author | Tero Marttila <terom@fixme.fi> |
Mon, 28 Dec 2009 22:31:33 +0200 | |
changeset 6 | 766df7c9b90d |
parent 4 | 49362b34116c |
child 7 | 997906f5fd2d |
permissions | -rw-r--r-- |
0 | 1 |
#include "cache.h" |
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#include "shared/util.h" |
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#include "shared/log.h" // only LOG_DEBUG |
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#include <stdlib.h> |
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#include <unistd.h> |
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#include <sys/types.h> |
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#include <sys/stat.h> |
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#include <fcntl.h> |
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#include <sys/mman.h> |
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#include <errno.h> |
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#include <assert.h> |
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static int pt_cache_new (struct pt_cache **cache_ptr, const char *path, int mode) |
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{ |
18 |
struct pt_cache *cache; |
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||
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// alloc |
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if ((cache = calloc(1, sizeof(*cache))) == NULL) |
22 |
return -1; |
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if ((cache->path = strdup(path)) == NULL) |
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goto error; |
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26 |
|
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// init |
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cache->fd = -1; |
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cache->mode = mode; |
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|
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31 |
// ok |
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*cache_ptr = cache; |
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|
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34 |
return 0; |
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|
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error: |
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37 |
// cleanup |
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38 |
if (cache) |
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pt_cache_destroy(cache); |
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|
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return -1; |
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42 |
} |
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44 |
int pt_cache_open (struct pt_cache **cache_ptr, const char *path, int mode) |
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45 |
{ |
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struct pt_cache *cache; |
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// alloc |
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if (pt_cache_new(&cache, path, mode)) |
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return -1; |
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// ok |
53 |
*cache_ptr = cache; |
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54 |
||
55 |
return 0; |
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56 |
} |
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||
2 | 58 |
int pt_cache_stale (struct pt_cache *cache, const char *img_path) |
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{ |
2 | 60 |
struct stat st_img, st_cache; |
61 |
||
62 |
// test original file |
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if (stat(img_path, &st_img) < 0) |
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64 |
return -1; |
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65 |
||
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// test cache file |
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if (stat(cache->path, &st_cache) < 0) { |
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// always stale if it doesn't exist yet |
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if (errno == ENOENT) |
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return 1; |
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else |
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72 |
return -1; |
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} |
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// compare mtime |
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return (st_img.st_mtime > st_cache.st_mtime); |
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} |
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/** |
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80 |
* Abort any incomplete open operation, cleaning up |
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*/ |
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82 |
static void pt_cache_abort (struct pt_cache *cache) |
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83 |
{ |
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if (cache->mmap != NULL) { |
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munmap(cache->mmap, cache->size); |
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86 |
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cache->mmap = NULL; |
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} |
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89 |
|
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90 |
if (cache->fd >= 0) { |
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close(cache->fd); |
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92 |
|
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93 |
