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qt_rtmp_demo/librtmp/amf.c

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/*
* Copyright (C) 2005-2008 Team XBMC
* http://www.xbmc.org
* Copyright (C) 2008-2009 Andrej Stepanchuk
* Copyright (C) 2009-2010 Howard Chu
*
* This file is part of librtmp.
*
* librtmp 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,
* or (at your option) any later version.
*
* librtmp 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 General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with librtmp see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/lgpl.html
*/
#include <string.h>
#include <assert.h>
#include <stdlib.h>
#include "rtmp_sys.h"
#include "amf.h"
#include "log.h"
#include "bytes.h"
static const AMFObjectProperty AMFProp_Invalid = { {0, 0}, AMF_INVALID };
static const AMFObject AMFObj_Invalid = { 0, 0 };
static const AVal AV_empty = { 0, 0 };
/* Data is Big-Endian */
unsigned short
AMF_DecodeInt16(const char *data)
{
unsigned char *c = (unsigned char *) data;
unsigned short val;
val = (c[0] << 8) | c[1];
return val;
}
unsigned int
AMF_DecodeInt24(const char *data)
{
unsigned char *c = (unsigned char *) data;
unsigned int val;
val = (c[0] << 16) | (c[1] << 8) | c[2];
return val;
}
unsigned int
AMF_DecodeInt32(const char *data)
{
unsigned char *c = (unsigned char *)data;
unsigned int val;
val = (c[0] << 24) | (c[1] << 16) | (c[2] << 8) | c[3];
return val;
}
void
AMF_DecodeString(const char *data, AVal *bv)
{
bv->av_len = AMF_DecodeInt16(data);
bv->av_val = (bv->av_len > 0) ? (char *)data + 2 : NULL;
}
void
AMF_DecodeLongString(const char *data, AVal *bv)
{
bv->av_len = AMF_DecodeInt32(data);
bv->av_val = (bv->av_len > 0) ? (char *)data + 4 : NULL;
}
double
AMF_DecodeNumber(const char *data)
{
double dVal;
#if __FLOAT_WORD_ORDER == __BYTE_ORDER
#if __BYTE_ORDER == __BIG_ENDIAN
memcpy(&dVal, data, 8);
#elif __BYTE_ORDER == __LITTLE_ENDIAN
unsigned char *ci, *co;
ci = (unsigned char *)data;
co = (unsigned char *)&dVal;
co[0] = ci[7];
co[1] = ci[6];
co[2] = ci[5];
co[3] = ci[4];
co[4] = ci[3];
co[5] = ci[2];
co[6] = ci[1];
co[7] = ci[0];
#endif
#else
#if __BYTE_ORDER == __LITTLE_ENDIAN /* __FLOAT_WORD_ORER == __BIG_ENDIAN */
unsigned char *ci, *co;
ci = (unsigned char *)data;
co = (unsigned char *)&dVal;
co[0] = ci[3];
co[1] = ci[2];
co[2] = ci[1];
co[3] = ci[0];
co[4] = ci[7];
co[5] = ci[6];
co[6] = ci[5];
co[7] = ci[4];
#else /* __BYTE_ORDER == __BIG_ENDIAN && __FLOAT_WORD_ORER == __LITTLE_ENDIAN */
unsigned char *ci, *co;
ci = (unsigned char *)data;
co = (unsigned char *)&dVal;
co[0] = ci[4];
co[1] = ci[5];
co[2] = ci[6];
co[3] = ci[7];
co[4] = ci[0];
co[5] = ci[1];
co[6] = ci[2];
co[7] = ci[3];
#endif
#endif
return dVal;
}
int
AMF_DecodeBoolean(const char *data)
{
return *data != 0;
}
char *
AMF_EncodeInt16(char *output, char *outend, short nVal)
{
if (output+2 > outend)
return NULL;
output[1] = nVal & 0xff;
output[0] = nVal >> 8;
