pdfio/pdfio-dict.c

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//
// PDF dictionary functions for PDFio.
//
// Copyright © 2021-2023 by Michael R Sweet.
//
// Licensed under Apache License v2.0. See the file "LICENSE" for more
// information.
//
//
// Include necessary headers...
//
#include "pdfio-private.h"
//
// Local functions...
//
static int compare_pairs(_pdfio_pair_t *a, _pdfio_pair_t *b);
//
// '_pdfioDictClear()' - Remove a key/value pair from a dictionary.
//
void
_pdfioDictClear(pdfio_dict_t *dict, // I - Dictionary
const char *key) // I - Key
{
size_t idx; // Index into pairs
_pdfio_pair_t *pair, // Current pair
pkey; // Search key
PDFIO_DEBUG("_pdfioDictClear(dict=%p, key=\"%s\")\n", dict, key);
// See if the key is already set...
if (dict->num_pairs > 0)
{
pkey.key = key;
if ((pair = (_pdfio_pair_t *)bsearch(&pkey, dict->pairs, dict->num_pairs, sizeof(_pdfio_pair_t), (int (*)(const void *, const void *))compare_pairs)) != NULL)
{
// Yes, remove it...
if (pair->value.type == PDFIO_VALTYPE_BINARY)
free(pair->value.value.binary.data);
idx = (size_t)(pair - dict->pairs);
dict->num_pairs --;
if (idx < dict->num_pairs)
memmove(pair, pair + 1, (dict->num_pairs - idx) * sizeof(_pdfio_pair_t));
}
}
}
//
// 'pdfioDictCopy()' - Copy a dictionary to a PDF file.
//
pdfio_dict_t * // O - New dictionary
pdfioDictCopy(pdfio_file_t *pdf, // I - PDF file
pdfio_dict_t *dict) // I - Original dictionary
{
pdfio_dict_t *ndict; // New dictionary
size_t i; // Looping var
_pdfio_pair_t *p; // Current source pair
const char *key; // Current destination key
_pdfio_value_t v; // Current destination value
PDFIO_DEBUG("pdfioDictCopy(pdf=%p, dict=%p(%p))\n", pdf, dict, dict ? dict->pdf : NULL);
// Create the new dictionary...
if ((ndict = pdfioDictCreate(pdf)) == NULL)
return (NULL);
// Pre-allocate the pairs array to make this a little faster...
if ((ndict->pairs = (_pdfio_pair_t *)malloc(dict->num_pairs * sizeof(_pdfio_pair_t))) == NULL)
return (NULL); // Let pdfioFileClose do the cleanup...
ndict->alloc_pairs = dict->num_pairs;
// Copy and add each of the source dictionary's key/value pairs...
for (i = dict->num_pairs, p = dict->pairs; i > 0; i --, p ++)
{
if (!strcmp(p->key, "Length") && p->value.type == PDFIO_VALTYPE_INDIRECT && dict->pdf != pdf)
{
// Don't use indirect stream lengths for copied objects...
pdfio_obj_t *lenobj = pdfioFileFindObj(dict->pdf, p->value.value.indirect.number);
// Length object
v.type = PDFIO_VALTYPE_NUMBER;
if (lenobj)
{
if (lenobj->value.type == PDFIO_VALTYPE_NONE)
_pdfioObjLoad(lenobj);
v.value.number = lenobj->value.value.number;
}
else
v.value.number = 0.0;
}
else if (!_pdfioValueCopy(pdf, &v, dict->pdf, &p->value))
return (NULL); // Let pdfioFileClose do the cleanup...
if (_pdfioStringIsAllocated(dict->pdf, p->key))
key = pdfioStringCreate(pdf, p->key);
else
key = p->key;
if (!key)
return (NULL); // Let pdfioFileClose do the cleanup...
// Cannot fail since we already allocated space for the pairs...