cache->fd = -1; |
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} |
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95 |
} |
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96 |
|
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97 |
/** |
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98 |
* Open the cache file as an fd for reading |
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99 |
* |
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100 |
* XXX: needs locking |
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101 |
*/ |
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102 |
static int pt_cache_open_read_fd (struct pt_cache *cache, int *fd_ptr) |
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103 |
{ |
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104 |
int fd; |
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105 |
|
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106 |
// actual open() |
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107 |
if ((fd = open(cache->path, O_RDONLY)) < 0) |
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108 |
return -1; |
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109 |
|
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110 |
// ok |
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111 |
*fd_ptr = fd; |
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112 |
|
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113 |
return 0; |
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114 |
} |
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115 |
|
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116 |
/** |
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117 |
* Open the .tmp cache file as an fd for writing |
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118 |
*/ |
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119 |
static int pt_cache_open_tmp_fd (struct pt_cache *cache, int *fd_ptr) |
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120 |
{ |
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121 |
int fd; |
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122 |
char tmp_path[1024]; |
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123 |
|
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124 |
// check mode |
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125 |
if (!(cache->mode & PT_IMG_WRITE)) { |
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126 |
errno = EPERM; |
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127 |
return -1; |
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128 |
} |
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129 |
|
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130 |
// get .tmp path |
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131 |
if (path_with_fext(cache->path, tmp_path, sizeof(tmp_path), ".tmp")) |
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132 |
return -1; |
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133 |
|
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134 |
// open for write, create |
49362b34116c
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135 |
// XXX: locking? |
49362b34116c
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|
136 |
if ((fd = open(tmp_path, O_RDWR | O_CREAT, 0644)) < 0) |
49362b34116c
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|
137 |
return -1; |
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open cache as .tmp, and rename to .cache when done
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|
138 |
|
49362b34116c
open cache as .tmp, and rename to .cache when done
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|
139 |
// ok |
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|
140 |
*fd_ptr = fd; |
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open cache as .tmp, and rename to .cache when done
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141 |
|
49362b34116c
open cache as .tmp, and rename to .cache when done
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|
142 |
return 0; |
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|
143 |
} |
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open cache as .tmp, and rename to .cache when done
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144 |
|
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open cache as .tmp, and rename to .cache when done
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145 |
|
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open cache as .tmp, and rename to .cache when done
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|
146 |
/** |
1
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|
147 |
* Mmap the opened cache file from offset PT_CACHE_PAGE, using the calculated size stored in cache->size |
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148 |
*/ |
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|
149 |
static int pt_cache_open_mmap (struct pt_cache *cache, void **addr_ptr) |
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|
150 |
{ |
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|
151 |
int prot = 0; |
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|
152 |
void *addr; |
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|
153 |
|
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|
154 |
// determine prot |
6
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|
155 |
prot |= PROT_READ; |
1
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|
156 |
|
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|
157 |
if (cache->mode & PT_IMG_WRITE) |
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|
158 |
prot |= PROT_WRITE; |
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|
159 |
|
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|
