comparison: ucx/buffer.c
ucx/buffer.c
- changeset 1
- 1bcaac272cdf
- child 5
- 88625853ae74
equal
deleted
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replaced
| 0:0f94d369bb02 | 1:1bcaac272cdf |
|---|---|
| 1 #include "buffer.h" | |
| 2 #include <stdarg.h> | |
| 3 #include <stdlib.h> | |
| 4 #include <string.h> | |
| 5 | |
| 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; | |
| 23 | |
| 24 buffer->pos = 0; | |
| 25 } | |
| 26 | |
| 27 return buffer; | |
| 28 } | |
| 29 | |
| 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 } | |
| 36 | |
| 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 } | |
| 48 | |
| 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 } | |
| 64 | |
| 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 } | |
| 78 | |
| 79 npos += offset; | |
| 80 | |
| 81 if (npos < 0 || npos > buffer->size) { | |
| 82 return -1; | |
| 83 } else { | |
| 84 buffer->pos = npos; | |
| 85 return 0; | |
| 86 } | |
| 87 | |
| 88 } | |
| 89 | |
| 90 int ucx_buffer_eof(UcxBuffer *buffer) { | |
| 91 return buffer->pos >= buffer->size; | |
| 92 } | |
| 93 | |
| 94 int ucx_buffer_extend(UcxBuffer *buffer, size_t len) { | |
| 95 size_t newcap = buffer->capacity; | |
| 96 while (buffer->pos + len > newcap) newcap <<= 1; | |
| 97 | |
| 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 } | |
| 106 | |
| 107 return 0; | |
| 108 } | |
| 109 | |
| 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 } | |
| 123 | |
| 124 if (len <= 0) { | |
| 125 return len; | |
| 126 } | |
| 127 | |
| 128 memcpy(buffer->space + buffer->pos, ptr, len); | |
| 129 buffer->pos += len; | |
| 130 if(buffer->pos > buffer->size) { | |
| 131 buffer->size = buffer->pos; | |
| 132 } | |
| 133 | |
| 134 return len / size; | |
| 135 } | |
| 136 | |
| 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 } | |
| 144 | |
| 145 if (len <= 0) { | |
| 146 return len; | |
| 147 } | |
| 148 | |
| 149 memcpy(ptr, buffer->space + buffer->pos, len); | |
| 150 buffer->pos += len; | |
| 151 | |
| 152 return len / size; | |
| 153 } | |
| 154 | |
| 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 } | |
| 165 | |
| 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 } | |
| 174 | |
| 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 } | |
| 184 | |
| 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 } | |
| 192 | |
| 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 } | |
| 201 | |
| 202 free(buf); | |
| 203 return ncp; | |
| 204 } |
