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108 lines
3.0 KiB
108 lines
3.0 KiB
6 years ago
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/*
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Copyright 2011-2017 David Robillard <http://drobilla.net>
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "serd_internal.h"
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static inline SerdStatus
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serd_byte_source_page(SerdByteSource* source)
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{
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source->read_head = 0;
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size_t n_read = source->read_func(
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source->file_buf, 1, SERD_PAGE_SIZE, source->stream);
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if (n_read == 0) {
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source->file_buf[0] = '\0';
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return (source->error_func(source->stream)
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? SERD_ERR_UNKNOWN : SERD_FAILURE);
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} else if (n_read < SERD_PAGE_SIZE) {
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source->file_buf[n_read] = '\0';
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}
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return SERD_SUCCESS;
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}
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SerdStatus
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serd_byte_source_open_source(SerdByteSource* source,
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SerdSource read_func,
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SerdStreamErrorFunc error_func,
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void* stream,
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bool bulk)
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{
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memset(source, '\0', sizeof(*source));
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source->stream = stream;
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source->from_stream = true;
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source->paging = bulk;
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source->error_func = error_func;
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source->read_func = read_func;
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if (bulk) {
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source->file_buf = (uint8_t*)serd_bufalloc(SERD_PAGE_SIZE);
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source->read_buf = source->file_buf;
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memset(source->file_buf, '\0', SERD_PAGE_SIZE);
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} else {
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source->read_buf = &source->read_byte;
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}
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return SERD_SUCCESS;
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}
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SerdStatus
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serd_byte_source_prepare(SerdByteSource* source)
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{
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if (!source->prepared) {
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source->prepared = true;
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if (source->paging) {
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return serd_byte_source_page(source);
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} else if (source->from_stream) {
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return serd_byte_source_advance(source);
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}
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}
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return SERD_SUCCESS;
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}
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SerdStatus
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serd_byte_source_open_string(SerdByteSource* source, const uint8_t* utf8)
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{
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memset(source, '\0', sizeof(*source));
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source->read_buf = utf8;
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source->prepared = true;
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return SERD_SUCCESS;
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}
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SerdStatus
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serd_byte_source_close(SerdByteSource* source)
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{
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if (source->paging) {
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free(source->file_buf);
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}
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memset(source, '\0', sizeof(*source));
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return SERD_SUCCESS;
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}
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SerdStatus
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serd_byte_source_advance(SerdByteSource* source)
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{
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SerdStatus st = SERD_SUCCESS;
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if (source->from_stream && !source->paging) {
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if (source->read_func(&source->read_byte, 1, 1, source->stream) == 0) {
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return (source->error_func(source->stream)
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? SERD_ERR_UNKNOWN : SERD_FAILURE);
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}
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} else if (++source->read_head == SERD_PAGE_SIZE && source->paging) {
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st = serd_byte_source_page(source);
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}
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return st;
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}
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