Lines Matching defs:blob
26 #include "blob.h"
39 /* Ensure that \blob will be able to fit an additional object of size
44 grow_to_fit(struct blob *blob, size_t additional)
49 if (blob->out_of_memory)
52 if (blob->size + additional <= blob->allocated)
55 if (blob->fixed_allocation) {
56 blob->out_of_memory = true;
60 if (blob->allocated == 0)
63 to_allocate = blob->allocated * 2;
65 to_allocate = MAX2(to_allocate, blob->allocated + additional);
67 new_data = realloc(blob->data, to_allocate);
69 blob->out_of_memory = true;
73 blob->data = new_data;
74 blob->allocated = to_allocate;
79 /* Align the blob->size so that reading or writing a value at (blob->data +
80 * blob->size) will result in an access aligned to a granularity of \alignment
86 blob_align(struct blob *blob, size_t alignment)
88 const size_t new_size = align64(blob->size, alignment);
90 if (blob->size < new_size) {
91 if (!grow_to_fit(blob, new_size - blob->size))
94 if (blob->data)
95 memset(blob->data + blob->size, 0, new_size - blob->size);
96 blob->size = new_size;
103 blob_reader_align(struct blob_reader *blob, size_t alignment)
105 blob->current = blob->data + align64(blob->current - blob->data, alignment);
109 blob_init(struct blob *blob)
111 blob->data = NULL;
112 blob->allocated = 0;
113 blob->size = 0;
114 blob->fixed_allocation = false;
115 blob->out_of_memory = false;
119 blob_init_fixed(struct blob *blob, void *data, size_t size)
121 blob->data = data;
122 blob->allocated = size;
123 blob->size = 0;
124 blob->fixed_allocation = true;
125 blob->out_of_memory = false;
129 blob_finish_get_buffer(struct blob *blob, void **buffer, size_t *size)
131 *buffer = blob->data;
132 *size = blob->size;
133 blob->data = NULL;
140 blob_overwrite_bytes(struct blob *blob,
146 if (offset + to_write < offset || blob->size < offset + to_write)
151 if (blob->data)
152 memcpy(blob->data + offset, bytes, to_write);
158 blob_write_bytes(struct blob *blob, const void *bytes, size_t to_write)
160 if (! grow_to_fit(blob, to_write))
165 if (blob->data && to_write > 0)
166 memcpy(blob->data + blob->size, bytes, to_write);
167 blob->size += to_write;
173 blob_reserve_bytes(struct blob *blob, size_t to_write)
177 if (! grow_to_fit (blob, to_write))
180 ret = blob->size;
181 blob->size += to_write;
187 blob_reserve_uint32(struct blob *blob)
189 blob_align(blob, sizeof(uint32_t));
190 return blob_reserve_bytes(blob, sizeof(uint32_t));
194 blob_reserve_intptr(struct blob *blob)
196 blob_align(blob, sizeof(intptr_t));
197 return blob_reserve_bytes(blob, sizeof(intptr_t));
202 name(struct blob *blob, type value) \
204 blob_align(blob, sizeof(value)); \
205 return blob_write_bytes(blob, &value, sizeof(value)); \
218 blob_overwrite_uint8 (struct blob *blob,
223 return blob_overwrite_bytes(blob, offset, &value, sizeof(value));
227 blob_overwrite_uint32 (struct blob *blob,
232 return blob_overwrite_bytes(blob, offset, &value, sizeof(value));
236 blob_overwrite_intptr (struct blob *blob,
241 return blob_overwrite_bytes(blob, offset, &value, sizeof(value));
245 blob_write_string(struct blob *blob, const char *str)
247 return blob_write_bytes(blob, str, strlen(str) + 1);
251 blob_reader_init(struct blob_reader *blob, const void *data, size_t size)
253 blob->data = data;
254 blob->end = blob->data + size;
255 blob->current = data;
256 blob->overrun = false;
259 /* Check that an object of size \size can be read from this blob.
261 * If not, set blob->overrun to indicate that we attempted to read too far.
264 ensure_can_read(struct blob_reader *blob, size_t size)
266 if (blob->overrun)
269 if (blob->current <= blob->end && blob->end - blob->current >= size)
272 blob->overrun = true;
278 blob_read_bytes(struct blob_reader *blob, size_t size)
282 if (! ensure_can_read (blob, size))
285 ret = blob->current;
287 blob->current += size;
293 blob_copy_bytes(struct blob_reader *blob, void *dest, size_t size)
297 bytes = blob_read_bytes(blob, size);
305 blob_skip_bytes(struct blob_reader *blob, size_t size)
307 if (ensure_can_read (blob, size))
308 blob->current += size;
313 name(struct blob_reader *blob) \
317 blob_reader_align(blob, size); \
318 blob_copy_bytes(blob, &ret, size); \
329 blob_read_string(struct blob_reader *blob)
336 if (blob->current >= blob->end) {
337 blob->overrun = true;
341 /* Similarly, if there is no zero byte in the data remaining in this blob,
344 nul = memchr(blob->current, 0, blob->end - blob->current);
347 blob->overrun = true;
351 size = nul - blob->current + 1;
353 assert(ensure_can_read(blob, size));
355 ret = (char *) blob->current;
357 blob->current += size;