_pdfioDictSetValue(ndict, key, &v);
}
// Successfully copied the dictionary, so return it...
return (ndict);
}
//
// 'pdfioDictCreate()' - Create a dictionary to hold key/value pairs.
//
pdfio_dict_t * // O - New dictionary
pdfioDictCreate(pdfio_file_t *pdf) // I - PDF file
{
pdfio_dict_t *dict; // New dictionary
if (!pdf)
return (NULL);
if ((dict = (pdfio_dict_t *)calloc(1, sizeof(pdfio_dict_t))) == NULL)
return (NULL);
dict->pdf = pdf;
if (pdf->num_dicts >= pdf->alloc_dicts)
{
pdfio_dict_t **temp = (pdfio_dict_t **)realloc(pdf->dicts, (pdf->alloc_dicts + 16) * sizeof(pdfio_dict_t *));
if (!temp)
{
free(dict);
return (NULL);
}
pdf->dicts = temp;
pdf->alloc_dicts += 16;
}
pdf->dicts[pdf->num_dicts ++] = dict;
return (dict);
}
//
// '_pdfioDictDebug()' - Dump a dictionary to stderr.
//
void
_pdfioDictDebug(pdfio_dict_t *dict, // I - Dictionary
FILE *fp) // I - Output file
{
size_t i; // Looping var
_pdfio_pair_t *pair; // Current pair
for (i = dict->num_pairs, pair = dict->pairs; i > 0; i --, pair ++)
{
fprintf(fp, "/%s", pair->key);
_pdfioValueDebug(&pair->value, fp);
}
}
//
// '_pdfioDictDelete()' - Free the memory used by a dictionary.
//
void
_pdfioDictDelete(pdfio_dict_t *dict) // I - Dictionary
{
if (dict)
{
size_t i; // Looping var
_pdfio_pair_t *pair; // Current pair
for (i = dict->num_pairs, pair = dict->pairs; i > 0; i --, pair ++)
{
if (pair->value.type == PDFIO_VALTYPE_BINARY)
free(pair->value.value.binary.data);
}
free(dict->pairs);
}
free(dict);
}
//
// 'pdfioDictGetArray()' - Get a key array value from a dictionary.
//
pdfio_array_t * // O - Value
pdfioDictGetArray(pdfio_dict_t *dict, // I - Dictionary
const char *key) // I - Key
{
_pdfio_value_t *value = _pdfioDictGetValue(dict, key);
if (value && value->type == PDFIO_VALTYPE_ARRAY)
return (value->value.array);
else
return (NULL);
}
//
// 'pdfioDictGetBinary()' - Get a key binary string value from a dictionary.
//
unsigned char * // O - Value
pdfioDictGetBinary(pdfio_dict_t *dict, // I - Dictionary
const char *key, // I - Key
size_t *length)// O - Length of value
{
_pdfio_value_t *value = _pdfioDictGetValue(dict, key);
if (!length)
return (NULL);
if (value && value->type == PDFIO_VALTYPE_BINARY)
{
*length = value->value.binary.datalen;
return (value->value.binary.data);
}
else if (value && value->type == PDFIO_VALTYPE_STRING)
{
*length = strlen(value->value.string);
return ((unsigned char *)value->value.string);
}
else
{
*length = 0;
return (NULL);
}
}
//
// 'pdfioDictGetBoolean()' - Get a key boolean value from a dictionary.
//
bool // O - Value
pdfioDictGetBoolean(pdfio_dict_t *dict, // I - Dictionary
const char *key) // I - Key
{
_pdfio_value_t *value = _pdfioDictGetValue(dict, key);
if (value && value->type == PDFIO_VALTYPE_BOOLEAN)
return (value->value.boolean);
else
return (false);
}
//
// 'pdfioDictGetDate()' - Get a date value from a dictionary.