160 |
// perform mmap() from second page on |
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|
161 |
if ((addr = mmap(NULL, cache->size, prot, MAP_SHARED, cache->fd, PT_CACHE_PAGE)) == MAP_FAILED) |
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|
162 |
return -1; |
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|
163 |
|
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|
164 |
// ok |
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|
165 |
*addr_ptr = addr; |
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|
166 |
|
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|
167 |
return 0; |
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|
168 |
} |
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|
169 |
|
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|
170 |
/** |
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|
171 |
* Write out the cache header into the opened file |
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|
172 |
*/ |
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|
173 |
static int pt_cache_write_header (struct pt_cache *cache, const struct pt_cache_header *header) |
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|
174 |
{ |
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|
175 |
size_t len = sizeof(*header); |
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|
176 |
const char *buf = (const char *) header; |
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|
177 |
|
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|
178 |
// seek to start |
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|
179 |
if (lseek(cache->fd, 0, SEEK_SET) != 0) |
f3cde3db1fef
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|
180 |
return -1; |
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|
181 |
|
f3cde3db1fef
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|
182 |
// write out full header |
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|
183 |
while (len) { |
f3cde3db1fef
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|
184 |
ssize_t ret; |
f3cde3db1fef
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0
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changeset
|
185 |
|
f3cde3db1fef
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|
186 |
// try and write out the header |
f3cde3db1fef
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|
187 |
if ((ret = write(cache->fd, buf, len)) < 0) |
f3cde3db1fef
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|
188 |
return -1; |
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
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0
diff
changeset
|
189 |
|
f3cde3db1fef
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diff
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|
190 |
// update offset |
f3cde3db1fef
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|
191 |
buf += ret; |
f3cde3db1fef
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|
192 |
len -= ret; |
f3cde3db1fef
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0
diff
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|
193 |
} |
f3cde3db1fef
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0
diff
changeset
|
194 |
|
f3cde3db1fef
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|
195 |
// done |
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
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diff
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|
196 |
return 0; |
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
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0
diff
changeset
|
197 |
} |
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
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0
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changeset
|
198 |
|
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
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0
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|
199 |
/** |
4
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|
200 |
* Create a new .tmp cache file, open it, and write out the header. |
0 | 201 |
*/ |
1
f3cde3db1fef
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0
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changeset
|
202 |
static int pt_cache_open_create (struct pt_cache *cache, struct pt_cache_header *header) |
0 | 203 |
{ |
2 | 204 |
// no access |
205 |
if (!(cache->mode & PT_IMG_WRITE)) { |
|
206 |
errno = EPERM; |
|
207 |
return -1; |
|
208 |
} |
|
209 |
||
4
49362b34116c
open cache as .tmp, and rename to .cache when done
Tero Marttila <terom@fixme.fi>
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|
210 |
// open as .tmp |
6
766df7c9b90d
--force-update and store palette
Tero Marttila <terom@fixme.fi>
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diff
changeset
|
211 |
if (pt_cache_open_tmp_fd(cache, &cache->fd)) |
1
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
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0
diff
changeset
|
212 |
return -1; |
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
parents:
0
diff
changeset
|
213 |
|
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
parents:
0
diff
changeset
|
214 |
// calculate data size |
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
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0
diff
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|
215 |
cache->size = sizeof(*header) + header->height * header->row_bytes; |
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
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0
diff
changeset
|
216 |
|
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
parents:
0
diff
changeset
|
217 |
// grow file |
f3cde3db1fef
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diff
changeset
|
218 |
