diff options
Diffstat (limited to 'libkdenetwork/libgpgme-copy/gpgme/data-mem.c')
| -rw-r--r-- | libkdenetwork/libgpgme-copy/gpgme/data-mem.c | 251 |
1 files changed, 251 insertions, 0 deletions
diff --git a/libkdenetwork/libgpgme-copy/gpgme/data-mem.c b/libkdenetwork/libgpgme-copy/gpgme/data-mem.c new file mode 100644 index 000000000..c76981166 --- /dev/null +++ b/libkdenetwork/libgpgme-copy/gpgme/data-mem.c @@ -0,0 +1,251 @@ +/* data-mem.c - A memory based data object. + Copyright (C) 2002, 2003, 2004 g10 Code GmbH + + This file is part of GPGME. + + GPGME is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as + published by the Free Software Foundation; either version 2.1 of + the License, or (at your option) any later version. + + GPGME is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA + 02111-1307, USA. */ + +#if HAVE_CONFIG_H +#include <config.h> +#endif + +#include <errno.h> +#include <stdlib.h> +#include <unistd.h> +#include <assert.h> +#include <string.h> + +#include "data.h" +#include "util.h" + + +static ssize_t +mem_read (gpgme_data_t dh, void *buffer, size_t size) +{ + size_t amt = dh->data.mem.length - dh->data.mem.offset; + const char *src; + + if (!amt) + return 0; + + if (size < amt) + amt = size; + + src = dh->data.mem.buffer ? dh->data.mem.buffer : dh->data.mem.orig_buffer; + memcpy (buffer, src + dh->data.mem.offset, amt); + dh->data.mem.offset += amt; + return amt; +} + + +static ssize_t +mem_write (gpgme_data_t dh, const void *buffer, size_t size) +{ + size_t unused; + + if (!dh->data.mem.buffer && dh->data.mem.orig_buffer) + { + size_t new_size = dh->data.mem.size; + char *new_buffer; + + if (new_size < dh->data.mem.offset + size) + new_size = dh->data.mem.offset + size; + + new_buffer = malloc (new_size); + if (!new_buffer) + return -1; + memcpy (new_buffer, dh->data.mem.orig_buffer, dh->data.mem.length); + + dh->data.mem.buffer = new_buffer; + dh->data.mem.size = new_size; + } + + unused = dh->data.mem.size - dh->data.mem.offset; + if (unused < size) + { + /* Allocate a large enough buffer with exponential backoff. */ +#define INITIAL_ALLOC 512 + size_t new_size = dh->data.mem.size + ? (2 * dh->data.mem.size) : INITIAL_ALLOC; + char *new_buffer; + + if (new_size < dh->data.mem.offset + size) + new_size = dh->data.mem.offset + size; + + new_buffer = realloc (dh->data.mem.buffer, new_size); + if (!new_buffer && new_size > dh->data.mem.offset + size) + { + /* Maybe we were too greedy, try again. */ + new_size = dh->data.mem.offset + size; + new_buffer = realloc (dh->data.mem.buffer, new_size); + } + if (!new_buffer) + return -1; + dh->data.mem.buffer = new_buffer; + dh->data.mem.size = new_size; + } + + memcpy (dh->data.mem.buffer + dh->data.mem.offset, buffer, size); + dh->data.mem.offset += size; + if (dh->data.mem.length < dh->data.mem.offset) + dh->data.mem.length = dh->data.mem.offset; + return size; +} + + +static off_t +mem_seek (gpgme_data_t dh, off_t offset, int whence) +{ + switch (whence) + { + case SEEK_SET: + if (offset < 0 || offset > dh->data.mem.length) + { + errno = EINVAL; + return -1; + } + dh->data.mem.offset = offset; + break; + case SEEK_CUR: + if ((offset > 0 && dh->data.mem.length - dh->data.mem.offset < offset) + || (offset < 0 && dh->data.mem.offset < -offset)) + { + errno = EINVAL; + return -1; + } + dh->data.mem.offset += offset; + break; + case SEEK_END: + if (offset > 0 || -offset > dh->data.mem.length) + { + errno = EINVAL; + return -1; + } + dh->data.mem.offset = dh->data.mem.length - offset; + break; + default: + errno = EINVAL; + return -1; + } + return dh->data.mem.offset; +} + + +static void +mem_release (gpgme_data_t dh) +{ + if (dh->data.mem.buffer) + free (dh->data.mem.buffer); +} + + +static struct _gpgme_data_cbs mem_cbs = + { + mem_read, + mem_write, + mem_seek, + mem_release, + NULL + }; + + +/* Create a new data buffer and return it in R_DH. */ +gpgme_error_t +gpgme_data_new (gpgme_data_t *dh) +{ + gpgme_error_t err = _gpgme_data_new (dh, &mem_cbs); + if (err) + return err; + + return 0; +} + + +/* Create a new data buffer filled with SIZE bytes starting from + BUFFER. If COPY is zero, copying is delayed until necessary, and + the data is taken from the original location when needed. */ +gpgme_error_t +gpgme_data_new_from_mem (gpgme_data_t *dh, const char *buffer, + size_t size, int copy) +{ + gpgme_error_t err = _gpgme_data_new (dh, &mem_cbs); + if (err) + return err; + + if (copy) + { + char *bufcpy = malloc (size); + if (!bufcpy) + _gpgme_data_release (*dh); + memcpy (bufcpy, buffer, size); + (*dh)->data.mem.buffer = bufcpy; + } + else + (*dh)->data.mem.orig_buffer = buffer; + + (*dh)->data.mem.size = size; + (*dh)->data.mem.length = size; + return 0; +} + + +/* Destroy the data buffer DH and return a pointer to its content. + The memory has be to released with gpgme_free() by the user. It's + size is returned in R_LEN. */ +char * +gpgme_data_release_and_get_mem (gpgme_data_t dh, size_t *r_len) +{ + char *str = NULL; + + if (!dh || dh->cbs != &mem_cbs) + { + gpgme_data_release (dh); + return NULL; + } + + str = dh->data.mem.buffer; + if (!str && dh->data.mem.orig_buffer) + { + str = malloc (dh->data.mem.length); + if (!str) + { + gpgme_data_release (dh); + return NULL; + } + memcpy (str, dh->data.mem.orig_buffer, dh->data.mem.length); + } + else + /* Prevent mem_release from releasing the buffer memory. We must + not fail from this point. */ + dh->data.mem.buffer = NULL; + + if (r_len) + *r_len = dh->data.mem.length; + + gpgme_data_release (dh); + + return str; +} + + +/* Release the memory returned by gpgme_data_release_and_get_mem(). */ +void +gpgme_free (void *buffer) +{ + if (buffer) + free (buffer); +} + |