//
time_t // O - Value
pdfioDictGetDate(pdfio_dict_t *dict, // I - Dictionary
const char *key) // I - Key
{
_pdfio_value_t *value = _pdfioDictGetValue(dict, key);
if (value && value->type == PDFIO_VALTYPE_DATE)
return (value->value.date);
else
return (0);
}
//
// 'pdfioDictGetDict()' - Get a key dictionary value from a dictionary.
//
pdfio_dict_t * // O - Value
pdfioDictGetDict(pdfio_dict_t *dict, // I - Dictionary
const char *key) // I - Key
{
_pdfio_value_t *value = _pdfioDictGetValue(dict, key);
if (value && value->type == PDFIO_VALTYPE_DICT)
return (value->value.dict);
else
return (NULL);
}
//
// 'pdfioDictGetName()' - Get a key name value from a dictionary.
//
const char * // O - Value
pdfioDictGetName(pdfio_dict_t *dict, // I - Dictionary
const char *key) // I - Key
{
_pdfio_value_t *value = _pdfioDictGetValue(dict, key);
if (value && value->type == PDFIO_VALTYPE_NAME)
return (value->value.name);
else
return (NULL);
}
//
// 'pdfioDictGetNumber()' - Get a key number value from a dictionary.
//
double // O - Value
pdfioDictGetNumber(pdfio_dict_t *dict, // I - Dictionary
const char *key) // I - Key
{
_pdfio_value_t *value = _pdfioDictGetValue(dict, key);
if (value && value->type == PDFIO_VALTYPE_NUMBER)
return (value->value.number);
else
return (0.0);
}
//
// 'pdfioDictGetObj()' - Get a key indirect object value from a dictionary.
//
pdfio_obj_t * // O - Value
pdfioDictGetObj(pdfio_dict_t *dict, // I - Dictionary
const char *key) // I - Key
{
_pdfio_value_t *value = _pdfioDictGetValue(dict, key);
if (value && value->type == PDFIO_VALTYPE_INDIRECT)
return (pdfioFileFindObj(dict->pdf, value->value.indirect.number));
else
return (NULL);
}
//
// 'pdfioDictGetRect()' - Get a key rectangle value from a dictionary.
//
pdfio_rect_t * // O - Rectangle
pdfioDictGetRect(pdfio_dict_t *dict, // I - Dictionary
const char *key, // I - Key
pdfio_rect_t *rect) // I - Rectangle
{
_pdfio_value_t *value = _pdfioDictGetValue(dict, key);
if (value && value->type == PDFIO_VALTYPE_ARRAY && pdfioArrayGetSize(value->value.array) == 4)
{
rect->x1 = pdfioArrayGetNumber(value->value.array, 0);
rect->y1 = pdfioArrayGetNumber(value->value.array, 1);
rect->x2 = pdfioArrayGetNumber(value->value.array, 2);
rect->y2 = pdfioArrayGetNumber(value->value.array, 3);
return (rect);
}
else
{
memset(rect, 0, sizeof(pdfio_rect_t));
return (NULL);
}
}
//
// 'pdfioDictGetString()' - Get a key string value from a dictionary.
//
const char * // O - Value
pdfioDictGetString(pdfio_dict_t *dict, // I - Dictionary
const char *key) // I - Key
{
_pdfio_value_t *value = _pdfioDictGetValue(dict, key);
if (value && value->type == PDFIO_VALTYPE_STRING)
return (value->value.string);
else
return (NULL);
}
//
// 'pdfioDictGetType()' - Get a key value type from a dictionary.
//
pdfio_valtype_t // O - Value type
pdfioDictGetType(pdfio_dict_t *dict, // I - Dictionary
const char *key) // I - Key
{
_pdfio_value_t *value = _pdfioDictGetValue(dict, key);
return (value ? value->type : PDFIO_VALTYPE_NONE);
}
//
// '_pdfioDictGetValue()' - Get a key value from a dictionary.
