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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,100 @@ | ||
| // Copyright (C) 2023 Artifex Software, Inc. | ||
| // | ||
| // This file is part of MuPDF. | ||
| // | ||
| // MuPDF is free software: you can redistribute it and/or modify it under the | ||
| // terms of the GNU Affero General Public License as published by the Free | ||
| // Software Foundation, either version 3 of the License, or (at your option) | ||
| // any later version. | ||
| // | ||
| // MuPDF 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 Affero General Public License for more | ||
| // details. | ||
| // | ||
| // You should have received a copy of the GNU Affero General Public License | ||
| // along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html> | ||
| // | ||
| // Alternative licensing terms are available from the licensor. | ||
| // For commercial licensing, see <https://www.artifex.com/> or contact | ||
| // Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco, | ||
| // CA 94129, USA, for further information. | ||
|
|
||
| #include "mupdf/fitz.h" | ||
|
|
||
| #ifndef MAX_WBITS | ||
| # define MAX_WBITS 15 /* 32K LZ77 window */ | ||
| #endif | ||
|
|
||
| static fz_document * | ||
| gz_open_document_with_stream(fz_context *ctx, fz_stream *ostm) | ||
| { | ||
| fz_stream *stm = fz_open_flated(ctx, ostm, 16 + MAX_WBITS); | ||
| fz_buffer *buf = NULL; | ||
| fz_document *doc = NULL; | ||
|
|
||
| fz_var(buf); | ||
| fz_var(doc); | ||
|
|
||
| fz_try(ctx) | ||
| { | ||
| buf = fz_read_all(ctx, stm, 1024); | ||
| /* No way to pass the magic onwards :( */ | ||
| doc = fz_open_document_with_buffer(ctx, "application/octet-stream", buf); | ||
| } | ||
| fz_always(ctx) | ||
| { | ||
| fz_drop_stream(ctx, stm); | ||
| fz_drop_buffer(ctx, buf); | ||
| } | ||
| fz_catch(ctx) | ||
| fz_rethrow(ctx); | ||
|
|
||
| return doc; | ||
| } | ||
|
|
||
| static const char *gz_extensions[] = | ||
| { | ||
| "gz", | ||
| NULL | ||
| }; | ||
|
|
||
| static const char *gz_mimetypes[] = | ||
| { | ||
| "application/x-gzip-compressed", | ||
| NULL | ||
| }; | ||
|
|
||
| static int | ||
| gz_recognize_doc_content(fz_context *ctx, fz_stream *stream) | ||
| { | ||
| int ret = 0; | ||
| uint8_t data[10]; | ||
|
|
||
| fz_try(ctx) | ||
| { | ||
| fz_seek(ctx, stream, 0, SEEK_SET); | ||
| /* 10 byte header */ | ||
| if (fz_read(ctx, stream, data, 10) != 10) | ||
| break; | ||
| /* We only actually check the first 3 bytes though. */ | ||
| if (data[0] == 0x1f && data[1] == 0x8b && data[2] == 0x08) | ||
| ret = 100; | ||
| } | ||
| fz_catch(ctx) | ||
| fz_rethrow(ctx); | ||
|
|
||
| return ret; | ||
| } | ||
|
|
||
| fz_document_handler gz_document_handler = | ||
| { | ||
| NULL, | ||
| NULL, | ||
| gz_open_document_with_stream, | ||
| gz_extensions, | ||
| gz_mimetypes, | ||
| NULL, /* open_accel */ | ||
| NULL, /* open_accel with stream */ | ||
| gz_recognize_doc_content | ||
| }; |