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#include <string.h>
#include "x-common.h"
gsize
pad (gsize length)
{
if (length % 4 == 0)
return 0;
return 4 - length % 4;
}
void
read_padding (gsize length, gsize *offset)
{
*offset += length;
}
guint8
read_card8 (const guint8 *buffer, gsize buffer_length, gsize *offset)
{
if (*offset >= buffer_length)
return 0;
(*offset)++;
return buffer[*offset - 1];
}
guint16
read_card16 (const guint8 *buffer, gsize buffer_length, guint8 byte_order, gsize *offset)
{
guint8 a, b;
a = read_card8 (buffer, buffer_length, offset);
b = read_card8 (buffer, buffer_length, offset);
if (byte_order == X_BYTE_ORDER_MSB)
return a << 8 | b;
else
return b << 8 | a;
}
guint32
read_card32 (const guint8 *buffer, gsize buffer_length, guint8 byte_order, gsize *offset)
{
guint8 a, b, c, d;
a = read_card8 (buffer, buffer_length, offset);
b = read_card8 (buffer, buffer_length, offset);
c = read_card8 (buffer, buffer_length, offset);
d = read_card8 (buffer, buffer_length, offset);
if (byte_order == X_BYTE_ORDER_MSB)
return a << 24 | b << 16 | c << 8 | d;
else
return d << 24 | c << 16 | b << 8 | a;
}
guint8 *
read_string8 (const guint8 *buffer, gsize buffer_length, gsize string_length, gsize *offset)
{
guint8 *string;
int i;
string = g_malloc (string_length + 1);
for (i = 0; i < string_length; i++)
string[i] = read_card8 (buffer, buffer_length, offset);
string[i] = '\0';
return string;
}
gchar *
read_string (const guint8 *buffer, gsize buffer_length, gsize string_length, gsize *offset)
{
return (gchar *) read_string8 (buffer, buffer_length, string_length, offset);
}
gchar *
read_padded_string (const guint8 *buffer, gsize buffer_length, gsize string_length, gsize *offset)
{
guint8 *value;
value = read_string8 (buffer, buffer_length, string_length, offset);
read_padding (pad (string_length), offset);
return (gchar *) value;
}
void
write_card8 (guint8 *buffer, gsize buffer_length, guint8 value, gsize *offset)
{
if (*offset >= buffer_length)
return;
buffer[*offset] = value;
(*offset)++;
}
void
write_padding (guint8 *buffer, gsize buffer_length, gsize length, gsize *offset)
{
gsize i;
for (i = 0; i < length; i++)
write_card8 (buffer, buffer_length, 0, offset);
}
void
write_card16 (guint8 *buffer, gsize buffer_length, guint8 byte_order, guint16 value, gsize *offset)
{
if (byte_order == X_BYTE_ORDER_MSB)
{
write_card8 (buffer, buffer_length, value >> 8, offset);
write_card8 (buffer, buffer_length, value & 0xFF, offset);
}
else
{
write_card8 (buffer, buffer_length, value & 0xFF, offset);
write_card8 (buffer, buffer_length, value >> 8, offset);
}
}
void
write_card32 (guint8 *buffer, gsize buffer_length, guint8 byte_order, guint32 value, gsize *offset)
{
if (byte_order == X_BYTE_ORDER_MSB)
{
write_card8 (buffer, buffer_length, value >> 24, offset);
write_card8 (buffer, buffer_length, (value >> 16) & 0xFF, offset);
write_card8 (buffer, buffer_length, (value >> 8) & 0xFF, offset);
write_card8 (buffer, buffer_length, value & 0xFF, offset);
}
else
{
write_card8 (buffer, buffer_length, value & 0xFF, offset);
write_card8 (buffer, buffer_length, (value >> 8) & 0xFF, offset);
write_card8 (buffer, buffer_length, (value >> 16) & 0xFF, offset);
write_card8 (buffer, buffer_length, value >> 24, offset);
}
}
void
write_string8 (guint8 *buffer, gsize buffer_length, const guint8 *value, gsize value_length, gsize *offset)
{
gsize i;
for (i = 0; i < value_length; i++)
write_card8 (buffer, buffer_length, value[i], offset);
}
gsize
padded_string_length (const gchar *value)
{
return (strlen (value) + pad (strlen (value))) / 4;
}
void
write_string (guint8 *buffer, gsize buffer_length, const gchar *value, gsize *offset)
{
write_string8 (buffer, buffer_length, (guint8 *) value, strlen (value), offset);
}
void
write_padded_string (guint8 *buffer, gsize buffer_length, const gchar *value, gsize *offset)
{
write_string8 (buffer, buffer_length, (guint8 *) value, strlen (value), offset);
write_padding (buffer, buffer_length, pad (strlen (value)), offset);
}
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