//
_pdfio_value_t * // O - Value or `NULL` on error
_pdfioDictGetValue(pdfio_dict_t *dict, // I - Dictionary
const char *key) // I - Key
{
_pdfio_pair_t temp, // Search key
*match; // Matching key pair
PDFIO_DEBUG("_pdfioDictGetValue(dict=%p, key=\"%s\")\n", dict, key);
if (!dict || !dict->num_pairs || !key)
{
PDFIO_DEBUG("_pdfioDictGetValue: Returning NULL.\n");
return (NULL);
}
temp.key = key;
if ((match = bsearch(&temp, dict->pairs, dict->num_pairs, sizeof(_pdfio_pair_t), (int (*)(const void *, const void *))compare_pairs)) != NULL)
{
PDFIO_DEBUG("_pdfioDictGetValue: Match, returning ");
PDFIO_DEBUG_VALUE(&(match->value));
PDFIO_DEBUG(".\n");
return (&(match->value));
}
else
{
PDFIO_DEBUG("_pdfioDictGetValue: No match, returning NULL.\n");
return (NULL);
}
}
//
// 'pdfioDictIterateKeys()' - Iterate the keys in a dictionary.
//
// This function iterates the keys in a dictionary, calling the supplied
// function "cb":
//
// ```
// bool
// my_dict_cb(pdfio_dict_t *dict, const char *key, void *cb_data)
// {
// ... "key" contains the dictionary key ...
// ... return true to continue or false to stop ...
// }
// ```
//
// The iteration continues as long as the callback returns `true` or all keys
// have been iterated.
//
void
pdfioDictIterateKeys(
pdfio_dict_t *dict, // I - Dictionary
pdfio_dict_cb_t cb, // I - Callback function
void *cb_data) // I - Callback data
{
size_t i; // Looping var
_pdfio_pair_t *pair; // Current pair
// Range check input...
if (!dict || !cb)
return;
for (i = dict->num_pairs, pair = dict->pairs; i > 0; i --, pair ++)
{
if (!(cb)(dict, pair->key, cb_data))
break;
}
}
//
// '_pdfioDictRead()' - Read a dictionary from a PDF file.
//
// At this point we've seen the initial "<<"...
//
pdfio_dict_t * // O - New dictionary
_pdfioDictRead(pdfio_file_t *pdf, // I - PDF file
pdfio_obj_t *obj, // I - Object, if any
_pdfio_token_t *tb, // I - Token buffer/stack
size_t depth) // I - Depth of dictionary
{
pdfio_dict_t *dict; // New dictionary
char key[256]; // Dictionary key
_pdfio_value_t value; // Dictionary value
PDFIO_DEBUG("_pdfioDictRead(pdf=%p)\n", pdf);
// Create a dictionary and start reading...
if ((dict = pdfioDictCreate(pdf)) == NULL)
return (NULL);
while (_pdfioTokenGet(tb, key, sizeof(key)))
{
// Get the next key or end-of-dictionary...
if (!strcmp(key, ">>"))
{
// End of dictionary...
return (dict);
}
else if (key[0] != '/')
{
_pdfioFileError(pdf, "Invalid dictionary contents.");
break;
}
else if (_pdfioDictGetValue(dict, key + 1))
{
_pdfioFileError(pdf, "Duplicate dictionary key '%s'.", key + 1);
return (NULL);
}
// Then get the next value...
PDFIO_DEBUG("_pdfioDictRead: Reading value for '%s'.\n", key + 1);
if (!_pdfioValueRead(pdf, obj, tb, &value, depth))
{
_pdfioFileError(pdf, "Missing value for dictionary key.");
break;
}
if (!_pdfioDictSetValue(dict, pdfioStringCreate(pdf, key + 1), &value))
break;
// PDFIO_DEBUG("_pdfioDictRead: Set %s.\n", key);
}
// Dictionary is invalid - pdfioFileClose will free the memory, return NULL
// to indicate an error...
return (NULL);
}
//
// 'pdfioDictSetArray()' - Set a key array in a dictionary.
