173 lines
4.9 KiB
C
173 lines
4.9 KiB
C
/* *****************************************************************************
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* utils/buffer.c -- libg1m custom buffers utilities.
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* Copyright (C) 2017 Thomas "Cakeisalie5" Touhey <thomas@touhey.fr>
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*
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* This file is part of libg1m.
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* libg1m is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 3.0 of the License,
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* or (at your option) any later version.
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*
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* libg1m is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with libg1m; if not, see <http://www.gnu.org/licenses/>.
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* ************************************************************************** */
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#include <libg1m/internals.h>
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#ifndef G1M_DISABLED_FILE
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/* ************************************************************************** */
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/* FILE buffer */
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/* ************************************************************************** */
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/**
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* g1m_filebuffer_read:
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* Read from a filebuffer.
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*
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* @arg vcookie the FILE* (uncasted)
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* @arg buf the buffer to fill.
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* @arg size the size to read.
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* @return the error (if any).
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*/
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int g1m_filebuffer_read(void *vcookie, unsigned char *buf, size_t size)
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{
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FILE *file = (void*)vcookie;
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# if LOGLEVEL <= ll_error
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size_t orig = size;
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# endif
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while (size) {
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size_t read = fread(buf, 1, size, file);
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size -= read;
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if (!read || read == (size_t)-1) {
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log_error("READING failed: read %" PRIuSIZE "/%" PRIuSIZE
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" bytes, %" PRIuSIZE " missing.", orig - size, orig, size);
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return (feof(file) ? g1m_error_eof : g1m_error_read);
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}
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}
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/* no error */
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return (0);
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}
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/**
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* g1m_filebuffer_write:
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* Write to a filebuffer.
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*
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* @arg vcookie the FILE* (uncasted)
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* @arg buf the buffer to write.
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* @arg size the size to write.
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* @return the error (if any).
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*/
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int g1m_filebuffer_write(void *vcookie, const unsigned char *buf, size_t size)
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{
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FILE *file = (void*)vcookie;
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# if LOGLEVEL <= ll_error
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size_t orig = size;
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# endif
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while (size) {
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size_t written = fwrite(buf, 1, size, file);
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buf += written;
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size -= written;
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if (!written) {
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log_error("WRITING failed: wrote %" PRIuSIZE "/%" PRIuSIZE
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" bytes, %" PRIuSIZE " missing.", orig - size, orig, size);
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return (g1m_error_write);
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}
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}
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/* no error! */
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return (0);
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}
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#endif
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/* ************************************************************************** */
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/* Memory buffer */
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/* ************************************************************************** */
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/**
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* g1m_membuffer_read:
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* Read from a memory buffer.
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*
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* @arg vcookie the cursor (uncasted)
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* @arg dest the destination buffer.
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* @arg size the size to read.
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* @return the error, if any.
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*/
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int g1m_membuffer_read(void *vcookie, unsigned char *dest, size_t size)
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{
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g1m_cursor_t *cursor = (void*)vcookie;
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if (size > cursor->g1m_cursor_left)
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return (g1m_error_eof);
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memcpy(dest, cursor->g1m_cursor_p, size);
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cursor->g1m_cursor_p += size;
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return (0);
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}
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/* ************************************************************************** */
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/* Limited buffer */
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/* ************************************************************************** */
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/**
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* g1m_limbuffer_read:
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* Read from a filebuffer.
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*
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* @arg vcookie the FILE* (uncasted)
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* @arg buf the buffer to fill.
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* @arg size the size to read.
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* @return the error (if any).
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*/
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int g1m_limbuffer_read(void *vcookie, unsigned char *buf, size_t size)
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{
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/* check if the size is okay */
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g1m_limited_t *lim = (void*)vcookie;
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if (size > lim->g1m_limited_left) return (g1m_error_eof);
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g1m_buffer_t *buffer = lim->g1m_limited_buffer;
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/* read */
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READ(buf, size)
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/* no error */
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return (0);
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}
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/**
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* g1m_empty_limbuffer:
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* Empty the limit buffer.
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*
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* @arg limbuf the limbuffer.
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*/
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int g1m_empty_limbuffer(g1m_buffer_t *limbuffer)
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{
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g1m_limited_t *lim = (void*)limbuffer->g1m_buffer_cookie;
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g1m_buffer_t *buffer = lim->g1m_limited_buffer;
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SKIP(lim->g1m_limited_left)
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return (0);
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}
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/* ************************************************************************** */
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/* The announce callback */
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/* ************************************************************************** */
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/**
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* g1m_announce_callback:
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* Main announce callback, that just contributes to a size.
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*
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* @arg vpsize the size_t pointer.
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* @arg size the size to add.
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* @return 0 because OK.
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*/
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int g1m_announce_callback(void *vpsize, size_t size)
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{
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size_t *psize = (void*)vpsize;
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*psize += size;
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return (0);
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}
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