ucx: ucx/buffer.c@af355652f271 (annotated)

ucx/buffer.c@af355652f271 (annotated)

ucx/buffer.c

Wed, 06 Feb 2013 12:55:56 +0100

author: Olaf Wintermann <olaf.wintermann@gmail.com>
date: Wed, 06 Feb 2013 12:55:56 +0100
changeset 78: af355652f271
parent 76: 655020a30e77
child 84: 7465c18765dc
permissions: -rw-r--r--

some fixes

 #include "buffer.h"
 #include <stdarg.h>
 #include <stdlib.h>
 #include <string.h>
 UcxBuffer *ucx_buffer_new(void *space, size_t size, int flags) {
     UcxBuffer *buffer = (UcxBuffer*) malloc(sizeof(UcxBuffer));
     if (buffer) {
         buffer->flags = flags;
         if (!space) {
             buffer->space = (char*)malloc(size);
             if (!buffer->space) {
                 free(buffer);
                 return NULL;
             }
             memset(buffer->space, 0, size);
             buffer->flags |= UCX_BUFFER_AUTOFREE;
         } else {
             buffer->space = (char*)space;
         }
         buffer->capacity = size;
         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) {
         return NULL;
     }
     if (length == 0) {
         length = src->size - start;
     }
     if (start+length > src->size) {
         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) {
     off_t npos;
     switch (whence) {
     case SEEK_SET:
         npos = 0;
         break;
     case SEEK_CUR:
         npos = buffer->pos;
         break;
     case SEEK_END:
         npos = buffer->size;
         break;
     }
     npos += offset;
     if (npos < 0 || 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;
     while (buffer->pos + len > newcap) newcap <<= 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;
     if (buffer->pos + len > buffer->capacity) {
         if ((buffer->flags & UCX_BUFFER_AUTOEXTEND) == UCX_BUFFER_AUTOEXTEND) {
             if(ucx_buffer_extend(buffer, len)) {
                 return -1;
             }
         } 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_generic_copy(void *s1, void *s2,
         read_func readfnc, write_func writefnc, size_t bufsize) {
     size_t ncp = 0;
     char *buf = (char*)malloc(bufsize);
     if(buf == NULL) {
         return 0;
     }
     size_t r;
     while((r = readfnc(buf, 1, bufsize, s1)) != 0) {
         r = writefnc(buf, 1, r, s2);
         ncp += r;
         if(r == 0) {
             break;
         }
     }
     free(buf);
     return ncp;
 }

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ucx/buffer.c@af355652f271 (annotated)

ucx/buffer.c