//
bool // O - `true` on success, `false` on failure
pdfioDictSetArray(pdfio_dict_t *dict, // I - Dictionary
const char *key, // I - Key
pdfio_array_t *value) // I - Value
{
_pdfio_value_t temp; // New value
// Range check input...
if (!dict || !key || !value)
return (false);
// Set the key/value pair...
temp.type = PDFIO_VALTYPE_ARRAY;
temp.value.array = value;
return (_pdfioDictSetValue(dict, key, &temp));
}
//
// 'pdfioDictSetBinary()' - Set a key binary string in a dictionary.
//
bool // O - `true` on success, `false` on failure
pdfioDictSetBinary(
pdfio_dict_t *dict, // I - Dictionary
const char *key, // I - Key
const unsigned char *value, // I - Value
size_t valuelen) // I - Length of value
{
_pdfio_value_t temp; // New value
// Range check input...
if (!dict || !key || !value || !valuelen)
return (false);
// Set the key/value pair...
temp.type = PDFIO_VALTYPE_BINARY;
temp.value.binary.datalen = valuelen;
if ((temp.value.binary.data = (unsigned char *)malloc(valuelen)) == NULL)
return (false);
memcpy(temp.value.binary.data, value, valuelen);
if (!_pdfioDictSetValue(dict, key, &temp))
{
free(temp.value.binary.data);
return (false);
}
return (true);
}
//
// 'pdfioDictSetBoolean()' - Set a key boolean in a dictionary.
//
bool // O - `true` on success, `false` on failure
pdfioDictSetBoolean(pdfio_dict_t *dict, // I - Dictionary
const char *key, // I - Key
bool value) // I - Value
{
_pdfio_value_t temp; // New value
// Range check input...
if (!dict || !key)
return (false);
// Set the key/value pair...
temp.type = PDFIO_VALTYPE_BOOLEAN;
temp.value.boolean = value;
return (_pdfioDictSetValue(dict, key, &temp));
}
//
// 'pdfioDictSetDate()' - Set a date value in a dictionary.
//
bool // O - `true` on success, `false` on failure
pdfioDictSetDate(pdfio_dict_t *dict, // I - Dictionary
const char *key, // I - Key
time_t value) // I - Value
{
_pdfio_value_t temp; // New value
// Range check input...
if (!dict || !key)
return (false);
// Set the key/value pair...
temp.type = PDFIO_VALTYPE_DATE;
temp.value.date = value;
return (_pdfioDictSetValue(dict, key, &temp));
}
//
// 'pdfioDictSetDict()' - Set a key dictionary in a dictionary.
//
bool // O - `true` on success, `false` on failure
pdfioDictSetDict(pdfio_dict_t *dict, // I - Dictionary
const char *key, // I - Key
pdfio_dict_t *value) // I - Value
{
_pdfio_value_t temp; // New value
// Range check input...
if (!dict || !key || !value)
return (false);
// Set the key/value pair...
temp.type = PDFIO_VALTYPE_DICT;
temp.value.dict = value;
return (_pdfioDictSetValue(dict, key, &temp));
}
//
// 'pdfioDictSetName()' - Set a key name in a dictionary.
//
bool // O - `true` on success, `false` on failure
pdfioDictSetName(pdfio_dict_t *dict, // I - Dictionary
const char *key, // I - Key
const char *value) // I - Value
{
_pdfio_value_t temp; // New value
// Range check input...
if (!dict || !key || !value)
return (false);
// Set the key/value pair...
temp.type = PDFIO_VALTYPE_NAME;
temp.value.name = value;
return (_pdfioDictSetValue(dict, key, &temp));
}
//
// 'pdfioDictSetNull()' - Set a key null in a dictionary.
