ucx: ucx/buffer.c@655020a30e77

     1 #include "buffer.h"

     2 #include <stdarg.h>

     3 #include <stdlib.h>

     4 #include <string.h>

     6 UcxBuffer *ucx_buffer_new(void *space, size_t size, int flags) {

     7     UcxBuffer *buffer = (UcxBuffer*) malloc(sizeof(UcxBuffer));

     8     if (buffer) {

     9         buffer->flags = flags;

    10         if (!space) {

    11             buffer->space = malloc(size);

    12             if (!buffer->space) {

    13                 free(buffer);

    14                 return NULL;

    15             }

    16             memset(buffer->space, 0, size);

    17             buffer->flags |= UCX_BUFFER_AUTOFREE;

    18         } else {

    19             buffer->space = space;

    20         }

    21         buffer->capacity = size;

    22         buffer->size = 0;

    24         buffer->pos = 0;

    25     }

    27     return buffer;

    28 }

    30 void ucx_buffer_free(UcxBuffer *buffer) {

    31     if ((buffer->flags & UCX_BUFFER_AUTOFREE) == UCX_BUFFER_AUTOFREE) {

    32         free(buffer->space);

    33     }

    34     free(buffer);

    35 }

    37 UcxBuffer* ucx_buffer_extract(

    38         UcxBuffer *src, size_t start, size_t length, int flags) {

    39     if(src->size == 0) {

    40         return NULL;

    41     }

    42     if (length == 0) {

    43         length = src->size - start;

    44     }

    45     if (start+length > src->size) {

    46         return NULL;

    47     }

    49     UcxBuffer *dst = (UcxBuffer*) malloc(sizeof(UcxBuffer));

    50     if (dst) {

    51         dst->space = malloc(length);

    52         if (!dst->space) {

    53             free(dst);

    54             return NULL;

    55         }

    56         dst->capacity = length;

    57         dst->size = length;

    58         dst->flags = flags | UCX_BUFFER_AUTOFREE;

    59         dst->pos = 0;

    60         memcpy(dst->space, src->space+start, length);

    61     }

    62     return dst;

    63 }

    65 int ucx_buffer_seek(UcxBuffer *buffer, off_t offset, int whence) {

    66     off_t npos;

    67     switch (whence) {

    68     case SEEK_SET:

    69         npos = 0;

    70         break;

    71     case SEEK_CUR:

    72         npos = buffer->pos;

    73         break;

    74     case SEEK_END:

    75         npos = buffer->size;

    76         break;

    77     }

    79     npos += offset;

    81     if (npos < 0 || npos > buffer->size) {

    82         return -1;

    83     } else {

    84         buffer->pos = npos;

    85         return 0;

    86     }

    88 }

    90 int ucx_buffer_eof(UcxBuffer *buffer) {

    91     return buffer->pos >= buffer->size;

    92 }

    94 int ucx_buffer_extend(UcxBuffer *buffer, size_t len) {

    95     size_t newcap = buffer->capacity;

    96     while (buffer->pos + len > newcap) newcap <<= 1;

    98     char *newspace = realloc(buffer->space, newcap);

    99     if (newspace) {

   100         memset(newspace+buffer->size, 0, newcap-buffer->size);

   101         buffer->space = newspace;

   102         buffer->capacity = newcap;

   103     } else {

   104         return -1;

   105     }

   107     return 0;

   108 }

   110 size_t ucx_buffer_write(const void *ptr, size_t size, size_t nitems,

   111         UcxBuffer *buffer) {

   112     size_t len = size * nitems;

   113     if (buffer->pos + len > buffer->capacity) {

   114         if ((buffer->flags & UCX_BUFFER_AUTOEXTEND) == UCX_BUFFER_AUTOEXTEND) {

   115             if(ucx_buffer_extend(buffer, len)) {

   116                 return -1;

   117             }

   118         } else {

   119             len = buffer->capacity - buffer->pos;

   120             if (size > 1) len -= len%size;

   121         }

   122     }

   124     if (len <= 0) {

   125         return len;

   126     }

   128     memcpy(buffer->space + buffer->pos, ptr, len);

   129     buffer->pos += len;

   130     if(buffer->pos > buffer->size) {

   131         buffer->size = buffer->pos;

   132     }

   134     return len / size;

   135 }

   137 size_t ucx_buffer_read(void *ptr, size_t size, size_t nitems,

   138         UcxBuffer *buffer) {

   139     size_t len = size * nitems;

   140     if (buffer->pos + len > buffer->size) {

   141         len = buffer->size - buffer->pos;

   142         if (size > 1) len -= len%size;

   143     }

   145     if (len <= 0) {

   146         return len;

   147     }

   149     memcpy(ptr, buffer->space + buffer->pos, len);

   150     buffer->pos += len;

   152     return len / size;

   153 }

   155 int ucx_buffer_putc(UcxBuffer *buffer, int c) {

   156     if(buffer->pos >= buffer->capacity) {

   157         if ((buffer->flags & UCX_BUFFER_AUTOEXTEND) == UCX_BUFFER_AUTOEXTEND) {

   158             if(ucx_buffer_extend(buffer, 1)) {

   159                 return EOF;

   160             }

   161         } else {

   162             return EOF;

   163         }

   164     }

   166     c &= 0xFF;

   167     buffer->space[buffer->pos] = (char) c;

   168     buffer->pos++;

   169     if(buffer->pos > buffer->size) {

   170         buffer->size = buffer->pos;

   171     }

   172     return c;

   173 }

   175 int ucx_buffer_getc(UcxBuffer *buffer) {

   176     if (ucx_buffer_eof(buffer)) {

   177         return EOF;

   178     } else {

   179         int c = buffer->space[buffer->pos];

   180         buffer->pos++;

   181         return c;

   182     }

   183 }

   185 size_t ucx_buffer_generic_copy(void *s1, void *s2,

   186         read_func readfnc, write_func writefnc, size_t bufsize) {

   187     size_t ncp = 0;

   188     char *buf = malloc(bufsize);

   189     if(buf == NULL) {

   190         return 0;

   191     }

   193     size_t r;

   194     while((r = readfnc(buf, 1, bufsize, s1)) != 0) {

   195         r = writefnc(buf, 1, r, s2);

   196         ncp += r;

   197         if(r == 0) {

   198             break;

   199         }

   200     }

   202     free(buf);

   203     return ncp;

   204 }

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