2 * Copyright (c) 1997 - 2000, 2002 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
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34 #include "krb5_locl.h"
35 #include "store-int.h"
37 typedef struct mem_storage{
44 mem_fetch(krb5_storage *sp, void *data, size_t size)
46 mem_storage *s = (mem_storage*)sp->data;
47 if(size > (size_t)(s->base + s->size - s->ptr))
48 size = s->base + s->size - s->ptr;
49 memmove(data, s->ptr, size);
50 sp->seek(sp, size, SEEK_CUR);
55 mem_store(krb5_storage *sp, const void *data, size_t size)
57 mem_storage *s = (mem_storage*)sp->data;
58 if(size > (size_t)(s->base + s->size - s->ptr))
59 size = s->base + s->size - s->ptr;
60 memmove(s->ptr, data, size);
61 sp->seek(sp, size, SEEK_CUR);
66 mem_no_store(krb5_storage *sp, const void *data, size_t size)
72 mem_seek(krb5_storage *sp, off_t offset, int whence)
74 mem_storage *s = (mem_storage*)sp->data;
77 if((size_t)offset > s->size)
81 s->ptr = s->base + offset;
84 return sp->seek(sp, s->ptr - s->base + offset, SEEK_SET);
86 return sp->seek(sp, s->size + offset, SEEK_SET);
91 return s->ptr - s->base;
95 mem_trunc(krb5_storage *sp, off_t offset)
97 mem_storage *s = (mem_storage*)sp->data;
98 if((size_t)offset > s->size)
101 if ((s->ptr - s->base) > offset)
102 s->ptr = s->base + offset;
107 mem_no_trunc(krb5_storage *sp, off_t offset)
113 * Create a fixed size memory storage block
115 * @return A krb5_storage on success, or NULL on out of memory error.
117 * @ingroup krb5_storage
119 * @sa krb5_storage_mem()
120 * @sa krb5_storage_from_readonly_mem()
121 * @sa krb5_storage_from_data()
122 * @sa krb5_storage_from_fd()
125 KRB5_LIB_FUNCTION krb5_storage * KRB5_LIB_CALL
126 krb5_storage_from_mem(void *buf, size_t len)
128 krb5_storage *sp = malloc(sizeof(krb5_storage));
132 s = malloc(sizeof(*s));
139 sp->eof_code = HEIM_ERR_EOF;
143 sp->fetch = mem_fetch;
144 sp->store = mem_store;
146 sp->trunc = mem_trunc;
148 sp->max_alloc = UINT_MAX/8;
153 * Create a fixed size memory storage block
155 * @return A krb5_storage on success, or NULL on out of memory error.
157 * @ingroup krb5_storage
159 * @sa krb5_storage_mem()
160 * @sa krb5_storage_from_mem()
161 * @sa krb5_storage_from_readonly_mem()
162 * @sa krb5_storage_from_fd()
165 KRB5_LIB_FUNCTION krb5_storage * KRB5_LIB_CALL
166 krb5_storage_from_data(krb5_data *data)
168 return krb5_storage_from_mem(data->data, data->length);
172 * Create a fixed size memory storage block that is read only
174 * @return A krb5_storage on success, or NULL on out of memory error.
176 * @ingroup krb5_storage
178 * @sa krb5_storage_mem()
179 * @sa krb5_storage_from_mem()
180 * @sa krb5_storage_from_data()
181 * @sa krb5_storage_from_fd()
184 KRB5_LIB_FUNCTION krb5_storage * KRB5_LIB_CALL
185 krb5_storage_from_readonly_mem(const void *buf, size_t len)
187 krb5_storage *sp = malloc(sizeof(krb5_storage));
191 s = malloc(sizeof(*s));
198 sp->eof_code = HEIM_ERR_EOF;
199 s->base = rk_UNCONST(buf);
201 s->ptr = rk_UNCONST(buf);
202 sp->fetch = mem_fetch;
203 sp->store = mem_no_store;
205 sp->trunc = mem_no_trunc;
207 sp->max_alloc = UINT_MAX/8;