//
bool // O - `true` on success, `false` on failure
pdfioDictSetNull(pdfio_dict_t *dict, // I - Dictionary
const char *key) // I - Key
{
_pdfio_value_t temp; // New value
// Range check input...
if (!dict || !key)
return (false);
// Set the key/value pair...
temp.type = PDFIO_VALTYPE_NULL;
return (_pdfioDictSetValue(dict, key, &temp));
}
//
// 'pdfioDictSetNumber()' - Set a key number in a dictionary.
//
bool // O - `true` on success, `false` on failure
pdfioDictSetNumber(pdfio_dict_t *dict, // I - Dictionary
const char *key, // I - Key
double value) // I - Value
{
_pdfio_value_t temp; // New value
// Range check input...
if (!dict || !key)
return (false);
// Set the key/value pair...
temp.type = PDFIO_VALTYPE_NUMBER;
temp.value.number = value;
return (_pdfioDictSetValue(dict, key, &temp));
}
//
// 'pdfioDictSetObj()' - Set a key indirect object reference in a dictionary.
//
bool // O - `true` on success, `false` on failure
pdfioDictSetObj(pdfio_dict_t *dict, // I - Dictionary
const char *key, // I - Key
pdfio_obj_t *value) // I - Value
{
_pdfio_value_t temp; // New value
// Range check input...
if (!dict || !key || !value)
return (false);
// Set the key/value pair...
temp.type = PDFIO_VALTYPE_INDIRECT;
temp.value.indirect.number = value->number;
temp.value.indirect.generation = value->generation;
return (_pdfioDictSetValue(dict, key, &temp));
}
//
// 'pdfioDictSetRect()' - Set a key rectangle in a dictionary.
//
bool // O - `true` on success, `false` on failure
pdfioDictSetRect(pdfio_dict_t *dict, // I - Dictionary
const char *key, // I - Key
pdfio_rect_t *value) // I - Value
{
_pdfio_value_t temp; // New value
// Range check input...
if (!dict || !key || !value)
return (false);
// Set the key/value pair...
temp.type = PDFIO_VALTYPE_ARRAY;
temp.value.array = pdfioArrayCreate(dict->pdf);
pdfioArrayAppendNumber(temp.value.array, value->x1);
pdfioArrayAppendNumber(temp.value.array, value->y1);
pdfioArrayAppendNumber(temp.value.array, value->x2);
pdfioArrayAppendNumber(temp.value.array, value->y2);
return (_pdfioDictSetValue(dict, key, &temp));
}
//
// 'pdfioDictSetString()' - Set a key literal string in a dictionary.
//
bool // O - `true` on success, `false` on failure
pdfioDictSetString(pdfio_dict_t *dict, // I - Dictionary
const char *key, // I - Key
const char *value)// I - Value
{
_pdfio_value_t temp; // New value
// Range check input...
if (!dict || !key || !value)
return (false);
// Set the key/value pair...
temp.type = PDFIO_VALTYPE_STRING;
temp.value.string = value;
return (_pdfioDictSetValue(dict, key, &temp));
}
//
// 'pdfioDictSetStringf()' - Set a key formatted string in a dictionary.
//
bool // O - `true` on success, `false` on failure
pdfioDictSetStringf(
pdfio_dict_t *dict, // I - Dictionary
const char *key, // I - Key
const char *format, // I - `printf`-style format string
...) // I - Additional arguments as needed
{
char buffer[8192]; // String buffer
va_list ap; // Argument list
// Range check input...
if (!dict || !key || !format)
return (false);
// Set the key/value pair...
va_start(ap, format);
vsnprintf(buffer, sizeof(buffer), format, ap);
va_end(ap);
return (pdfioDictSetString(dict, key, buffer));
}
//
// '_pdfioDictSetValue()' - Set a key value in a dictionary.
