2e846c7099
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@1359 ec53bebd-3082-4978-b11e-865c3cabbd6b
74 lines
1.5 KiB
C
74 lines
1.5 KiB
C
#include "krb5_locl.h"
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RCSID("$Id$");
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typedef struct mem_storage{
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unsigned char *base;
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size_t size;
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unsigned char *ptr;
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}mem_storage;
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static size_t
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mem_fetch(krb5_storage *sp, void *data, size_t size)
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{
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mem_storage *s = (mem_storage*)sp->data;
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if(size > s->base + s->size - s->ptr)
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size = s->base + s->size - s->ptr;
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memmove(data, s->ptr, size);
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sp->seek(sp, size, SEEK_CUR);
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return size;
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}
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size_t
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mem_store(krb5_storage *sp, void *data, size_t size)
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{
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mem_storage *s = (mem_storage*)sp->data;
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if(size > s->base + s->size - s->ptr)
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size = s->base + s->size - s->ptr;
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memmove(s->ptr, data, size);
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sp->seek(sp, size, SEEK_CUR);
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return size;
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}
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off_t
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mem_seek(krb5_storage *sp, off_t offset, int whence)
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{
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mem_storage *s = (mem_storage*)sp->data;
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switch(whence){
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case SEEK_SET:
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if(offset > s->size)
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offset = s->size;
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if(offset < 0)
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offset = 0;
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s->ptr = s->base + offset;
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break;
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case SEEK_CUR:
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sp->seek(sp, s->ptr - s->base + offset, SEEK_SET);
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break;
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case SEEK_END:
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sp->seek(sp, s->size + offset, SEEK_SET);
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default:
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errno = EINVAL;
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return -1;
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}
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return s->ptr - s->base;
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}
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krb5_storage *
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krb5_storage_from_mem(void *buf, size_t len)
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{
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krb5_storage *sp = malloc(sizeof(krb5_storage));
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mem_storage *s = malloc(sizeof(*s));
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sp->data = s;
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s->base = buf;
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s->size = len;
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s->ptr = buf;
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sp->fetch = mem_fetch;
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sp->store = mem_store;
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sp->seek = mem_seek;
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sp->free = NULL;
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return sp;
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}
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