GNUnet  0.20.0
crypto_hash_file.c File Reference

incremental hashing of files More...

#include "platform.h"
#include "gnunet_util_lib.h"
#include <gcrypt.h>
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Data Structures

struct  GNUNET_CRYPTO_FileHashContext
 Context used when hashing a file. More...


#define LOG(kind, ...)
#define LOG_STRERROR_FILE(kind, syscall, filename)


static void file_hash_finish (struct GNUNET_CRYPTO_FileHashContext *fhc, const struct GNUNET_HashCode *res)
 Report result of hash computation to callback and free associated resources. More...
static void file_hash_task (void *cls)
 File hashing task. More...
struct GNUNET_CRYPTO_FileHashContextGNUNET_CRYPTO_hash_file (enum GNUNET_SCHEDULER_Priority priority, const char *filename, size_t blocksize, GNUNET_CRYPTO_HashCompletedCallback callback, void *callback_cls)
 Compute the hash of an entire file. More...
void GNUNET_CRYPTO_hash_file_cancel (struct GNUNET_CRYPTO_FileHashContext *fhc)
 Cancel a file hashing operation. More...

Detailed Description

incremental hashing of files

Christian Grothoff

Definition in file crypto_hash_file.c.

Macro Definition Documentation


#define LOG (   kind,
GNUNET_log_from (kind, "util-crypto-hash-file", \
#define GNUNET_log_from(kind, comp,...)

Definition at line 31 of file crypto_hash_file.c.


#define LOG_STRERROR_FILE (   kind,
"util-crypto-hash-file", \
syscall, \
static char * filename
#define GNUNET_log_from_strerror_file(level, component, cmd, filename)
Log an error message at log-level 'level' that indicates a failure of the command 'cmd' with the mess...

Definition at line 34 of file crypto_hash_file.c.

Function Documentation

◆ file_hash_finish()

static void file_hash_finish ( struct GNUNET_CRYPTO_FileHashContext fhc,
const struct GNUNET_HashCode res 

Report result of hash computation to callback and free associated resources.

Definition at line 108 of file crypto_hash_file.c.

110 {
111  fhc->callback (fhc->callback_cls, res);
112  GNUNET_free (fhc->filename);
113  if (! GNUNET_DISK_handle_invalid (fhc->fh))
115  gcry_md_close (fhc->md);
116  GNUNET_free (fhc); /* also frees fhc->buffer */
117 }
static int res
enum GNUNET_GenericReturnValue GNUNET_DISK_handle_invalid(const struct GNUNET_DISK_FileHandle *h)
Checks whether a handle is invalid.
Definition: disk.c:185
enum GNUNET_GenericReturnValue GNUNET_DISK_file_close(struct GNUNET_DISK_FileHandle *h)
Close an open file.
Definition: disk.c:1308
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur.
#define GNUNET_free(ptr)
Wrapper around free.
gcry_md_hd_t md
Cummulated hash.
GNUNET_CRYPTO_HashCompletedCallback callback
Function to call upon completion.
struct GNUNET_DISK_FileHandle * fh
File descriptor.
void * callback_cls
Closure for callback.
char * filename
Name of the file we are hashing.

References GNUNET_CRYPTO_FileHashContext::callback, GNUNET_CRYPTO_FileHashContext::callback_cls, GNUNET_CRYPTO_FileHashContext::fh, GNUNET_CRYPTO_FileHashContext::filename, GNUNET_break, GNUNET_DISK_file_close(), GNUNET_DISK_handle_invalid(), GNUNET_free, GNUNET_OK, GNUNET_CRYPTO_FileHashContext::md, and res.

Referenced by file_hash_task().

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◆ file_hash_task()

static void file_hash_task ( void *  cls)

File hashing task.


Definition at line 126 of file crypto_hash_file.c.

127 {
128  struct GNUNET_CRYPTO_FileHashContext *fhc = cls;
129  struct GNUNET_HashCode *res;
130  size_t delta;
131  ssize_t sret;
133  fhc->task = NULL;
134  GNUNET_assert (fhc->offset <= fhc->fsize);
135  delta = fhc->bsize;
136  if (fhc->fsize - fhc->offset < delta)
137  delta = fhc->fsize - fhc->offset;
138  sret = GNUNET_DISK_file_read (fhc->fh,
139  fhc->buffer,
140  delta);
141  if ((sret < 0) ||
142  (delta != (size_t) sret))
143  {
145  "read",
146  fhc->filename);
147  file_hash_finish (fhc,
148  NULL);
149  return;
150  }
151  gcry_md_write (fhc->md,
152  fhc->buffer,
153  delta);
154  fhc->offset += delta;
155  if (fhc->offset == fhc->fsize)
156  {
157  res = (struct GNUNET_HashCode *) gcry_md_read (fhc->md,
158  GCRY_MD_SHA512);
159  file_hash_finish (fhc, res);
160  return;
161  }
164  fhc);
165 }
static void file_hash_task(void *cls)
File hashing task.
static void file_hash_finish(struct GNUNET_CRYPTO_FileHashContext *fhc, const struct GNUNET_HashCode *res)
Report result of hash computation to callback and free associated resources.
#define LOG_STRERROR_FILE(kind, syscall, filename)
ssize_t GNUNET_DISK_file_read(const struct GNUNET_DISK_FileHandle *h, void *result, size_t len)
Read the contents of a binary file into a buffer.
Definition: disk.c:622
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_with_priority(enum GNUNET_SCHEDULER_Priority prio, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run with a specified priority.
Definition: scheduler.c:1226
static struct GNUNET_TIME_Relative delta
Definition: speedup.c:36
Context used when hashing a file.
uint64_t fsize
Size of the file.
unsigned char * buffer
IO buffer.
uint64_t offset
Current offset.
struct GNUNET_SCHEDULER_Task * task
Current task for hashing.
enum GNUNET_SCHEDULER_Priority priority
Priority we use.
A 512-bit hashcode.

References GNUNET_CRYPTO_FileHashContext::bsize, GNUNET_CRYPTO_FileHashContext::buffer, delta, GNUNET_CRYPTO_FileHashContext::fh, file_hash_finish(), GNUNET_CRYPTO_FileHashContext::filename, GNUNET_CRYPTO_FileHashContext::fsize, GNUNET_assert, GNUNET_DISK_file_read(), GNUNET_ERROR_TYPE_WARNING, GNUNET_SCHEDULER_add_with_priority(), LOG_STRERROR_FILE, GNUNET_CRYPTO_FileHashContext::md, GNUNET_CRYPTO_FileHashContext::offset, GNUNET_CRYPTO_FileHashContext::priority, res, and GNUNET_CRYPTO_FileHashContext::task.

Referenced by GNUNET_CRYPTO_hash_file().

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