return output+2;
}
char *
AMF_EncodeInt24(char *output, char *outend, int nVal)
{
if (output+3 > outend)
return NULL;
output[2] = nVal & 0xff;
output[1] = nVal >> 8;
output[0] = nVal >> 16;
return output+3;
}
char *
AMF_EncodeInt32(char *output, char *outend, int nVal)
{
if (output+4 > outend)
return NULL;
output[3] = nVal & 0xff;
output[2] = nVal >> 8;
output[1] = nVal >> 16;
output[0] = nVal >> 24;
return output+4;
}
char *
AMF_EncodeString(char *output, char *outend, const AVal *bv)
{
if ((bv->av_len < 65536 && output + 1 + 2 + bv->av_len > outend) ||
output + 1 + 4 + bv->av_len > outend)
return NULL;
if (bv->av_len < 65536)
{
*output++ = AMF_STRING;
output = AMF_EncodeInt16(output, outend, bv->av_len);
}
else
{
*output++ = AMF_LONG_STRING;
output = AMF_EncodeInt32(output, outend, bv->av_len);
}
memcpy(output, bv->av_val, bv->av_len);
output += bv->av_len;
return output;
}
char *
AMF_EncodeNumber(char *output, char *outend, double dVal)
{
if (output+1+8 > outend)
return NULL;
*output++ = AMF_NUMBER; /* type: Number */
#if __FLOAT_WORD_ORDER == __BYTE_ORDER
#if __BYTE_ORDER == __BIG_ENDIAN
memcpy(output, &dVal, 8);
#elif __BYTE_ORDER == __LITTLE_ENDIAN
{
unsigned char *ci, *co;
ci = (unsigned char *)&dVal;
co = (unsigned char *)output;
co[0] = ci[7];
co[1] = ci[6];
co[2] = ci[5];
co[3] = ci[4];
co[4] = ci[3];
co[5] = ci[2];
co[6] = ci[1];
co[7] = ci[0];
}
#endif
#else
#if __BYTE_ORDER == __LITTLE_ENDIAN /* __FLOAT_WORD_ORER == __BIG_ENDIAN */
{
unsigned char *ci, *co;
ci = (unsigned char *)&dVal;
co = (unsigned char *)output;
co[0] = ci[3];
co[1] = ci[2];
co[2] = ci[1];
co[3] = ci[0];
co[4] = ci[7];
co[5] = ci[6];
co[6] = ci[5];
co[7] = ci[4];
}
#else /* __BYTE_ORDER == __BIG_ENDIAN && __FLOAT_WORD_ORER == __LITTLE_ENDIAN */
{
unsigned char *ci, *co;
ci = (unsigned char *)&dVal;
co = (unsigned char *)output;
co[0] = ci[4];
co[1] = ci[5];
co[2] = ci[6];
co[3] = ci[7];
co[4] = ci[0];
co[5] = ci[1];
co[6] = ci[2];
co[7] = ci[3];
}
#endif
#endif
return output+8;
}
char *
AMF_EncodeBoolean(char *output, char *outend, int bVal)
{
if (output+2 > outend)
return NULL;
*output++ = AMF_BOOLEAN;
*output++ = bVal ? 0x01 : 0x00;
return output;
}
char *
AMF_EncodeNamedString(char *output, char *outend, const AVal *strName, const AVal *strValue)
{
if (output+2+strName->av_len > outend)
return NULL;
output = AMF_EncodeInt16(output, outend, strName->av_len);
memcpy(output, strName->av_val, strName->av_len);
output += strName->av_len;
return AMF_EncodeString(output, outend, strValue);
}
char *
AMF_EncodeNamedNumber(char *output, char *outend, const AVal *strName, double dVal)
{
if (output+2+strName->av_len > outend)
return NULL;
output = AMF_EncodeInt16(output, outend, strName->av_len);
memcpy(output, strName->av_val, strName->av_len);
output += strName->av_len;
return AMF_EncodeNumber(output, outend, dVal);
}
char *
AMF_EncodeNamedBoolean(char *output, char *outend, const AVal *strName, int bVal)
{
