project_files/frontlib/util/buffer.c
author Medo <smaxein@googlemail.com>
Mon, 25 Jun 2012 00:42:07 +0200
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#include "buffer.h"
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#include "logging.h"
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#include "util.h"
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#include <stdlib.h>
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#include <limits.h>
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#include <string.h>
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#define MIN_VECTOR_CAPACITY 16
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struct _flib_vector {
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	void *data;
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	size_t size;
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	size_t capacity;
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};
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flib_vector *flib_vector_create() {
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	flib_vector *result = NULL;
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	flib_vector *tmpVector = flib_calloc(1, sizeof(flib_vector));
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	if(tmpVector) {
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		tmpVector->data = flib_malloc(MIN_VECTOR_CAPACITY);
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		if(tmpVector->data) {
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			tmpVector->size = 0;
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			tmpVector->capacity = MIN_VECTOR_CAPACITY;
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			result = tmpVector;
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			tmpVector = NULL;
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		}
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	}
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	flib_vector_destroy(tmpVector);
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	return result;
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}
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void flib_vector_destroy(flib_vector *vec) {
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	if(vec) {
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		free(vec->data);
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		free(vec);
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	}
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}
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static int setCapacity(flib_vector *vec, size_t newCapacity) {
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	if(newCapacity == vec->capacity) {
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		return 0;
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	}
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	void *newData = realloc(vec->data, newCapacity);
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	if(newData) {
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		vec->data = newData;
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		vec->capacity = newCapacity;
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		return 0;
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	} else {
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		return -1;
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	}
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}
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static int allocateExtraCapacity(flib_vector *vec, size_t extraCapacity) {
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	if(extraCapacity <= SIZE_MAX - vec->capacity) {
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		return setCapacity(vec, vec->capacity + extraCapacity);
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	} else {
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		return -1;
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	}
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}
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int flib_vector_resize(flib_vector *vec, size_t newSize) {
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	if(!vec) {
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		flib_log_e("null parameter in flib_vector_resize");
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		return -1;
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	}
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	if(vec->capacity < newSize) {
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		// Resize exponentially for constant amortized time,
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		// But at least by as much as we need of course
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		size_t extraCapacity = (vec->capacity)/2;
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		size_t minExtraCapacity = newSize - vec->capacity;
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		if(extraCapacity < minExtraCapacity) {
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			extraCapacity = minExtraCapacity;
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		}
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		if(allocateExtraCapacity(vec, extraCapacity)) {
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			allocateExtraCapacity(vec, minExtraCapacity);
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		}
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	} else if(vec->capacity/2 > newSize) {
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		size_t newCapacity = newSize+newSize/4;
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		if(newCapacity < MIN_VECTOR_CAPACITY) {
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			newCapacity = MIN_VECTOR_CAPACITY;
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		}
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		setCapacity(vec, newCapacity);
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	}
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	if(vec->capacity >= newSize) {
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		vec->size = newSize;
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		return 0;
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	} else {
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		return -1;
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	}
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}
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int flib_vector_append(flib_vector *vec, const void *data, size_t len) {
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	if(!vec) {
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		flib_log_e("null parameter in flib_vector_append");
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		return 0;
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	}
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	if(len > SIZE_MAX-vec->size) {
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		return 0;
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	}
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	size_t oldSize = vec->size;
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	if(flib_vector_resize(vec, vec->size+len)) {
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		return 0;
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	}
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	memmove(((uint8_t*)vec->data) + oldSize, data, len);
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	return len;
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}
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int flib_vector_appendf(flib_vector *vec, const char *fmt, ...) {
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	int result = -1;
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	if(!vec || !fmt) {
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		flib_log_e("null parameter in flib_vector_appendf");
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	} else {
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		va_list argp;
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		va_start(argp, fmt);
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		char *formatted = flib_vasprintf(fmt, argp);
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		va_end(argp);
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		if(formatted) {
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			size_t len = strlen(formatted);
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			if(flib_vector_append(vec, formatted, len) == len) {
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				result = 0;
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			}
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		}
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	}
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	return result;
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}
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flib_buffer flib_vector_as_buffer(flib_vector *vec) {
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	if(!vec) {
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		flib_log_e("null parameter in flib_vector_as_buffer");
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		flib_buffer result = {NULL, 0};
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		return result;
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	} else {
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		flib_buffer result = {vec->data, vec->size};
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		return result;
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	}
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}
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flib_constbuffer flib_vector_as_constbuffer(flib_vector *vec) {
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	if(!vec) {
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		flib_log_e("null parameter in flib_vector_as_constbuffer");
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		flib_constbuffer result = {NULL, 0};
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		return result;
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	} else {
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		flib_constbuffer result = {vec->data, vec->size};
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		return result;
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	}
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}
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void *flib_vector_data(flib_vector *vec) {
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	if(!vec) {
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		flib_log_e("null parameter in flib_vector_data");
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		return NULL;
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	} else {
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		return vec->data;
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	}
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}
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size_t flib_vector_size(flib_vector *vec) {
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	if(!vec) {
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		flib_log_e("null parameter in flib_vector_size");
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		return 0;
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	} else {
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		return vec->size;
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	}
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}