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220 lines
9.9 KiB
C
220 lines
9.9 KiB
C
/* -*- Mode: C; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is WOFF font packaging code.
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*
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* The Initial Developer of the Original Code is Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2009
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Jonathan Kew <jfkthame@gmail.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef WOFF_H_
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#define WOFF_H_
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/* API for the WOFF encoder and decoder */
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#include "mozilla/StdInt.h"
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#include <stdio.h> /* only for FILE, needed for woffPrintStatus */
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/* error codes returned in the status parameter of WOFF functions */
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enum {
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/* Success */
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eWOFF_ok = 0,
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/* Errors: no valid result returned */
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eWOFF_out_of_memory = 1, /* malloc or realloc failed */
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eWOFF_invalid = 2, /* invalid input file (e.g., bad offset) */
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eWOFF_compression_failure = 3, /* error in zlib call */
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eWOFF_bad_signature = 4, /* unrecognized file signature */
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eWOFF_buffer_too_small = 5, /* the provided buffer is too small */
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eWOFF_bad_parameter = 6, /* bad parameter (e.g., null source ptr) */
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eWOFF_illegal_order = 7, /* improperly ordered chunks in WOFF font */
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/* Warnings: call succeeded but something odd was noticed.
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Multiple warnings may be OR'd together. */
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eWOFF_warn_unknown_version = 0x0100, /* unrecognized version of sfnt,
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not standard TrueType or CFF */
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eWOFF_warn_checksum_mismatch = 0x0200, /* bad checksum, use with caution;
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any DSIG will be invalid */
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eWOFF_warn_misaligned_table = 0x0400, /* table not long-aligned; fixing,
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but DSIG will be invalid */
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eWOFF_warn_trailing_data = 0x0800, /* trailing junk discarded,
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any DSIG may be invalid */
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eWOFF_warn_unpadded_table = 0x1000, /* sfnt not correctly padded,
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any DSIG may be invalid */
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eWOFF_warn_removed_DSIG = 0x2000, /* removed digital signature
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while fixing checksum errors */
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eWOFF_warn_no_such_table = 0x4000 /* specified table not present */
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};
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/* Note: status parameters must be initialized to eWOFF_ok before calling
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WOFF functions. If the status parameter contains an error code,
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functions will return immediately. */
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#define WOFF_SUCCESS(status) (((uint32_t)(status) & 0xff) == eWOFF_ok)
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#define WOFF_FAILURE(status) (!WOFF_SUCCESS(status))
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#define WOFF_WARNING(status) ((uint32_t)(status) & ~0xff)
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef WOFF_DISABLE_ENCODING
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/*****************************************************************************
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* Returns a new malloc() block containing the encoded data, or NULL on error;
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* caller should free() this when finished with it.
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* Returns length of the encoded data in woffLen.
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* The new WOFF has no metadata or private block;
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* see the following functions to update these elements.
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*/
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const uint8_t * woffEncode(const uint8_t * sfntData, uint32_t sfntLen,
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uint16_t majorVersion, uint16_t minorVersion,
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uint32_t * woffLen, uint32_t * status);
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/*****************************************************************************
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* Add the given metadata block to the WOFF font, replacing any existing
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* metadata block. The block will be zlib-compressed.
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* Metadata is required to be valid XML (use of UTF-8 is recommended),
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* though this function does not currently check this.
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* The woffData pointer must be a malloc() block (typically from woffEncode);
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* it will be freed by this function and a new malloc() block will be returned.
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* Returns NULL if an error occurs, in which case the original WOFF is NOT freed.
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*/
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const uint8_t * woffSetMetadata(const uint8_t * woffData, uint32_t * woffLen,
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const uint8_t * metaData, uint32_t metaLen,
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uint32_t * status);
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/*****************************************************************************
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* Add the given private data block to the WOFF font, replacing any existing
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* private block. The block will NOT be zlib-compressed.