if (output+2+strName->av_len > outend)
return NULL;
output = AMF_EncodeInt16(output, outend, strName->av_len);
memcpy(output, strName->av_val, strName->av_len);
output += strName->av_len;
return AMF_EncodeBoolean(output, outend, bVal);
}
void
AMFProp_GetName(AMFObjectProperty *prop, AVal *name)
{
*name = prop->p_name;
}
void
AMFProp_SetName(AMFObjectProperty *prop, AVal *name)
{
prop->p_name = *name;
}
AMFDataType
AMFProp_GetType(AMFObjectProperty *prop)
{
return prop->p_type;
}
double
AMFProp_GetNumber(AMFObjectProperty *prop)
{
return prop->p_vu.p_number;
}
int
AMFProp_GetBoolean(AMFObjectProperty *prop)
{
return prop->p_vu.p_number != 0;
}
void
AMFProp_GetString(AMFObjectProperty *prop, AVal *str)
{
if (prop->p_type == AMF_STRING)
*str = prop->p_vu.p_aval;
else
*str = AV_empty;
}
void
AMFProp_GetObject(AMFObjectProperty *prop, AMFObject *obj)
{
if (prop->p_type == AMF_OBJECT)
*obj = prop->p_vu.p_object;
else
*obj = AMFObj_Invalid;
}
int
AMFProp_IsValid(AMFObjectProperty *prop)
{
return prop->p_type != AMF_INVALID;
}
char *
AMFProp_Encode(AMFObjectProperty *prop, char *pBuffer, char *pBufEnd)
{
if (prop->p_type == AMF_INVALID)
return NULL;
if (prop->p_type != AMF_NULL && pBuffer + prop->p_name.av_len + 2 + 1 >= pBufEnd)
return NULL;
if (prop->p_type != AMF_NULL && prop->p_name.av_len)
{
*pBuffer++ = prop->p_name.av_len >> 8;
*pBuffer++ = prop->p_name.av_len & 0xff;
memcpy(pBuffer, prop->p_name.av_val, prop->p_name.av_len);
pBuffer += prop->p_name.av_len;
}
switch (prop->p_type)
{
case AMF_NUMBER:
pBuffer = AMF_EncodeNumber(pBuffer, pBufEnd, prop->p_vu.p_number);
break;
case AMF_BOOLEAN:
pBuffer = AMF_EncodeBoolean(pBuffer, pBufEnd, prop->p_vu.p_number != 0);
break;
case AMF_STRING:
pBuffer = AMF_EncodeString(pBuffer, pBufEnd, &prop->p_vu.p_aval);
break;
case AMF_NULL:
if (pBuffer+1 >= pBufEnd)
return NULL;
*pBuffer++ = AMF_NULL;
break;
case AMF_OBJECT:
pBuffer = AMF_Encode(&prop->p_vu.p_object, pBuffer, pBufEnd);
break;
case AMF_ECMA_ARRAY:
pBuffer = AMF_EncodeEcmaArray(&prop->p_vu.p_object, pBuffer, pBufEnd);
break;
case AMF_STRICT_ARRAY:
pBuffer = AMF_EncodeArray(&prop->p_vu.p_object, pBuffer, pBufEnd);
break;
default:
RTMP_Log(RTMP_LOGERROR, "%s, invalid type. %d", __FUNCTION__, prop->p_type);
pBuffer = NULL;
};
return pBuffer;
}
#define AMF3_INTEGER_MAX 268435455
#define AMF3_INTEGER_MIN -268435456
int
AMF3ReadInteger(const char *data, int32_t *valp)
{
int i = 0;
int32_t val = 0;
while (i <= 2)
{ /* handle first 3 bytes */
if (data[i] & 0x80)
{ /* byte used */
val <<= 7; /* shift up */
val |= (data[i] & 0x7f); /* add bits */
i++;
}
else
{
break;
}
}
if (i > 2)
{ /* use 4th byte, all 8bits */
val <<= 8;
val |= data[3];
/* range check */
if (val > AMF3_INTEGER_MAX)
val -= (1 << 29);
}
else
{ /* use 7bits of last unparsed byte (0xxxxxxx) */
val <<= 7;
val |= data[i];
}
*valp = val;
return i > 2 ? 4 : i + 1;
}
int
AMF3ReadString(const char *data, AVal *str)
{
int32_t ref = 0;
int len;
assert(str != 0);