if (ftruncate(cache->fd, PT_CACHE_PAGE + cache->size) < 0) |
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
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0
diff
changeset
|
219 |
goto error; |
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
parents:
0
diff
changeset
|
220 |
|
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
parents:
0
diff
changeset
|
221 |
// open mmap |
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
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0
diff
changeset
|
222 |
if (pt_cache_open_mmap(cache, (void **) &cache->mmap)) |
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
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0
diff
changeset
|
223 |
goto error; |
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
parents:
0
diff
changeset
|
224 |
|
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
parents:
0
diff
changeset
|
225 |
// write header |
f3cde3db1fef
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0
diff
changeset
|
226 |
if (pt_cache_write_header(cache, header)) |
f3cde3db1fef
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0
diff
changeset
|
227 |
goto error; |
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
parents:
0
diff
changeset
|
228 |
|
f3cde3db1fef
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0
diff
changeset
|
229 |
// done |
f3cde3db1fef
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parents:
0
diff
changeset
|
230 |
return 0; |
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
parents:
0
diff
changeset
|
231 |
|
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
parents:
0
diff
changeset
|
232 |
error: |
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
parents:
0
diff
changeset
|
233 |
// cleanup |
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
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0
diff
changeset
|
234 |
pt_cache_abort(cache); |
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
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0
diff
changeset
|
235 |
|
f3cde3db1fef
basic image/cache code compiles
Tero Marttila <terom@fixme.fi>
parents:
0
diff
changeset
|
236 |
return -1; |
0 | 237 |
} |
238 |
||
4
49362b34116c
open cache as .tmp, and rename to .cache when done
Tero Marttila <terom@fixme.fi>
parents:
3
diff
changeset
|
239 |
/** |
49362b34116c
open cache as .tmp, and rename to .cache when done
Tero Marttila <terom@fixme.fi>
parents:
3
diff
changeset
|
240 |
* Rename the opened .tmp to .cache |
49362b34116c
open cache as .tmp, and rename to .cache when done
Tero Marttila <terom@fixme.fi>
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3
diff
changeset
|
241 |
*/ |
49362b34116c
open cache as .tmp, and rename to .cache when done
Tero Marttila <terom@fixme.fi>
parents:
3
diff
changeset
|
242 |
static int pt_cache_create_done (struct pt_cache *cache) |
49362b34116c
open cache as .tmp, and rename to .cache when done
Tero Marttila <terom@fixme.fi>
parents:
3
diff
changeset
|
243 |
{ |
49362b34116c
open cache as .tmp, and rename to .cache when done
Tero Marttila <terom@fixme.fi>
parents:
3
diff
changeset
|
244 |
char tmp_path[1024]; |
49362b34116c
open cache as .tmp, and rename to .cache when done
Tero Marttila <terom@fixme.fi>
parents:
3
diff
changeset
|
245 |
|
49362b34116c
open cache as .tmp, and rename to .cache when done
Tero Marttila <terom@fixme.fi>
parents:
3
diff
changeset
|
246 |
// get .tmp path |
49362b34116c
open cache as .tmp, and rename to .cache when done
Tero Marttila <terom@fixme.fi>
parents:
3
diff
changeset
|
247 |
if (path_with_fext(cache->path, tmp_path, sizeof(tmp_path), ".tmp")) |
49362b34116c
open cache as .tmp, and rename to .cache when done
Tero Marttila <terom@fixme.fi>
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3
diff
changeset
|
248 |
return -1; |
49362b34116c
open cache as .tmp, and rename to .cache when done
Tero Marttila <terom@fixme.fi>
parents:
3
diff
changeset
|
249 |
|
49362b34116c
open cache as .tmp, and rename to .cache when done
Tero Marttila <terom@fixme.fi>
parents:
3
diff
changeset
|
250 |
// rename |
49362b34116c
open cache as .tmp, and rename to .cache when done
Tero Marttila <terom@fixme.fi>
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3
diff
changeset
|
251 |
if (rename(tmp_path, cache->path) < 0) |
49362b34116c
open cache as .tmp, and rename to .cache when done
Tero Marttila <terom@fixme.fi>
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3
diff
changeset
|
252 |
return -1; |
49362b34116c
open cache as .tmp, and rename to .cache when done
Tero Marttila <terom@fixme.fi>
parents:
3
diff
changeset
|
253 |
|
49362b34116c
open cache as .tmp, and rename to .cache when done
Tero Marttila <terom@fixme.fi>
parents:
3
diff
changeset
|
254 |
// ok |
49362b34116c
open cache as .tmp, and rename to .cache when done
Tero Marttila <terom@fixme.fi>
parents:
3
diff
changeset
|
255 |
return 0; |
49362b34116c
open cache as .tmp, and rename to .cache when done
Tero Marttila <terom@fixme.fi>
parents:
3
diff
changeset
|
256 |
} |
49362b34116c
open cache as .tmp, and rename to .cache when done
Tero Marttila <terom@fixme.fi>
parents:
3
diff
changeset
|
257 |
|
0 | 258 |
int pt_cache_update_png (struct pt_cache *cache, png_structp png, png_infop info) |
259 |
{ |
|
260 |
struct pt_cache_header header; |
|
1
f3cde3db1fef
basic image/cache code compiles
Tero Marttila <terom@fixme.fi>
parents:
0
diff
changeset
|
261 |
|
f3cde3db1fef
basic image/cache code compiles
Tero Marttila <terom@fixme.fi>
parents:
0
diff
changeset
|
262 |
// XXX: check cache_mode |
f3cde3db1fef
basic image/cache code compiles
Tero Marttila <terom@fixme.fi>
parents:
0
diff
changeset
|
263 |
// XXX: check image doesn't use any options we don't handle |
0 | 264 |
|
265 |
memset(&header, 0, sizeof(header)); |
|
266 |
||
267 |
// fill in basic info |
|
1
f3cde3db1fef
