diff options
Diffstat (limited to 'common/sdp-expat.c')
| -rw-r--r-- | common/sdp-expat.c | 381 |
1 files changed, 381 insertions, 0 deletions
diff --git a/common/sdp-expat.c b/common/sdp-expat.c index 0ab15d7a..cc2ff575 100644 --- a/common/sdp-expat.c +++ b/common/sdp-expat.c @@ -25,9 +25,390 @@ #include <config.h> #endif +#include <stdio.h> +#include <errno.h> +#include <malloc.h> + #include <bluetooth/sdp.h> #include <bluetooth/sdp_lib.h> #include <expat.h> +#include "logging.h" #include "sdp-xml.h" + +/* Expat specific implementation of the context struct */ + +struct sdp_xml_data { + char *text; /* Pointer to the current buffer */ + int size; /* Size of the current buffer */ + sdp_data_t *data; /* The current item being built */ + struct sdp_xml_data *next; /* Next item on the stack */ + char type; /* 0 = Text or Hexadecimal */ + char *name; /* Name, optional in the dtd */ + /* TODO: What is it used for? */ +}; + +struct sdp_xml_context { + XML_Parser parser; /* Parser object being used */ + sdp_record_t *sdprec; /* SDP Record being built */ + struct sdp_xml_data *stack_head; /* Top of the stack of attributes */ + int attrId; /* Id of the most recently processed attribute */ +}; + +#define DEFAULT_XML_DATA_SIZE 1024 + +static struct sdp_xml_data *sdp_xml_data_alloc() +{ + struct sdp_xml_data *elem; + + elem = malloc(sizeof(struct sdp_xml_data)); + + /* Null terminate the text */ + elem->size = DEFAULT_XML_DATA_SIZE; + elem->text = malloc(DEFAULT_XML_DATA_SIZE); + elem->text[0] = '\0'; + + elem->next = 0; + elem->data = 0; + + elem->type = 0; + elem->name = 0; + + return elem; +} + +static void sdp_xml_data_free(struct sdp_xml_data *elem) +{ + if (elem->data) + sdp_data_free(elem->data); + + if (elem->name) + free(elem->name); + + free(elem->text); + free(elem); +} + +static struct sdp_xml_data *sdp_xml_data_expand(struct sdp_xml_data *elem) +{ + char *newbuf; + + newbuf = malloc(elem->size * 2); + if (!newbuf) + return NULL; + + memcpy(newbuf, elem->text, elem->size); + elem->size *= 2; + free(elem->text); + + elem->text = newbuf; + + return elem; +} + +static sdp_data_t *sdp_xml_parse_datatype(const char *el, + struct sdp_xml_context *context) +{ + const char *data = context->stack_head->text; + + if (!strcmp(el, "bool")) + return sdp_xml_parse_int(data, SDP_BOOL); + else if (!strcmp(el, "uint8")) + return sdp_xml_parse_int(data, SDP_UINT8); + else if (!strcmp(el, "uint16")) + return sdp_xml_parse_int(data, SDP_UINT16); + else if (!strcmp(el, "uint32")) + return sdp_xml_parse_int(data, SDP_UINT32); + else if (!strcmp(el, "uint64")) + return sdp_xml_parse_int(data, SDP_UINT64); + else if (!strcmp(el, "uint128")) + return sdp_xml_parse_int(data, SDP_UINT128); + else if (!strcmp(el, "int8")) + return sdp_xml_parse_int(data, SDP_INT8); + else if (!strcmp(el, "int16")) + return sdp_xml_parse_int(data, SDP_INT16); + else if (!strcmp(el, "int32")) + return sdp_xml_parse_int(data, SDP_INT32); + else if (!strcmp(el, "int64")) + return sdp_xml_parse_int(data, SDP_INT64); + else if (!strcmp(el, "int128")) + return sdp_xml_parse_int(data, SDP_INT128); + else if (!strcmp(el, "uuid")) + return sdp_xml_parse_uuid(data); + else if (!strcmp(el, "url")) + return sdp_xml_parse_url(data); + else if (!strcmp(el, "text")) + return sdp_xml_parse_text(data, context->stack_head->type); + else if (!strcmp(el, "nil")) + return sdp_xml_parse_nil(data); + + return NULL; +} + +static void convert_xml_to_sdp_start(void *data, const char *el, const char **attr) +{ + struct sdp_xml_context *context = data; + int i; + + if (!strcmp(el, "record")) + return; + + if (!strcmp(el, "attribute")) { + /* Get the ID */ + for (i = 0; attr[i]; i += 1) { + if (!strcmp(attr[i], "id")) { + context->attrId = + strtol(attr[i + 1], 0, 0); + break; + } + } + + return; + } + + /* Assume every other tag is an element of some sort */ + if (context->stack_head) { + struct sdp_xml_data *newelem = sdp_xml_data_alloc(); + newelem->next = context->stack_head; + context->stack_head = newelem; + } else { + context->stack_head = sdp_xml_data_alloc(); + context->stack_head->next = 0; + } + + if (!strcmp(el, "sequence")) + context->stack_head->data = sdp_data_alloc(SDP_SEQ8, NULL); + else if (!strcmp(el, "alternate")) + context->stack_head->data = sdp_data_alloc(SDP_ALT8, NULL); + else { + const char *type = el; + /* Parse value, name, encoding */ + for (i = 0; attr[i]; i += 2) { + if (!strcmp(attr[i], "value")) { + int curlen = + strlen(context->stack_head->text); + int attrlen = strlen(attr[i + 1]); + + /* Ensure we're big enough */ + while ((curlen + 1 + attrlen) > + context->stack_head->size) { + sdp_xml_data_expand(context-> + stack_head); + } + + memcpy(&context->stack_head->text[curlen], + attr[i + 1], attrlen); + context->stack_head->text[curlen + + attrlen] = '\0'; + } + + if (!strcmp(attr[i], "encoding")) { + if (!strcmp(attr[i + 1], "hex")) + context->stack_head->type = 1; + } + + if (!strcmp(attr[i], "name")) { + context->stack_head->name = + strdup(attr[i + 1]); + } + } + + context->stack_head->data = + sdp_xml_parse_datatype(type, context); + + /* Could not parse an entry */ + if (context->stack_head->data == NULL) + XML_StopParser(context->parser, 0); + } +} + +static int compute_seq_size(sdp_data_t *data) +{ + int unit_size = data->unitSize; + sdp_data_t *seq = data->val.dataseq; + + for (; seq; seq = seq->next) + unit_size += seq->unitSize; + + return unit_size; +} + +static void convert_xml_to_sdp_end(void *data, const char *el) +{ + struct sdp_xml_context *context = data; + struct sdp_xml_data *elem; + + if (!strcmp(el, "record")) + return; + + if (!strcmp(el, "attribute")) { + if (context->stack_head && context->stack_head->data) { + int ret = sdp_attr_add(context->sdprec, + context->attrId, + context->stack_head->data); + if (ret == -1) + debug("Trouble adding attribute\n"); + + context->stack_head->data = 0; + sdp_xml_data_free(context->stack_head); + context->stack_head = 0; + } else { + debug("No Data for attribute: %d\n", + context->attrId); + } + + return; + } else if (!strcmp(el, "sequence")) { + context->stack_head->data->unitSize = + compute_seq_size(context->stack_head->data); + + if (context->stack_head->data->unitSize > USHRT_MAX) { + context->stack_head->data->unitSize += + sizeof(uint32_t); + context->stack_head->data->dtd = SDP_SEQ32; + } else if (context->stack_head->data->unitSize > UCHAR_MAX) { + context->stack_head->data->unitSize += + sizeof(uint16_t); + context->stack_head->data->dtd = SDP_SEQ16; + } else { + context->stack_head->data->unitSize += + sizeof(uint8_t); + } + } else if (!strcmp(el, "alternate")) { + context->stack_head->data->unitSize = + compute_seq_size(context->stack_head->data); + + if (context->stack_head->data->unitSize > USHRT_MAX) { + context->stack_head->data->unitSize += + sizeof(uint32_t); + context->stack_head->data->dtd = SDP_ALT32; + } else if (context->stack_head->data->unitSize > UCHAR_MAX) { + context->stack_head->data->unitSize += + sizeof(uint16_t); + context->stack_head->data->dtd = SDP_ALT16; + } else { + context->stack_head->data->unitSize += + sizeof(uint8_t); + } + } + + /* If we're not inside a seq or alt, then we're inside an attribute + which will be taken care of later + */ + if (context->stack_head->next && + context->stack_head->data && context->stack_head->next->data) { + switch (context->stack_head->next->data->dtd) { + case SDP_SEQ8: + case SDP_SEQ16: + case SDP_SEQ32: + case SDP_ALT8: + case SDP_ALT16: + case SDP_ALT32: + context->stack_head->next->data->val. + dataseq = + sdp_seq_append(context-> + stack_head-> + next->data-> + val.dataseq, + context->stack_head->data); + context->stack_head->data = 0; + break; + } + + elem = context->stack_head; + context->stack_head = context->stack_head->next; + + sdp_xml_data_free(elem); + } +} + +static struct sdp_xml_context *sdp_xml_init_context() +{ + struct sdp_xml_context *context; + + context = malloc(sizeof(struct sdp_xml_context)); + + if (!context) + return NULL; + + context->parser = 0; + context->sdprec = 0; + context->stack_head = 0; + + context->parser = XML_ParserCreate(NULL); + XML_SetElementHandler(context->parser, convert_xml_to_sdp_start, + convert_xml_to_sdp_end); + XML_SetUserData(context->parser, context); + + if (!context->parser) + goto fail; + + context->sdprec = sdp_record_alloc(); + + if (!context->sdprec) + goto fail; + + return context; + +fail: + if (context->parser) + free(context->parser); + + if (context->sdprec) + sdp_record_free(context->sdprec); + + if (context) + free(context); + + return NULL; +} + +static void sdp_xml_free_context(struct sdp_xml_context *context) +{ + struct sdp_xml_data *elem; + + /* Free the stack */ + while (context->stack_head) { + elem = context->stack_head; + context->stack_head = elem->next; + sdp_xml_data_free(elem); + } + + XML_ParserFree(context->parser); + + free(context); +} + +static int sdp_xml_parse_chunk(struct sdp_xml_context *context, + const char *data, int size, int final) +{ + if (!XML_Parse(context->parser, data, size, final)) { + error("Parse error at line %d: %s\n", + XML_GetCurrentLineNumber(context->parser), + XML_ErrorString(XML_GetErrorCode(context->parser))); + return -1; + } + + return 0; +} + +sdp_record_t *sdp_xml_parse_record(const char *data, int size) +{ + struct sdp_xml_context *context; + sdp_record_t *record; + + context = sdp_xml_init_context(); + + if (sdp_xml_parse_chunk(context, data, size, 1) < 0) { + sdp_record_free(context->sdprec); + sdp_xml_free_context(context); + return NULL; + } + + record = context->sdprec; + + sdp_xml_free_context(context); + + return record; +} |