len = AMF3ReadInteger(data, &ref);
data += len;
if ((ref & 0x1) == 0)
{ /* reference: 0xxx */
uint32_t refIndex = (ref >> 1);
RTMP_Log(RTMP_LOGDEBUG,
"%s, string reference, index: %d, not supported, ignoring!",
__FUNCTION__, refIndex);
str->av_val = NULL;
str->av_len = 0;
return len;
}
else
{
uint32_t nSize = (ref >> 1);
str->av_val = (char *)data;
str->av_len = nSize;
return len + nSize;
}
return len;
}
int
AMF3Prop_Decode(AMFObjectProperty *prop, const char *pBuffer, int nSize,
int bDecodeName)
{
int nOriginalSize = nSize;
AMF3DataType type;
prop->p_name.av_len = 0;
prop->p_name.av_val = NULL;
if (nSize == 0 || !pBuffer)
{
RTMP_Log(RTMP_LOGDEBUG, "empty buffer/no buffer pointer!");
return -1;
}
/* decode name */
if (bDecodeName)
{
AVal name;
int nRes = AMF3ReadString(pBuffer, &name);
if (name.av_len <= 0)
return nRes;
nSize -= nRes;
if (nSize <= 0)
return -1;
prop->p_name = name;
pBuffer += nRes;
}
/* decode */
type = *pBuffer++;
nSize--;
switch (type)
{
case AMF3_UNDEFINED:
case AMF3_NULL:
prop->p_type = AMF_NULL;
break;
case AMF3_FALSE:
prop->p_type = AMF_BOOLEAN;
prop->p_vu.p_number = 0.0;
break;
case AMF3_TRUE:
prop->p_type = AMF_BOOLEAN;
prop->p_vu.p_number = 1.0;
break;
case AMF3_INTEGER:
{
int32_t res = 0;
int len = AMF3ReadInteger(pBuffer, &res);
prop->p_vu.p_number = (double)res;
prop->p_type = AMF_NUMBER;
nSize -= len;
break;
}
case AMF3_DOUBLE:
if (nSize < 8)
return -1;
prop->p_vu.p_number = AMF_DecodeNumber(pBuffer);
prop->p_type = AMF_NUMBER;
nSize -= 8;
break;
case AMF3_STRING:
case AMF3_XML_DOC:
case AMF3_XML:
{
int len = AMF3ReadString(pBuffer, &prop->p_vu.p_aval);
prop->p_type = AMF_STRING;
nSize -= len;
break;
}
case AMF3_DATE:
{
int32_t res = 0;
int len = AMF3ReadInteger(pBuffer, &res);
nSize -= len;
pBuffer += len;
if ((res & 0x1) == 0)
{ /* reference */
uint32_t nIndex = (res >> 1);
RTMP_Log(RTMP_LOGDEBUG, "AMF3_DATE reference: %d, not supported!", nIndex);
}
else
{
if (nSize < 8)
return -1;
prop->p_vu.p_number = AMF_DecodeNumber(pBuffer);
nSize -= 8;
prop->p_type = AMF_NUMBER;
}
break;
}
case AMF3_OBJECT:
{
int nRes = AMF3_Decode(&prop->p_vu.p_object, pBuffer, nSize, TRUE);
if (nRes == -1)
return -1;
nSize -= nRes;
prop->p_type = AMF_OBJECT;
break;
}
case AMF3_ARRAY:
case AMF3_BYTE_ARRAY:
default:
RTMP_Log(RTMP_LOGDEBUG, "%s - AMF3 unknown/unsupported datatype 0x%02x, @%p",
__FUNCTION__, (unsigned char)(*pBuffer), pBuffer);
return -1;
}
if (nSize < 0)
return -1;
return nOriginalSize - nSize;
}
int
AMFProp_Decode(AMFObjectProperty *prop, const char *pBuffer, int nSize,
int bDecodeName)
{
int nOriginalSize = nSize;
int nRes;
prop->p_name.av_len = 0;
prop->p_name.av_val = NULL;
if (nSize == 0 || !pBuffer)
{
RTMP_Log(RTMP_LOGDEBUG, "%s: Empty buffer/no buffer pointer!", __FUNCTION__);
return -1;
}
if (bDecodeName && nSize < 4)
{ /* at least name (length + at least 1 byte) and 1 byte of data */
RTMP_Log(RTMP_LOGDEBUG,
"%s: Not enough data for decoding with name, less than 4 bytes!",