//
bool // O - `true` on success, `false` on failure
_pdfioDictSetValue(
pdfio_dict_t *dict, // I - Dictionary
const char *key, // I - Key
_pdfio_value_t *value) // I - Value
{
_pdfio_pair_t *pair; // Current pair
PDFIO_DEBUG("_pdfioDictSetValue(dict=%p, key=\"%s\", value=%p)\n", dict, key, (void *)value);
// See if the key is already set...
if (dict->num_pairs > 0)
{
_pdfio_pair_t pkey; // Search key
pkey.key = key;
if ((pair = (_pdfio_pair_t *)bsearch(&pkey, dict->pairs, dict->num_pairs, sizeof(_pdfio_pair_t), (int (*)(const void *, const void *))compare_pairs)) != NULL)
{
// Yes, replace the value...
PDFIO_DEBUG("_pdfioDictSetValue: Replacing existing value.\n");
if (pair->value.type == PDFIO_VALTYPE_BINARY)
free(pair->value.value.binary.data);
pair->value = *value;
return (true);
}
}
// Nope, add a pair...
if (dict->num_pairs >= dict->alloc_pairs)
{
// Expand the dictionary...
_pdfio_pair_t *temp = (_pdfio_pair_t *)realloc(dict->pairs, (dict->alloc_pairs + 8) * sizeof(_pdfio_pair_t));
if (!temp)
{
PDFIO_DEBUG("_pdfioDictSetValue: Out of memory.\n");
return (false);
}
dict->pairs = temp;
dict->alloc_pairs += 8;
}
pair = dict->pairs + dict->num_pairs;
dict->num_pairs ++;
pair->key = key;
pair->value = *value;
// Re-sort the dictionary and return...
if (dict->num_pairs > 1 && compare_pairs(pair - 1, pair) > 0)
qsort(dict->pairs, dict->num_pairs, sizeof(_pdfio_pair_t), (int (*)(const void *, const void *))compare_pairs);
#ifdef DEBUG
PDFIO_DEBUG("_pdfioDictSetValue(%p): %lu pairs\n", (void *)dict, (unsigned long)dict->num_pairs);
// PDFIO_DEBUG("_pdfioDictSetValue(%p): ", (void *)dict);
// PDFIO_DEBUG_DICT(dict);
// PDFIO_DEBUG("\n");
#endif // DEBUG
return (true);
}
//
// '_pdfioDictWrite()' - Write a dictionary to a PDF file.
//
bool // O - `true` on success, `false` on failure
_pdfioDictWrite(pdfio_dict_t *dict, // I - Dictionary
pdfio_obj_t *obj, // I - Object, if any
off_t *length) // I - Offset to length value
{
pdfio_file_t *pdf = dict->pdf; // PDF file
size_t i; // Looping var
_pdfio_pair_t *pair; // Current key/value pair
if (length)
*length = 0;
// Dictionaries are bounded by "<<" and ">>"...
if (!_pdfioFilePuts(pdf, "<<"))
return (false);
// Write all of the key/value pairs...
for (i = dict->num_pairs, pair = dict->pairs; i > 0; i --, pair ++)
{
if (!_pdfioFilePrintf(pdf, "/%s", pair->key))
return (false);
if (length && !strcmp(pair->key, "Length") && pair->value.type == PDFIO_VALTYPE_NUMBER && pair->value.value.number <= 0.0)
{
// Writing an object dictionary with an undefined length
*length = _pdfioFileTell(pdf) + 1;
if (!_pdfioFilePuts(pdf, " 9999999999"))
return (false);
}
else if (!_pdfioValueWrite(pdf, obj, &pair->value, NULL))
return (false);
}
// Close it up...
return (_pdfioFilePuts(pdf, ">>"));
}
//
// 'compare_pairs()' - Compare the keys for two pairs.
//
static int // O - Result of comparison
compare_pairs(_pdfio_pair_t *a, // I - First pair
_pdfio_pair_t *b) // I - Second pair
{
return (strcmp(a->key, b->key));
}