/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright 2016 Olaf Wintermann. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "buffer.h"
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
UcxBuffer *ucx_buffer_new(void *space, size_t capacity, int flags) {
UcxBuffer *buffer = (UcxBuffer*) malloc(sizeof(UcxBuffer));
if (buffer) {
buffer->flags = flags;
if (!space) {
buffer->space = (char*)malloc(capacity);
if (!buffer->space) {
free(buffer);
return NULL;
}
memset(buffer->space, 0, capacity);
buffer->flags |= UCX_BUFFER_AUTOFREE;
} else {
buffer->space = (char*)space;
}
buffer->capacity = capacity;
buffer->size = 0;
buffer->pos = 0;
}
return buffer;
}
void ucx_buffer_free(UcxBuffer *buffer) {
if ((buffer->flags & UCX_BUFFER_AUTOFREE) == UCX_BUFFER_AUTOFREE) {
free(buffer->space);
}
free(buffer);
}
UcxBuffer* ucx_buffer_extract(
UcxBuffer *src, size_t start, size_t length, int flags) {
if (src->size == 0 || length == 0 || start+length > src->capacity) {
return NULL;
}
UcxBuffer *dst = (UcxBuffer*) malloc(sizeof(UcxBuffer));
if (dst) {
dst->space = (char*)malloc(length);
if (!dst->space) {
free(dst);
return NULL;
}
dst->capacity = length;
dst->size = length;
dst->flags = flags | UCX_BUFFER_AUTOFREE;
dst->pos = 0;
memcpy(dst->space, src->space+start, length);
}
return dst;
}
int ucx_buffer_seek(UcxBuffer *buffer, off_t offset, int whence) {
size_t npos;
switch (whence) {
case SEEK_CUR:
npos = buffer->pos;
break;
case SEEK_END:
npos = buffer->size;
break;
case SEEK_SET:
npos = 0;
break;
default:
return -1;
}
size_t opos = npos;
npos += offset;
if ((offset > 0 && npos < opos) || (offset < 0 && npos > opos)) {
return -1;
}
if (npos >= buffer->size) {
return -1;
} else {
buffer->pos = npos;
return 0;
}
}
int ucx_buffer_eof(UcxBuffer *buffer) {
return buffer->pos >= buffer->size;
}
int ucx_buffer_extend(UcxBuffer *buffer, size_t len) {
size_t newcap = buffer->capacity;
if (buffer->capacity + len < buffer->capacity) {
return -1;
}
while (buffer->capacity + len > newcap) {
newcap <<= 1;
if (newcap < buffer->capacity) {
return -1;
}
}
char *newspace = (char*)realloc(buffer->space, newcap);
if (newspace) {
memset(newspace+buffer->size, 0, newcap-buffer->size);
buffer->space = newspace;
buffer->capacity = newcap;
} else {
return -1;
}
return 0;
}
size_t ucx_buffer_write(const void *ptr, size_t size, size_t nitems,
UcxBuffer *buffer) {
size_t len = size * nitems;
size_t required = buffer->pos + len;
if (buffer->pos > required) {
return 0;
}
if (required > buffer->capacity) {
if ((buffer->flags & UCX_BUFFER_AUTOEXTEND) == UCX_BUFFER_AUTOEXTEND) {
if (ucx_buffer_extend(buffer, required - buffer->capacity)) {
return 0;
}
} else {
len = buffer->capacity - buffer->pos;
if (size > 1) {
len -= len%size;
}
}
}
if (len == 0) {
return len;
}
memcpy(buffer->space + buffer->pos, ptr, len);
buffer->pos += len;
if(buffer->pos > buffer->size) {
buffer->size = buffer->pos;
}
return len / size;
}
size_t ucx_buffer_read(void *ptr, size_t size, size_t nitems,
UcxBuffer *buffer) {
size_t len = size * nitems;
if (buffer->pos + len > buffer->size) {
len = buffer->size - buffer->pos;
if (size > 1) len -= len%size;
}
if (len <= 0) {
return len;
}
memcpy(ptr, buffer->space + buffer->pos, len);
buffer->pos += len;
return len / size;
}
int ucx_buffer_putc(UcxBuffer *buffer, int c) {
if(buffer->pos >= buffer->capacity) {
if ((buffer->flags & UCX_BUFFER_AUTOEXTEND) == UCX_BUFFER_AUTOEXTEND) {
if(ucx_buffer_extend(buffer, 1)) {
return EOF;
}
} else {
return EOF;
}
}
c &= 0xFF;
buffer->space[buffer->pos] = (char) c;
buffer->pos++;
if(buffer->pos > buffer->size) {
buffer->size = buffer->pos;
}
return c;
}
int ucx_buffer_getc(UcxBuffer *buffer) {
if (ucx_buffer_eof(buffer)) {
return EOF;
} else {
int c = buffer->space[buffer->pos];
buffer->pos++;
return c;
}
}
size_t ucx_buffer_puts(UcxBuffer *buffer, char *str) {
return ucx_buffer_write((const void*)str, 1, strlen(str), buffer);
}