__FUNCTION__);
return -1;
}
if (bDecodeName)
{
unsigned short nNameSize = AMF_DecodeInt16(pBuffer);
if (nNameSize > nSize - 2)
{
RTMP_Log(RTMP_LOGDEBUG,
"%s: Name size out of range: namesize (%d) > len (%d) - 2",
__FUNCTION__, nNameSize, nSize);
return -1;
}
AMF_DecodeString(pBuffer, &prop->p_name);
nSize -= 2 + nNameSize;
pBuffer += 2 + nNameSize;
}
if (nSize == 0)
{
return -1;
}
nSize--;
prop->p_type = *pBuffer++;
switch (prop->p_type)
{
case AMF_NUMBER:
if (nSize < 8)
return -1;
prop->p_vu.p_number = AMF_DecodeNumber(pBuffer);
nSize -= 8;
break;
case AMF_BOOLEAN:
if (nSize < 1)
return -1;
prop->p_vu.p_number = (double)AMF_DecodeBoolean(pBuffer);
nSize--;
break;
case AMF_STRING:
{
unsigned short nStringSize = AMF_DecodeInt16(pBuffer);
if (nSize < (long)nStringSize + 2)
return -1;
AMF_DecodeString(pBuffer, &prop->p_vu.p_aval);
nSize -= (2 + nStringSize);
break;
}
case AMF_OBJECT:
{
int nRes = AMF_Decode(&prop->p_vu.p_object, pBuffer, nSize, TRUE);
if (nRes == -1)
return -1;
nSize -= nRes;
break;
}
case AMF_MOVIECLIP:
{
RTMP_Log(RTMP_LOGERROR, "AMF_MOVIECLIP reserved!");
return -1;
break;
}
case AMF_NULL:
case AMF_UNDEFINED:
case AMF_UNSUPPORTED:
prop->p_type = AMF_NULL;
break;
case AMF_REFERENCE:
{
RTMP_Log(RTMP_LOGERROR, "AMF_REFERENCE not supported!");
return -1;
break;
}
case AMF_ECMA_ARRAY:
{
nSize -= 4;
/* next comes the rest, mixed array has a final 0x000009 mark and names, so its an object */
nRes = AMF_Decode(&prop->p_vu.p_object, pBuffer + 4, nSize, TRUE);
if (nRes == -1)
return -1;
nSize -= nRes;
break;
}
case AMF_OBJECT_END:
{
return -1;
break;
}
case AMF_STRICT_ARRAY:
{
unsigned int nArrayLen = AMF_DecodeInt32(pBuffer);
nSize -= 4;
nRes = AMF_DecodeArray(&prop->p_vu.p_object, pBuffer + 4, nSize,
nArrayLen, FALSE);
if (nRes == -1)
return -1;
nSize -= nRes;
break;
}
case AMF_DATE:
{
RTMP_Log(RTMP_LOGDEBUG, "AMF_DATE");
if (nSize < 10)
return -1;
prop->p_vu.p_number = AMF_DecodeNumber(pBuffer);
prop->p_UTCoffset = AMF_DecodeInt16(pBuffer + 8);
nSize -= 10;
break;
}
case AMF_LONG_STRING:
case AMF_XML_DOC:
{
unsigned int nStringSize = AMF_DecodeInt32(pBuffer);
if (nSize < (long)nStringSize + 4)
return -1;
AMF_DecodeLongString(pBuffer, &prop->p_vu.p_aval);
nSize -= (4 + nStringSize);
if (prop->p_type == AMF_LONG_STRING)
prop->p_type = AMF_STRING;
break;
}
case AMF_RECORDSET:
{
RTMP_Log(RTMP_LOGERROR, "AMF_RECORDSET reserved!");
return -1;
break;
}
case AMF_TYPED_OBJECT:
{
RTMP_Log(RTMP_LOGERROR, "AMF_TYPED_OBJECT not supported!");
return -1;
break;
}
case AMF_AVMPLUS:
{
int nRes = AMF3_Decode(&prop->p_vu.p_object, pBuffer, nSize, TRUE);
if (nRes == -1)
return -1;
nSize -= nRes;
prop->p_type = AMF_OBJECT;
break;
}
default:
RTMP_Log(RTMP_LOGDEBUG, "%s - unknown datatype 0x%02x, @%p", __FUNCTION__,
prop->p_type, pBuffer - 1);
return -1;
}
return nOriginalSize - nSize;
}
void
AMFProp_Dump(AMFObjectProperty *prop)
{
char strRes[256];
char str[256];
AVal name;
if (prop->p_type == AMF_INVALID)
{
