ucx: ucx/buffer.c@b7d1317b138e (annotated)

ucx/buffer.c@b7d1317b138e (annotated)

ucx/buffer.c

Tue, 17 Oct 2017 15:15:54 +0200

author: Mike Becker <universe@uap-core.de>
date: Tue, 17 Oct 2017 15:15:54 +0200
changeset 250: b7d1317b138e
parent 239: 1634c3ea89da
permissions: -rw-r--r--

updates license

 /*
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
  *
  * Copyright 2017 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 ||
         ((size_t)-1) - start < length || 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);
 }

Mercurial > hg > ucx / annotate

ucx/buffer.c@b7d1317b138e (annotated)

ucx/buffer.c