basic image/cache code compiles
Tero Marttila <terom@fixme.fi>
parents:
0
diff
changeset
|
268 |
header.width = png_get_image_width(png, info); |
f3cde3db1fef
basic image/cache code compiles
Tero Marttila <terom@fixme.fi>
parents:
0
diff
changeset
|
269 |
header.height = png_get_image_height(png, info); |
f3cde3db1fef
basic image/cache code compiles
Tero Marttila <terom@fixme.fi>
parents:
0
diff
changeset
|
270 |
header.bit_depth = png_get_bit_depth(png, info); |
f3cde3db1fef
basic image/cache code compiles
Tero Marttila <terom@fixme.fi>
parents:
0
diff
changeset
|
271 |
header.color_type = png_get_color_type(png, info); |
0 | 272 |
|
6
766df7c9b90d
--force-update and store palette
Tero Marttila <terom@fixme.fi>
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4
diff
changeset
|
273 |
log_debug("width=%u, height=%u, bit_depth=%u, color_type=%u", |
766df7c9b90d
--force-update and store palette
Tero Marttila <terom@fixme.fi>
parents:
4
diff
changeset
|
274 |
header.width, header.height, header.bit_depth, header.color_type |
766df7c9b90d
--force-update and store palette
Tero Marttila <terom@fixme.fi>
parents:
4
diff
changeset
|
275 |
); |
766df7c9b90d
--force-update and store palette
Tero Marttila <terom@fixme.fi>
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4
diff
changeset
|
276 |
|
0 | 277 |
// fill in other info |
1
f3cde3db1fef
basic image/cache code compiles
Tero Marttila <terom@fixme.fi>
parents:
0
diff
changeset
|
278 |
header.row_bytes = png_get_rowbytes(png, info); |
f3cde3db1fef
basic image/cache code compiles
Tero Marttila <terom@fixme.fi>
parents:
0
diff
changeset
|
279 |
|
6
766df7c9b90d
--force-update and store palette
Tero Marttila <terom@fixme.fi>
parents:
4
diff
changeset
|
280 |
log_debug("row_bytes=%u", header.row_bytes); |
766df7c9b90d
--force-update and store palette
Tero Marttila <terom@fixme.fi>
parents:
4
diff
changeset
|
281 |
|
766df7c9b90d
--force-update and store palette
Tero Marttila <terom@fixme.fi>
parents:
4
diff
changeset
|
282 |
// palette etc. |
766df7c9b90d
--force-update and store palette
Tero Marttila <terom@fixme.fi>
parents:
4
diff
changeset
|
283 |
if (header.color_type == PNG_COLOR_TYPE_PALETTE) { |
766df7c9b90d
--force-update and store palette
Tero Marttila <terom@fixme.fi>
parents:
4
diff
changeset
|
284 |
int num_palette; |
766df7c9b90d
--force-update and store palette
Tero Marttila <terom@fixme.fi>
parents:
4
diff
changeset
|
285 |
png_colorp palette; |
766df7c9b90d
--force-update and store palette
Tero Marttila <terom@fixme.fi>
parents:
4
diff
changeset
|
286 |
|
766df7c9b90d
--force-update and store palette
Tero Marttila <terom@fixme.fi>
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287 |
if (png_get_PLTE(png, info, &palette, &num_palette) == 0) |
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288 |
// XXX: PLTE chunk not read? |
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289 |
return -1; |
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290 |
|
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291 |
assert(num_palette <= PNG_MAX_PALETTE_LENGTH); |
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292 |
|
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293 |
// copy |
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294 |
header.num_palette = num_palette; |
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295 |
memcpy(&header.palette, palette, num_palette * sizeof(*palette)); |
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296 |
|
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297 |
log_debug("num_palette=%u", num_palette); |
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298 |
} |
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299 |
|
4
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open cache as .tmp, and rename to .cache when done
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300 |
// create .tmp and write out header |
1
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301 |
if (pt_cache_open_create(cache, &header)) |
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302 |
return -1; |
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303 |
|
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304 |
// write out raw image data a row at a time |
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305 |
for (size_t row = 0; row < header.height; row++) { |
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306 |
// read row data, non-interlaced |
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307 |
png_read_row(png, cache->mmap + row * header.row_bytes, NULL); |
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308 |
} |
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309 |
|
4
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310 |
// move from .tmp to .cache |
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311 |
if (pt_cache_create_done(cache)) |
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312 |
return -1; |
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313 |
|
1
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314 |
// done! |
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315 |
return 0; |
0 | 316 |
} |
1
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|
317 |
|
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318 |
void pt_cache_destroy (struct pt_cache *cache) |
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319 |
{ |
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320 |
free(cache->path); |
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|
321 |
|
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322 |
pt_cache_abort(cache); |
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323 |
|
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324 |
free(cache); |
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325 |
} |