public License + * along with this program. If not, see . + */ + +#ifndef SERD_STACK_H +#define SERD_STACK_H + +#include + +#include "serd/serd.h" + +/** An offset to start the stack at. Note 0 is reserved for NULL. */ +#define SERD_STACK_BOTTOM sizeof(void*) + +typedef struct { + uint8_t* buf; ///< Stack memory + size_t buf_size; ///< Allocated size of buf (>= size) + size_t size; ///< Conceptual size of stack in buf +} SerdStack; + +static inline SerdStack +serd_stack_new(size_t size) +{ + SerdStack stack; + stack.buf = malloc(size); + stack.buf_size = size; + stack.size = SERD_STACK_BOTTOM; + return stack; +} + +static inline bool +serd_stack_is_empty(SerdStack* stack) +{ + return stack->size <= SERD_STACK_BOTTOM; +} + +static inline void +serd_stack_free(SerdStack* stack) +{ + free(stack->buf); + stack->buf = NULL; + stack->buf_size = 0; + stack->size = 0; +} + +static inline uint8_t* +serd_stack_push(SerdStack* stack, size_t n_bytes) +{ + const size_t new_size = stack->size + n_bytes; + if (stack->buf_size < new_size) { + stack->buf_size *= 2; + stack->buf = realloc(stack->buf, stack->buf_size); + } + uint8_t* const ret = (stack->buf + stack->size); + stack->size = new_size; + return ret; +} + +static inline void +serd_stack_pop(SerdStack* stack, size_t n_bytes) +{ + assert(stack->size >= n_bytes); + stack->size -= n_bytes; +} + +#endif // SERD_STACK_H -- cgit v1.2.1