RTMP_Log(RTMP_LOGDEBUG, "Property: INVALID");
return;
}
if (prop->p_type == AMF_NULL)
{
RTMP_Log(RTMP_LOGDEBUG, "Property: NULL");
return;
}
if (prop->p_name.av_len)
{
name = prop->p_name;
}
else
{
name.av_val = "no-name.";
name.av_len = sizeof("no-name.") - 1;
}
if (name.av_len > 18)
name.av_len = 18;
snprintf(strRes, 255, "Name: %18.*s, ", name.av_len, name.av_val);
if (prop->p_type == AMF_OBJECT)
{
RTMP_Log(RTMP_LOGDEBUG, "Property: <%sOBJECT>", strRes);
AMF_Dump(&prop->p_vu.p_object);
return;
}
else if (prop->p_type == AMF_ECMA_ARRAY)
{
RTMP_Log(RTMP_LOGDEBUG, "Property: <%sECMA_ARRAY>", strRes);
AMF_Dump(&prop->p_vu.p_object);
return;
}
else if (prop->p_type == AMF_STRICT_ARRAY)
{
RTMP_Log(RTMP_LOGDEBUG, "Property: <%sSTRICT_ARRAY>", strRes);
AMF_Dump(&prop->p_vu.p_object);
return;
}
switch (prop->p_type)
{
case AMF_NUMBER:
snprintf(str, 255, "NUMBER:\t%.2f", prop->p_vu.p_number);
break;
case AMF_BOOLEAN:
snprintf(str, 255, "BOOLEAN:\t%s",
prop->p_vu.p_number != 0.0 ? "TRUE" : "FALSE");
break;
case AMF_STRING:
snprintf(str, 255, "STRING:\t%.*s", prop->p_vu.p_aval.av_len,
prop->p_vu.p_aval.av_val);
break;
case AMF_DATE:
snprintf(str, 255, "DATE:\ttimestamp: %.2f, UTC offset: %d",
prop->p_vu.p_number, prop->p_UTCoffset);
break;
default:
snprintf(str, 255, "INVALID TYPE 0x%02x", (unsigned char)prop->p_type);
}
RTMP_Log(RTMP_LOGDEBUG, "Property: <%s%s>", strRes, str);
}
void
AMFProp_Reset(AMFObjectProperty *prop)
{
if (prop->p_type == AMF_OBJECT || prop->p_type == AMF_ECMA_ARRAY ||
prop->p_type == AMF_STRICT_ARRAY)
AMF_Reset(&prop->p_vu.p_object);
else
{
prop->p_vu.p_aval.av_len = 0;
prop->p_vu.p_aval.av_val = NULL;
}
prop->p_type = AMF_INVALID;
}
/* AMFObject */
char *
AMF_Encode(AMFObject *obj, char *pBuffer, char *pBufEnd)
{
int i;
if (pBuffer+4 >= pBufEnd)
return NULL;
*pBuffer++ = AMF_OBJECT;
for (i = 0; i < obj->o_num; i++)
{
char *res = AMFProp_Encode(&obj->o_props[i], pBuffer, pBufEnd);
if (res == NULL)
{
RTMP_Log(RTMP_LOGERROR, "AMF_Encode - failed to encode property in index %d",
i);
break;
}
else
{
pBuffer = res;
}
}
if (pBuffer + 3 >= pBufEnd)
return NULL; /* no room for the end marker */
pBuffer = AMF_EncodeInt24(pBuffer, pBufEnd, AMF_OBJECT_END);
return pBuffer;
}
char *
AMF_EncodeEcmaArray(AMFObject *obj, char *pBuffer, char *pBufEnd)
{
int i;
if (pBuffer+4 >= pBufEnd)
return NULL;
*pBuffer++ = AMF_ECMA_ARRAY;
pBuffer = AMF_EncodeInt32(pBuffer, pBufEnd, obj->o_num);
for (i = 0; i < obj->o_num; i++)
{
char *res = AMFProp_Encode(&obj->o_props[i], pBuffer, pBufEnd);
if (res == NULL)
{
RTMP_Log(RTMP_LOGERROR, "AMF_Encode - failed to encode property in index %d",
i);
break;
}
else
{
pBuffer = res;
}
}
if (pBuffer + 3 >= pBufEnd)
return NULL; /* no room for the end marker */
pBuffer = AMF_EncodeInt24(pBuffer, pBufEnd, AMF_OBJECT_END);
return pBuffer;
}
char *
AMF_EncodeArray(AMFObject *obj, char *pBuffer, char *pBufEnd)
{
int i;
if (pBuffer+4 >= pBufEnd)
return NULL;
*pBuffer++ = AMF_STRICT_ARRAY;
