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141 lines
3.5 KiB
C
141 lines
3.5 KiB
C
//
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// PDF dictionary functions for PDFio.
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//
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// Copyright © 2021 by Michael R Sweet.
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//
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// Licensed under Apache License v2.0. See the file "LICENSE" for more
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// information.
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//
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//
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// Include necessary headers...
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//
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#include "pdfio-private.h"
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//
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// Local functions...
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//
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static int compare_strings(char **a, char **b);
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//
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// 'pdfioStringCreate()' - Create a durable literal string.
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//
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// This function creates a literal string associated with the PDF file
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// "pdf". The "s" string points to a nul-terminated C string.
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//
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// `NULL` is returned on error, otherwise a `char *` that is valid until
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// `pdfioFileClose` is called.
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//
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char * // O - Durable string pointer or `NULL` on error
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pdfioStringCreate(
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pdfio_file_t *pdf, // I - PDF file
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const char *s) // I - Nul-terminated string
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{
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char *news; // New string
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char **match; // Matching string
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PDFIO_DEBUG("pdfioStringCreate(pdf=%p, s=\"%s\")\n", pdf, s);
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// Range check input...
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if (!pdf || !s)
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return (NULL);
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// See if the string has already been added...
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if (pdf->num_strings > 0 && (match = (char **)bsearch(&s, pdf->strings, pdf->num_strings, sizeof(char *), (int (*)(const void *, const void *))compare_strings)) != NULL)
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return (*match);
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// Not already added, so add it...
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if ((news = strdup(s)) == NULL)
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return (NULL);
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if (pdf->num_strings >= pdf->alloc_strings)
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{
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// Expand the string array...
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char **temp = (char **)realloc(pdf->strings, (pdf->alloc_strings + 128) * sizeof(char *));
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if (!temp)
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{
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free(news);
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return (NULL);
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}
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pdf->strings = temp;
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pdf->alloc_strings += 128;
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}
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// TODO: Change to insertion sort as needed...
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pdf->strings[pdf->num_strings ++] = news;
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if (pdf->num_strings > 1)
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qsort(pdf->strings, pdf->num_strings, sizeof(char *), (int (*)(const void *, const void *))compare_strings);
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PDFIO_DEBUG("pdfioStringCreate: %lu strings\n", (unsigned long)pdf->num_strings);
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return (news);
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}
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//
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// 'pdfioStringCreatef()' - Create a durable formatted string.
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//
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// This function creates a formatted string associated with the PDF file
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// "pdf". The "format" string contains `printf`-style format characters.
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//
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// `NULL` is returned on error, otherwise a `char *` that is valid until
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// `pdfioFileClose` is called.
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//
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char * // O - Durable string pointer or `NULL` on error
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pdfioStringCreatef(
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pdfio_file_t *pdf, // I - PDF file
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const char *format, // I - `printf`-style format string
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...) // I - Additional args as needed
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{
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char buffer[8192]; // String buffer
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va_list ap; // Argument list
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// Range check input...
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if (!pdf || !format)
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return (NULL);
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// Format the string...
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va_start(ap, format);
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vsnprintf(buffer, sizeof(buffer), format, ap);
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va_end(ap);
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// Create the string from the buffer...
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return (pdfioStringCreate(pdf, buffer));
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}
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//
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// '_pdfioStringIsAllocated()' - Check whether a string has been allocated.
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//
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bool // O - `true` if allocated, `false` otherwise
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_pdfioStringIsAllocated(
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pdfio_file_t *pdf, // I - PDF file
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const char *s) // I - String
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{
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return (pdf->num_strings > 0 && bsearch(&s, pdf->strings, pdf->num_strings, sizeof(char *), (int (*)(const void *, const void *))compare_strings) != NULL);
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}
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//
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// 'compare_strings()' - Compare two strings.
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//
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static int // O - Result of comparison
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compare_strings(char **a, // I - First string
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char **b) // I - Second string
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{
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return (strcmp(*a, *b));
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}
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