/*
+ *
+ * bufaux.c
+ *
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ *
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ * All rights reserved
+ *
+ * Created: Wed Mar 29 02:24:47 1995 ylo
+ *
+ * Auxiliary functions for storing and retrieving various data types to/from
+ * Buffers.
+ *
+ */
-bufaux.c
-
-Author: Tatu Ylonen <ylo@cs.hut.fi>
-
-Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
- All rights reserved
-
-Created: Wed Mar 29 02:24:47 1995 ylo
-
-Auxiliary functions for storing and retrieving various data types to/from
-Buffers.
-
-*/
-
-#include "config.h"
#include "includes.h"
RCSID("$Id$");
#include "xmalloc.h"
#include "getput.h"
-/* Stores an BIGNUM in the buffer with a 2-byte msb first bit count, followed
- by (bits+7)/8 bytes of binary data, msb first. */
-
+/*
+ * Stores an BIGNUM in the buffer with a 2-byte msb first bit count, followed
+ * by (bits+7)/8 bytes of binary data, msb first.
+ */
void
buffer_put_bignum(Buffer *buffer, BIGNUM *value)
{
- int bits = BN_num_bits(value);
- int bin_size = (bits + 7) / 8;
- char *buf = xmalloc(bin_size);
- int oi;
- char msg[2];
-
- /* Get the value of in binary */
- oi = BN_bn2bin(value, buf);
- assert(oi == bin_size);
-
- /* Store the number of bits in the buffer in two bytes, msb first. */
- PUT_16BIT(msg, bits);
- buffer_append(buffer, msg, 2);
- /* Store the binary data. */
- buffer_append(buffer, buf, oi);
- /* Clear the temporary data. */
- memset(buf, 0, bin_size);
- xfree(buf);
+ int bits = BN_num_bits(value);
+ int bin_size = (bits + 7) / 8;
+ char *buf = xmalloc(bin_size);
+ int oi;
+ char msg[2];
+
+ /* Get the value of in binary */
+ oi = BN_bn2bin(value, buf);
+ if (oi != bin_size)
+ fatal("buffer_put_bignum: BN_bn2bin() failed: oi %d != bin_size %d",
+ oi, bin_size);
+
+ /* Store the number of bits in the buffer in two bytes, msb first. */
+ PUT_16BIT(msg, bits);
+ buffer_append(buffer, msg, 2);
+ /* Store the binary data. */
+ buffer_append(buffer, buf, oi);
+ /* Clear the temporary data. */
+ memset(buf, 0, bin_size);
+ xfree(buf);
}
-/* Retrieves an BIGNUM from the buffer. */
-
+/*
+ * Retrieves an BIGNUM from the buffer.
+ */
int
buffer_get_bignum(Buffer *buffer, BIGNUM *value)
{
- int bits, bytes;
- unsigned char buf[2], *bin;
-
- /* Get the number for bits. */
- buffer_get(buffer, (char *)buf, 2);
- bits = GET_16BIT(buf);
- /* Compute the number of binary bytes that follow. */
- bytes = (bits + 7) / 8;
- bin = xmalloc(bytes);
- buffer_get(buffer, bin, bytes);
- BN_bin2bn(bin, bytes, value);
- xfree(bin);
-
- return 2 + bytes;
+ int bits, bytes;
+ unsigned char buf[2], *bin;
+
+ /* Get the number for bits. */
+ buffer_get(buffer, (char *) buf, 2);
+ bits = GET_16BIT(buf);
+ /* Compute the number of binary bytes that follow. */
+ bytes = (bits + 7) / 8;
+ if (buffer_len(buffer) < bytes)
+ fatal("buffer_get_bignum: input buffer too small");
+ bin = buffer_ptr(buffer);
+ BN_bin2bn(bin, bytes, value);
+ buffer_consume(buffer, bytes);
+
+ return 2 + bytes;
}
-/* Returns an integer from the buffer (4 bytes, msb first). */
-
-unsigned int buffer_get_int(Buffer *buffer)
+/*
+ * Returns an integer from the buffer (4 bytes, msb first).