pBuffer = AMF_EncodeInt32(pBuffer, pBufEnd, obj->o_num);
for (i = 0; i < obj->o_num; i++)
{
char *res = AMFProp_Encode(&obj->o_props[i], pBuffer, pBufEnd);
if (res == NULL)
{
RTMP_Log(RTMP_LOGERROR, "AMF_Encode - failed to encode property in index %d",
i);
break;
}
else
{
pBuffer = res;
}
}
//if (pBuffer + 3 >= pBufEnd)
// return NULL; /* no room for the end marker */
//pBuffer = AMF_EncodeInt24(pBuffer, pBufEnd, AMF_OBJECT_END);
return pBuffer;
}
int
AMF_DecodeArray(AMFObject *obj, const char *pBuffer, int nSize,
int nArrayLen, int bDecodeName)
{
int nOriginalSize = nSize;
int bError = FALSE;
obj->o_num = 0;
obj->o_props = NULL;
while (nArrayLen > 0)
{
AMFObjectProperty prop;
int nRes;
nArrayLen--;
if (nSize <= 0)
{
bError = TRUE;
break;
}
nRes = AMFProp_Decode(&prop, pBuffer, nSize, bDecodeName);
if (nRes == -1)
{
bError = TRUE;
break;
}
else
{
nSize -= nRes;
pBuffer += nRes;
AMF_AddProp(obj, &prop);
}
}
if (bError)
return -1;
return nOriginalSize - nSize;
}
int
AMF3_Decode(AMFObject *obj, const char *pBuffer, int nSize, int bAMFData)
{
int nOriginalSize = nSize;
int32_t ref;
int len;
obj->o_num = 0;
obj->o_props = NULL;
if (bAMFData)
{
if (*pBuffer != AMF3_OBJECT)
RTMP_Log(RTMP_LOGERROR,
"AMF3 Object encapsulated in AMF stream does not start with AMF3_OBJECT!");
pBuffer++;
nSize--;
}
ref = 0;
len = AMF3ReadInteger(pBuffer, &ref);
pBuffer += len;
nSize -= len;
if ((ref & 1) == 0)
{ /* object reference, 0xxx */
uint32_t objectIndex = (ref >> 1);
RTMP_Log(RTMP_LOGDEBUG, "Object reference, index: %d", objectIndex);
}
else /* object instance */
{
int32_t classRef = (ref >> 1);
AMF3ClassDef cd = { {0, 0}
};
AMFObjectProperty prop;
if ((classRef & 0x1) == 0)
{ /* class reference */
uint32_t classIndex = (classRef >> 1);
RTMP_Log(RTMP_LOGDEBUG, "Class reference: %d", classIndex);
}
else
{
int32_t classExtRef = (classRef >> 1);
int i, cdnum;
cd.cd_externalizable = (classExtRef & 0x1) == 1;
cd.cd_dynamic = ((classExtRef >> 1) & 0x1) == 1;
cdnum = classExtRef >> 2;
/* class name */
len = AMF3ReadString(pBuffer, &cd.cd_name);
nSize -= len;
pBuffer += len;
/*std::string str = className; */
RTMP_Log(RTMP_LOGDEBUG,
"Class name: %s, externalizable: %d, dynamic: %d, classMembers: %d",
cd.cd_name.av_val, cd.cd_externalizable, cd.cd_dynamic,
cd.cd_num);
for (i = 0; i < cdnum; i++)
{
AVal memberName;
if (nSize <=0)
{
invalid:
RTMP_Log(RTMP_LOGDEBUG, "%s, invalid class encoding!",
__FUNCTION__);
return nOriginalSize;
}
len = AMF3ReadString(pBuffer, &memberName);
RTMP_Log(RTMP_LOGDEBUG, "Member: %s", memberName.av_val);
AMF3CD_AddProp(&cd, &memberName);
nSize -= len;
pBuffer += len;
}
}
/* add as referencable object */
if (cd.cd_externalizable)
{
int nRes;
AVal name = AVC("DEFAULT_ATTRIBUTE");
RTMP_Log(RTMP_LOGDEBUG, "Externalizable, TODO check");
nRes = AMF3Prop_Decode(&prop, pBuffer, nSize, FALSE);
if (nRes == -1)
RTMP_Log(RTMP_LOGDEBUG, "%s, failed to decode AMF3 property!",
__FUNCTION__);
else
{
nSize -= nRes;