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* Private data may be any arbitrary block of bytes; it may be externally
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* compressed by the client if desired.
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* The woffData pointer must be a malloc() block (typically from woffEncode);
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* it will be freed by this function and a new malloc() block will be returned.
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* Returns NULL if an error occurs, in which case the original WOFF is NOT freed.
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*/
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const uint8_t * woffSetPrivateData(const uint8_t * woffData, uint32_t * woffLen,
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const uint8_t * privData, uint32_t privLen,
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uint32_t * status);
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#endif /* WOFF_DISABLE_ENCODING */
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/*****************************************************************************
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* Returns the size of buffer needed to decode the font (or zero on error).
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*/
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uint32_t woffGetDecodedSize(const uint8_t * woffData, uint32_t woffLen,
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uint32_t * pStatus);
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/*****************************************************************************
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* Decodes WOFF font to a caller-supplied buffer of size bufferLen.
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* Returns the actual size of the decoded sfnt data in pActualSfntLen
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* (must be <= bufferLen, otherwise an error will be returned).
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*/
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void woffDecodeToBuffer(const uint8_t * woffData, uint32_t woffLen,
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uint8_t * sfntData, uint32_t bufferLen,
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uint32_t * pActualSfntLen, uint32_t * pStatus);
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/*****************************************************************************
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* Returns a new malloc() block containing the decoded data, or NULL on error;
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* caller should free() this when finished with it.
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* Returns length of the decoded data in sfntLen.
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*/
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const uint8_t * woffDecode(const uint8_t * woffData, uint32_t woffLen,
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uint32_t * sfntLen, uint32_t * status);
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/*****************************************************************************
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* Returns the size of buffer needed for a specific table (or zero on error).
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*/
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uint32_t woffGetTableSize(const uint8_t * woffData, uint32_t woffLen,
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uint32_t tag, uint32_t * pStatus);
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/*****************************************************************************
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* Gets a table from a WOFF font to a caller-supplied buffer of size bufferLen.
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* Returns the actual size of the decoded table in pTableLen
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* (must be <= bufferLen, otherwise an error will be returned).
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*/
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void woffGetTableToBuffer(const uint8_t * woffData, uint32_t woffLen,
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uint32_t tag, uint8_t * buffer, uint32_t bufferLen,
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uint32_t * pTableLen, uint32_t * pStatus);
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/*****************************************************************************
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* Returns a new malloc() block containing the metadata from the WOFF font,
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* or NULL if an error occurs or no metadata is present.
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* Length of the metadata is returned in metaLen.
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* The metadata is decompressed before returning.
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*/
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const uint8_t * woffGetMetadata(const uint8_t * woffData, uint32_t woffLen,
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uint32_t * metaLen, uint32_t * status);
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/*****************************************************************************
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* Returns a new malloc() block containing the private data from the WOFF font,
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* or NULL if an error occurs or no private data is present.
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* Length of the private data is returned in privLen.
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*/
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const uint8_t * woffGetPrivateData(const uint8_t * woffData, uint32_t woffLen,
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uint32_t * privLen, uint32_t * status);
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/*****************************************************************************
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* Returns the font version numbers from the WOFF font in the major and minor
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* parameters.
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* Check the status result to know if the function succeeded.
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*/
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void woffGetFontVersion(const uint8_t * woffData, uint32_t woffLen,
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uint16_t * major, uint16_t * minor,
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uint32_t * status);
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/*****************************************************************************
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* Utility to print warning and/or error status to the specified FILE*.
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* The prefix string will be prepended to each line (ok to pass NULL if no
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* prefix is wanted).
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* (Provides terse English messages only, not intended for end-user display;
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* user-friendly tools should map the status codes to their own messages.)
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*/
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void woffPrintStatus(FILE * f, uint32_t status, const char * prefix);
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#ifdef __cplusplus
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}
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#endif
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#endif
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