+ */
+unsigned int
+buffer_get_int(Buffer *buffer)
{
- unsigned char buf[4];
- buffer_get(buffer, (char *)buf, 4);
- return GET_32BIT(buf);
+ unsigned char buf[4];
+ buffer_get(buffer, (char *) buf, 4);
+ return GET_32BIT(buf);
}
-/* Stores an integer in the buffer in 4 bytes, msb first. */
-
-void buffer_put_int(Buffer *buffer, unsigned int value)
+/*
+ * Stores an integer in the buffer in 4 bytes, msb first.
+ */
+void
+buffer_put_int(Buffer *buffer, unsigned int value)
{
- char buf[4];
- PUT_32BIT(buf, value);
- buffer_append(buffer, buf, 4);
+ char buf[4];
+ PUT_32BIT(buf, value);
+ buffer_append(buffer, buf, 4);
}
-/* Returns an arbitrary binary string from the buffer. The string cannot
- be longer than 256k. The returned value points to memory allocated
- with xmalloc; it is the responsibility of the calling function to free
- the data. If length_ptr is non-NULL, the length of the returned data
- will be stored there. A null character will be automatically appended
- to the returned string, and is not counted in length. */
-
-char *buffer_get_string(Buffer *buffer, unsigned int *length_ptr)
+/*
+ * Returns an arbitrary binary string from the buffer. The string cannot
+ * be longer than 256k. The returned value points to memory allocated
+ * with xmalloc; it is the responsibility of the calling function to free
+ * the data. If length_ptr is non-NULL, the length of the returned data
+ * will be stored there. A null character will be automatically appended
+ * to the returned string, and is not counted in length.
+ */
+char *
+buffer_get_string(Buffer *buffer, unsigned int *length_ptr)
{
- unsigned int len;
- char *value;
- /* Get the length. */
- len = buffer_get_int(buffer);
- if (len > 256*1024)
- fatal("Received packet with bad string length %d", len);
- /* Allocate space for the string. Add one byte for a null character. */
- value = xmalloc(len + 1);
- /* Get the string. */
- buffer_get(buffer, value, len);
- /* Append a null character to make processing easier. */
- value[len] = 0;
- /* Optionally return the length of the string. */
- if (length_ptr)
- *length_ptr = len;
- return value;
+ unsigned int len;
+ char *value;
+ /* Get the length. */
+ len = buffer_get_int(buffer);
+ if (len > 256 * 1024)
+ fatal("Received packet with bad string length %d", len);
+ /* Allocate space for the string. Add one byte for a null character. */
+ value = xmalloc(len + 1);
+ /* Get the string. */
+ buffer_get(buffer, value, len);
+ /* Append a null character to make processing easier. */
+ value[len] = 0;
+ /* Optionally return the length of the string. */
+ if (length_ptr)
+ *length_ptr = len;
+ return value;
}
-/* Stores and arbitrary binary string in the buffer. */
-
-void buffer_put_string(Buffer *buffer, const void *buf, unsigned int len)
+/*
+ * Stores and arbitrary binary string in the buffer.
+ */
+void
+buffer_put_string(Buffer *buffer, const void *buf, unsigned int len)
{
- buffer_put_int(buffer, len);
- buffer_append(buffer, buf, len);
+ buffer_put_int(buffer, len);
+ buffer_append(buffer, buf, len);
}
-/* Returns a character from the buffer (0 - 255). */
-
-int buffer_get_char(Buffer *buffer)
+/*
+ * Returns a character from the buffer (0 - 255).
+ */
+int
+buffer_get_char(Buffer *buffer)
{
- char ch;
- buffer_get(buffer, &ch, 1);
- return (unsigned char)ch;
+ char ch;
+ buffer_get(buffer, &ch, 1);
+ return (unsigned char) ch;
}
-/* Stores a character in the buffer. */
-
-void buffer_put_char(Buffer *buffer, int value)
+/*
+ * Stores a character in the buffer.
+ */
+void
+buffer_put_char(Buffer *buffer, int value)
{
- char ch = value;
- buffer_append(buffer, &ch, 1);
+ char ch = value;
+ buffer_append(buffer, &ch, 1);
}
andersk / openssh.git / blobdiff