pBuffer += nRes;
}
AMFProp_SetName(&prop, &name);
AMF_AddProp(obj, &prop);
}
else
{
int nRes, i;
for (i = 0; i < cd.cd_num; i++) /* non-dynamic */
{
if (nSize <=0)
goto invalid;
nRes = AMF3Prop_Decode(&prop, pBuffer, nSize, FALSE);
if (nRes == -1)
RTMP_Log(RTMP_LOGDEBUG, "%s, failed to decode AMF3 property!",
__FUNCTION__);
AMFProp_SetName(&prop, AMF3CD_GetProp(&cd, i));
AMF_AddProp(obj, &prop);
pBuffer += nRes;
nSize -= nRes;
}
if (cd.cd_dynamic)
{
int len = 0;
do
{
if (nSize <=0)
goto invalid;
nRes = AMF3Prop_Decode(&prop, pBuffer, nSize, TRUE);
AMF_AddProp(obj, &prop);
pBuffer += nRes;
nSize -= nRes;
len = prop.p_name.av_len;
}
while (len > 0);
}
}
RTMP_Log(RTMP_LOGDEBUG, "class object!");
}
return nOriginalSize - nSize;
}
int
AMF_Decode(AMFObject *obj, const char *pBuffer, int nSize, int bDecodeName)
{
int nOriginalSize = nSize;
int bError = FALSE; /* if there is an error while decoding - try to at least find the end mark AMF_OBJECT_END */
obj->o_num = 0;
obj->o_props = NULL;
while (nSize > 0)
{
AMFObjectProperty prop;
int nRes;
if (nSize >=3 && AMF_DecodeInt24(pBuffer) == AMF_OBJECT_END)
{
nSize -= 3;
bError = FALSE;
break;
}
if (bError)
{
RTMP_Log(RTMP_LOGERROR,
"DECODING ERROR, IGNORING BYTES UNTIL NEXT KNOWN PATTERN!");
nSize--;
pBuffer++;
continue;
}
nRes = AMFProp_Decode(&prop, pBuffer, nSize, bDecodeName);
if (nRes == -1)
{
bError = TRUE;
break;
}
else
{
nSize -= nRes;
if (nSize < 0)
{
bError = TRUE;
break;
}
pBuffer += nRes;
AMF_AddProp(obj, &prop);
}
}
if (bError)
return -1;
return nOriginalSize - nSize;
}
void
AMF_AddProp(AMFObject *obj, const AMFObjectProperty *prop)
{
if (!(obj->o_num & 0x0f))
obj->o_props =
realloc(obj->o_props, (obj->o_num + 16) * sizeof(AMFObjectProperty));
memcpy(&obj->o_props[obj->o_num++], prop, sizeof(AMFObjectProperty));
}
int
AMF_CountProp(AMFObject *obj)
{
return obj->o_num;
}
AMFObjectProperty *
AMF_GetProp(AMFObject *obj, const AVal *name, int nIndex)
{
if (nIndex >= 0)
{
if (nIndex < obj->o_num)
return &obj->o_props[nIndex];
}
else
{
int n;
for (n = 0; n < obj->o_num; n++)
{
if (AVMATCH(&obj->o_props[n].p_name, name))
return &obj->o_props[n];
}
}
return (AMFObjectProperty *)&AMFProp_Invalid;
}
void
AMF_Dump(AMFObject *obj)
{
int n;
RTMP_Log(RTMP_LOGDEBUG, "(object begin)");
for (n = 0; n < obj->o_num; n++)
{
AMFProp_Dump(&obj->o_props[n]);
}
RTMP_Log(RTMP_LOGDEBUG, "(object end)");
}
void
AMF_Reset(AMFObject *obj)
{
int n;
for (n = 0; n < obj->o_num; n++)
{
AMFProp_Reset(&obj->o_props[n]);
}
free(obj->o_props);
obj->o_props = NULL;
obj->o_num = 0;
}
/* AMF3ClassDefinition */
void
AMF3CD_AddProp(AMF3ClassDef *cd, AVal *prop)
{
if (!(cd->cd_num & 0x0f))
cd->cd_props = realloc(cd->cd_props, (cd->cd_num + 16) * sizeof(AVal));
cd->cd_props[cd->cd_num++] = *prop;
}
AVal *
AMF3CD_GetProp(AMF3ClassDef *cd, int nIndex)
{
if (nIndex >= cd->cd_num)
return (AVal *)&AV_empty;
return &cd->cd_props[nIndex];
}
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